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Electrical Machines

Electrical Machines
Lamination of transformer core is made of

 wrought iron.
 cast steel.
  cast iron.
  silicon steel.

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Electrical Machines
When a transformer is loaded, the secondary terminal voltage drops. That means power factor is

 zero.
 leading.
  lagging.
 unity.

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Electrical Machines
There are two 2-pole DC machines. Main field axis of machine A is horizontal and that of B is vertical. It is preferable to purchase

 machine B
 any of the two machines
 none of these
 machine A

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Electrical Machines
In DC generator, lap winding is used in

 where constant speed is required.
 high voltage and low current applications.
 where greater load is connected.
  high current and low voltage applications.

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Electrical Machines
If the field of a dc shunt motor gets opened while the motor is running, then the

 motor will attain dangerously high speed
 armature current will drop
 armature will oscillate about original speed as the mean speed
 motor will become slow.

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Electrical Machines
A 4 pole dc generator is running at 1500 rpm the frequency of current in the armature winding is

 200Hz.
 150Hz.
 100Hz.
 50Hz.

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MORE MCQ ON Electrical Machines

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