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Electrical Engineering Objective Questions { Alternators }



64. Voltage regulation of an alternator is usually
A. equal to that of power transformer
B. much lower than that of a power transformer
C. much higher than that of a power transformer
D. equal to that of induction motor

65. In an alternator, the stator frame serves
A. to verticate the armature
B. to hold the armature stampings
C. to protect the whole machine
D. as a return path for the flux

66. For a given output steam turbo-alternators are much smaller is size than water turbine-alternators because
A. steam turbo-alternators are built with smaller capacities
B. steam turbo-alternators have long rotors
C. steam turbo-alternators run at high speed
D. all of the above

67. Alternator of a central power station will have
A. revolving field winding
B. revolving armature winding
C. either of the above
D. none of the above

68.  Non-salient pole type of rotor construction is usually provided in the alternators used in
A. hydropower stations
B. thermal power stations
C. either of the above
D. none of the above

69. In an alternator terminal voltage rise will be more
A. when leading load is thrown off
B. when lagging load is thrown off
C. when unity power factor load is thrown off
D. none of the above

70.  Turbo-alternators usually have
A. 12 poles
B. 8 poles
C. 4 poles
D. 2 poles

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