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Electrical Machines

Electrical Machines
The speed of rotating magnetic field of 8 pole 50 Hz induction motor is

 750 rpm
 1000 rpm
 1500 rpm
 3000 rpm

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Electrical Machines
Hopkinss test in DC motor is conducted at ?

 No load.
  Full load.
 None of these.
 Low load.

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Electrical Machines
Which of following methods are suitable for the speed control of squirrel cage induction motor? 1. Voltage control. 2. Frequency control. 3. Pole changing method. 4. Rotor resistance control select the correct answer using the codes given below:-

 1, 3 and 4.
 2, 3 and 4.
  1, 2 and 3.
 2 and 4.

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

 commutation
 development of torque
 generation of voltage
 electromechanical energy conversion

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Electrical Machines
The frequency of voltage generated by an alternator having 8 poles and rotating at 250 rpm is

  60 Hz.
  25 Hz.
  16.67 Hz.
  50 Hz.

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Electrical Machines
Which motor cannot be started on no load?

 both B and C
 cumulative compound motors
 shunt motors
 series motors

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MORE MCQ ON Electrical Machines

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