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Electrical Machines

Electrical Machines
In an induction motor, air gap power is 10 Kw and mechanically developed power is 8 Kw. What are the rotor ohmic losses?

 2KW
 0.5Kw
 3KW
 1.5KW

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Electrical Machines
In travelling cranes for swing action which motor is preferred?

  Reluctance motor.
  AC slip ring IM.
  DC series motor.
  Capacitor type induction motors.

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Electrical Machines
It is an advisable to use auto transformer if the transformation ratio is

 0.5.
 near to 1.
 Greater than 1.
 0.25.

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Electrical Machines
Transformer core is laminated to reduce

 hysteresis loss.
 both 1 and 2.
 eddy current loss.
 copper loss.

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Electrical Machines
A series generator is connected in series to a feeder having 0.5Ω resistance to boost the voltage. The induced voltage is given by Eg = 0.6Ia, Ra = 0.2Ω and Rs = 0.3Ω. Find the voltage boosted by the generator, when delivering 400 Amp?

 60 V.
 40 V.
 90 V.
 30 V.

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Electrical Machines
Which type of motors uses slip rings?

 Both Synchronous and Induction motor
 DC Shunt Motor
 Synchronous motors
 Induction motors

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