electrical

Industrial Drives MCQ Questions and Answers Page - 1

1.

The selection of an electric motor for any application depends on which of the following factors?

Answer/ Hint      

Answer : D

Explanation :

2.

For a particular application the type of electric and control gear are determined by which of the following considerations?

Answer/ Hint      

Answer : D

Explanation :

3.

Which of the following motors is preferred for traction work?

Answer/ Hint      

Answer : B

Explanation :

4.

Which of the following motors always starts on load?

Answer/ Hint      

Answer : D

Explanation :

5.

_____________ is preferred for automatic drives.

Answer/ Hint      

Answer : C

Explanation :

6.

When the load is above ____________ a Synchronous motor is found to be more economical.

Answer/ Hint      

Answer : D

Explanation :

7.

The load cycle for a motor driving a power press will be ___________

Answer/ Hint      

Answer : D

Explanation :

8.

Light duty cranes are used in which of the following?

Answer/ Hint      

Answer : D

Explanation :

9.

While selecting an electric motor for a floor mill, which electrical characteristics will be of least significance?

Answer/ Hint      

Answer : D

Explanation :

10.

Which of the following motors are preferred for overhead travelling cranes?

Answer/ Hint      

Answer : C

Explanation :

11.

___________ is preferred for synthetic fibre mills.

Answer/ Hint      

Answer : B

Explanation :

12.

Ward-Leonard controlled DC drives are generally used for ___________ excavators.

Answer/ Hint      

Answer : D

Explanation :

13.

Which of the following motors is used fir elevators?

Answer/ Hint      

Answer : A

Explanation :

14.

Which part of a motor needs maximum attention for maintenance?

Answer/ Hint      

Answer : B

Explanation :

15.

_____________ need frequent starting and stopping of electric motors.

Answer/ Hint      

Answer : D

Explanation :

16.

Which feature, while selecting a motor for centrifugal pump, will be of least significance?

Answer/ Hint      

Answer : D

Explanation :

17.

____________ motor is a constant speed motor.

Answer/ Hint      

Answer : A

Explanation :

18.

The starting torque in case of centrifugal pumps is generally

Answer/ Hint      

Answer : A

Explanation :

19.

Which of the following motors are best for the rolling mills?

Answer/ Hint      

Answer : D

Explanation :

20.

___________ is not a part of ball bearing?

Answer/ Hint      

Answer : D

Explanation :

21.

The starting torque of a DC motor is independent of which of the following?

Answer/ Hint      

Answer : D

Explanation :

22.

Rotor of a motor is usually supported on  ____________  bearings.

Answer/ Hint      

Answer : A

Explanation :

23.

For which of the following applications DC motors are still preferred?

Answer/ Hint      

Answer : C

Explanation :

24.

In a paper mill where constant speed is required

Answer/ Hint      

Answer : C

Explanation :

25.

A reluctance motor _____________

Answer/ Hint      

Answer : D

Explanation :

26.

The size of an excavator is usually expressed in terms of

Answer/ Hint      

Answer : C

Explanation :

27.

For blowers which of the following motors is preferred?

Answer/ Hint      

Answer : C

Explanation :

28.

Belted slip ring induction motor is almost invariably used for

Answer/ Hint      

Answer : B

Explanation :

29.

Which of the following is essentially needed while selecting a moto?

Answer/ Hint      

Answer : B

Explanation :

30.

Reluctance motor is a  ___________

Answer/ Hint      

Answer : C

Explanation :

31.

______________   method of starting three phase induction motor needs six terminals.

Answer/ Hint      

Answer : A

Explanation :

32.

In ___________ method of staring 3-phase induction motors the starting voltage is not reduced.

Answer/ Hint      

Answer : C

Explanation :

33.

In jaw crushers a motor has to often start against ____________ load.

Answer/ Hint      

Answer : A

Explanation :

34.

For a motor-generator set which of the following motors will be preferred?

Answer/ Hint      

Answer : A

Explanation :

35.

Which of the following motors is usually preferred for kiln drives?

Answer/ Hint      

Answer : D

Explanation :

36.

Heat control switches are used in _____________ 

Answer/ Hint      

Answer : B

Explanation :

37.

____________ has relatively wider range of speed control.

Answer/ Hint      

Answer : D

Explanation :

38.

In squirrel cage induction motors which of the following methods of starting cannot be used?

Answer/ Hint      

Answer : A

Explanation :

39.

In which of the following applications the load on motor changes in cyclic order?

Answer/ Hint      

Answer : D

Explanation :

40.

Flame proof motors are used in

Answer/ Hint      

Answer : D

Explanation :

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