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Electrician
Electrician Set-2
DC Motor
45

DC Motor MCQ with Answers

45) What reduces the cross sectional area of core material for VA rating?

Dynamo sheet

Low alloy sheet

High alloy sheet

Normal steel sheet

Answer is:

High alloy sheet

DC Motor MCQ with Answers

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Related DC Motor MCQ with Answers

46) How to obtain opposite polarity in adjacent poles of a 4 pole DC motor?

Varying the number of turns in coil

Making series connection of coils

Making parallel connection of coils

Making current flow in different direction

Answer is:

Making current flow in different direction

47) Which insulating material used in winding is a highly non -hygroscopic and possess good electrical strength?

Empire cloth

Triplex paper

Millinex paper

Leatheroid paper

Answer is:

Millinex paper

48) Calculate the average pitch (Y_A) for retrogressive wave winding, if No. of armature conductor = 14 No. of slots = 7 No. of poles = 2

4

6

8

14

Answer is:

6

49) Why the newly rewound armature must be preheated before varnishing?

Drive out the moisture from it

Help for quick drying of varnish

Make easy to penetrate varnish inside

Maintain uniform spreading of varnishing

Answer is:

Drive out the moisture from it

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