electrician

MCQ ON DC MOTOR PAGE - 2

1.

by adding a variable resistance across the series field (field diverter) of a d.c series motor, speed above the normal speed can be achieved because

Answer/ Hint      

Answer : B

Explanation :

2.

if the field of a d.c shunt motor gets opened

Answer/ Hint      

Answer : C

Explanation :

3.

when an electric train moves down a hill the d.c. series motor then acts as:

Answer/ Hint      

Answer : C

Explanation :

4.

Which of the following motors is suitable for high starting torque

Answer/ Hint      

Answer : C

Explanation :

5.

Which of the following methods is most economical for funding the no load losses of a long shunt d.c. motor

Answer/ Hint      

Answer : B

Explanation :

6.

The rated speed of a given shunt motor is 1050 r.p.m to run this motor at 1200 r.p.m. Which of the following speed control scheme will be suitable

Answer/ Hint      

Answer : B

Explanation :

7.

Which of the following statement is more appropriate

Answer/ Hint      

Answer : D

Explanation :

8.

Which of the following motors is used to drive the constant speed line shafting lathes, blowers and fans

Answer/ Hint      

Answer : A

Explanation :

9.

You notice that a d.c. motor starts with jerk when starting the motor what may be the fault for this effect

Answer/ Hint      

Answer : C

Explanation :

10.

You speed of a d.c shunt motor of 3 kW is 2000 r.p.m when connected to a constant voltage supply. The speed is to be varied upto 2500 r.p.m What speed control method is to be used

Answer/ Hint      

Answer : D

Explanation :

11.

Starting  current of a 220V 10 HP, shunt motor having an armature resistance of 0.2 ohm, without starter is

Answer/ Hint      

Answer : B

Explanation :

12.

If the current in the armature of a d.c. series motor is reduced by 50% . the torque of the motor will become

Answer/ Hint      

Answer : B

Explanation :

13.

If the load and flux of a D.C motor are held constant, and the voltage applied across its armature is increased by 5 percent, the speed of the motor will…

Answer/ Hint      

Answer : A

Explanation :

14.

You have to change the defective motor of an electric locomotive. Which type of motor would you choose

Answer/ Hint      

Answer : C

Explanation :

15.
  1. You have to change the defective motor of an electric Locomotive

Which type of motor would you choose

Answer/ Hint      

Answer : C

Explanation :

16.

Motor used in electric traction is….

Answer/ Hint      

Answer : C

Explanation :

17.

For which one of the following applicaiotn DC series motor is used

Answer/ Hint      

Answer : D

Explanation :

18.

What would be the consequence of no load operation of DC series moto

Answer/ Hint      

Answer : C

Explanation :

19.

During the normal operation of a DC sere3is motor , if the field winding is suddenly open circuited, what will be effect on the motor

Answer/ Hint      

Answer : D

Explanation :

20.

Which type of motor would you choose for starting  the transport vehicles

Answer/ Hint      

Answer : A

Explanation :

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