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DC Motors

DC Motors
Small dc motors up to 5 HP usually have

6 poles
8 poles
2 poles
4 poles

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DC Motors
Which of the following motor has the poorest speed regulation?

Cummulative compound motor
Differentially compound motor
Series motor
Shunt motor

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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%
1
Anywhere between 75% and 90%

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DC Motors
The back emf in a dc motor ______

Aids the applied voltage
None of the listed here
Opposes the applied voltage
Aids the armature current

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DC Motors
The plugging gives the

Highest torque braking
Smallest torque braking
Zero torque braking
None of the listed here

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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

Under compounded
Differentially compounded
Cumulatively compounded
Level compounded

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