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DC MOTORS

DC Motors
These days dc motors are widely used in

Pumping sets
Electric traction
Machine shops
Air compressors

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DC Motors
Which of the following law can be used to determine the direction of rotation of dc motor?

Fleming's left hand rule
Coloumb's law
Lenz's law
Faraday's law

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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
A direct on line starter is used for starting motors

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

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DC Motors
If a dc motor is comnected across the AC supply it will

Not run
Burn due to heat produced in the field winding by eddy currents
Run at lower speed
Run at normal speed

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