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Electrical Machines

Electrical Machines
If terminal voltage of one 1000 rpm shunt motor is reduced to half the speed of the motor will be

 1000 rpm
 500 rpm
 250 rpm
 2000 rpm

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Electrical Machines
Exciting current of an induction motor is

  none of these.
  lesser than power transformer.
  equal as power transformer.
  higher than power transformer.

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Electrical Machines
A 4 pole DC generator rotates at 1500 rpm. How many times in a second, will the emf induced in each armature conductor changes its direction?

 500.
  100.
 750.
 200.

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Electrical Machines
If a transformer has turns ratio K, the primary and secondary current are I1 and I2 respectively and magnetizing current and core loss component of no load current Iμ and Iw respectively, then

 I1 = KI2.
 I1 = KI2 + Iμ.
  I1 = KI2 + Iw + Iμ.ok
 I1 = KI2 + Iw.

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Electrical Machines
In which of the following generators negative voltage regulation can occur?

 series generators
 both B and C
 over compound generator
 shunt generator

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Electrical Machines
For larger units high torque it is preferred to use

 Slip induction motor.
 Partial motor.
 Universal motor.
 DC shunt motor.

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