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Electrical Machines

Electrical Machines
If terminal voltage of one 1000 rpm shunt motor is reduced to half the speed of the motor will be

 500 rpm
 250 rpm
 2000 rpm
 1000 rpm

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Electrical Machines
The shaft of induction motor may be unbalanced due to

  uneven air gap.
  overheating of winding.
  overload.
  poor lubrication.

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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

 1000 rpm
 750rpm
 zero speed
 1500 rpm

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Electrical Machines
Which of the following motor is not suitable for frequent starting and stopping?

 Resistance split phase motor
 Capacitor run motor
 Capacitor split phase motor
All of these

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Electrical Machines
At stand still condition the value of slip is

 1
 finite value
 0
 infinite value

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Electrical Machines
The armature shaft must be able to withstand

 bending moment due to weight of the armature.
 twisting strains due to transmission of torque.
 any unbalanced magnetic pull on the armature core.
All of these

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MORE MCQ ON Electrical Machines

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