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DC Motors

DC Motors
In a dc motor constant torque is produced due to

Rotor laminations
End plates
Commutator
Pole shoes

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DC Motors
The direction of rotation of a D.C. series motor can be changed by

Interchanging supply terminals
None of these
Either of (A) and (B) above
Interchanging field terminals

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DC Motors
Dc shunt motors are used for driving

Cranes
Machine tools
Trains
Hoist

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DC Motors
One D.C. motor drives another D.C. motor. The second D.C. motor when excited and driven

None of these
Does not run as a generator
Runs as a generator
Also runs as a motor comes to stop after sometime

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DC Motors
The value of back emf in dc motor is maximum at

Full load
None of the listed here
No load
Half full load

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DC Motors
The armature torque of the D.C. shunt motor is proportional to

armature current only
both (A) and (B)
None of these
field flux only

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