Q604 - 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 working on an electric cargo winch master switch or controller, what should be done?Not learned 5. Before work may safely commence on a high voltage system, what must first be done after disconnection and isolation?Not learned 6. 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 7. What will happen to a carbon resistor operating in electrical equipment that is NOT properly cooled?Not learned 8. What is the third color band on a resistor used to indicate?Not learned 9. Why is copper often used as an electrical conductor?Not learned 10. What is the reason that some electric cables are formed of stranded wire?Not learned 11. How should the shunt used in an ammeter be connected?Not learned 12. Which of the listed statements is correct when using a digital multimeter set up as an ohmmeter?Not learned 13. 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 14. When measuring DC current flow using an analog or digital multimeter set up as a milliammeter, how is the meter connected?Not learned 15. What can a typical common analog or digital multimeter be used to measure?Not learned 16. 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 17. 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 18. 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 19. What type of motor is generally used in DC propulsion drive systems?Not learned 20. How is reversal of a DC propulsion motor achieved?Not learned 21. In addition to improper brush pressure or seating, what can result in excessive sparking at the brushes of a DC propulsion motor?Not learned 22. 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 23. What are the operating characteristics of a step-down potential transformer in terms of the secondary load?Not learned 24. Why are transformer cores laminated?Not learned 25. 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 26. 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 27. What statement is TRUE concerning the speed of a synchronous AC propulsion motor?Not learned 28. How is the speed of the propeller shaft directly coupled to an AC synchronous propulsion motor changed when powered by a variable frequency alternator in an AC turboelectric drive system?Not learned 29. How are fuses usually rated?Not learned 30. 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 31. 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 32. When the operating handle of a molded-case circuit breaker is in the mid-position, what does this indicate?Not learned 33. Why is it necessary to perform periodic testing of correctly rated and properly installed circuit breakers?Not learned 34. 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 35. 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 36. Which of the listed classes of electrical insulation is suited for the highest operating temperature?Not learned 37. In testing a hand cranked megger prior to use, what statement is true?Not learned 38. 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 39. The timer element of a reverse power relay cannot be energized unless what condition is met?Not learned 40. Which of the listed sections of an emergency switchboard is used to supply power for alarm signals under emergency conditions?Not learned 41. What is the most common and reliable type of circuit breaker used for high voltage practice aboard ship?Not learned 42. 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 43. 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 44. 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 45. Which of the following procedures should be used to maintain a large electric motor during periods of inactivity?Not learned 46. Which of the following statements is true concerning the cleaning of electrical contacts?Not learned 47. By what means should motor controller contacts be routinely cleaned?Not learned 48. What item (or items) constitute routine AC motor controller maintenance?Not learned 49. What should be done with a capacitor that is obviously discolored due to excessive heat?Not learned 50. What is the greatest single cause of electrical failures?Not learned 51. 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 52. 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 53. What may cause magnetic controller contacts to become welded together during operation?Not learned 54. When troubleshooting motor controllers, what is a shorted relay or contactor coil often indicated by?Not learned 55. 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 56. 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 57. What is the name of the device shown in figure "2" of the illustrationNot learned 58. Which of the following statements is true concerning the operation of modern marine electric drive DC propulsion motors?Not learned 59. How is the speed of the propeller shaft directly coupled to an AC synchronous drive motor changed when powered by either a dedicated or integrated constant frequency alternator in an AC diesel- electric drive system?Not learned 60. How is the direction of propeller shaft rotation changed when directly coupled to an AC synchronous motor when driven by a variable frequency alternator in an AC turbo-electric drive system?Not learned 61. On DC diesel-electric drives, how is the speed of the DC propulsion motor primarily controlled?Not learned 62. How is the main propeller shaft rotation of a rectified DC diesel-electric drive normally reversed?Not learned 63. 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 64. By what common means is the speed of the AC propulsion motor on a diesel-electric propulsion ship controlled?Not learned 65. Which of the following is a disadvantage of electric drive propulsion systems?Not learned 66. 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 67. What equipment for modern SCR rectified DC propulsion drive systems is usually included in the package?Not learned 68. How is speed control of a DC propulsion motor accomplished?Not learned 69. How is the direction of rotation of the main propulsion motor in a modern AC propulsion drive system reversed?Not learned 70. What statement is TRUE concerning the Azipod propulsion system?Not learned 71. 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 72. 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 73. Which of the listed conditions describes the effect on intrinsic semiconductor operation as a result of a temperature increase?Not learned 74. 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 75. An ohmmeter used to test for front-to-back resistance of a PN junction diode should produce roughly what ratio?Not learned 76. What is the functional purpose of a heat sink, as frequently used with transistors?Not learned 77. In order to check the performance of a transistor removed from its circuit, what meter or tester should be used?Not learned 78. Which of the procedures or conditions listed could result in damaging a transistor beyond repair?Not learned 79. To conduct an in-circuit test of a transistor, what meter or tester should be used?Not learned 80. In a logic circuit, how does a NOT gate function?Not learned 81. What is the name of the digital logic gate represented by figure "3" of the illustrationNot learned 82. What is the name of the digital logic gate represented by figure "1" of the illustrationNot learned 83. Power conversion for use in DC propulsion drive motors is accomplished by what type of converter?Not learned 84. Although saturable reactors are extremely useful in some applications, why is their gain low?Not learned 85. Which of the following expresses the relationship of the AC input frequency and DC ripple output frequency in a full wave rectifier?Not learned 86. 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 87. In mounting a transducer for a depth sounding system, what would represent an ideal location?Not learned 88. 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 89. 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 90. The conversion of the throttle command voltage to the signal necessary to achieve the desired shaft RPM is accomplished by what circuit?Not learned 91. What statement is true concerning random access memory (RAM)?Not learned 92. What type of local area network physical topology features point-to-point interconnection between all communicating devices and is the least vulnerable to a break in communication?Not learned 93. 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 94. What Ethernet cabling technology supports the greatest data transfer speeds?Not learned 95. If a computer display is flickering, how may this be remedied?Not learned 96. 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 97. 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 98. According to the liquid crystal data display for the depth sounder shown in the illustration, what is the instantaneous depth currently being displayedNot learned 99. 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 100. What does the circuit shown in the illustration representNot learned 101. (1.1.10.1.1-2) What is a common type of protective covering used on electrical conductors?Not learned 102. 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 103. Concerning the method for the reversal of rotation of a DC propulsion motor, what statement is true?Not learned 104. What do the devices labeled "L" in Panel 2 of the illustrated switchboard representNot learned 105. What is the device shown in figure "B" of the illustration between the source circuit breaker and the loadNot learned 106. 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 107. 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 108. 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 109. 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 110. What does the electronic symbol of figure "9" representNot learned 111. 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 112. In figure "A" of the illustrated circuit, the amplifier is connected in what basic configurationNot learned 113. 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 114. 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 115. In the illustrated motor controller, what do the contacts across terminals "3" and "4" of the control circuit representNot learned 116. In the illustration what is the component labeled "C"Not learned 117. 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 118. Which of the listed types of lighting fixtures does the diagram shown in figure "A" of the illustration representNot learned 119. 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 120. 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 121. 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 122. 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 123. 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 124. 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 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 shipboard practice, voltages above what threshold would be considered high voltage?Not learned 128. 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 129. 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 130. 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 131. Referring to the illustration of a twin-screw diesel-electric AC propulsion drive system, what is the purpose of the shaft position signalNot learned 132. 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 133. What does section "C" of the circuit shown in the illustration function asNot learned 134. 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 135. As shown in figures "A", "B", and "C" of the illustration, what is the purpose of the regenerating mode when transitioning from ahead to astern operation with a fixed-pitch propeller as driven by an AC synchronous propulsion motorNot learned 136. 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 137. As shown in figure "B" of the illustration, what statement is true concerning "regenerating" operationNot learned 138. As shown in figure "D" of the illustrated digital power meter, what type of single-phase load is under test for power measurementNot learned 139. 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 140. As shown in figure "A" of the illustrated propulsion motor variable speed drive, what statement is trueNot learned 141. As shown in figure "A" of the illustration, under what conditions will the thyristor conductNot learned 142. As shown in figure "A" of the illustration, what is the configuration of the operational amplifierNot learned 143. As shown in figure "A" of the illustration, with respect to the common equipment grounding conductor, what statement is trueNot learned 144. As shown in figure "A" of the illustration, what is true concerning the illustrated frequency response curveNot learned 145. As shown in figure "A" of the illustration, what type of converter unit is representedNot learned 146. As shown in the illustrated block diagram for a digitized echo sounding system, what statement is true concerning the function of the transducerNot learned 147. 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 148. 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 149. 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 150. As shown in the illustration of a cycloconverter for an AC synchronous propulsion motor, what statement is true concerning the operating motor frequencyNot learned 151. As shown in the illustration, which electrical symbol represents a PNP type bipolar junction transistorNot learned 152. As shown in the illustration, which of the lighting fixtures represents an incandescent bulbNot learned 153. 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 154. As shown in the illustration, by what means are all the "MS" contacts opened and closedNot learned 155. As shown in the illustration, what mechanism will disconnect the motor from the line in case of a sustained motor overloadNot learned 156. As shown in the illustration, what is the purpose of the Time Delay (TR) coil in the circuitNot learned 157. As shown in the illustration, what type of motor is controlled as depicted in both figure "A" and in figure "B"Not learned 158. As shown in the illustration, what type of motor and motor starter are featuredNot learned 159. In what situation would an electrical phase sequence indicator be useful?Not learned 160. 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 161. 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 162. 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 163. What type of circuit is represented by the diagram shown in the illustrationNot learned 164. What type of electric propulsion system converter is shown in the illustrationNot learned 165. 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 166. 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 167. 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 168. 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 169. 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 170. 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 171. 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 172. 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 173. 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 174. What is the name of the device shown in figure "1" of the illustrationNot learned 175. 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