Electrical and Electronics Engineering Mock Test

1. With the increase in the speed of a dc motor:

2. An electrical train employing a dc series motor is running at the fixed speed, when a sudden slight drop in the mains voltage occurs. This would result in:

3. When load is removed, .......motor will run at the highest speed.

4. A DC shunt motor is driving a constant torque load. On inserting an additional resistance in the armature circuit, the speed of the motor will:

5. The counter emf of dc motor

6. The output indicated on the name plate of any motor is always the:

7. The Ta/Ia graph of a dc series motor is a

8. The sole purpose of a commutator in a dc generator is to

9. The armature of a dc machine is made of____.

10. The yoke of a d.c. machine is made of ____.

11. In a dc generator, the generator, the generated emf is directly proportional to the

12. The induced emf in the armature conductors of a dc motor is

13. which of the following motor has the constant speed?

14. The rotor speed of a 6 pole 50Hz induction motor is 960 r.p.m. The percentage slip is ____.

15. When the supply voltage for an induction motor is reduced by 10%, the maximum running torque will be

16. In Fleming's right-hand rule, the thumb point towards

17. In DOL starter NC(Normally closed) contact is used as

18. A dc motor can be looked upon as dc generator with the power flow

19. When three phase induction motor is started with star-delta starter, during normal running condition, stator is connected

20. The rotor of an induction motor can't run at synchronous speed, if it did so then

21. The advantage of Autotransformer starter over stator resistance starter is

22. When three phase induction motor is started with star-delta starter, during starting stator is connected

23. A 4 pole, 440V, 50Hz induction motor is running at a slip of 4%. The speed of motor is ____.

24. If the input voltage and the frequency of supply is halved, to the 3-phase induction motor

25. The torque developed by three phase induction motor is approximately proportional to

26. If the supply freq of an induction motor is increased by 5%, the synchronous speed will

27. The constant 'k' in the torque equation of a 3 phase induction motor depends

28. A 4 pole, 50Hz induction motor runs at a speed of 1440rpm. The frequency of the rotor induced emf is _____.

29. Slip rings are usually made up of ___.

30. The direction of rotation of field in a 3-ph induction motor depends upon

31. Q. In DOL starter NO(Normally open) contact is used as

32. A DC series motor is best for driving

33. The value of slip is ___ at start.

34. When an induction motor is running at full load, rotor reactance is ------rotor resistance

35. When the direction of power flow in a differential compounded motor reverses, it will operate as a:

36. In 8 - pole wave connected motor armature, the number of parallel paths are

37. A flywheel is employed with a dc compound motor to reduce the peak demand, the compound motor should be:

38. The direction of the armature current in a dc motor is:

39. The maximum voltage is induced in the rotor of 3-ph induction motor when it----

40. In a DC series motor increasing the load current will

41. A 3-phase , 50 Hz , 4-pole squirrel cage induction motor has its stator rewound for 6 poles without any alternations in the rotor. The motor would now run at a speed

42. Thermal relays are used in DOL starter of Three Phase I.M. to

43. . The coupling field electrical and mechanical systems of dc machine is____.

44. If the back emf in a dc motor varnishes suddenly, then the motor:

45. A DC series motor is best suited for electrical traction because:

46. The real working part of a dc machine is the ___.

47. The output power of any electrical motor is taken from the:

48. Which of the following dc motor has maximum self relieving property:

49. Various methods for starting a three phase induction motor are given, which method will required six stator terminals

50. In DC machine, lap winding is used in

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