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

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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

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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

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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

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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

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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

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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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