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DC Motors

DC Motors
Dc shunt motors are used for driving

Machine tools
Trains
Cranes
Hoist

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

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

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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.

None of the listed here
Twice
One-third
Half

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DC Motors
In D.C. shunt motors as load is reduced

The speed will reduce
The speed will increase in proportion to reduction in load
The speed will remain almost/constant
The speed will increase abruptly

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DC Motors
For the same H.P. rating and full load speed, following motor has poor starting torque

Cumulatively compounded
Differentially compounded
Shunt
Series

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DC Motors
Flywheel is used with D.C. compound motor to reduce the peak demand by the motor, compound motor will have to be

Cumulatively compounded
Under compounded
Level compounded
Differentially compounded

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