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Electrical Machines

Electrical Machines
A 220 V DC generator is run at full speed without any excitation. The open circuit voltage will be

  about 50 V.
  about 2 V.
  220 V.
  zero.

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Electrical Machines
In a DC generator, if P be the number of poles and N be the rpm of the rotor, then frequency of magnetic reversals will be

 PN/60.
 PN/120.
 PN/3000.
 PN/2.

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Electrical Machines
The reduced air gap results in an increase

  breaking torque.
  cost of operation.
  power factor.
  starting torque.

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Electrical Machines
In a 3 - Φ IM in order to eliminate cogging the number of stator slots must be

  either (B) or (C).
  unequal to number of rotor slots and skewed in shape.
  equal to number of rotor slots.
  an integral multiple of number of rotor slots.

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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
 1000 rpm
 zero speed

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Electrical Machines
Universal motors are used in

All of these
 food processing
 cranes
 traction

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MORE MCQ ON Electrical Machines

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