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DC Motors

DC Motors
Dc shunt motors are used for driving

Trains
Hoist
Machine tools
Cranes

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

Commutator
Rotor laminations
Pole shoes
End plates

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DC Motors
What will happen if the back emf of a dc motor vanishes suddenly?

The motor will stop
The motor will continue to run
The motor will run noisy
The armature may burn

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DC Motors
Motor starter are essential for

Preventing fuse blowing
Starting the motor
Avoiding excessive starting current
Accelerating the motor

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DC Motors
The resistance of shunt field winding as compared to series field winding is

The same
More
Less
None of the listed here

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DC Motors
The starting resistance of a DC motor is generally

Low
1000 Ω
Infinitely large
Around 500 Ω

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