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DC Motors

DC Motors
The maximum end play of a motor is about

6 mm
10 mm
2 mm
0.4 mm

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DC Motors
What will happen if the back emf of a dc motor vanishes suddenly?

The motor will run noisy
The motor will continue to run
The armature may burn
The motor will stop

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DC Motors
At the instant of starting when a D.C. motor is put on supply, it behaves like

A highly resistive circuit
None of these
A low resistance circuit
A capacitive circuit

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DC Motors
Armature reaction in dc motor is increased

When the armature current increases
When the armature current decreases
When the field current increases
By interpoles

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DC Motors
These days dc motors are widely used in

Machine shops
Air compressors
Pumping sets
Electric traction

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DC Motors
The compensating winding is connected in

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

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