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Electrical Machines

Electrical Machines
If the air gap of IM is increased, ____________ will increase.

  power factor.
  magnetizing current.
  air gap flux.
  speed.

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Electrical Machines
In a transformer the magnetic coupling between the primary and secondary winding can be increased by

 using soft material for winding.
 using transformer oil of better quality.
 using the magnetic core of low reluctance.
 increasing the number of turns.

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

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

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Electrical Machines
Two windings provided on the stator of 1-phase induction motor, one main winding and the other auxiliary winding are connected

 in series
 in parallel
 either of these depending on the design of the motor
 through inductive coupling

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Electrical Machines
In a DC Shunt Motor if the load current increases then field flux

 decreases
 remains constant.
 increases.
 decreases.

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Electrical Machines
For a transformer to be tested at full load conditions but consuming only losses from the main, we do

None of these
 load test
 back to back test
 OC and SC tests

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