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Electrical Machines

Electrical Machines
As compared to an induction motor, the air gap in a DC motor is

 between 50% and 90%.
 less than 50%.
 same.
 more.

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Electrical Machines
Which of the following motors are suitable for computer printer drive ?

 Hysteresis motor.
 Reluctance motor.
 Shaded pole motor.
  Stepper 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.
 60 V.
 40 V.
 30 V.

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Electrical Machines
A three phase 400 V, 6 pole, 50 Hz, squirrel cage induction motor is running at a slip of 5%. The speed of stator magnetic field with respect to rotor magnetic field and speed of rotor w.r.t stator magnetic field are

 1000 rpm, 950 rpm.
 zero , - 50 rpm.
 1000 rpm, - 50 rpm.
 zero, 950 rpm.

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Electrical Machines
In an auto transformer, for what value of turn ratio, power transferred by inductively and conductively are same?

 0.5
 1
 any of the above
 0

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Electrical Machines
When a short circuit test on a transformer is performed at 25 V, 50 Hz, the drawn current is I1. If the test is performed by 25 V and 25 Hz and power drawn current is I2, then

 I1 = I2
None of these
 I1 < I2
 I1 > I2

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