D.C. Motors MCQs
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D.C. Motors MCQs
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25 Questions

1. Differentially compound D.C. motors can find applications requiring
2. The mechanical power developed by a shunt motor will be maximum when the ratio of back e.m.f. to applied voltage is
3. In variable speed motor
4. Which of the following steps is likely to result in reduction of hysteresis loss in a D.C. generator?
5. For which types of D.C. motor, dynamic braking is generally used?
6. Which motor should not be started on no-load?
7. If I2 be the armature current, then speed of a D.C. shunt motor is
8. The speed of a D.C. shunt motor is required to be more than full load speed. This is possible by
9. Which of the following motors is usually used in household refrigerators?
10. D.C. motor is to drive a load which has certain minimum value for most of the time and some peak value for short duration. We will select the
11. A three point starter is considered suitable for
12. Which of the following load normally needs starting torque more than the rated torque?
13. For the same H.P. rating and full load speed, following motor has poor starting torque
14. In case the conditions for maximum power for a D.C. motor are established, the efficiency of the motor will be
15. The speed of a D.C. shunt motor can be increased by
16. The total losses in a well designed D.C. generator of 10 kW will be nearly
17. Which D.C. motor will be suitable along with flywheel for intermittent light and heavy loads?
18. Which of the following loss in a D.C. generator is dissipated in the form of heat?
19. For constant torque drive which speed control method is preferred?
20. For which of the following applications a D.C. motor is preferred over an A.C. motor?
21. Which D.C. motor is generally preferred for cranes and hoists?
22. The purpose of retardation test on D.C. shunt machines is to find out
23. Where D.C. motor of H.P. 12 or more requires frequent starting, stopping, reversing and speed control
24. In case the back e.m.f. and the speed of a D.C. motor are doubled, the torque developed by the motor will
25. The main disadvantage of the Ward-Leonard control method is

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