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DC Motors

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

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

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DC Motors
The direction of rotation of a D.C. series motor can be changed by

Either of (A) and (B) above
Interchanging field terminals
Interchanging supply terminals
None of these

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DC Motors
Small dc motors up to 5 HP usually have

6 poles
8 poles
4 poles
2 poles

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DC Motors
When two dc series motor are commected in parallel, the resultant speed is

More than the normal speed
Normal speed
Zero
Loss than the normal speed

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

Differentially compound motor
Series motor
Shunt motor
Cummulative compound motor

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DC Motors
The speed of a series motor at no load is

4000 rpm
2000 rpm
1000 rpm
Infinity

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