electrician

MCQ ON DC MOTOR PAGE - 3

1.

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

Answer/ Hint      

Answer : A

Explanation :

2.

The back emf of a DC motor depends on the ……

Answer/ Hint      

Answer : B

Explanation :

3.

The E.M.F induced in a.D.C motor while running  is lo….

Answer/ Hint      

Answer : B

Explanation :

4.

Calculate the back e.m.f (Eb) of a 220 V DC shunt motor. Armature resistance is 0.5 ohm and armature current is 40 A

Answer/ Hint      

Answer : C

Explanation :

5.

A 220 V.D.C motor having an armature resistance 0.2 ohm and back and back emf 215 V, it draws a current of …

Answer/ Hint      

Answer : C

Explanation :

6.

The armature resistance of a DC machine will be in the order of …

Answer/ Hint      

Answer : D

Explanation :

7.

The carbon brushes of DC machines become shorter by wearing out during the running time of the machine At what length do you have to change the brushes

Answer/ Hint      

Answer : B

Explanation :

8.

The supply terminals of a.D.C shunt motor are reversed. What will be eh effect on the motor

Answer/ Hint      

Answer : C

Explanation :

9.

What will be the consequences if the field circuit of a DC shunt motor is opened when the motor is running at no load conditions

Answer/ Hint      

Answer : C

Explanation :

10.

To start a DC shunt motor the type of starter used is …..

Answer/ Hint      

Answer : B

Explanation :

11.

The connection of NVC in DC 3 point tarter is across DC supply in series with

Answer/ Hint      

Answer : D

Explanation :

12.

In a 3 point starter the No volt coil (NVC) is connected in series with …

Answer/ Hint      

Answer : D

Explanation :

13.

A.DC shunt motor connected through a 4 point starter starts normally when the starter handle is moved from OFF position to ON position. But the starter handle does not remain onion position. One of

Answer/ Hint      

Answer : B

Explanation :

14.

For which one of the following application D.C shunt motor is used

Answer/ Hint      

Answer : D

Explanation :

15.

The full load current of a 10 KW, 250 V.D.C motor will be…

Answer/ Hint      

Answer : D

Explanation :

16.

Which type of D.C motor is preferred for Elevators

Answer/ Hint      

Answer : C

Explanation :

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MCQ ON DC MOTOR PAGE - 3