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Electrical Engineering Objective Questions { Alternators }



8. The generator which gives dc supply to the rotor of an alternator is called
A. convertor
B. exciter
C. inverter
D. rectifier

9. In alternators, salient pole type rotors are generally used with prime movers of
A. high speed
B. low speed
C. medium speed
D. any speed

10. In alternators, cylindrical pole type rotors are generally used with prime movers of
A. high speed
B. los speed
C. medium speed
D. both low and high speeds

11. An alternator running at 1000 rpm generates voltage at 50 Hz. The number of poles on the alternator will be
A.2
B.4
C.6
D.8

12. As the speed of an alternator increases, the frequency
A. increases
B. decreases
C. phase sequence should be the same
D. all of these

13. An alternator is said to be overexcited when it is operating at
A. unity power factor
B. leading power factor
C. lagging power factor
D. either lagging or leading power factor

14. In an alternator, when the load increases, due to armature reaction the terminal voltage
A. drops
B. rises
C. remains unchanged
D. may drop or rise

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