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Electrical Machines

Electrical Machines
Slip rings of an induction motors are made of

  stainless steel.
  carbon.
  aluminium.
  phosphor bronze.

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Electrical Machines
When operating, two or more transformers in parallel, % impedance of these transformers should be

  same.
 inversely proportional to MVA rating of transformers.
 such that actual impedance of all transformers would be same.
 proportionate to MVA rating of transformers.

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Electrical Machines
Commutator pitches of duplex and simplex lap windings are respectively

 2 and 2
 4 and 2
 4 ang 1
 2 and 1

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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 ?

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

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

 57.7%
 66.3%
 33.3%
 50%

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Electrical Machines
If a DC Series motor is connected across an AC supply it will

 not run.
 run at normal speed.
 burn.
 run at lower speed.

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