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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?

 100W
 60W
 80W
 40W

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Electrical Machines
Hunting in a synchronous cannot be due to

  variable supply voltage.
  windage friction.
  variable load.
  variable frequency.

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Electrical Machines
For 250 volt DC Shunt Motor the armature and field resistance are 0.5 ohm and 250 ohm respectively. What will be the back e.m.f. produced when it takes a load current of 21A.

 150 V.
 220 V.
 280 V.
 240 V.

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Electrical Machines
A shunt generator has a critical field resistance of 300 Ω at a speed of 800 rpm if the speed is raised to 1000 rpm the critical field resistance is

  375 Ω.
 150 Ω.
 225 Ω.
 145 Ω.

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Electrical Machines
CRGO steel is used in the core of transformer to reduce

  hysteresis loss.
 both eddy current and hysteresis loss.
 eddy current loss.
 ohmic loss.

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Electrical Machines
In a transformer which of the following losses are zero?

 Copper loss
 Iron loss
All of these
 Rotational loss

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