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Electrical Machines

Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor copper loss?

 40W
 100W
 80W
 60W

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Electrical Machines
What are the starters used for starting of cage motors?

 Auto transformer starter.
  All of these.
 DOL starter.
 Star-delta starter.

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Electrical Machines
A 3 - Φ slip ring motor has

  wound rotor.
  double cage rotor.
  short-circuited rotor.
  any of the above.

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Electrical Machines
A 100 KVA transformer is operating at 60 Hz, 240 V supply. The same transformer is operating at 50 Hz, 200 V supply. The new rating is

 83.33 KVA
 100 KVA
 50 KVA
 123.3 KVA

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Electrical Machines
In dc machines, the space distribution of air-gap flux density wave at no load is

 rectangular
 flat-topped
 co- sinusoidal
 sinusoidal

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Electrical Machines
Breadth factor is defined as the ratio of

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

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