Q684 - Electrical, Electronic, & Control Engineering, USCG prep certification 2026

Progress: 24% (23/94)

Learning progress ?

1. 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 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 15 degrees right rudder, assuming left rudder signals are negative and right order signals are positive in polarityNot learned 3. 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 4. Before any work on electrical or electronic equipment is performed, which of the following precautions should be carried out?Not learned 5. Before working on an electric cargo winch master switch or controller, what should be done?Not learned 6. Before work may safely commence on a high voltage system, what must first be done after disconnection and isolation?Not learned 7. 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 8. What is the minimum threshold voltage at which the skin offers no appreciable resistance to electrical current flow and is known as the "skin-puncture voltage"?Not learned 9. Why should an electrical worker determine the nominal voltage of a circuit first before making contact with the circuit?Not learned 10. 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 11. 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 12. Which electrical schematic symbol represents a normally closed thermostatNot learned 13. Which of the electrical schematic symbols shown in the illustration represents a normally closed limit switchNot learned 14. What is the third color band on a resistor used to indicate?Not learned 15. Which of the following conditions would most likely lead to the failure of a resistor due to overheating?Not learned 16. How should the shunt used in an ammeter be connected?Not learned 17. Why are external shunts sometimes used with ammeters?Not learned 18. Which of the listed statements is correct when using a digital multimeter set up as an ohmmeter?Not learned 19. 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 20. 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 21. When measuring DC current flow using an analog or digital multimeter set up as a milliammeter, how is the meter connected?Not learned 22. What practice could potentially damage a multimeter?Not learned 23. 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 24. To properly use a clamp-on type ammeter to check current flow, what must be done FIRST?Not learned 25. 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 26. What type of motor is generally used in DC propulsion drive systems?Not learned 27. In addition to improper brush pressure or seating, what can result in excessive sparking at the brushes of a DC propulsion motor?Not learned 28. 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 29. 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 30. What may be the cause of an AC generator to fail to produce a voltage?Not learned 31. 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 32. 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 33. Upon loss of field excitation of a generator operating in parallel with others, what must be done?Not learned 34. 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 35. Utilizing the instructions and data provided in the illustration, what size overload relay heater would be the proper selection for a motor with the nameplate data shown? Assume the motor operates at sea level and that the motor and its starter share the same ambient temperatureNot learned 36. How are fuses usually rated?Not learned 37. 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 38. 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 39. To test fuses in an energized circuit, what testing apparatus or meter should be used?Not learned 40. In addition to short circuits and sustained overloads, in what other situation are fuses likely to blow?Not learned 41. When the operating handle of a molded-case circuit breaker is in the mid-position, what does this indicate?Not learned 42. Why is it necessary to perform periodic testing of correctly rated and properly installed circuit breakers?Not learned 43. What should be done when performing maintenance of circuit breaker contacts?Not learned 44. 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 45. With what kind of starting equipment are most three-phase induction motors of five horsepower or less started?Not learned 46. As shown in the illustrated three-phase squirrel cage induction motor controller, what type of reduced voltage starter is usedNot learned 47. Why are motor controllers seldom troubled by grounds?Not learned 48. Which of the following illustrated circuit schematics provides phase failure protection for a three phase motor using load side voltage sensing technologyNot learned 49. 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 50. Which of the listed classes of electrical insulation is suited for the highest operating temperature?Not learned 51. In testing a hand cranked megger prior to use, what statement is true?Not learned 52. 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 53. 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 54. The timer element of a reverse power relay cannot be energized unless what condition is met?Not learned 55. As chief engineer, to prevent the motorization of an alternator what safety device would you have checked quarterly?Not learned 56. 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 57. What is the most common and reliable type of circuit breaker used for high voltage practice aboard ship?Not learned 58. 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 59. 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 60. Which of the following procedures should be used to maintain a large electric motor during periods of inactivity?Not learned 61. Which of the following statements is true concerning the cleaning of electrical contacts?Not learned 62. By what means should motor controller contacts be routinely cleaned?Not learned 63. What item (or items) constitute routine AC motor controller maintenance?Not learned 64. If many turns of an operating coil of an AC contactor become short-circuited, in terms of the coil, what is the likely result?Not learned 65. When troubleshooting motor controllers, what is a shorted relay or contactor coil often indicated by?Not learned 66. 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 67. On DC diesel-electric drives, how is the speed of the DC propulsion motor primarily controlled?Not learned 68. In a diesel-electric plant, raising the generator's field excitation current will have what effect on the DC propulsion motor speed?Not learned 69. What is one major advantage of a diesel-electric propulsion plant?Not learned 70. 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 71. 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 72. Which of the following is a disadvantage of electric drive propulsion systems?Not learned 73. 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 74. How is speed control of a DC propulsion motor accomplished?Not learned 75. How is the direction of rotation of the main propulsion motor in a modern AC propulsion drive system reversed?Not learned 76. Which of the listed devices may be used as a digital device?Not learned 77. On a digital numerical display readout, what would be the minimum number of LED segments required to form and display any digit 0 through 9?Not learned 78. Which of the listed conditions describes the effect on intrinsic semiconductor operation as a result of a temperature increase?Not learned 79. An ohmmeter used to test for front-to-back resistance of a PN junction diode should produce roughly what ratio?Not learned 80. What is the functional purpose of a heat sink, as frequently used with transistors?Not learned 81. Which of the procedures or conditions listed could result in damaging a transistor beyond repair?Not learned 82. 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 83. Although saturable reactors are extremely useful in some applications, why is their gain low?Not learned 84. Which of the following expresses the relationship of the AC input frequency and DC ripple output frequency in a full wave rectifier?Not learned 85. 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 86. In mounting a transducer for a depth sounding system, what would represent an ideal location?Not learned 87. 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 88. What statement is true concerning random access memory (RAM)?Not learned 89. What Ethernet cabling technology supports the greatest data transfer speeds?Not learned 90. If a computer display is flickering, how may this be remedied?Not learned 91. 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 92. 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 93. According to the liquid crystal data display for the depth sounder shown in the illustration, what is the instantaneous depth currently being displayedNot learned 94. In addition to insulating the outboard bearing pedestal to prevent shaft currents in an alternator, what else must be insulated?Not learned 95. Assuming the alternator shown in figure "A" of the illustration is equipped with a diode plate as configured in figure "D", what is the purpose of the diode plateNot learned 96. What does the circuit shown in the illustration representNot learned 97. 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 98. What is the most convenient instrument for measuring current, voltage and resistance?Not learned 99. What is the correct methodology to prevent shaft currents in an alternator?Not learned 100. If a digital multimeter is setup as shown in figures "A" and "B" of the illustration, what is the status of the silicon diode if the display reads 4.7 ohms when configured as in figure "A" and reads 490 ohms when configured as in figure "B"Not learned 101. 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 102. 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 103. 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 104. What does the electronic symbol of figure "9" representNot learned 105. 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 106. Which of the following electrical schematic symbols represents a normally closed flow switchNot learned 107. 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 108. The greatest cause of electrical failures is the breakdown of insulation. What factors would you use to determine the frequency of cleaning of electrical apparatus to avoid future failures?Not learned 109. In the illustrated motor controller, what do the contacts across terminals "3" and "4" of the control circuit representNot learned 110. Which of the illustrated resistors represents the schematic symbol shown in figure "B"Not learned 111. In the illustration what is the component labeled "C"Not learned 112. 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 113. 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 114. If a mechanical mouse of a computer workstation is operating erratically, what maintenance should be performed?Not learned 115. 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 116. 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 117. 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 118. On an older two-generator, two-motor DC diesel-electric drive system as shown in the illustration, if both the A1 and A2 contactors are dropped out, both the S1 and S2 contactors are dropped out, and both the G1 and G2 contactors are pulled in, what is the configuration of the plantNot learned 119. On an older two-generator, two-motor DC diesel-electric drive system shown in the illustration, which statement is trueNot learned 120. What are the operational characteristics of the two alternators with the speed droop curves shown in figure "A" of the illustrationNot learned 121. 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 122. 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 123. 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 124. 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 125. 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 126. What is the purpose of the device labeled "Man-Auto Sw." in the illustrated switchboardNot learned 127. 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 128. For the purposes of shipboard practice, voltages above what threshold would be considered high voltage?Not learned 129. 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 130. 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 131. Referring to the illustration of a DC diesel-electric drive system, what type of DC propulsion motors are usedNot learned 132. What does section "C" of the circuit shown in the illustration function asNot learned 133. 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 134. 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 135. As shown in figure "B" of the illustration, what is the purpose of the synchronous compensatorNot learned 136. As shown in figure "B" of the illustration, if the source voltage at the branch circuit breaker is 220 VAC, what would be the applied voltage to the loadNot learned 137. As shown in figure "B" of the illustration, what statement is true concerning "regenerating" operationNot learned 138. As shown in figure "B" of the illustration, what type of overload relay for motor protection is illustratedNot learned 139. As shown in figure "C" of the illustration, what are the purposes of the coupling capacitor Cc and the bypass capacitor Cbp respectivelyNot learned 140. As shown in figure "D" of the illustrated digital power meter, what type of single-phase load is under test for power measurementNot learned 141. 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 142. As shown in figure "A" of the illustrated propulsion motor variable speed drive, what statement is trueNot learned 143. As shown in figure "A" of the illustration, what type of converter unit is representedNot learned 144. 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 145. As shown in the illustrated block diagram for a digitized echo sounding system, what statement is true concerning the function of the transducerNot learned 146. 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 147. As shown in the illustrated graph showing the effect of overshoot on steering system control stability, what statement is trueNot learned 148. As shown in the illustrated one-line diagram of a two-tiered emergency power system for a passenger ship, what statement is trueNot learned 149. As shown in the illustration of a cycloconverter for an AC synchronous propulsion motor, what statement is true concerning the operating motor frequencyNot learned 150. 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 151. As shown in the illustration, by what means are all the "MS" contacts opened and closedNot learned 152. As shown in the illustration, what mechanism will disconnect the motor from the line in case of a sustained motor overloadNot learned 153. 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 154. As shown in the illustration, what type of motor is controlled as depicted in both figure "A" and in figure "B"Not learned 155. As shown in the illustration, what type of motor and motor starter are featuredNot learned 156. In what situation would an electrical phase sequence indicator be useful?Not learned 157. 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 158. When troubleshooting the modems, network interface cards, hubs, switches, and routers of a network, what technique represents the most logical first step?Not learned 159. 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 160. 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 161. 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 162. 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 163. 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 164. 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 165. As shown in the illustrated diagnostic setup for locating a shorted field coil of a ten-pole salient pole alternator, if 240 VAC/60 Hz is applied across the brushes, what would be the voltage drop across field coil No.4 if that field coil had shorted turns and the other field coils were free of shortsNot learned 166. 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 167. 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 168. Which of the following illustrated circuit schematics provides phase failure protection for a three phase motor using load side current sensing technologyNot learned 169. 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