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Electrical Machines

Electrical Machines
Iron losses in a DC machine are independent of variation in

  load.
  speed and voltage.
  voltage.
 speed.

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Electrical Machines
If in a sub – station there is one 132 / 33 kV transformer whose secondary is connected with primary of one 33 / 11 kV transformer, the total transformation ratio of the sub – station will be,

 7.
  12.
 4.
 3.

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Electrical Machines
In dc machines, the armature windings are placed on the rotor because of the necessity for

 generation of voltage
 electromechanical energy conversion
 commutation
 development of torque

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Electrical Machines
In induction motors, there is large decrease in maximum power factor when the dispersion coefficient is ________________.

 remains same.
 decreased.
 kept constant to certain value.
  increased.

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Electrical Machines
DC Shunt Motor has disadvantage(s) of

 none of above.
 constant speed.
 not suitable for rapidly changing loads.
 less expensive.

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Electrical Machines
Reluctance and hysteresis motors are the types of which electrical motor?

 DC motor.
 3 - Φ induction motor.
 Stepper motor.
  1 - Φ synchronous motor.

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