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Electrical Machines

Electrical Machines
If direct axis reactance Xd and quadrature axis reactance Xq are equal, then reluctance power is

 minimum
 maximum
 zero
All of these

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Electrical Machines
If s is the slip and f is the supply frequency of an induction motor, the frequency of rotor current is given by

  sf / 2.
  sf.
  s2.
  f / s.

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Electrical Machines
A 250 V DC generator in run at rated speed with no excitation. The open circuit voltage will be

  zero.
  250 V.
  very small, say about 2 or 3 V.
 about 100 V.

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Electrical Machines
In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as

 3 to 5.
 2 to 3.
  1.5 to 2.
 1.0.

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Electrical Machines
A 100 KVA transformer is operating at 60 Hz, 240 V supply. The same transformer is operating at 50 Hz, 200 V supply. The new rating is

 100 KVA
 83.33 KVA
 123.3 KVA
 50 KVA

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Electrical Machines
Ratio of starting torque to full load torque is minimum in

  Shunt motor.
  Series motor.
  Cumulative compound motor.
  Differential compound motor.

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MORE MCQ ON Electrical Machines

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