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Electrical Machines

Electrical Machines
When flux density is constant in a transformer, hysteresis loss varies as

 V
 f²
 f
 V²

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Electrical Machines
The air gap between the yoke and armature is dc machine is kept very small

All of these
 to avoid over heating.
 to achieve a stronger magnetic field.
 to avoid locking of the armature.

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Electrical Machines
Tappings of a transformer are provided

 at the phase end of lv side
 at the neutral side end of hv side
 at the phase end of hv side
 at the middle of hv side

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Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm. Find the rotor efficiency?

 94%
 96%
 95%
 92%

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Electrical Machines
The output power of any electrical motor is taken from the

 Coupling mounted on the shaft.
 Armature.
 Field.
 Motor frame.

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Electrical Machines
In induction motor wound rotor motor is mainly is used in application where

  less costly motor is not required.
 power factor is less.
  high starting torque.
  low starting torque.

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MORE MCQ ON Electrical Machines

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