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DC Motors

DC Motors
A direct on line starter is used for starting motors

Upto 20 HP
Upto 15 HP
Upto 10 HP
Upto 5 HP

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

Become zero
Decrease
Increase
Remains same

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

Differentially compound motor
Series motor
Cummulative compound motor
Shunt motor

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DC Motors
The speed of a motor falls from 1100 r.p.m. at no-load to 1050 r.p.m. at rated load. The speed regulation of the motor is

6.77%
4.76%
8.85%
2.22%

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DC Motors
In a dc motor, the brushes are shifted from the mechanical neutral plane in a direction opposite to the rotation to _____

Decrease speed
Increase speed
Produce flat characteristics
Reduce sparking

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DC Motors
The power mentioned on the name plate of an electric motor indicates

The gross power
The power drawn in kVA
The output power available at the shaft
The power drawn in kW

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