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Electrical Machines

Electrical Machines
For the purpose of starting an induction motor, star/delta switch is an equivalent to auto transformer of ratio

 33.3%
 57.7%
 66.3%
 50%

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Electrical Machines
Which of the following relation is correct?

 Xd = Xq.
None of these
 Xd > Xq.
 Xd < Xq.

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Electrical Machines
A 220 V DC machine has an armature resistance 1Ω. If the full load current is 20 A, the difference of induced voltage and generator is

 0 V.
 20 V.
 60 V.
  40 V.

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Electrical Machines
If the number of rotor slots is equal to number of stator slots, then motor refuses to start. Hence it is known as

  air gap.
  cogging.
  relative speed.
  crawling.

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Electrical Machines
DC generators are usually designed to develop armature voltages not exceeding 650 V because of the limitations imposed by

 commutator
 armature winding
 starters
 field winding

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

 2000 rpm
 1000 rpm
 250 rpm
 500 rpm

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MORE MCQ ON Electrical Machines

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