Q517 - Electrical, Electronic, & Control Engineering, USCG prep certification 2026

Progress: 24% (23/94)

Learning progress ?

1. An electric propulsion drive system in which the propulsion generator only supplies power to the propulsion motor is referred to as what type of system?Not learned 2. As shown in the illustrated adaptive digital steering control system functional block diagram and listed system interface signals table, what would the rudder order signal output voltage to the rudder servo amplifier be for a rudder order of 20 degrees left rudder, assuming left rudder signals are negative and right order signals are positive in polarityNot learned 3. As shown in the illustrated adaptive digital steering control system functional block diagram and listed system interface signals table, what would the rudder order signal output voltage to the rudder servo amplifier be for a rudder order of 15 degrees right rudder, assuming left rudder signals are negative and right order signals are positive in polarityNot learned 4. As shown in the illustrated digital gyrocompass functional block diagram and the associated communication protocols table, what would the rate of turn signal voltage be if the rate of turn is 30 degrees per minute to port? Assume that the rate of turn to port signal voltage is negative in polarity and that the rate of turn to starboard signal voltage is positive in polarityNot learned 5. What damage may occur to the components of a winch master control switch, if the cover gasket becomes deteriorated?Not learned 6. Before any work on electrical or electronic equipment is performed, which of the following precautions should be carried out?Not learned 7. In a 60 Hz AC system, what is the duration in seconds for one complete cycle?Not learned 8. What is meant by the term 'dielectric'?Not learned 9. Before working on an electric cargo winch master switch or controller, what should be done?Not learned 10. Before work may safely commence on a high voltage system, what must first be done after disconnection and isolation?Not learned 11. In order for a live-line tester to be used to test and prove dead a high voltage circuit, what must be done to verify the ability of the tester to detect a voltage?Not learned 12. Which activity or event accounts for the most electrical accidents resulting in injury?Not learned 13. Why should an electrical worker determine the nominal voltage of a circuit first before making contact with the circuit?Not learned 14. When taking voltage measurements, for reasons of electrical safety, what should be the proper sequence of actions?Not learned 15. When performing an absence-of-voltage test before commencing repair work, at the minimum where must the absence-of-voltage test be performed?Not learned 16. When performing an absence-of-voltage test, a live-dead-live test may be required in conjunction with the absence-of-voltage test. What is the purpose of the live-dead-live test?Not learned 17. What statement is true concerning temporary protective grounds used to establish an equipotential zone for the purposes of eliminating the electric shock hazard?Not learned 18. What is the minimum threshold voltage which requires electrical workers to be insulated from energized conductors or circuit parts by wearing the appropriate PPE while working in open enclosures?Not learned 19. Which of the electrical schematic symbols shown in the illustration represents a normally closed limit switchNot learned 20. What will happen to a carbon resistor operating in electrical equipment that is NOT properly cooled?Not learned 21. Which of the following conditions would most likely lead to the failure of a resistor due to overheating?Not learned 22. If you disconnect and arrange both ends of a conductor of a multi-conductor cable without any contact between the individual conductors, what would a low ohmic value between the ends of a single conductor indicate?Not learned 23. When electrical cables penetrate watertight bulkheads, what must be provided for?Not learned 24. What is the reason that some electric cables are formed of stranded wire?Not learned 25. Why are large cable sizes often formed as individual conductors comprised of several smaller strands?Not learned 26. How are the line losses in a distribution circuit kept to a minimum?Not learned 27. How should the shunt used in an ammeter be connected?Not learned 28. Why are external shunts sometimes used with ammeters?Not learned 29. What is the instrument called a galvanometer used to measure?Not learned 30. To limit the current flow through a DC voltmeter to as low a value as possible, what is the moving coil circuit provided with?Not learned 31. Which of the listed statements is correct when using a digital multimeter set up as an ohmmeter?Not learned 32. Prior to using an analog multimeter set up as an ohmmeter, the leads are purposely shorted together. Which of the following actions should be taken if, when adjusting to "zero" ohms, the indicating needle cannot be returned to "zero" on the scale?Not learned 33. A resistance in a circuit of unknown value is to be tested using the voltmeter/ammeter method. How should the two meters be connected?Not learned 34. What can a typical common analog or digital multimeter be used to measure?Not learned 35. Under what circumstance would a hand-held portable phase sequence indicator be used should the main switchboard mounted fixed phase sequence indicator be inoperative?Not learned 36. The clamp-on AC ammeter consists essentially of a split-core and a rectifier-type instrument connected to the secondary winding of a particular type of transformer. Which type is used?Not learned 37. To properly use a clamp-on type ammeter to check current flow, what must be done FIRST?Not learned 38. Which of the listed temperature measuring devices installed on a large turbo-electric alternating current propulsion generator would be the most reliable for monitoring generator temperatures to avoid premature winding insulation failure?Not learned 39. What will be the freezing point of the electrolyte in a fully charged lead-acid battery as compared to a discharged battery?Not learned 40. How can the charge of a lead-acid battery be restored?Not learned 41. Which of the problems listed will occur if a lead-acid battery is allowed to remain in a discharged condition for a long period of time?Not learned 42. What condition associated with a lead-acid battery cell can cause the plates to partially short-out and cause the cell to fail to hold a charge?Not learned 43. Which of the listed ranges represents the specific gravity for the electrolyte of a fully charged lead-acid battery at room temperature?Not learned 44. What should you be aware of when checking the specific gravity of the battery electrolyte with a hydrometer?Not learned 45. For accuracy purposes, which of the following devices should be used to measure the temperature of a battery electrolyte?Not learned 46. What can insufficient brush pressure on a DC motor cause?Not learned 47. What type of motor is generally used in DC propulsion drive systems?Not learned 48. How is reversal of a DC propulsion motor achieved?Not learned 49. In addition to improper brush pressure or seating, what can result in excessive sparking at the brushes of a DC propulsion motor?Not learned 50. The apparent power supplied to a motor is six kilovolt amps at 120 volts. What is the impedance of the motor?Not learned 51. An electrical component is connected across a 120-volt 60 hertz AC supply. What is the current drawn by the component if the impedance is 200 ohms?Not learned 52. A three-phase alternator is operating at 450 volts with the switchboard ammeter indicating 300 amps. The kW meter currently indicates 163.6 kW, with a power factor of 0.7. If the power factor increases to 0.8, how much would the kW meter reading increase by?Not learned 53. While standing an "at sea watch" onboard an AC diesel-electric drive ship with a synchronous propulsion motor, you notice that the kwatt load is at roughly 75% of capacity with a leading power factor less than 1. Ideally what would be the character of the power factor associated with the main power distribution including all motors?Not learned 54. The design Power Factor (PF) of a vessel's electrical system is generally 0.8 - 0.9. The system's greatest load is inductive. One notices a slow, gradual decrease, over time, in the PF, from normal/design. What can one do on board to maintain the normal, design PF and thus maintain electrical system's efficiency?Not learned 55. What is the maximum current allowed to be drawn from the secondary of a 2 kVA step-down transformer with a turns ratio of four to one if connected across a 440 volt line?Not learned 56. What are the operating characteristics of a step-down potential transformer in terms of the secondary load?Not learned 57. When a transformer is used to step down voltage, what statement is true?Not learned 58. Which of the listed transformers uses a single winding to produce voltage transformation?Not learned 59. What is the basic principle of operation by which a transformer works?Not learned 60. Why are transformer cores laminated?Not learned 61. Propulsion AC generators creating 4160 VAC use transformers to provide nominally 120 VAC to the automatic voltage regulator. What is the turns ratio of this step-down transformer?Not learned 62. A 440/110 V single phase transformer supplies a load of 5 kW at 0.8 power factor load. What will be its primary current?Not learned 63. A 440/110 V single phase transformer supplies a load of 5 kW at 0.8 power factor load. What will be its secondary current ignoring transformer power losses?Not learned 64. In a three-phase, wye-wye connected transformer, what is the relationship between line current and phase current?Not learned 65. A turbo-generator has a rated output of 1200 kW at 60 Hertz, with a no load frequency of 61.5 Hertz. What is its speed droop?Not learned 66. An AC generator produces 60 Hz at 1800 RPM. If the generator speed is increased to 1830 RPM, what will happen to the frequency in Hz?Not learned 67. If it becomes absolutely necessary to run an alternator at lower than 5% below its rated frequency, in terms of output voltage, what must be done?Not learned 68. Under unusual circumstances, it may be required to operate a ship's service generator above its rated kVA. What supplemental casualty control action will be required?Not learned 69. When a self-excited alternator's field has lost its residual magnetism due to a prolonged idle period, it will fail to produce a voltage. Flashing the field is the procedure used to restore the residual magnetism. Using a 12 volt storage battery, how is this performed?Not learned 70. Two AC generators of the same capacity are operating in parallel. One with a zero-speed droop setting and the other with a 5% speed droop. If its capacity is not exceeded, what will be the characteristic of the unit whose governor has the zero-speed droop setting?Not learned 71. Upon loss of field excitation of a generator operating in parallel with others, what must be done?Not learned 72. By what means is the rotation of a three-phase induction motor reversed?Not learned 73. Which of the following statements is true concerning a large polyphase synchronous main propulsion motor as used in an electric propulsion drive system?Not learned 74. Which of the following problems will most likely occur if the starting winding of a split-phase induction motor failed to cutout once the motor approached operating speed?Not learned 75. What would be the most likely fault if a single-phase permanent split capacitor induction motor fails to start?Not learned 76. What would happen if the centrifugal switch or relay, for cutting out the starting winding of a split-phase induction motor, failed to open while the motor was in operation?Not learned 77. As shown in the illustrated devices and symbols, which of the symbols represents a standard normally open relay contactNot learned 78. What is the function of a shading coil as used in an AC magnetic controller?Not learned 79. How are fuses usually rated?Not learned 80. Due to the operating characteristics of the system, time lag fuses (or dual-element fuses) are necessary for use in what types of circuits?Not learned 81. Fuses are sometimes placed in series with a thermal trip-type circuit breaker. What is the purpose of a fuse used in this arrangement?Not learned 82. To check the three line fuses protecting a three-phase motor using a multimeter set up as a voltmeter, what should be done FIRST?Not learned 83. To test fuses in an energized circuit, what testing apparatus or meter should be used?Not learned 84. In addition to short circuits and sustained overloads, in what other situation are fuses likely to blow?Not learned 85. When replacing a fuse with one of a ampere higher rating than the original, which of the following is true?Not learned 86. By what means does a molded-case circuit breaker provide protection against short circuits?Not learned 87. When the operating handle of a molded-case circuit breaker is in the mid-position, what does this indicate?Not learned 88. Why is it necessary to perform periodic testing of correctly rated and properly installed circuit breakers?Not learned 89. What should be done when performing maintenance of circuit breaker contacts?Not learned 90. In figure "1" of the illustration, what type of circuit breaker trip element is featuredNot learned 91. A three-phase, induction-type motor experiences an open in one phase. Which of the listed automatic protective devices will prevent the motor from being damaged?Not learned 92. Which of the following statements is true concerning the manual motor starter diagram shown in figure "A" of the illustrationNot learned 93. With what kind of starting equipment are most three-phase induction motors of five horsepower or less started?Not learned 94. As shown in the illustrated three-phase squirrel cage induction motor controller, what type of reduced voltage starter is usedNot learned 95. Why are motor controllers seldom troubled by grounds?Not learned 96. What is the function of the autotransformers used with autotransformer starters used on some large AC motors?Not learned 97. Which of the following illustrated circuit schematics provides phase failure protection for a three phase motor using load side voltage sensing technologyNot learned 98. After a black out onboard and once ships power has been restored, the engine room supply fans must be started manually. What characteristic of the electrical circuit for the supply fans cause this requirement?Not learned 99. The ground indicating light on the main electrical switchboard is indicating a ground. What is the best procedure for locating the grounded circuit?Not learned 100. Which of the listed classes of electrical insulation is suited for the highest operating temperature?Not learned 101. Which of the following statements represents the reading display of a hand-cranked megohmmeter when testing a capacitor start motor start capacitor in good condition that has been properly discharged prior to the test?Not learned 102. Suppose it is desired to determine the integrity of the insulation of a 4160 VAC motor. What type of insulation resistance tester (megger) would be suitable?Not learned 103. For a motor rated at 3.3 kV, what would be a minimum accepted insulation resistance to hull ground as tested by an appropriate megger (insulation tester)?Not learned 104. You direct the electrician to take quarterly insulation resistance reading of the ship's critical motors. What additional directions would you give to ensure accurate readings are taken that will allow for the logical comparison of prior and current readings?Not learned 105. When a high voltage system insulation test value is suspect or recorded during an annual survey, a polarization index test is performed. What is the polarization index?Not learned 106. What is a bus disconnect link used to isolate?Not learned 107. Upon failure of the normal power supply, by what means is the emergency generator placed on the line and connected to the emergency bus?Not learned 108. Which of the listed sections of an emergency switchboard is used to supply power for alarm signals under emergency conditions?Not learned 109. What is the most common and reliable type of circuit breaker used for high voltage practice aboard ship?Not learned 110. Some shipboard high voltage systems have the neutral point of the generators bonded to the ship's hull with a neutral grounding resistor. What is the purpose of this resistor?Not learned 111. In addition to high voltage circuit grounding with ground-connecting switching devices, for additional operator safety and confidence, portable grounding straps may be used. What is the proper procedure for connecting these portable grounding straps?Not learned 112. When completing repairs on a high voltage circuit where portable grounding straps were used for increased operator safety and confidence, what is the proper procedure for disconnecting these grounding straps?Not learned 113. What should be performed as routine maintenance of lead acid batteries?Not learned 114. Which of the following procedures should be used to maintain a large electric motor during periods of inactivity?Not learned 115. Which of the following statements is true concerning the cleaning of electrical contacts?Not learned 116. By what means should motor controller contacts be routinely cleaned?Not learned 117. What item (or items) constitute routine AC motor controller maintenance?Not learned 118. What is the greatest single cause of electrical failures?Not learned 119. If the contacts of a motor starter or controller fail to drop out when the 'stop' button is depressed, what could be the cause?Not learned 120. When troubleshooting motor controllers, what is a shorted relay or contactor coil often indicated by?Not learned 121. As shown in figure "A" of the illustration, if in troubleshooting the control circuit using on-line techniques with a voltmeter with the start button depressed and the following readings are taken, what is the problem? "X1" to "X2" reads 115 VAC; "1" to "X2" reads 115 VAC; "2" to "X2" reads 115 VAC; and "3" to "X2" reads 0 VACNot learned 122. If you hear a loud buzzing noise coming from a magnetic motor controller, what should you do?Not learned 123. As a general rule, what is the first troubleshooting action to be taken in checking inoperative electric circuits?Not learned 124. As shown in figure "A" and "B" of the illustration, the potable water pump is short-cycling by the action of the pressure switch as a result of an unusually high level in the potable water hydro- pneumatic header tank. What is most likely the causeNot learned 125. When testing the rotor of a synchronous motor for short circuits, a low voltage source is applied across the rotor coils through the collector rings. What would be the indication of a short-circuited coil?Not learned 126. An open in the armature of a DC motor is suspected, but is not found by visual inspection of the commutator. What would be the next step in troubleshooting this problem?Not learned 127. How is a short in the shunt field of a DC motor best located?Not learned 128. Which of the listed conditions might contribute to very rapid wearing of a DC machine's commutator bars?Not learned 129. If a digital multimeter is set up as shown in figure "A" of the illustration, what would be displayed on the screen if the fuse being tested is not blown and has proper continuityNot learned 130. If a digital multimeter is set up as shown in figure "A" of the illustration to test a capacitor, what would the display read if the capacitor is shortedNot learned 131. What is the name of the device shown in figure "2" of the illustrationNot learned 132. How may temporary repairs to an open DC propulsion armature coil be made, allowing continued operation until permanent repairs can be made?Not learned 133. Besides a condition of overload, what could be a cause of an open armature connection in a DC propulsion motor?Not learned 134. Which of the following statements is true concerning the operation of modern marine electric drive DC propulsion motors?Not learned 135. On DC diesel-electric drives, how is the speed of the DC propulsion motor primarily controlled?Not learned 136. In a diesel-electric plant, raising the generator's field excitation current will have what effect on the DC propulsion motor speed?Not learned 137. While standing an "at sea watch" onboard a modern rectified DC diesel-electric drive ship you notice the transformer core temperature slowly rising. What should be your FIRST action?Not learned 138. While underway onboard a DC diesel-electric drive ship, you notice excessive sparking of the brushes on the main propulsion motor. What should be your FIRST action?Not learned 139. How is the main shaft rotation on an AC diesel-electric propulsion vessel normally reversed?Not learned 140. By what common means is the speed of the AC propulsion motor on a diesel-electric propulsion ship controlled?Not learned 141. Which of the following is a disadvantage of electric drive propulsion systems?Not learned 142. On a vessel with turbo-electric drive, which of the following conditions would indicate that the propulsion motor had dropped out of synchronization with the propulsion generator?Not learned 143. An electric propulsion drive system in which the propulsion generator supplies power to both the propulsion motor and ship service loads is referred to as what type of system?Not learned 144. What equipment for modern SCR rectified DC propulsion drive systems is usually included in the package?Not learned 145. How is speed control of a DC propulsion motor accomplished?Not learned 146. What statement is TRUE concerning the Azipod propulsion system?Not learned 147. As shown in the illustration of a DC diesel-electric propulsion drive system, what would be the set up contactor configurations if #1 M/E is to be secured, so that only #2 M/E diesel-generator is set up to supply both propulsion motorsNot learned 148. Which of the electronic schematic symbols represents the capacitor illustrated in figure 4 of the illustrationNot learned 149. Which of the listed devices may be used as a digital device?Not learned 150. Which of the listed conditions describes the effect on intrinsic semiconductor operation as a result of a temperature increase?Not learned 151. You have installed a Zener diode in parallel with a load. While measuring the voltage across the Zener diode it is found that it does not change as the current through the load increases. In terms of Zener diode operation, what does this mean?Not learned 152. What would be the indication of a burned-out LED?Not learned 153. When using an ohmmeter to test a semiconductor diode, you find a low resistance in both the forward and reverse bias directions. What condition does this indicate?Not learned 154. An ohmmeter used to test for front-to-back resistance of a PN junction diode should produce roughly what ratio?Not learned 155. What is the functional purpose of a heat sink, as frequently used with transistors?Not learned 156. In order to check the performance of a transistor removed from its circuit, what meter or tester should be used?Not learned 157. Which of the following actions can be carried out in order to prevent thermal runaway in a transistor?Not learned 158. Which of the procedures or conditions listed could result in damaging a transistor beyond repair?Not learned 159. To conduct an in-circuit test of a transistor, what meter or tester should be used?Not learned 160. If the clock frequency input to the circuit shown in the illustration were 2 kHz, what would be indicated at the output of "FF-3" at the Q3 outputNot learned 161. What are some common basic applications for the operational amplifier?Not learned 162. In a logic circuit, how does a NOT gate function?Not learned 163. What is the name of the digital logic gate represented by figure "3" of the illustrationNot learned 164. What is the name of the digital logic gate represented by figure "1" of the illustrationNot learned 165. Which of the listed logic gates are considered to be the BASIC building blocks (basic logic gates) used in logic diagrams?Not learned 166. If the inputs to the diagram shown in figure "2" of the illustration were A=0 and B=0, what logic levels would be indicated at points "C", "D", "E", and "F" respectivelyNot learned 167. Power conversion for use in DC propulsion drive motors is accomplished by what type of converter?Not learned 168. What is the basic "control action" of a magnetic amplifier dependent upon?Not learned 169. A saturable-core reactor operates on the principle of controlling a load winding's inductance by changing the permeability of the core. How is this accomplished?Not learned 170. Although saturable reactors are extremely useful in some applications, why is their gain low?Not learned 171. Which of the following expresses the relationship of the AC input frequency and DC ripple output frequency in a full wave rectifier?Not learned 172. On vessels with AC distribution systems, which of the following statements represents the most difficult problem involved in obtaining a DC potential suitable for use by computer components?Not learned 173. The conversion of constant frequency power into adjustable frequency power in a modern AC propulsion drive system is commonly achieved through the use of what electronic system components?Not learned 174. If an 8-bit digital to analog converter (DAC) produces an analog output voltage with a range of 10 volts (0-9 volts), what is the smallest incremental step in voltage that can be generated at the output?Not learned 175. In mounting a transducer for a depth sounding system, what would represent an ideal location?Not learned 176. In process control terminology, continuously variable values which change without distinct increments, such as temperature, pressure, or level are correctly referred to as what type of values?Not learned 177. As shown in figure "B" of the illustrated function block for a PLC PID controller, to what input is the actual analog signal of the measured value deliveredNot learned 178. The conversion of the throttle command voltage to the signal necessary to achieve the desired shaft RPM is accomplished by what circuit?Not learned 179. What statement is true concerning read only memory (ROM)?Not learned 180. What statement is true concerning random access memory (RAM)?Not learned 181. Which of the following devices represents primary storage, where the processor is able to directly read instructions and data and directly return results of its computation in fetch/execute cycles?Not learned 182. Which of the following data communication cable types offers the greatest immunity to electromagnetic "noise"?Not learned 183. Modern ships use multiple computers arranged in a client/server network to perform various shipboard functions. What type of computer network would most likely be used aboard ship?Not learned 184. What Ethernet cabling technology supports the greatest data transfer speeds?Not learned 185. If a computer display is flickering, how may this be remedied?Not learned 186. An AC diesel-electric drive ship with synchronous propulsion motors has the capability for power factor correction. If the power factor associated with the main power distribution including all motors is unity (1.0). What statement is true?Not learned 187. With an AC synchronous electric propulsion motor driving a fixed-pitch propeller, whenever there is a direction reversal ordered from the bridge, there is a process of electrical braking used to slow the motor down before the shaft actually reverses. What is the name of this process?Not learned 188. With an AC synchronous electric propulsion motor driving a fixed-pitch propeller, whenever there is a direction reversal ordered from the bridge, there is a process of regenerative braking that is used to slow the motor down before the shaft actually reverses. Where is the energy associated with the inertia of rotation dissipated before reversal occurs?Not learned 189. According to the liquid crystal data display for the depth sounder shown in the illustration, what is the instantaneous depth currently being displayedNot learned 190. In addition to insulating the outboard bearing pedestal to prevent shaft currents in an alternator, what else must be insulated?Not learned 191. Assuming that the motor is capable of running with no rotor slip, what type of motor would be used in an AC propulsion drive system?Not learned 192. To avoid misleading readings when testing the discrete semiconductor components of a printed circuit board when testing it with a volt-ohmmeter, what practice or practices should be avoided? I. Using resistance scales requiring high power II. Forward biasing of junctions or reversing polarity of the leadsNot learned 193. A carbon resistor has the following color bands; band 1 is yellow, band 2 is violet, band 3 is yellow, and band 4 is silver. What is the value of the resistor in ohms, as well as the toleranceNot learned 194. A carbon resistor has a resistance of 50 ohms, and a tolerance of 5 percent. What would be the respective colors indicated for bands 1, 2, 3 and 4 for this resistor as shown in figure "A" of the illustrationNot learned 195. What does the circuit shown in the illustration representNot learned 196. What computer network device maintenance procedure is recommended to be increased in frequency when the equipment is located in areas of high vibration?Not learned 197. What is the most convenient instrument for measuring current, voltage and resistance?Not learned 198. What do the devices labeled "L" in Panel 2 of the illustrated switchboard representNot learned 199. What is the device shown in figure "B" of the illustration between the source circuit breaker and the loadNot learned 200. A digital multimeter, set up as a milliammeter on the 100 milliamp scale, is known to have an accuracy of plus or minus 2%. A display reading of 10.0 milliamps would indicate an actual line current between what two values?Not learned 201. If a digital multimeter is set up as shown in figure "B" of the illustration to test a capacitor, what would the display read if the capacitor was functioning properlyNot learned 202. If a digital multimeter is set up as shown in figure "A" of the illustration to test an AC contactor coil, what would the display read if the coil is open-circuitedNot learned 203. A digital multimeter is set up as shown in the illustration to evaluate the single-circuit stator windings of a squirrel cage induction three-phase motor. The following readings are taken: From T1 to T2 reads "OL" ohms. From T2 to T3 reads "OL" ohms. From T3 to T1 as shown reads "1.6" ohms. What condition is indicatedNot learned 204. If a digital multimeter is setup as shown in figures "A" and "B" to test a silicon diode, what is the status of the diode if the screen displays 0.70 V when configured as in figure "A" and displays OL V when configured as in figure "B"Not learned 205. What does the electronic symbol of figure "9" representNot learned 206. In figure "B" of the illustrated circuit, if the resistance of R1 is 10 ohms, R2 is 10 ohms, and R3 is 10 ohms, what is the total resistanceNot learned 207. In figure "A" of the illustration, the battery Vbb and resistor Rb are in the circuit for what purposeNot learned 208. Which figure represents the schematic symbol shown in figure "2"Not learned 209. Which of the following describes the action when the handle is moved to the "start" position of a drum-type motor controller used with a compound wound DC motor?Not learned 210. Which of the following electric propulsion motor types requires no brushes or electrical connections to the rotor?Not learned 211. Which of the following electrical schematic symbols represents a normally closed flow switchNot learned 212. Which of the following statements concerning figure "6" of the illustration is trueNot learned 213. Which of the following statements is TRUE concerning Azipod propulsion systems?Not learned 214. A fuse is the most common type of protection against a short-circuit fault in LV distribution circuits, motor circuits and for portable appliances. What is a major drawback or deficiency with the use of fuse?Not learned 215. In the illustrated motor controller, the motor fails to start. A voltmeter reading between 1 and 5 reads line voltage, while the voltmeter reading between 2 and 5 reads 0 VAC. What is most likely the problemNot learned 216. Which of the illustrated resistors represents the schematic symbol shown in figure "B"Not learned 217. Which of the illustrated safety disconnect switches represents a double-throw switchNot learned 218. In the illustrated switchboard, what is the purpose of the device labeled "AM SelNot learned 219. In the illustrated throttle control system, the amplifier 'M" functions to invert the signal received from the engine room or bridge reference potentiometer as appropriate. According to the operating mode selected for in the illustration, moving the engine room reference potentiometer in the direction indicated will have what effectNot learned 220. In the illustration what is the component labeled "C"Not learned 221. In the lighting distribution circuit shown in the illustrated lighting panel L110 of the illustration, if all circuit breakers are closed and due to a problem with the relevant feeder circuit breaker, there is a loss of power on the incoming phase A, which of the following statements is trueNot learned 222. Which of the listed devices is most likely to be installed on a large modern diesel-electric alternating current propulsion generator for commercial ship propulsion for the purposes of fire suppression?Not learned 223. Which of the listed types of lighting fixtures does the diagram shown in figure "A" of the illustration representNot learned 224. How is the main propeller shaft rotation of a conventional AC turbo-electric drive normally reversed? (Assume that no converters or inverters are used.)Not learned 225. If a mechanical mouse of a computer workstation is operating erratically, what maintenance should be performed?Not learned 226. On a modern silicon controlled rectified diesel-electric drive system, what are the characteristics of the main propulsion generators?Not learned 227. If the motor of the illustrated circuit fails to start and gives a loud hum when the start button is pushed, what is most likely the problemNot learned 228. The motor starts when the start button in the illustration is pushed, but stops when the button is released. What is most likely the troubleNot learned 229. What is the name of a TCP/IP application run from the command prompt which provides routing information by determining the path through the network to a destination which is entered by the user?Not learned 230. What is the name of a TCP/IP application run from the command prompt that sends datagrams once every second in the hope of an echo response from another machine (network device) being addressed to test network connectivity and to verify that TCP/IP is running?Not learned 231. On an older two-generator, two-motor DC diesel-electric drive system as shown in the illustration, what are the characteristics of the main propulsion generatorsNot learned 232. During its operation, loud buzzing and resultant welding of contacts of a magnetic relay may occur. Which of the following would be the likely cause?Not learned 233. In order to definitively determine whether or not fuse "1", shown in the illustration is blown using an on-line testing technique, across what points would you connect the voltmeter leadsNot learned 234. Overheating is suspected in a high voltage bolted bus-bar joint. If the local continuity resistance is to be checked off-line after the necessary safety precautions have been taken, what instrument would be used for the resistance test?Not learned 235. How are power transformers rated?Not learned 236. In preparation for paralleling generators, if the electric plant condition is as shown by graph "A", what would be the rotational status of the synchronizing lamps as shown in circuit "B"Not learned 237. To prevent shaft currents in an alternator, the outboard bearing shell or outboard bearing pedestal is insulated. If the methodology used is the insulated bearing pedestal, how is the pedestal insulation evaluated?Not learned 238. What problem with a printed circuit board may resolve itself once a board is removed from its edge card connector and then reinstalled?Not learned 239. What is the proper name for the entire device, including all subassemblies, shown in the illustrationNot learned 240. What is the purpose of the capacitor within component "5" of the circuit shown in figure "B" of the illustrationNot learned 241. What is the purpose of the device labeled "Man-Auto Sw." in the illustrated switchboardNot learned 242. For the purposes of safety and determining the shock hazard, nominal voltage is defined as the normal electrical system design voltage. This can be determined from what is displayed on nameplates, dataplates, schematics, or single-line diagrams. What does the nominal voltage represent?Not learned 243. For the purposes of shipboard practice, voltages above what threshold would be considered high voltage?Not learned 244. Refer to the simplified schematic of the various types of self-excited DC generators shown in the illustration. What is the configuration of figure "B"Not learned 245. Refer to the simplified schematic of the Ward-Leonard drive system shown in the illustration. The DC winch exhibits normal speed control from minimum to base speed, but the speed cannot be elevated above base speed. What condition would account for thisNot learned 246. Refer to the simplified schematic of the Ward-Leonard drive system shown in the illustration. What statement is true concerning the acceleration of the DC winch motor from base speed to maximum speed at constant horsepowerNot learned 247. Refer to the simplified schematic of the Ward-Leonard drive system shown in the illustration. What statement is true concerning the acceleration of the DC winch motor from minimum to base speed at constant torqueNot learned 248. Refer to the two-generator, two-motor, DC diesel-electric drive propulsion system simplified schematic shown in the illustration. Which of the following conditions would cause the propulsion shaft to only rotate in the ahead directionNot learned 249. Refer to the two-generator, two-motor, DC diesel-electric drive propulsion system simplified schematic shown in the illustration. While in two-generator, two-motor operation, which of the following conditions would cause the propulsion shaft speed to be approximately one-half the desired speedNot learned 250. Referring to figure "B" of the illustrated control circuit schematic diagram, which of the following statements is true when the motor is running in the forward directionNot learned 251. Referring to the illustration of a DC diesel-electric drive system, what type of DC propulsion motors are usedNot learned 252. Referring to the illustration of a twin-screw diesel-electric AC propulsion drive system, concerning the various control pulse signals, what statement is trueNot learned 253. Referring to the illustration of a twin-screw diesel-electric AC propulsion drive system, if either the port propulsion excitation transformer or the port propulsion field controller was inoperable, what statement is trueNot learned 254. What will be the resulting current when a voltage of 12 VDC is applied to a capacitance of 470 microfarads in figure "C" of the illustrated circuit after the capacitor has had ample time to fully chargeNot learned 255. What will be the resulting total current if a voltage of 125 VDC is applied to the loads of the circuit in figure "A" of the illustration where the resistance of R is 12 ohms, and R is 115 ohmsNot learned 256. When a self-excited DC generator's field has lost its residual magnetism due to a prolonged idle period, it will fail to produce a voltage. Flashing the field is the procedure used to restore the residual magnetism. Using a 12 volt storage battery, how is this performed?Not learned 257. As shown in figure "6" of the illustration, what does the symbol represent as used in electrical drawingsNot learned 258. As shown in figures "A", "B", and "C" of the illustration, what is the purpose of the differential amplifier segment of the 741 operational amplifierNot learned 259. As shown in figures "B" and "C" of the illustration, what should be the switch position and which test lead terminal jacks should be used if your intent is to measure DC currents anticipated as high as 200 milliampsNot learned 260. As shown in figure "B" of the illustrated block diagram of the signal processing flow path, the block "TRANSDUCER" represents a sensing and transmitting device designed to sense and measure a physical parameter and convert it into a proportional force or signal of what typeNot learned 261. As shown in figure "B" of the illustration, when the DC motor in figure "A" is operating at minimum speed what are the armature and field characteristicsNot learned 262. As shown in figure "B" of the illustration, what is the purpose of the synchronous compensatorNot learned 263. As shown in figure "B" of the illustration, what statement is true concerning "regenerating" operationNot learned 264. As shown in figure "B" of the illustration, what type of overload relay for motor protection is illustratedNot learned 265. As shown in figure "C" of the illustration, what are the purposes of the coupling capacitor Cc and the bypass capacitor Cbp respectivelyNot learned 266. As shown in figure "A" of the digital multimeter screen shown in the illustration, what would be the significance of the symbol indicated by "1" being illuminatedNot learned 267. As shown in figure "D" of the illustrated digital power meter, what type of single-phase load is under test for power measurementNot learned 268. As shown in figures "E" and "F" of the pictured high voltage rack mounted circuit breaker, which figure represents the circuit breaker position when in the open or tripped positionNot learned 269. As shown in figure "A" of the illustrated propulsion motor variable speed drive, what statement is trueNot learned 270. As shown in figure "A" of the illustration, under what conditions will the thyristor conductNot learned 271. As shown in figure "A" of the illustration, with a digital multimeter set up as an ohmmeter, what set of readings would be consistent with an open in phase "B" of the single circuit, wye-connected stator windings as shownNot learned 272. As shown in figure "A" of the illustration, what is the primary reason that the propulsion transformers are configured differently so as to produce a 30-degree phase shift in the pulses between the two synchro converters supplying separate stator windingsNot learned 273. As shown in figure "A" of the illustration, what is the purpose of the "test button"Not learned 274. As shown in figure "A" of the illustration, with respect to the common equipment grounding conductor, what statement is trueNot learned 275. As shown in figure "A" of the illustration, what is true concerning the illustrated frequency response curveNot learned 276. As shown in figure "A" of the illustration, what type of converter unit is representedNot learned 277. As shown in the alternator protection scheme diagram, what device provides the input to the overcurrent inverse time relay "OCIT", the overcurrent instantaneous trip "OC (inst.)", and the negative phase sequence relay "NPS"Not learned 278. As shown in the illustrated block diagram for a digitized echo sounding system, what statement is true concerning the function of the transducerNot learned 279. As shown in the illustrated block diagram for a digitized echo sounding system, what statement is true concerning the transmission and reception of acoustical energyNot learned 280. As shown in the illustrated block diagram for a distributed automation system, what statement is true concerning the area networksNot learned 281. As shown in the illustrated block diagram for a distributed automation system, what statement is true concerning the units labeled "WCU" in the accommodationsNot learned 282. As shown in the illustrated devices and symbols, which of the symbols shown in the illustration represents a standard normally closed relay contactNot learned 283. As shown in the illustrated diagnostic setup checking for a reversed field pole on a ten-pole synchronous motor, if a rotor is being checked after reassembly and the steel bolts repel each other as shown in the illustration, what condition is indicatedNot learned 284. As shown in the illustrated diagnostic setup for locating an open field coil of a tenpole synchronous motor, if 240 VDC is applied across the brushes, what statement is true if one of the field coils is open-circuitedNot learned 285. As shown in the illustrated echo sounding display unit and control panel and pertinent operating characteristic tables, what situation would require increasing the unit gainNot learned 286. As shown in the illustrated electric propulsion control scheme for a twin screw vessel, when the two shaft speeds are within 5% of each other, the bridge may select "shaft synchro-phasing mode". What statement is true regarding the purpose of this operating modeNot learned 287. As shown in the illustrated one-line diagram of a two-tiered emergency power system for a passenger ship, what statement is trueNot learned 288. As shown in the illustrated steering hydraulic pump motor controller, what statement is trueNot learned 289. As shown in the illustrated switchboard, what is the function of the switch labeled "PFM SelNot learned 290. As shown in the illustration, the change-over switch is what type of deviceNot learned 291. As shown in the illustration, which electrical symbol represents a PNP type bipolar junction transistorNot learned 292. As shown in the illustration, what event would give the same indication that would occur when a stern light circuit fuse blows openNot learned 293. As shown in the illustration, which of the following pieces of equipment is fed with the three conductor cable with the individual conductors having the smallest cross-sectional areaNot learned 294. As shown in the illustration, which of the following pieces of equipment is supplied with a circuit breaker providing both overload and short-circuit protectionNot learned 295. As shown in the illustration, what is the magnetic phase differential in degrees between the reference signal magnetic axis and the control signal magnetic axis of the illustrated diagram for a two-phase induction servomotor for an automatic radio direction finderNot learned 296. As shown in the illustration, by what means are all the "MS" contacts opened and closedNot learned 297. As shown in the illustration, what mechanism will disconnect the motor from the line in case of a sustained motor overloadNot learned 298. As shown in the illustration, if the port propulsion motor field excitation circuit experienced a failure of an individual component, of the following listed field excitation circuit components, the failure of which component would allow the use of the standby excitation transformer and field controller to resume normal operationNot learned 299. As shown in the illustration, what is the purpose of the main contacts of contactor "2S"Not learned 300. As shown in the illustration, what is the purpose of the Time Delay (TR) coil in the circuitNot learned 301. As shown in the illustration, what type of motor is controlled as depicted in both figure "A" and in figure "B"Not learned 302. As shown in the illustration, what type of motor and motor starter are featuredNot learned 303. What does the symbol labeled "OL" represent as shown in the power circuit on lines T1 and T3 to the motor as shown in figure "A" of the illustrationNot learned 304. While troubleshooting a circuit in an engine room central control console, a resistor is suspected of being faulty. Which of the following precautions must be observed if an analog or digital multimeter set up as an ohmmeter is to be used to check its value?Not learned 305. When troubleshooting a printed circuit board, one technique that can be used is component substitution. Upon what basis would a suspected defective component be substituted with a known good component?Not learned 306. When troubleshooting a printed circuit board, one technique that can be used is swapping the suspected damaged board with a new board. If a board extraction system is not available, what technique should be used to remove the suspected damaged board that is plugged into its edge card connector horizontally?Not learned 307. When troubleshooting a printed circuit board, one technique that can be used is swapping the suspected damaged board with a new board. When installing the new board which was stored in a specially manufactured antistatic bag, how may damage due to electrostatic discharge be prevented?Not learned 308. The turn's ratio of the step-down transformer with dual voltage secondary shown in figure "B" of the illustration is two to one (total). If 220 volts were applied to terminals 'H1' and 'H2', what would be measured across 'X3' and 'X4'Not learned 309. In the twin screw diesel-electric AC propulsion system shown in the illustration, what type of propulsion motors is usedNot learned 310. What type of circuit is represented by the diagram shown in the illustrationNot learned 311. What type of control circuit logic is featured in the electrical schematic diagram for the motor starting circuit shown in figure "B" of the illustrationNot learned 312. What type of electric propulsion system converter is shown in the illustrationNot learned 313. A very useful Windows utility for discovering or verifying IP addressing information of a network is "ipconfig". How is this utility program launched?Not learned 314. Using the catalog selection chart shown in Illustration EL-0180, determine the correct catalog number for a motor starter that meets the following criteria: NEMA Open enclosure 3-pole Rated at 45 continuous amperes Vertically mounted Electronic overload relay-Ground fault feature set Reversing starter Operating coil rated at 24 VAC/60 HzNot learned 315. Using the portable harmonic analyzer shown in figure "A", if the clamp-on test lead is connected as shown in figure "C" of the illustration, what is being measuredNot learned 316. Using the trouble analysis chart and faults table provided in the illustrations, if the adaptive digital steering system was malfunctioning, and the fault code 41 (SPEED LOG ERROR) is displayed, what corrective action should be performed LASTNot learned 317. Using the trouble analysis chart and faults table provided in the illustrations, if the adaptive digital steering system was malfunctioning, and the fault code 42 (SPEED LOG ERROR) is displayed, what corrective action should be performed FIRSTNot learned 318. Using the trouble analysis chart and faults table provided in the illustration, if the gyrocompass was malfunctioning, but no fault codes are present on the display unit, what is most likely the problem if the DC/DC converter LED status indicator is functioning properly, but the CPU LED status indicator is not blinkingNot learned 319. If the values of "C1" and "R1" shown in the illustration were 1 microfarad and 3 megohms respectively, which of the listed intervals of time would equal one "time constant"Not learned 320. A vessel is equipped with two ship's service generators. Generator No.1 is rated at 900 kW and generator No.2 is rated at 600 kW. During parallel operation, with a hotel load of 1,000 kW, what should be the kW load on generator No.2 if the load is shared proportionately?Not learned 321. In viewing the liquid crystal display for the illustrated depth sounder data display unit, what should be done if the graphic display of the ocean bottom is no longer visible on the screenNot learned 322. Without the benefit of a specially designed enclosure window for thermographic analysis, what must be done to obtain accurate, but safe readings using infrared thermographic techniques?Not learned 323. What would be considered the first line of defense in trying to prevent the build-up of dust on printed circuit boards associated with computer network devices?Not learned 324. What would be the resistance tolerance of a carbon resistor which is color-coded as red, violet, brown, and silver in bands 1 thru 4 respectfully as shown in figure "A" of the illustrationNot learned 325. What would be the terminal voltage and ampere-hour capacity of the battery bank illustrated if each battery was rated at 75 ampere-hours and 12 voltsNot learned 326. What would be the total current in figure "A" of the circuit illustrated if the value of capacitor C1 was 100 microfarads, capacitor C2 was 200 microfarads, and the power supply was 240 volts at 60 HzNot learned 327. For troubleshooting purposes, the key indicator to the safety and general condition of high voltage circuitry is insulation resistance. For a 6.6 kV high voltage system, what would be the recommended minimum insulation resistance value?Not learned 328. If a digital multimeter is set up as shown in figure "A" of the illustration, what would be displayed on the screen if the fuse being tested is blownNot learned 329. Which of the electronic schematic symbols represents the capacitor illustrated in figure "1" of the illustrationNot learned 330. As shown in the illustration, what is the purpose of the main contacts of contactor "1S"Not learned 331. What is the name of the device shown in figure "1" of the illustrationNot learned 332. An AC diesel-electric drive ship with synchronous propulsion motors has the capability for power factor correction. If the power factor associated with the main power distribution including all motors is 0.7 leading, what statement is true?Not learned