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Electrical Machines

Electrical Machines
which of the following losses are negligible in blocked rotor test?

 iron loss
 both A and B
 mechanical loss
 copper loss

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

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

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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.
 30 V.
 90 V.

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Electrical Machines
Which of the following statements are correct ?

 A small value of leakage reactance will increase the maximum power output of motor.
None of these
 Both 1 and 2.
 The leakage reactance of the induction motor should be small.

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Electrical Machines
Hopkinson test is conducted under which of the following condition?

 any of the above
 half load
 no load
 full load

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Electrical Machines
Ward Leonard control is provides speed control

  Below rated speed.
  In both direction.
  In one direction only.
  Above rated speed.

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