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Electrical Machines

Electrical Machines
For a dc machine shunt resistance and armature resistance values are

 high and high
 low and high
 high and low
 low and low

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Electrical Machines
A transformer has resistance and reactance in per unit as 0.01 and 0.04 respectively. Its voltage regulation for 0.8 power factor lagging and leading will be

 6% and -4%
None of these
 4.8% and -3.2%
 3.2% and -1.6%

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Electrical Machines
The stator frame in an induction motor is used to

  protect the whole machine.
  provide return path for the flux.
  hold armature stamping in position.
  ventilate the armature.

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Electrical Machines
Alternator operates on the principle of

  mutual induction.
  self or mutual induction.
  electromagnetic induction.
  self induction.

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Electrical Machines
A 4 pole DC shunt generator having a wave winding supplies 50 lamps, each of 60 W at 120 V. The armature and field resistance are 0.2 Ω and 60 Ω respectively. The current in each armature conductor is

  13.5 A.
 23 A.
 27 A.
 11.5 A.

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Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5Ω and back back emf 200 V is

 44 A.
 440 A.
 400 A.
  40 A.

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MORE MCQ ON Electrical Machines

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