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Electrical Machines

Electrical Machines
Maximum efficiency will occur, when copper loss is_______to iron loss?

 less than
 equal to
 greater than
 any of the above

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Electrical Machines
Reactive power generated or delivered significantly depends on

 frequency.
 load angle.
 excitation.
 both 1 and 2.

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Electrical Machines
Swinburne's test is applicable to

 DC shunt and level Compound motor.
 DC compound motor.
 DC series motor.
 DC Shunt motor.

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Electrical Machines
The supply voltage to an induction motor is reduced by 10%. By what percentage, approximately, will the maximum torque decrease?

 19%
 10%
 40%
 5%

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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?

 750.
 200.
 500.
  100.

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Electrical Machines
The demagnetising component of armature reaction in a DC generator

  reduces inter poles flux density.
  increases armature speed.
  results in sparking trouble.
  reduces generator emf.

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