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Electrical Machines

Electrical Machines
In a transformer zero voltage regulation is achieved at a load power factor which is

 lagging
 leading
 zero
 unity

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Electrical Machines
A 3-phase slip ring induction motor is wound for 4 poles on stator and 6 poles on the rotor. When 3-phase balanced voltage source at 50 Hz is applied, it will run at

 1500 rpm
 750rpm
 zero speed
 1000 rpm

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Electrical Machines
Which motor cannot be started on no load?

 cumulative compound motors
 shunt motors
 series motors
 both B and C

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Electrical Machines
In dc machines, the armature windings are placed on the rotor because of the necessity for

 commutation
 generation of voltage
 electromechanical energy conversion
 development of torque

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Electrical Machines
If the excitation of the synchronous generator fails, it acts as a/an

 induction motor.
 synchronous generator.
  induction generator.
 synchronous motor.

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Electrical Machines
Slip test is performed to determine

 positive sequence reactance and negative sequence reactance
All of these
 direct axis reactance and quadrature axis reactance
 slip

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MORE MCQ ON Electrical Machines

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