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DC Motors

DC Motors
The maximum end play of a motor is about

10 mm
2 mm
6 mm
0.4 mm

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DC Motors
In a D.C. series motor, if the armature current is reduced by 50%, the torque of the motor will be equal to

10% of the previous value
25% of the previous value
50% of the previous value
100% of the previous value

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DC Motors
Compensating winding in a dc machine is placed

On yoke in the pole faces
On yoke in the interpolar gap
On armature
None of the listed here

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DC Motors
Three point starter can be used for

Series motor only
Compound motor only
Shunt motor only
Both shunt and compound motor

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DC Motors
When the speed of dc motor increases, its armature current

Increases
Remains same
Decreases
None of the listed here

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DC Motors
The mechanical power developed in a dc motor is maximum when back emf is equal to _____ the applied voltage.

Twice
One-third
Half
None of the listed here

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