electrical

DC Motor MCQ Objective Questions and Answers Page - 5

1.

Which of the following dc motors will have least percentage  increase of input current, for the same percentage increase in torque ?

Answer/ Hint      

Answer : D

Explanation :

2.

Which of the following dc motors on removal of load will run at the maximum speed ?

Answer/ Hint      

Answer : A

Explanation :

3.

Which of the following dc motors has got maximum self relieving property

Answer/ Hint      

Answer : B

Explanation :

4.

The dc motor, that has poorest speed regulation is

Answer/ Hint      

Answer : C

Explanation :

5.

which motor should not be used for centrifugal pumps

Answer/ Hint      

Answer : B

Explanation :

6.

the ratio of the starting torque to full load torque is minimum in case of

Answer/ Hint      

Answer : B

Explanation :

7.

Which of the following dc motors has almost constant speed over their full load range?

Answer/ Hint      

Answer : A

Explanation :

8.

Which of the dc motors will have highest percentage increase of input current, for the same percentage increase in torque ?

Answer/ Hint      

Answer : B

Explanation :

9.

Which of the following dc motors has least drop in speed from no load to rated full load?

Answer/ Hint      

Answer : C

Explanation :

10.

A dc motor is to drive a load which is almost nil for certain part of the load cycle nad peak value for short duration. The most suitable dc motor is

Answer/ Hint      

Answer : D

Explanation :

11.

On switching a dc motor to dc supply mains it is found to rotate in the direction opposite to that for which it is designed. The dc motor is

Answer/ Hint      

Answer : A

Explanation :

12.

A motor used for punching machine is usually subjected to

Answer/ Hint      

Answer : D

Explanation :

13.

For continuously running rolling mills with  intermittent loading the most suitable dc drive is

Answer/ Hint      

Answer : D

Explanation :

14.

The speed of a dc motor depends upon

Answer/ Hint      

Answer : D

Explanation :

15.

The field flux method of speed control of dc shunt motor is generally used for which one of the following  ?

Answer/ Hint      

Answer : D

Explanation :

16.

The resistance of the field regulator of a dc shunt motor is of the order of

Answer/ Hint      

Answer : A

Explanation :

17.

The speed of a dc shunt motor can be raised above its rated value by

Answer/ Hint      

Answer : B

Explanation :

18.

Which of the following statements associated with field control of dc shunt motors is correct

Answer/ Hint      

Answer : C

Explanation :

19.

A dc shunt motor is supplying a load at its rated speed. The speed can be reduced by

Answer/ Hint      

Answer : A

Explanation :

20.

in a dc compound motor, 4-point starter is employed

Answer/ Hint      

Answer : C

Explanation :

21.

In a dc compound motor, 4-point starter provides

Answer/ Hint      

Answer : D

Explanation :

22.

A large dc shunt motor can be started preferably using a

Answer/ Hint      

Answer : A

Explanation :

23.

The simplest form of a motor controller is

Answer/ Hint      

Answer : B

Explanation :

24.

The most economical method  of electric braking is

Answer/ Hint      

Answer : D

Explanation :

25.

The electric braking system employed with dc shunt motors , in which the armature connections are reversed so that the motor tends to run in  opposite direction is called the ____braking

Answer/ Hint      

Answer : A

Explanation :

26.

Plugging of dc machine is normally executed by

Answer/ Hint      

Answer : B

Explanation :

27.

A dc shunt motor, running lightly at  1,000 rpm , is operated under plugging. With plugging connection left as it is the final speed of the motor will be

Answer/ Hint      

Answer : C

Explanation :

28.

In plugging of a dc shunt motor, the resistance is inserted in the armature circuit to

Answer/ Hint      

Answer : C

Explanation :

29.

The plugging provides _______ braking torque in comparison to rheostatic and regenerative braking systems

Answer/ Hint      

Answer : C

Explanation :

30.

The electric braking system commonly employed in rolling mills, elevators and  printing presses is

Answer/ Hint      

Answer : A

Explanation :

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DC Motor MCQ Objective Questions and Answers Page - 5