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Electrical Machines

Electrical Machines
Compensating winding is placed in the

All of these
 armature core
 pole shoe
 main field

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Electrical Machines
If the field circuit of a DC shunt motor is opened

 The speed of motor will be reduced.
 DC Shunt Motor
  The motor will attain dangerously high speed.
 The armature current will reduce.

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Electrical Machines
In a single phase transformer the magnitude of leakage reactance is twice that of resistance of both primary and secondary. With secondary short circuited, the input power factor is

 2/√5
 1/3
 1/√5
 1/√2

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Electrical Machines
Width of a carbon brush should be equal to

 the width of the 1 to 2 commutator segment.
 less than the width of commutator segment.
 the width of the 2 to 3 commutator segment.
 the width more than 3 commutator segment.

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Electrical Machines
For P pole machine relation between electrical degrees and mechanical degrees is

 θelec = θmech
 θelec = 4/P*θmech
 θelec = P/2*θmech
 θelec = 2/P*θmech

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Electrical Machines
In a 1-phase induction motor, if the forward torque slip is S, what is the backward torque slip?

 1/S
 2-S
 1-S
 S

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MORE MCQ ON Electrical Machines

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