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DC MOTORS

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

Differentially compound motor
Series motor
Cummulative compound motor
Shunt motor

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DC Motors
A dc series motor is that which

Has a poor torque
Can be started easily without load
Has its field winding consisting of thick wire and less turns
Has almost constant speed

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DC Motors
For starting a dc motor a starter is required because

It limits the speed of the motor
It limits the starting current to a safe value
It starts the motor
None of the listed here

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DC Motors
In dc machines fractional pitch winding is used

To increase the generated emf
To reduce the sparking
To reduce the generated emf
To improve cooling

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DC Motors
Which motor has the poorest speed control?

Differentially compounded motor
Cummulative compounded motor
Series motor
Shunt motor

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