Page 800 - Basic Electrical Engineering
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b. An over-excited synchronous motor draws leading power factor current
c. At normal excitation the current drawn by a synchronous motor is the minimum
d. At normal excitation the power factor of the current drawn is unity.
15. In alternators damper windings are used to
a. prevent hunting
b. reduced eddy current loss
c. reduce armature reaction
d. reduce both eddy current and hysteresis loss.
16. An infinite busbar should maintain
a. infinite frequency but constant voltage
b. constant voltage at constant frequency
c. constant voltage at variable frequency
d. constant voltage but should possess infinite length.
Answers to Multiple Choice Questions
1. (b) 2. (b) 3. (c) 4. (c) 5. (d)
6. (c) 7. (b) 8. (b) 9. (b) 10. (b)
11. (a) 12. (d) 13. (c) 14. (a) 15. (a)
16. (b)
