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Electrical Machines

Electrical Machines
The induction motor shaft is made of

  stainless steel.
  cast iron.
  mild steel.
  aluminium.

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Electrical Machines
Breadth factor is defined as the ratio of

 emf with concentrated winding to emf with distributed winding.
 both 1 and 2.
None of these
 emf with distributed winding to emf with concentrated winding.

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Electrical Machines
A 4 pole lap wound dc generator has 4 brushes, if one of the brush is damaged, what will be the change in V, I and P ratings

 V, I/2 and P/2
 V/2, I and P/2
 V/2, I/2 and P/4
 V, I and P

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Electrical Machines
Which of the following will vary the maximum torque?

 rotor reactance X
 rotor resistance R
None of these
 both 1 and 2

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Electrical Machines
An IM cannot run at synchronous speed because

  none of above.
  air friction will prevent it.
  rotor torque will not be produced.
  induction motor will become synchronous motor.

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Electrical Machines
The starting resistance of DC motor is generally

 around 500 ohms.
 1000 ohms.
  Low.
 Infinitely large.

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