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Electrical Machines

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

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

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Electrical Machines
When the mechanical power is developed by a DC motor maximum

 back emf is equal to applied voltage.
  Back emf is equal to half of applied voltage.
 None of above.
 Back emf is equal.

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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

 zero speed
 1500 rpm
 1000 rpm
 750rpm

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Electrical Machines
In double cage induction motor, the inner cage offers

  high resistance and low reactance.
  high resistance and high reactance.
  low resistance and high reactance.
  low resistance and low reactance.

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Electrical Machines
Induction motor operation depends on

 rotating magnetic field.
 either of these.
None of these
 stationary magnetic field.

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Electrical Machines
If the field of a dc shunt motor gets opened while the motor is running, then the

 armature current will drop
 motor will attain dangerously high speed
 motor will become slow.
 armature will oscillate about original speed as the mean speed

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