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Electrical Machines

Electrical Machines
The flux involved in the emf equation of a transformer has

 rms value.
  maximum value.
 total value.
 average value.

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Electrical Machines
A dc shunt generator has full-load voltage regulation of 10% at rated speed of 1000 rpm. If it is now driven at 1250 rpm, then its voltage regulation at full load would

 be less than 10%
 be more than 10%
 remain unchanged
 be 12.5%

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Electrical Machines
A crusher is equipped with

 Synchronous motor.
 Reluctance motor.
 Slip ring induction motor.
 DC shunt motor.

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Electrical Machines
For small value armature current Ia the torque developed by a DC series motor is proportional to

  1/Ia.
  Ia.
  √Ia.
  Ia2.

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Electrical Machines
The noise resulting from vibrations of lamination set by magnetic forces, is termed as

  hum.
 magnetostriction.
 zoom.
 boo.

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Electrical Machines
The output indicate on the name plate of any motor is always the

 Power drawn in KW.
 Gross power.
 Power drawn in KVA.
  Output power at the shaft.

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