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Electrical Machines

Electrical Machines
When maximum flux density is constant, the eddy current losses are proportional to

 f2
 f
 V2
 V

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Electrical Machines
What is the shunt resistance component equivalent circuit obtained by no load test of an induction motor representative of ?

 Copper loss
 windage and friction loss
 core loss only
 both 1 and 2

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Electrical Machines
An induction motor is, in general analogous to

 two winding transformer with secondary short circuited.
 auto transformer.
None of these
 two winding transformer with secondary open circuited.

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Electrical Machines
The speed of a motor falls from 1100 r.p.m at no-load to 1050 r.p.m at rated load. The speed regulation of motor is

 3.76%.
 2.57 %.
 2.56 %.
 4.76%.

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Electrical Machines
If an induction machine is run at above the synchronous speed it acts as

 an induction generator
None of these
 an induction motor
 a synchronous motor

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

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

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