C6

1 Electric propulsion coupling excitation is reduced at slow speed to ________ .

2An electric tachometer receives the engine speed signal from a_______

3Moisture as a result of condensation occurring inside of the cargo winch master switches, can be reduced by______ .

4Which of the following conditions will occur if the solenoid coil burns on a cargo winch with an electrical brake?

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

6Which of the following statements represents an application of a silicon controlled rectifier?

7Autotransformer starters or compensators are sometimes used with polyphase induction motors to_______ .

8Which of the listed devices is used to measure pressure and convert it to an electrical signal?

9 The frequency output of an operating alternator is controlled by the________.

10 Line losses in a distribution circuit are kept to a minimum by _____.

11A change in field excitation of an alternator operating in parallel will cause change in its _____.

12Which of the following statements describes the significance of ambient temperature in relation to the service life of electronic components?

13 Two AC generators of the same capacity are operating in parallel. One with zero speed droop setting and the other with a 5% speed droop. If its capacity is not exceeded, the unit whose governor has a zero speed droop setting will ____.

14An adjustable resistor, whose resistance can be changed without opening the circuit in which it is connected, is called a ____.

15Which of the listed conditions describes the effect on intrinsic semiconductor operation as a result of a temperature increase?

16As an armature revolves within a magnetic field, friction is developed between the rotated magnetized particles as they pass though each magnetization cycle. This results in ____.

17A device used in an electrical circuit to change alternating current to direct current, is known as a______.

18A silicon controlled rectifier (SCR) is a solid state device used to change_______.

19Which of the following actions must be carried out prior to closing the alternator circuit breaker?

20 The arc resulting from the tripping of a circuit breaker is prevented from damaging the contacts by _____.

21Which of the following represents a characteristic of an ungrounded electrical distribution system?

22When two generators are operating in parallel, what will first occur if the engine driving generator #1 suddenly loses power?

23 Regarding and AC generator connected to the main electrical bus; as the electric load and power factor vary, a corresponding change is reflected in the generator armature reaction. These changes in armature reaction are compensated for by the ____.

24 For practical purposes, in a simple series circuit employing two resistors, a drop of one half the source voltage will occur across one resistor if it has _____.

25 The mandatory operating characteristic of a pure amplifiers the______. I. Form of the input and output energy must be the same II. Ratio of the output change to input change must be a value greater than 1(one)

26An alternator is being paralleled with one on the line. At the INSTANT the circuit breaker is closed, the frequency of the incoming alternator will normally ____.

27As load is added to an AC generator provided with constant field excitation, the prime mover slows down with the effect of ___.

28 The existing resistance of conductor is dependent upon its length, cross‐sectional area ____.

29Although saturable reactors are extremely useful in some applications, their gain is low because of _____.

30 The resistance of a conductor varies ______.

31A resistor placed in parallel to the output of a power supply______.

32 You have installed a Zener diode in parallel with a load. While measuring the voltage across the Zener diode it is found that it does not change as the current through the load increases. This means that the Zener diode_______.

33 The heating conductors as a result of resistance in a distribution circuit causes a power loss expressed as _____.

34 The timer element found in a reverse power relay obtains it operating torque via ___

35Materials that retain a large part of their magnetization, after the magnetizing force is removed, are said to have ______.

36A current‐carrying conductor makes accidental contact with a wiring conduit. This will be indicated by a ___.

37AC generator are protected against malfunctions due to prime mover power loss by the use of ____.

38Nickel‐cadmium batteries are superior to lead‐acid batteries at high discharge rates because they ____.

39A switchboard for an AC electrical system requires the use of which of the following devices? Frequency meter

40Alternating current circuits develop resistance, inductance and capacitance. The inductance of a coil is expressed in _____.

41 The timer element of a reverse power relay cannot be energized unless ___.

42 The purpose of a magnetic relay is to ______.

43 Inductance is the property of an electric circuit that _____.

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

45 If a shipboard AC generator experiences voltage failure, the cause may be due to ____.

46Motorization of an AC generator is undesirable because ____.

47An autotransformer is equipped with a 50% tap, a 65% tap and an 80% tap. Which of the following statements is true concerning a load connected to 50% tap?

48 The amount of voltage induced in the stator windings of a modern AC generator depend mainly on ____.

49 Silicon diodes which are designed for a specific reverse breakdown voltage, and are most often used in electronic power supply voltage regulators, are called________.

50 The purpose of the automatic bus transfer is to ____.