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Electrical Machines

Electrical Machines
which of the following losses are negligible in blocked rotor test?

 iron loss
 copper loss
 both A and B
 mechanical loss

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Electrical Machines
What is the phase difference between two windings of A.C servomotor ?

 30°.
 120°.
 90°.
 60°.

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Electrical Machines
Which of the following motor has more stability

None of these
 cylindrical motor
 salient pole motor
 both motors has same stability

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Electrical Machines
In DC machine, the armature windings are placed on the rotor because of necessity for

 commutation.
 development of torque.
 electromechanical energy conversion.
 generation of voltage.

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Electrical Machines
Which one of the following statement is correct ? In an induction motor if the air gap is increased then

 its efficiency will improve
 its power factor will reduce
 its speed will increase
 its speed will reduce

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Electrical Machines
The output power indicated on the name plate of any motor is always the

 Power drawn in KW.
 Gross power.
 Power drawn in KVA.
 Output power at the shaft.

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MORE MCQ ON Electrical Machines

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