ELECTRICAL MACHINES QUIZ

If an additional resistance is connected in series with a DC motor operating at rated speed, the speed of the motor will

Reduce.

Remain unaltered.

Increase.

Oscillate around the normal speed.

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YOUR ANSWER : ?

In shapers and slotters which motor are preferred?

Slip ring IM.

Synchronous motor.

Squirrel cage IM.

Double cage motor.

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A 2 KVA transformer has iron loss of 150 W and full load copper loss of 250 W. The maximum efficiency of the transformer would occur when the total loss is

500 W

250 W

300 W

400W

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A lap wound 4 pole dc motor has 460 conductors. Find the number of parallel paths between the conductors?

4.

2.

6.

data provided is insufficient.

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The wattage rating of a ceiling fan motor will be

50 - 150 W.

250 - 500 W.

200 - 250 W.

10 - 20 W.

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When operating, two or more transformers in parallel, % impedance of these transformers should be

same.

inversely proportional to MVA rating of transformers.

such that actual impedance of all transformers would be same.

proportionate to MVA rating of transformers.

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Damper winding is used to

suppress the hunting.

both 1 and 2.

increase the load current.

decrease the load current.

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The direction of rotation of conductor of a DC motor can be determined by

Fleming's left hand rule.

Ampere law.

Lenz's law.

Fleming's right hand rule.

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What type of dielectric material is used in capacitors used for fans and for power factor correction?

Oil impregnated paper.

Vacuum.

Glass.

Mica.

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The direction of rotation of a DC motor can be determined by

Ampere's law.

Fleming's right hand rule.

Fleming's left hand rule.

Lenz's law.

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YOUR ANSWER : ?

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