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DC Motors

DC Motors
The maximum end play of a motor is about

2 mm
0.4 mm
6 mm
10 mm

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DC Motors
Compensating winding in a dc machine is placed

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

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

Increase
Decrease
Remains same
Become zero

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DC Motors
In case the conditions for maximum power for a D.C. motor are established, the efficiency of the motor will be

Around 90%
Less than 50%
Anywhere between 75% and 90%
1

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DC Motors
If a dc motor is to be selected for conveyors, which motor would be preferred?

Series motor
Differentially compound motor
Cummulative compound motor
Shunt motor

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DC Motors
Excessive sparking at brushes may be caused due to

Misaligment of machine
Loose coupling
Dirt on the commutator
Worn bearings

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