EN-IEB_AEN_OE1_1

1.In a simple series circuit, the entire source voltage will drop across

2.Which of the following conditions can lead to the failure of a resistor?

3.Before testing insulation with a megohmmeter, the windings of large machines should be grounded for about 15 minutes just prior to the test, because the

4.A megohmmeter is connected to each end of an individual motor winding A low ohm reading indicates

5.When a megohmmeter is used to test the dielectric strength of wire insulation, the initial dip of the pointer toward 'zero' is caused by

1. the resistor next to the negative terminal nmlkj2. a short circuit nmlkj3. the resistor next to the positive terminal nmlkj4. an open circuit nmlkj

1. Excessive vibration nmlkj2. Insufficient ventilation nmlkj3. Corrosion nmlkj4. All of the above nmlkj

1. static charge of the machine may give a false reading nmlkj2. armature will have a greater number of leakage paths nmlkj3. insulation may be damaged nmlkj4. insulation may be covered with moisture nmlkj

1. an open coil nmlkj2. a loose coil nmlkj3. good continuity nmlkj4. a dirty coil nmlkj

1. good insulation nmlkj2. the leakage of current along the surface of dirty insulation nmlkj

6.The multiple prefix 'kilo' means

7.An accidental path of low resistance, allowing passage of abnormal amount of current is known as a/an

8.A grounded switch or cable will be indicated by a megohmmeter reading of

9.The combined effect of inductive reactance, capacitive reactance, and resistance in an AC series circuit is known as

10.AC circuits develop resistance, inductance, and capacitance The inductive reactance of a circuit is expressed in

3. the capacitance of the circuit nmlkj4. the dielectric absorption effect of the insulation nmlkj

1. thousand (10 to the 3rd power) nmlkj2. million (10 to the 6th power) nmlkj3. billion (10 to the 9th power) nmlkj4. trillion (10 to the 12 power) nmlkj

1. open circuit nmlkj2. short circuit nmlkj3. polarized ground nmlkj4. ground reference point nmlkj

1. infinity nmlkj2. 'zero' nmlkj3. being unsteady in the high range nmlkj4. being unsteady in the low range nmlkj

1. reactance nmlkj2. total reactance nmlkj3. impedance nmlkj4. resonance nmlkj

11.When a megohmmeter is used to test insulation, the gradual rise of the pointer reading as a result of continued cranking, is caused by

12.When using a megohmmeter to test insulation, good insulation will be indicated by

13.When electrical cables penetrate watertight bulkheads,

14.The multiple prefix 'tera' (T) means

1. ohms nmlkj2. mhos nmlkj3. henrys nmlkj4. farads nmlkj

1. good conductor resistance nmlkj2. the leakage of current along the surface of dirty insulation nmlkj3. the inductive reactance of the windings nmlkj4. the dielectric-absorption effect of the insulation nmlkj

1. slight kicks of the needle down scale nmlkj2. a downward dip followed by a gradual climb to the true resistance value nmlkj3. a gradual rise in the pointer reading at the outset nmlkj4. the initial dip of the pointer nmlkj

1. they should be grounded on either side of the bulkhead nmlkj

2. they must be bent to a radius of six diameters nmlkj

3. a watertight stuffing tube capable of accepting packing should be employed nmlkj

4. they should be secured by a clamp nmlkj

1. thousand (10 to the 3rd power) nmlkj2. million (10 to the 6th power) nmlkj3. billion (10 to the 9th power) nmlkj4. trillion (10 to the 12th power) nmlkj

15.Most conducting materials such as copper, aluminum, iron, nickel, and tungsten

16.The final step in testing a circuit for a ground involves the use of a megohmmeter A grounded switch or cable will be indicated by a megohmmeter reading of

17.Which of the following statements is true concerning the cleaning of electrical contacts?

18.The multiple prefix 'mega' (M) means

19.To minimize magnetic field interaction between electrical conductors in physical proximity, it is best to keep them

1. increase in resistance with increased temperature nmlkj2. increase in resistance with decreased temperature nmlkj3. decrease in resistance with increased temperature nmlkj4. increase in conductance with increased temperature nmlkj

1. 'zero' nmlkj2. infinity nmlkj3. steady in the high range nmlkj4. unsteady in the low range nmlkj

1. Compressed air should be used to blow out metallic dust. nmlkj2. Magnetic brushes should be used to remove metallic dust. nmlkj3. The contact surfaces should be greased to increase contact resistance. nmlkj4. Delicate parts should be cleaned with a brush and an approved safety solvent. nmlkj


1. parallel and as close as possible to each other nmlkj2. at right angles and as close as possible to each other nmlkj3. parallel to and as far as practicable from each other

20.Capacitors are used on the output of the power supply in today's consoles to

21.Reversing the current flow through a coil will

22.The total resistance of a parallel circuit is always

23.The sub-multiple prefix 'milli' (m) means

24.When a solid-state component of an electronic circuit is mounted to a metallic mass, the general purpose of that mass is to

nmlkj4. at right angles and as far as practicable from each other nmlkj

1. filter out 'ripple' nmlkj2. prevent overloads nmlkj3. act as a permanent load nmlkj4. decrease the average value of the output voltage nmlkj

1. reduce the amount of flux produced nmlkj2. have no effect on the eddy currents produced nmlkj3. reduce the power consumed nmlkj4. reverse its two-pole field nmlkj

1. larger than the greatest branch resistance nmlkj2. smaller than the lowest branch resistance nmlkj3. equal to the sum of the individual branch resistances nmlkj4. one-half the sum of the individual branch resistances nmlkj

1. one thousandth (10 to the -3rd power) nmlkj2. one millionth (10 to the -6th power) nmlkj3. one billionth (10 to the -9th power) nmlkj4. one trillionth (10 to the -12th power) nmlkj

25.The purpose of a main switchboard circuit breaker's reverse-power trip is to

26.The sub-multiple prefix 'micro' (Greek letter 'mu') means

27.A capacitor can be tested using a megohmmeter or an ohmmeter If the meter is connected to a shorted capacitor, the meter pointer should

28.To carry out an insulation resistance test, one terminal of the megohmmeter should be connected to the winding, with the other terminal being connected to the

1. prevent vibration damage to delicate components nmlkj2. prevent mechanical damage to solid-state components nmlkj3. dissipate stray magnetic currents nmlkj4. act as a heat sink nmlkj

1. prevent main circuit overload nmlkj2. protect the circuit breaker blowout coil nmlkj3. prevent alternator motorization nmlkj4. prevent low voltage tripout nmlkj

1. thousandth (10 to the -3rd power) nmlkj2. millionth (10 to the -6th power) nmlkj3. billionth (10 to the -9th power) nmlkj4. trillionth (10 to the -12th power) nmlkj

1. immediately swing to the maximum resistance value for the capacitor nmlkj2. first swing quickly to 'zero', then gradually move up the scale as the capacitor charges nmlkj3. immediately deflect to and remain at zero nmlkj4. immediately swing to a high reading and then gradually decrease nmlkj

1. power supply nmlkj2. variable resistor nmlkj3. frame of the machine nmlkj4. armature nmlkj

29.When a megohmmeter is being used to test insulation resistance, current leakage along the surface of the insulation is indicated by the megohmmeter's pointer

30.Possible phase relationships between voltage and current in an alternating current circuit include which of the following conditions?

31.The sub-multiple prefix 'nano' (n) means

32.Grease coatings on electrical contact surfaces increase contact resistance and should be removed with a/an

33.The sub-multiple prefix 'pico' (p) means

1. dipping toward zero then raising slowly nmlkj2. continually rising as test voltage is applied nmlkj3. kicking slightly down scale as voltage is applied nmlkj4. fluctuating around a constant resistance reading nmlkj

1. Current and voltage may be in phase. nmlkj2. Current may lead the voltage. nmlkj3. Current may lag the voltage. nmlkj4. All of the above. nmlkj

1. thousandth (10 to the -3rd power) nmlkj2. millionth (10 to the -6th power) nmlkj3. billionth (10 to the -9th power) nmlkj4. trillionth (10 to the -12th power) nmlkj

1. small wire brush nmlkj2. compressed air jet nmlkj3. clean dry cloth nmlkj4. 10% solution carbon solvent and water nmlkj

1. thousandth (10 to the -3rd power) nmlkj2. millionth (10 to the -6th power) nmlkj

34.Which of the substances listed can be used to shield sensitive equipment from static magnetic fields?

35.Handheld phase sequence indicators are useful when

36.Hand-portable phase sequence indicators should be used when

37.The illustrated EL-0024 circuit is a

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3. billionth (10 to the -9th power) nmlkj4. trillionth (10 to the -12th power) nmlkj

1. Glass nmlkj2. Mica nmlkj3. Bakelite nmlkj4. Permeable iron nmlkj

1. preparing to parallel alternators nmlkj2. connecting lighting branch circuits nmlkj3. troubleshooting DC motors nmlkj4. connecting shore power lines to the ship nmlkj

1. installing a new synchroscope nmlkj2. preparing to make the shore power connection nmlkj3. replacing a defective solenoid nmlkj4. all of the above nmlkj

38.In a three-phase circuit, the phase voltages are

39.The resistance of most conducting materials will change as a result of temperature change The resistance of copper will

40.A resistor placed in parallel to the output of a power supply

1. megohm meter nmlkj2. Gauss meter nmlkj3. wheatstone bridge nmlkj4. germanium diode tester nmlkj

1. 120 apart nmlkj2. 160 apart nmlkj3. 180 apart nmlkj4. 360 apart nmlkj

1. increase as temperature decreases nmlkj2. decrease as temperature decreases nmlkj3. remain the same between 20F and 110F nmlkj4. remain the same between 68F and 230F nmlkj

41.With both ends of a three conductor cable disconnected and arranged without the conductors touching each other, an ohmmeter reading of 'zero' ohms between the ends of one conductor would indicate

42.An ohmmeter can be used to measure

43.Which of the meters listed should only be used after a circuit has been electrically disconnected?

44.To test fuses in an energized circuit, you should use a

1. is a temperature compensator nmlkj2. corrects power factor nmlkj3. prevents excessive currents nmlkj4. aids in output voltage regulation nmlkj

1. continuity nmlkj2. a partial ground nmlkj3. the resistance is infinite nmlkj4. a short circuit nmlkj

1. current flow in a circuit nmlkj2. voltage between two points in a circuit nmlkj3. circuit continuity nmlkj4. power nmlkj

1. Wattmeter nmlkj2. Frequency meter nmlkj3. Ammeter nmlkj4. Ohmmeter nmlkj

1. low voltage light bulb nmlkj2. megohmmeter nmlkj3. voltmeter nmlkj4. resistance meter nmlkj

45.In order to increase its range of measurement, a resistance would be placed in series with which of the following instruments?

46.The total voltage of a series circuit is the

47.What is the power consumed by 'R2' in the circuit illustrated EL-0020 if the supply is 24 volts and the resistance of R1 is 3 ohms, R2 is 4 ohms, and R3 is 5 ohms?

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1. DC voltmeter nmlkj2. DC ammeter nmlkj3. frequency meter nmlkj4. power factor meter nmlkj

1. sum of the individual voltage drops nmlkj2. total resistance divided by the total current nmlkj3. sum of the individual currents multiplied by the number of resistors nmlkj4. total current divided by the total resistance nmlkj

1. 16 watts nmlkj2. 20 watts nmlkj3. 24 watts nmlkj4. 28 watts nmlkj

48.What is the direction of current through the load resistor in the circuit shown in the illustration?

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49.When the current flow through a copper wire increases, its

50.The existing resistance of a conductor is dependent upon its length, cross-sectional area,

1. Always from point "Z" to the grounded end. nmlkj2. Always from the grounded end to point "Z". nmlkj3. It depends on the instantaneous polarity at point "W". nmlkj4. It cannot be determined without a directional ammeter. nmlkj

1. resistance will decrease nmlkj2. insulation will burn nmlkj3. temperature will increase nmlkj4. conductivity will increase nmlkj

1. temperature and insulation nmlkj2. material and insulation nmlkj3. resistive coefficient and material nmlkj4. material and temperature nmlkj

51.What is the power consumed by 'R3' in the circuit illustrated EL-0020 if the supply is 24 volts and resistance of R1 is 3 ohms, R2 is 4 ohms, and R3 is 5 ohms?

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52.Which of the following characteristics is most critical in determining the size of the cable to be used in a particular circuit?

53.If coil 'R1-R2' at the receiver of figure "A" shown in the illustration were in 180 degree error with respect to that of the transmitter, what corrective action should be taken?

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1. 12 watts nmlkj2. 20 watts nmlkj3. 24 watts nmlkj4. 48 watts nmlkj

1. voltage rating nmlkj2. weight per unit length nmlkj3. current rating nmlkj4. inductance per unit length nmlkj

54.If the length of a wire is halved and the cross-sectional area is doubled, the resistance will be

55.If many turns of an alternating current coil for a contactor become short circuited, the coil

56.A bus disconnect link is used to isolate

1. No action is necessary as this is proper operation. nmlkj2. Reverse the 60 Hz supply connections at 'R1' and 'R2'. nmlkj3. Interchange connections 'S1' and 'S2'. nmlkj4. Interchange connections 'S1' and 'S3'. nmlkj

1. quartered nmlkj2. unchanged nmlkj3. doubled nmlkj4. quadrupled nmlkj

1. temperature will drop nmlkj2. will probably burn out immediately nmlkj3. will continue to operate nmlkj4. will operate on reduced current nmlkj

1. one bus bar from another

57.The total power used up in a series circuit is

58.The total resistance of a parallel circuit is always

59.Which of the instruments listed should always be connected in series with a circuit?

60.An ammeter should be used to measure

61.Which of the following represents a characteristic of an ungrounded electrical distribution system?

nmlkj2. the generator circuit breaker from the bus nmlkj3. different phases from the equalizer connection nmlkj4. positive and negative buses from the neutral nmlkj

1. the sum of the powers used in each load (resistor) divided by the number of loads nmlkj2. the sum of the powers used in each load nmlkj3. always less than the power used in the smallest load nmlkj4. never more than the power used in largest load nmlkj

1. larger than that of the branch with the greatest resistance nmlkj2. smaller than that of the branch with the lowest resistance nmlkj3. equal to the sum of the individual branch resistances nmlkj4. equal to the sum of the individual branch resistances divided by the number of branches nmlkj

1. Ammeter nmlkj2. Megohmmeter nmlkj3. Wattmeter nmlkj4. Voltmeter nmlkj

1. the voltage between two points in a circuit nmlkj2. circuit continuity nmlkj3. current flow in a circuit nmlkj4. total or partial circuit resistance nmlkj

62.Which of the following materials is a good electrical insulator?

63.Cleaning of electrical insulation should be

64.A megohmmeter can be used to test for

65.Electrical insulation is classed by the

66.When replacing fuses, always make sure

1. Accidental contact between one line and ground does not cause an outage. nmlkj2. Double ground faults on different phases will not cause an outage. nmlkj3. Ground detection systems are unnecessary. nmlkj4. Accidental contact between one line and ground will always cause an outage. nmlkj

1. wood nmlkj2. silver nmlkj3. copper nmlkj4. gold nmlkj

1. done every six months nmlkj2. accomplished every 12 months nmlkj3. determined by need and not the calendar nmlkj4. performed whenever the electrician is not otherwise busy nmlkj

1. an open field coil nmlkj2. a shorted field pole nmlkj3. undercut mica nmlkj4. reversed polarity nmlkj

1. International Association of Electrical Manufacturers nmlkj2. approximate operating voltage and current expected nmlkj3. U.S. Coast Guard nmlkj4. temperature stability of the manufacturing material(s) nmlkj

67.Periodic testing of circuit breakers is necessary to assure that a correctly rated and properly installed unit

68.The need for insulation cleaning may be determined by

69.Four lamps are connected in parallel in a single circuit If one of the lamp burns out, the others will

70.A megohmmeter can be used to test for

1. to stand on a rubber mat and use rubber gloves nmlkj2. to use insulated pliers or screwdriver nmlkj3. the fuse clips are straight, tight, and in good contact nmlkj4. to increase the fuse rating 10% to guard against 'nuisance blowing' nmlkj

1. can trip faster as it increases in age nmlkj2. will continue to provide the original degree of protection nmlkj3. does not exceed its interrupting capacity nmlkj4. be able to withstand at least 125% of applied voltage nmlkj

1. visual inspection for dirt accumulation nmlkj2. high megger readings nmlkj3. low operating temperature nmlkj4. the time period since the last cleaning nmlkj

1. all go out nmlkj2. become dimmer nmlkj3. burn with their original intensities nmlkj4. become brighter nmlkj

1. an open field coil nmlkj2. synchronous speed nmlkj3. undercut mica nmlkj4. reversed polarity nmlkj

71.Capacitors can be used in electric distribution systems to improve power factor This is accomplished by seesawing energy between the capacitor and the

72.Which of the instruments listed is used to check insulation resistance?

73.A megohmmeter is used to measure

74.A 'dielectric' is a/an

75.A galvanometer is an instrument used to measure

1. generator nmlkj2. inductive loads nmlkj3. resistive loads nmlkj4. all of the above nmlkj

1. Magneto nmlkj2. Megohmmeter nmlkj3. Dynamometer nmlkj4. Rheostat nmlkj

1. voltage nmlkj2. insulation resistance values nmlkj3. current nmlkj4. power nmlkj

1. electrical insulator nmlkj2. current flow nmlkj3. good conductor nmlkj4. semiconductor material nmlkj

1. thickness of galvanized metal nmlkj2. resistance of electrical wiring insulation nmlkj3. very small amounts of current or voltage

76.A device which can be used to check the calibration of a circuit breaker is a

77.How is a wattmeter electrically connected in a circuit?

78.Which of the following statements represents the action of a megohmmeter when testing a small capacitor in good condition?

79.A wattmeter is used to determine

80.Which of the spaces listed is defined as a 'location requiring an exceptional degree of protection' when considering the installation of shipboard electrical equipment?

nmlkj4. quantity of galvans in an electric circuit nmlkj

1. 500 volt megohmmeter nmlkj2. portable low voltage high current testing unit nmlkj3. standard digital multimeter nmlkj4. clamp-on voltmeter nmlkj

1. In series nmlkj2. In parallel nmlkj3. In series-parallel nmlkj4. Inductively nmlkj

1. The meter pointer should immediately swing to the maximum resistance value for the capacitor. nmlkj2. The meter pointer should first swing quickly to zero and then gradually move up the scale as the capacitor

charges. nmlkj

3. The meter pointer should immediately swing to infinity and then drop in sharp jerks as the voltage increases.

nmlkj

4. The meter pointer should immediately swing to a high reading and gradually decrease. nmlkj

1. the power being consumed by electrical equipment nmlkj2. partial circuit resistance nmlkj3. current flowing in a circuit nmlkj4. voltage existing between two points in a circuit nmlkj

81.Which of the following statements represents the FIRST precaution to be taken prior to working on any installed electrical component?

82.All electric cables passing through watertight bulkheads must be

83.Which of the following statements concerning electrical cables is correct?

84.Which of the following precautions should be taken when a blown fuse, rated at 10 amperes, is replaced?

1. Machinery space nmlkj2. Chart room nmlkj3. Console room nmlkj4. Accommodation space nmlkj

1. Wear rubber gloves and boots. nmlkj2. Use only approved nonconducting tools. nmlkj3. Ground the case of the machine before beginning any repairs. nmlkj4. Open the supply circuits and tag the switches. nmlkj

1. installed with watertight stuffing tubes nmlkj2. grounded on both sides of the bulkhead nmlkj3. fitted with unions on each side of the bulkhead nmlkj4. welded on both sides of the bulkhead nmlkj

1. Where they pass through watertight bulkheads, they should be fitted with watertight stuffing boxes. nmlkj

2. Electric cable coverings should never be grounded. nmlkj

3. Electrical cables must be rigidly held in place by welding of armored cable, or glued in place where nonmetallic insulation is used.

nmlkj

4. All of the above. nmlkj

1. Short out the fuse before removing it from the circuit. nmlkj2. Use needle -nose pliers to remove fuse from the circuit. nmlkj3. Replace blown fuse with one of equal voltage and ampere capacity. nmlkj4. Fuses of 10 ampere rating and less are virtually harmless when energized and may be handled freely.

85.When maintenance personnel are working on electrical equipment, all supply switches should be secured in the open position and tagged specifically by the

86.When changing fuses, you should always

87.A ground can be defined as an electrical connection between the wiring of a motor and its

88.External shunts are sometimes used with ammeters to

89.The output voltage of a 440 volt, 60 hertz, AC generator is controlled by the

nmlkj

1. watch engineer nmlkj2. chief engineer or first assistant nmlkj3. chief electrician nmlkj4. person performing the repair nmlkj

1. wear rubber boots nmlkj2. use a fuse puller nmlkj3. stand on a rubber mat nmlkj4. wear safety glasses nmlkj

1. shunt field nmlkj2. circuit breaker nmlkj3. metal framework nmlkj4. interpole nmlkj

1. increase meter sensitivity nmlkj2. permit shunts with larger resistances to be utilized nmlkj3. prevent damage to the meter movement from heat generated by the shunt nmlkj4. enable the construction of a compact meter with a virtually unlimited range nmlkj

1. prime mover speed nmlkj

90.Any electric motor can be constructed to be

91.Where a thermal-acting breaker is required to be used in an area of unusually high, low, or constantly fluctuating temperatures, an ambient compensating element must be used This element consists of a

92.An accidental path of low resistance, allowing passage of abnormal amount of current is known as a/an

93.A resistance in a circuit of unknown value is to be tested using the voltmeter/ammeter method Therefore, the meters should be connected with

2. exciter output voltage nmlkj3. load on the alternator nmlkj4. number of poles nmlkj

1. short proof nmlkj2. ground proof nmlkj3. explosion proof nmlkj4. overload proof nmlkj

1. cylindrical spring on the contact arm nmlkj2. conical spring on the contact arm nmlkj3. second bimetal element nmlkj4. second electromagnet nmlkj

1. open circuit nmlkj2. short circuit nmlkj3. polarized ground nmlkj4. ground reference point nmlkj

1. both meters in series with the resistance nmlkj2. both meters in parallel with the resistance nmlkj3. the ammeter in series and the voltmeter in parallel with the resistance nmlkj4. the ammeter in parallel and the voltmeter in series with the resistance nmlkj

94.The purpose of a short circuit forcing module (short time trip) installed in a branch line is to provide

95.Which of the following electric motors would be the safest and most reliable to use on the main deck of a vessel in foul weather conditions?

96.Grounds occurring in electrical machinery as a result of insulation failure may result from

97.Fuses are rated in

98.Copper is often used as an electrical conductor because it

1. high speed clearance of low impedance short circuits in the branch nmlkj2. continuity of service on main bus under short circuit conditions in a branch nmlkj3. isolation of short circuits by selective tripping of branch circuit breakers nmlkj4. all of the above nmlkj

1. Sealed motors nmlkj2. Drip proof motors nmlkj3. Enclosed motors nmlkj4. Watertight motors nmlkj

1. deterioration through extended use nmlkj2. excessive heat nmlkj3. extended periods of vibration nmlkj4. all of the above nmlkj

1. voltage nmlkj2. amperage nmlkj3. interrupting capacity nmlkj4. all the above nmlkj

1. has high resistance at low temperatures nmlkj2. has a highly polished surface nmlkj3. is able to pass current with little opposition

99.The multiple prefix 'giga' (G) means

1. 1. 2. 3. 4.

2. 1. 2. 3. 4.

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nmlkj4. holds insulation together well nmlkj


nmlkj nmlkj nmlkj nmlkji


nmlkji nmlkj nmlkj nmlkj

nmlkj nmlkj nmlkji nmlkj



nmlkj nmlkji nmlkj nmlkj











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EN-IEB_AEN_OE1_1