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DC Motors

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

Pole shoes
End plates
Commutator
Rotor laminations

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DC Motors
Which D.C. motor is generally preferred for cranes and hoists?

Series motor
Shunt motor
Cumulatively compounded motor
Differentially compounded motor

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DC Motors
A dc series motor is that which

Has almost constant speed
Has its field winding consisting of thick wire and less turns
Can be started easily without load
Has a poor torque

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DC Motors
The commutating pole winding is connected in

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

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DC Motors
______ motor has the best speed regulation.

Series
Shunt
Differentially compounded
Cummulative compounded

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DC Motors
Which of the following losses are significantly reduced by laminating the core of a D.C. generator?

Copper losses
Hysteresis losses
Windage losses
Eddy current losses

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