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DC Motors

DC Motors
The mechanical power developed by a shunt motor will be maximum when the ratio of back emf to applied voltage is

0.5
2.0
4.0
1.0

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DC Motors
The shaft torque in a dc motor is less than total armature torque because of ______ in the motor.

Iron and friction losses
None of the listed here
Field losses
Cu losses

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DC Motors
If the speed of a dc shunt motor is increased the back emf of the motor will

Decrease
Remains same
Increase
Become zero

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DC Motors
The running speed of a dc series motor is basically determined by

Load
Armature reaction
Field excitation
None of the listed here

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DC Motors
D.C. generators are normally designed for maximum efficiency around

Full load
All of these
Rated voltage
Rated r.p.m.

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DC Motors
In the dc motor the iron losses occur in

Field
Commutator
Armature
Brushes

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