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ITI
Electrician
Electrician Set-1
DC Motors
39

DC Motors MCQ - Electrician (Set-1) with Answers

39) The back emf of a DC motor depends on the :

shape of the conductor

field flux

commutator segments

brush material

Answer is:

field flux

DC Motors MCQ - Electrician (Set-1) with Answers

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Related DC Motors MCQ - Electrician (Set-1) with Answers

40) Calculate the back e.m.f. of a 220 V, D.C Shunt motor. Armature resistance is 0.5 ohm, and armature current is 40 A ?

220 V

210 V

200 V

190 V

Answer is:

200 V

41) A 220 V D.C. motor having an armature resistance of 0.2 ohm and back emf 215 V, It draws a current of :

15 amps

20 amps

25 amps

50 amps

Answer is:

25 amps

42) The armature resistance of a DC machine will be in the order of :

750 to 1000 ohms

500 to 750 ohms

10 to 50 ohms

0.1 to 1 ohm

Answer is:

0.1 to 1 ohm

43) 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 ?

1/2 of the original length

1/3 of the original length

3/4 of the original length

2/3 of the original length

Answer is:

1/3 of the original length

DC Motors MCQ - Electrician (Set-1) with Answers

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