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DC Motors

DC Motors
The starting resistance of a DC motor is generally

Around 500 Ω
Infinitely large
Low
1000 Ω

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DC Motors
A dc motor can be easily identified by

Yoke
Winding
Size of conductor
Commutator

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DC Motors
The main disadvantage of the Ward-Leonard control method is

All of these
Low efficiency at high loads
High initial cost
High maintenance cost

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DC Motors
The compensating winding is connected in

Series with armature
None of the listed here
Series-parallel with armature
Parallel with armature

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DC Motors
Which one of the following is not the function of pole shoes in a D.C. machine?

To reduce the reluctance of the magnetic path
To support the field coils
To spread out flux for better uniformity
To reduce eddy current loss

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DC Motors
Small dc motors up to 5 HP usually have

4 poles
8 poles
2 poles
6 poles

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