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Electrical Machines

Electrical Machines
The maximum power developed in cylindrical synchronous machine is occurs at a load angle of

 Greater than 90o.
 90o.
 less than 90o.
 0o.

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Electrical Machines
Tertiary winding in a transformer is mostly

 star connected.
  delta connected.
 zig - zag star connected.
 zig - zag delta connected.

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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
 1000 rpm
 1500 rpm
 750rpm

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Electrical Machines
The power input to a 3 - φ induction motor is 60 kW and stator loss is 1 kW the rotor cu loss per phase is

  slip X 50 / 3.
 1.
  slip X 69 / 3.
  slip X 59 / 3.

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Electrical Machines
The leakage reactance of a 3-phase alternator is determined by performing

 open circuit and zero power factor tests.
 short circuit and slip tests.
 zero power factor and slip tests.
 open circuit and short circuit tests.

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

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

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MORE MCQ ON Electrical Machines

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