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Electrical Machines

Electrical Machines
A 3 - Φ, 4 pole, 50 Hz induction motor 4 % slip, calculate frequency of the rotor emf?

 50 Hz.
 10 Hz.
  2 Hz.
  3 Hz.

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Electrical Machines
Which of the following is/are not a self starting motor?

None of these
 1-phase induction motor
 both 1 and 2
 3-phase induction motor

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Electrical Machines
The size of inter poles is small as compared to main poles. What is the reason?

 In order to not to get saturated.
All of these
 In order to get more flux.
 In order to get saturated.

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Electrical Machines
Which of the following machine is invariably provided with forced ventilation?

 Fractional horse power high speed motor.
 50 MW generator in a power plant.
  Hermetically sealed motor of refrigerator.
 Fractional horse power slow speed 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?

 90 V.
 40 V.
 30 V.
 60 V.

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Electrical Machines
In a transformer zero voltage regulation is achieved at a load power factor which is

 unity
 zero
 lagging
 leading

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