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1 U.S.C.G. Merchant Marine Exam Assistant Engineer-Limited (Sample Examination) 8/30/2017 Page 1 of 43

2 U.S.C.G. Merchant Marine Exam Assistant Engineer-Limited Illustrations: 25 Choose the best answer to the following Multiple Choice Questions. 1. What is the primary purpose associated with the use of transformers onboard ships with AC generators? (A) provide different voltage values to operate various types of electrical equipment o (B) decrease power output to modulating frequency controllers o (C) change line frequency value o (D) increase power output to modulating frequency controllers If choice A is selected set score to A thermal-magnetic circuit breaker for a 300 kw alternator is rated at 500 amperes at full continuous load. Which of the following conditions will trip the breaker? o (A) Sustained current draw of 450 amperes for 2 hours. o (B) Sustained current draw of 500 amperes for 10 minutes. o (C) Momentary current draw of 1000 amperes for 3 seconds. (D) Instantaneous current draw of 5,000 amperes. If choice D is selected set score to In referring to the graphs shown in the illustration, which of the following figures represents a bandpass filter? Illustration EL-0076 o (A) A o (B) B (C) C o (D) D 4. Referring to the sound-powered telephone circuit shown in the illustration, in what component are the sound-powered transmitter and receiver units located? Illustration EL-0093 (A) A o (B) B o (C) C o (D) D If choice A is selected set score to 1. 8/30/2017 Page 2 of 43

3 U.S.C.G. Merchant Marine Exam Assistant Engineer-Limited Illustrations: Which of the following voltage testers would be associated with high quality, be safe to use, and minimize the electric shock hazard? (A) a voltage tester with a high input impedance and a voltage rating higher than any expected measured voltages o (B) a voltage tester with a low input impedance and a higher voltage rating than any expected measured voltages o (C) a voltage tester with a low input impedance and a lower voltage rating than any expected measured voltages o (D) a voltage tester with a high input impedance and a lower voltage rating than any expected measured voltages If choice A is selected set score to A DC generator which is used to supply direct current in order to provide magnetizing current to an AC generator field is commonly known as what? o (A) armature (B) exciter o (C) stator o (D) rotor If choice B is selected set score to As shown in the illustration, if the port propulsion motor field excitation circuit experienced a failure, what individual component failure would allow the use of the standby excitation transformer and standby field controller to resume normal operation? Illustration EL-0164 o (A) port rotary transformer o (B) port rotating rectifier (C) port field controller o (D) port motor field winding 8. As shown in the two-speed single winding three-phase motor connection diagrams illustrated in figure "B", what is the connection scheme associated with low-speed operation? Illustration EL-0118 o (A) parallel delta (B) series delta o (C) parallel wye o (D) series wye If choice B is selected set score to 1. 8/30/2017 Page 3 of 43

4 U.S.C.G. Merchant Marine Exam Assistant Engineer-Limited Illustrations: The multiplier prefix "giga" (G) such as used in "gigabytes" represents what multiplication factor? o (A) thousand (10 to the 3rd power) o (B) million (10 to the 6th power) (C) billion (10 to the 9th power) o (D) trillion (10 to the 12th power) 10. When a fluorescent lamp has reached the end of its useful life, it should be replaced immediately. If not, what condition could the resultant flashing cause? o (A) tripping of the lamp's circuit breaker o (B) exploding of the lamp, causing glass to fly in all directions (C) damaging the lamps starter and ballast circuit o (D) short circuiting of adjacent lighting circuits 11. As the electrolyte level in the cells of a lead-acid battery evaporates over time, what will tend to happen to the specific gravity of the electrolyte in the cells as the level drops due to evaporation? o (A) Although the specific gravity will change due to evaporation, there is no predictable tendency either way. o (B) The specific gravity of the electrolyte will decrease as only the sulfuric acid will evaporate from the electrolyte solution. o (C) The specific gravity of the electrolyte will remain unchanged as both the water and sulfuric acid will evaporate from the electrolyte solution. (D) The specific gravity of the electrolyte will increase as only the water will evaporate from the electrolyte solution. If choice D is selected set score to A voltage amplifier has a calculated voltage gain of 5. Which statement is true concerning input and output voltages? (A) If the input changes 2 volts, the output changes 10 volts. o (B) If the input changes 5 volts, the output changes 10 volts. o (C) If the input changes 10 volts, the output changes 2 volts. o (D) If the input changes 10 volts, the output changes 5 volts. If choice A is selected set score to 1. 8/30/2017 Page 4 of 43

5 U.S.C.G. Merchant Marine Exam Assistant Engineer-Limited Illustrations: What type of electrical diagram for the electrical distribution system is shown in the illustration? Illustration EL-0014 o (A) The diagram is an isometric diagram. o (B) The diagram is a ladder or line diagram (schematic). (C) The diagram is a one-line diagram. o (D) The diagram is a wiring diagram. 14. With all other factors considered equal (such as voltage, conducting path through the body and the duration of contact), contact with an energized electrical system conductor of which system type would produce the most damaging effect? o (A) DC systems (B) 60 Hz AC systems o (C) 10 khz AC systems o (D) All the above systems would be equally as damaging If choice B is selected set score to In performing routine maintenance of a ship's service alternator, what should be included? o (A) lubricating exciter slip rings o (B) megger testing of all rectifying diodes o (C) changing the pedestal bearing insulation yearly (D) periodic cleaning of the air filters or screens If choice D is selected set score to What is the most reliable and preferred method for determining the state of charge of a wet cell NiCad battery? o (A) Measuring the specific gravity of each cell with a hydrometer. (B) Measuring the battery voltage with a digital voltmeter during charge or discharge. o (C) Measuring the battery voltage with a solenoid type voltage tester during charge or discharge. o (D) Measuring the temperature corrected specific gravity of each cell with a hydrometer and thermometer. If choice B is selected set score to What is the functional purpose of the "MS 2" contacts in the hoist controller circuit shown in the illustration? Illustration EL-0102 o (A) The "MS 2" contacts are used to select for "second point" hoisting and lowering o (B) The "MS 2" contacts are used to select for "first point" hoisting and lowering (C) The "MS 2" contacts are not used in this particular application o (D) The "MS 2" contacts are used for resetting the under voltage (UV) contactor 8/30/2017 Page 5 of 43

6 U.S.C.G. Merchant Marine Exam Assistant Engineer-Limited Illustrations: If the cooling water system is isolated for repairs, but it is still desirable to run the alternator pictured in figure "A" of the illustration, what must be done? Illustration EL-0037 o (A) The emergency air inlet panel and air outlet doors must remain closed, which requires the alternator to be run only at reduced loads. (B) The emergency air inlet panel and air outlet doors must be opened and only then can the alternator be run, but at reduced load. o o (C) The alternator may not be run without cooling water under any circumstances. (D) The emergency air inlet panel and air outlet doors must be opened, but in doing so allows the alternator to be run at rated load. If choice B is selected set score to Referring to the containership one-line distribution diagram shown in the illustration, what statement is true concerning the battery charger? Illustration EL-0014 o (A) The battery charger gets its AC power from the 120 VAC section of the main switchboard and is capable of providing DC charging current to both battery banks simultaneously. o (B) The battery charger gets its AC power from the 120 VAC section of the emergency switchboard and is capable of providing DC charging current to both battery banks simultaneously. (C) The battery charger gets its AC power from the 120 VAC section of the emergency switchboard and is capable of providing DC charging current to only one battery bank at a given time. o (D) The battery charger gets its AC power from the 120 VAC section of the main switchboard and is capable of providing DC charging current to only one battery bank at a given time. 20. What statement is true concerning the "MS 1" contacts of the master switch shown in the illustration? Illustration EL-0102 (A) They are closed only when the master switch is "off". o (B) They are closed only when the master switch is selected for a "lower" position. o (C) They are closed only when the master switch is selected for a "hoist" position. o (D) They are opened only when the master switch is "off". If choice A is selected set score to A bearing temperature monitoring system such as that used for measuring selected propulsion plant bearings uses what technology? o (A) self-powered thermocouples o (B) self-powered resistance temperature detectors o (C) externally powered thermocouples (D) externally powered resistance temperature detectors If choice D is selected set score to 1. 8/30/2017 Page 6 of 43

7 U.S.C.G. Merchant Marine Exam Assistant Engineer-Limited Illustrations: Which of the following procedures represents the best method to prevent the freezing of batteries continuously exposed to low temperatures? o (A) The battery cap vents should be sealed. o (B) The battery caps should be removed. o (C) The battery should be disconnected from its charging source. (D) The battery should be kept in a fully charged condition. If choice D is selected set score to Which of the following data communication cable types offers the greatest immunity to electromagnetic "noise"? o (A) Coaxial (coax) o (B) Shielded twisted pair o (C) Unshielded twisted pair (D) Fiber-optic If choice D is selected set score to What statement is true concerning the electrical diagram shown in figure "B" of the illustration? Illustration EL-0019 o (A) The voltages measured across "R 1 ", "R 2 " and "R 3 " will be different if "R 1 ", "R 2 " and "R 3 " have different values. o (B) The total resistance equals R 1 + R 2 + R 3. (C) "R 1 ", "R 2 ", and "R 3 " are connected in parallel. o (D) "R 1 ", "R 2 ", and "R 3 " are connected in series. 25. A simple, untapped, single phase 480/120 VAC step-down control transformer is rated at 600 VA at 60 Hz. What is the rated secondary load current? o (A) 1.25 amperes o (B) 4 amperes (C) 5 amperes o (D) 10 amperes 26. What is the name of the part of the shipboard electrical system used to control the distribution of power to the branch circuits? o (A) disconnect links (B) main switchboard o (C) governor relay box o (D) bridge control panel If choice B is selected set score to 1. 8/30/2017 Page 7 of 43

8 U.S.C.G. Merchant Marine Exam Assistant Engineer-Limited Illustrations: As shown in the illustrated plots of uncorrected and temperature corrected insulation resistance readings for a particular piece of equipment, at what point in time should the equipment have been refurbished or replaced? Illustration EL-0120 o (A) 2006 o (B) 2008 o (C) 2010 (D) no refurbishment or replacement was necessary through 2011 If choice D is selected set score to Concerning the illustrated fire detection and alarm system, when the system is operating normally and under supervision, what is the status of the ground detector and the fire alarm relays? Illustration EL-0114 o (A) The ground detector relay is energized and the fire alarm relay is de-energized. o (B) Both the ground detector and the fire alarm relays are both de-energized. (C) The ground detector relay is de-energized and the fire alarm relay is energized. o (D) Both the ground detector and the fire alarm relays are both energized. 29. As shown in the illustrated harmonic analysis diagram, which figure represents the fundamental (or first harmonic)? Illustration EL-0163 o (A) A (B) B o (C) C o (D) D If choice B is selected set score to As shown in figure "A" of the illustrated PLC sub-circuit, what type of circuit is depicted? Illustration EL-0230 (A) AC input unit o (B) AC output unit o (C) DC input unit o (D) DC output unit If choice A is selected set score to 1. 8/30/2017 Page 8 of 43

9 U.S.C.G. Merchant Marine Exam Assistant Engineer-Limited Illustrations: Why are large cable sizes often formed as individual conductors comprised of several smaller strands? o (A) reduce the overall weight of the wire run o (B) reduce the number of supports needed for a horizontal overhead run (C) obtain the flexibility required for easy handling and reduces skin effect losses o (D) reduce the resistance to current flow for a given wire size 32. In comparing a semiconductor diode to a vacuum tube diode, what statement is true? o (A) The semiconductor diode has longer life, no warm-up time, and is more delicate than the vacuum tube diode. o (B) The semiconductor diode has longer life, longer warm-up time, and is less delicate than the vacuum tube diode. o (C) The semiconductor diode has shorter life, no warm-up time, and is less delicate than the vacuum tube diode. (D) The semiconductor diode has longer life, no warm-up time, and is less delicate than the vacuum tube diode. If choice D is selected set score to Referring to figure "B" of the illustration, what statement is true? Illustration EL-0020 (A) The current drawn by the circuit will be inversely proportional to the total resistance of the entire circuit. o (B) If the resistance values of the individual resistors are uniquely different, each resistor will have a uniquely different current draw. o (C) The current drawn by the circuit will be directly proportional to the total resistance of the entire circuit. o (D) The current drawn by an individual resistor will be proportional to the resistance of that resistor. If choice A is selected set score to What does the circuit shown in the illustration represent? Illustration EL-0085 (A) regulated DC power supply o (B) a Wheatstone bridge o (C) a waveform analyzer o (D) a magnetic amplifier If choice A is selected set score to 1. 8/30/2017 Page 9 of 43

10 U.S.C.G. Merchant Marine Exam Assistant Engineer-Limited Illustrations: What should you be aware of when checking the specific gravity of the battery electrolyte with a hydrometer? (A) depending on the temperature it may be necessary to correct for temperature o (B) the battery is discharged when the float is highest in the electrolyte o (C) a hydrometer reading is accurate if taken immediately after water is added to the cell o (D) the battery is fully charged when the float sinks deepest into the electrolyte If choice A is selected set score to Which electrical schematic symbol shown in the illustration represents a thermostat which opens on rising temperature? Illustration EL-0059 o (A) 1 o (B) 6 (C) 8 o (D) What practice could potentially damage a multimeter? o (A) placing the test leads in series with the load of a circuit to measure current while in the voltmeter mode (B) placing the test leads across a voltage source to measure voltage while in the resistance mode o (C) placing the test leads across a de-energized and isolated resistance to measure resistance while in the voltmeter mode o (D) placing the test leads across a de-energized and isolated resistance to measure resistance while in the ammeter mode If choice B is selected set score to The leads from an ohmmeter are attached to the leads of the opposite ends of an AC motor stator field coil. If a reading of infinity is obtained, what does this indicate? o (A) grounded field coil o (B) shunted field coil o (C) shorted field coil (D) open field coil If choice D is selected set score to 1. 8/30/2017 Page 10 of 43

11 U.S.C.G. Merchant Marine Exam Assistant Engineer-Limited Illustrations: Why are electric strip heaters used in motor controllers? o (A) keep the components at their design ambient temperature o (B) minimize resistance in internal circuits o (C) prevent freezing of movable contacts (D) prevent condensation of moisture If choice D is selected set score to What will be the impact of reduced voltage applied to a motor during the starting period? o (A) increase the starting current and decrease the acceleration time o (B) decrease the starting current and decrease the acceleration time o (C) increase the starting current and increase the acceleration time (D) decrease the starting current and increase the acceleration time If choice D is selected set score to What is the current flowing through R 3 in figure "B" of the illustrated circuit when the switch is closed if the battery voltage is 12 VDC and resistance of R 1 is 2 ohms, R 2 is 3 ohms, and R 3 is 6 ohms, respectively? Illustration EL-0019 (A) 2 amps o (B) 4 amps o (C) 6 amps o (D) 12 amps If choice A is selected set score to As shown in the illustrated block diagram for a distributed automation system, what statement is true concerning the workstations labeled "LOS" associated with the port power management system? Illustration EL-0096 o (A) These are local operating system workstations that allow local control of processes related to the operation and control of all functions within the engineering plant. (B) These are local operating system workstations that allow local control of processes related to the operation and control of the port generator. o (C) These are lube oil system workstations that allow local control of processes related to the lubrication of the port generators. o (D) These are lube oil system workstations that allow local control of processes related to the lubrication of all machinery within the engineering plant. If choice B is selected set score to 1. 8/30/2017 Page 11 of 43

12 U.S.C.G. Merchant Marine Exam Assistant Engineer-Limited Illustrations: 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? o (A) To completely eliminate ground fault current o (B) To maximize the magnitude of the ground fault current o (C) To prevent nuisance ground fault trips (D) To minimize the magnitude of the ground fault current If choice D is selected set score to Which of the following is a disadvantage of electric drive propulsion systems? (A) Propulsion motors are required along with electrical power generation machinery. o (B) Main propulsion power may also be directed to ships electrical service distribution. o (C) The propeller speed and direction of rotation are easily controllable. o (D) Location of electric power generation machinery is flexible. If choice A is selected set score to Which of the following illustrated manual motor starters represents the wiring diagram illustrated in figure "A"? Illustration EL-0023 (A) 1 o (B) 2 o (C) 3 o (D) 4 If choice A is selected set score to How should the shunt used in an ammeter be connected? o (A) in series with the load and in series with the meter movement o (B) in parallel with the load and in series with the meter movement (C) in series with the load and in parallel with the meter movement o (D) in parallel with the load and in parallel with the meter movement 47. How may the unit "hertz" be best described? o (A) revolutions per minute (B) cycles per second o (C) coulombs per second o (D) revolutions per second If choice B is selected set score to 1. 8/30/2017 Page 12 of 43

13 U.S.C.G. Merchant Marine Exam Assistant Engineer-Limited Illustrations: If overloading an electric motor becomes necessary in an emergency situation, what should be done to prevent damage to the motor while allowing sustained operation? o (A) increase the residual magnetism value of windings to reduce eddy currents o (B) hold thermal overload relays open with blocks of wood o (C) inject small amounts of CO 2 into the windings for cooling (D) cool the motor with portable blowers and fans If choice D is selected set score to A salinity indicator system such as that used to measure the salt content of potable water systems and boiler feed and condensate systems uses what technology? o (A) a salinity cell that senses the ph of water o (B) a salinity cell that senses the brine density of water (C) a salinity cell that senses the electrical conductivity of water o (D) a salinity cell that senses the optical refraction of water 50. 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? o (A) a multi-purpose system o (B) a dedicated system (C) an integrated system o (D) a composite system 51. Assuming that the electrolyte has had sufficient time to be uniformly diffused throughout the cell, if the open-circuit cell voltage as measured by a digital multimeter is 2.12, what would be the approximate specific gravity? o (A) o (B) (C) o (D) In an azipod propulsion system, how is three-phase, frequency and voltage controlled power delivered to the synchronous propulsion motor stator windings? (A) By the use of slip rings and brushes. o (B) By rotary transformer action. o (C) By direct connection to the stator windings. o (D) By the use of commutator bars and brushes. If choice A is selected set score to 1. 8/30/2017 Page 13 of 43

14 U.S.C.G. Merchant Marine Exam Assistant Engineer-Limited Illustrations: Referring to the impressed current cathodic protection system shown in the illustration, if required to control the current to the anodes manually by using the hand adjustment potentiometer, what statement best represents the changes that should prompt one to recheck the reference electrode voltage (hull potential)? Illustration EL-0090 (A) Changes in vessel speed, sea water temperature, and sea water salinity should all prompt rechecking. o (B) Changes in sea water temperature and vessel speed should all prompt rechecking. Changes in sea water temperature need not prompt rechecking. o (C) Changes in sea water temperature and sea water salinity should all prompt rechecking. Changes in vessel speed need not prompt rechecking. o (D) Changes in sea water salinity and vessel speed should all prompt rechecking. Changes in sea water temperature need not prompt rechecking. If choice A is selected set score to When testing a capacitor with a digital multimeter set up as an ohmmeter, what would be the indication on the display when testing an initially discharged capacitor in good condition? (A) the display would immediately show very low resistance but gradually climb to "OL" o (B) the display would immediately show very low resistance but rapidly climb to a slightly higher value and remain there o (C) the display would immediately show very low resistance and remain at this value o (D) the display would immediately show "OL" ohms and remain at this value If choice A is selected set score to 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? o (A) Disconnect the common connection to hull ground first, then disconnect the phase connections to common. o (B) The common to hull ground and the phase connections to common should all be disconnected simultaneously. (C) Disconnect the phase connections to common first, then disconnect the common connection to hull ground. o (D) The common to hull ground connection and the phase connections to common can all be disconnected in any sequence. 8/30/2017 Page 14 of 43

15 U.S.C.G. Merchant Marine Exam Assistant Engineer-Limited Illustrations: Suppose it is desired to connect a dual voltage three-phase squirrel-cage induction motor for low volts, but it is undetermined whether the nine-lead motor is internally configured for wye or delta configuration. Using an ohmmeter, the motor itself with leads disconnected, and the illustration as a guide, what statement is true? Illustration EL-0134 o (A) If leads "4", "5", and "6" have continuity across each other, the motor is "wye" configured. Without continuity, the motor is "delta" configured. o (B) If leads "4", "5", and "6" have continuity across each other, the motor is "delta" configured. Without continuity, the motor is "wye" configured. (C) If leads "7", "8", and "9" have continuity across each other, the motor is "wye" configured. Without continuity, the motor is "delta" configured. o (D) If leads "7", "8", and "9" have continuity across each other, the motor is "delta" configured. Without continuity, the motor is "wye" configured. 57. What is the characteristic that is associated with an "instantaneous-trip" single-element type fuse? o (A) opens a circuit by using a time delay element with a magnetic trip (B) opens as soon as the load current exceeds its set point o (C) allows a preset delay between overcurrent and melting o (D) resets itself when the overcurrent is corrected If choice B is selected set score to What is a useful instrument for checking 3-phase AC motor performance by measuring possible unbalanced currents? o (A) D'Arsonval iron-vane probe o (B) hand or battery-operated megger (C) clamp-on ammeter o (D) vibrating-reed frequency meter 59. 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? o (A) Increase the cooling water flow, while maintaining air temperatures below the dew point for increased cooling effect. o (B) While maintaining the rated system voltage, lower the operating frequency to at least 5% below the rated system frequency. o (C) While maintaining the rated system frequency, lower the operating voltage to at least 5% below the rated system voltage. (D) Increase the cooling water flow, while maintaining air temperatures above the dew point to avoid any condensation. If choice D is selected set score to 1. 8/30/2017 Page 15 of 43

16 U.S.C.G. Merchant Marine Exam Assistant Engineer-Limited Illustrations: When an alternator is to remain idle for even a few days, what should be done? o (A) open the equalizing bus disconnect switch (B) energize the space heater circuit o (C) insulate the collector rings with strips of cardboard o (D) lift the brushes and disconnect the pigtails If choice B is selected set score to In figure "1" of the illustration, what type of circuit breaker trip element is featured? Illustration EL o (A) ambient compensated trip o (B) shunt trip o (C) magnetic trip (D) thermal trip If choice D is selected set score to As shown in figure "B" of the typical ground fault relay shown in the illustration, what statement concerning the leakage current setting adjustment is true? Illustration EL-0223 o (A) Setting the leakage current for too high a value may increase the likelihood of nuisance trips and setting the leakage current for too low a value may result in incidental damage due to a ground fault. (B) Setting the leakage current for too low a value may increase the likelihood of nuisance trips and setting the leakage current for too high a value may result in incidental damage due to a ground fault. o (C) Setting the leakage current for too high or too low a value may increase the likelihood of nuisance trips. o (D) Setting the leakage current for too high or too low a value may result in incidental damage due to a ground fault. If choice B is selected set score to In testing a hand-cranked megger prior to use, what statement is true? o (A) With the test leads shorted or open, the pointer should go to zero ohms. o (B) With the test leads shorted or open, the pointer should go to infinite ohms. (C) With the test leads shorted, the pointer should go to zero ohms, and with the tests leads open, the pointer should go to infinite ohms. o (D) With the test leads shorted, the pointer should go to infinite ohms, and with the tests leads open, the pointer should go to zero ohms. 8/30/2017 Page 16 of 43

17 U.S.C.G. Merchant Marine Exam Assistant Engineer-Limited Illustrations: As shown in figure "A" of the illustrated propulsion motor variable speed drive, what statement is true? Illustration EL-0140 o (A) both the bridge rectifier and the controller inverter bridge are thyristor controlled in terms of switching o (B) both the bridge rectifier and the controller inverter bridge are transistor controlled in terms of switching o (C) the bridge rectifier is uncontrolled and the controller inverter bridge is thyristor controlled in terms of switching (D) the bridge rectifier is uncontrolled and the controller inverter bridge is transistor controlled in terms of switching If choice D is selected set score to What type of AC motor would use a rheostat in the rotor circuit to vary the speed of the motor? o (A) synchronous motor o (B) regenerative braking motor o (C) squirrel-cage induction motor (D) wound-rotor induction motor If choice D is selected set score to Not only can a synchronous motor drive a load with greater efficiency than an induction motor, a fringe benefit of the synchronous motor is the ability for power factor correction. What statement is true? o (A) If the overall plant has a lagging power factor, the synchronous motor is over-excited. o (B) If the overall plant has a lagging power factor, the synchronous motor is normally-excited. (C) If the overall plant has a unity power factor, the synchronous motor is normally-excited. o (D) If the overall plant has a leading power factor, the synchronous motor is under-excited. 67. As shown in all four diagrams included in the illustration, what type of logic circuit is represented? Illustration EL-0226 o (A) OR gate (B) AND gate o (C) NAND gate o (D) NOR gate If choice B is selected set score to 1. 8/30/2017 Page 17 of 43

18 U.S.C.G. Merchant Marine Exam Assistant Engineer-Limited Illustrations: What are the operational characteristics of the split-phase motor shown in figure "A" of the illustration? Illustration EL-0215 o (A) The motor is reversible and dual-voltage, configured for high volts. o (B) The motor is non-reversible and dual-voltage, configured for low volts. (C) The motor is reversible and dual-voltage, configured for low volts. o (D) The motor is non-reversible and dual-voltage, configured for high volts. 69. Why must caution be exercised during the charging of lead-acid storage batteries? o (A) the acid will become weaker o (B) both plates are changing chemically to lead sulfate (C) hydrogen gas is being continuously liberated o (D) lead peroxide in the negative plate is poisonous 70. Concerning the illustrated motor controller circuit, where is the location of the motor "run" indicator light? Illustration EL-0004 o (A) At the local control station. (B) At the remote control station. o (C) There is no motor "run" light. It is, instead, a motor "stopped" light. o (D) At the motor. If choice B is selected set score to 1. 8/30/2017 Page 18 of 43

19 EL-0004 Adapted for testing purposes only from HALL, Practical Marine Electrical Knowledge, 2E Dennis T. Hall.. Reproduced with permission from Witherby Publishing Group, LTD. 2/23/2015 Page 19 of 43

20 EL-0014 Adapted for testing purposes only from HUNT, Modern Marine Engineer s Manual, Vol. II Cornell Maritime Press. Reproduced with permission from Cornell Maritime Press, a division of Schiffer Publishing, Ltd. 2/25/2015 Page 20 of 43

21 EL /1/2016 Adapted for testing purposes only Page 21 of 43

22 EL /1/2016 Adapted for testing purposes only Page 22 of 43

23 EL /9/2015 Adapted for testing purposes only from ROSENBURG/HAND. Electric Motor Repair Delmar Learning, a part of Cengage Learning, Inc. Reproduced with permission. Page 23 of 43

24 EL /1/2016 Adapted for testing purposes only Page 24 of 43

25 EL-0037 Adapted for testing purposes only from HALL, Practical Marine Electrical Knowledge, 2E Dennis T. Hall. Reproduced with permission from Witherby Publishing Group, LTD. 3/9/2015 Page 25 of 43

26 EL /2/2016 Adapted for testing purposes only Page 26 of 43

27 EL /6/2015 Adapted for testing purposes only from KILIAN. Modern Control Technology, 3E Delmar Learning, a part of Cengage Learning, Inc. Reproduced with permission. Page 27 of 43

28 EL /2/2016 Adapted for testing purposes only Page 28 of 43

29 EL /6/2015 Adapted for testing purposes only from HALL, Practical Marine Electrical Knowledge, 2E Dennis T. Hall. Reproduced with permission from Witherby Publishing Group, LTD. Page 29 of 43

30 EL /2/2016 Adapted for testing purposes only Page 30 of 43

31 EL /6/2015 Adapted for testing purposes only from HUNT, Modern Marine Engineer s Manual, Vol. II Cornell Maritime Press. Reproduced with permission from Cornell Maritime Press, a division of Schiffer Publishing, Ltd. Page 31 of 43

32 EL-0102 Adapted for testing purposes only from HUBERT, Operating, Testing and Preventive Maintenance of Electrical Power Apparatus Pearson Education. Reproduced with permission from Pearson Education, Inc. 4/13/2015 Page 32 of 43

33 EL-0114 Fire Detection and Alarm System Adapted for testing purposes only from SMITH, Modern Marine Electricity and Electronics Cornell Maritime Press. Reproduced with permission from Cornell Maritime Press, a division of Schiffer Publishing, Ltd. 7/7/2015 Page 33 of 43

34 EL /2/2016 Adapted for testing purposes only Page 34 of 43

35 EL-0120 Adapted for testing purposes only from HUBERT, Operating, Testing and Preventive Maintenance of Electrical Power Apparatus Pearson Education. Reproduced with permission from Pearson Education, Inc. 4/20/2015 Page 35 of 43

36 EL /2/2016 Adapted for testing purposes only Page 36 of 43

37 EL-0140 Adapted for testing purposes only from HALL, Practical Marine Electrical Knowledge, 2E Dennis T. Hall. Reproduced with permission from Witherby Publishing Group, LTD. 4/27/2015 Page 37 of 43

38 EL-0163 Adapted for testing purposes only from HALL, Practical Marine Electrical Knowledge, 2E Dennis T. Hall. Reproduced with permission from Witherby Publishing Group, LTD. 5/4/2015 Page 38 of 43

39 EL-0164 Adapted for testing purposes only from HALL, Practical Marine Electrical Knowledge, 2E Dennis T. Hall. Reproduced with permission from Witherby Publishing Group, LTD. 5/4/2015 Page 39 of 43

40 EL /18/2015 Adapted for testing purposes only from HUBERT, Operating, Testing and Preventive Maintenance of Electrical Power Apparatus Pearson Education Reproduced with permission from Pearson Education, Inc. Page 40 of 43

41 EL /18/2015 Adapted for testing purposes only from MILLER/MILLER, Industrial Electricity and Motor Controls McGraw-Hill Reproduced with permission from Westinghouse Corporation. Page 41 of 43

42 EL /26/2015 Figures A and B Adapted for testing purposes only from HERMAN, Industrial Motor Control 2010 Delmar Learning, a part of Cengage Learning, Inc. Reproduced with permission. Page 42 of 43

43 EL /26/2015 Adapted for testing purposes only from KILIAN, Modern Control Technology, 3E Copyright 2006 Delmar Learning, a part of Cengage Learning, Inc. Reproduced with permission. Page 43 of 43