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DC Motors

DC Motors
Small dc motors up to 5 HP usually have

4 poles
8 poles
6 poles
2 poles

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DC Motors
A dc series motor is most suitable for

Pump
Punch presses
Lathes
Cranes

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

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

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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
Lenz's law
Faraday's law
Coloumb's law

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DC Motors
In a dc motor if the back emf is absent

Motor will run at very slow speed
Motor will not run at all
Motor will run at very high speed
Motor will burn

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DC Motors
The rheostatic speed control method is very

Unsuitable for rapidly changing loads
Economical
Suitable for getting speeds above the normal
Efficient

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