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

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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

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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

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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

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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

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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

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

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