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Electrical Machines

Electrical Machines
In a dc machine 6 pole wave winding is used. The number of parallel paths are?

 2
 1
 6
 4

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Electrical Machines
The supply voltage to an induction motor is reduced by 10%. By what percentage, approximately, will the maximum torque decrease?

 10%
 19%
 40%
 5%

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Electrical Machines
Which of the following will vary the maximum torque?

 rotor resistance R
 both 1 and 2
None of these
 rotor reactance X

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Electrical Machines
A dc series motor driving and electric train faces a constant power load. It is running at rated speed and rated voltage. If the speed has to be brought down to 0.25 p.u. the supply voltage has to be approximately brought down to

  0.75 p.u
  0.5 p.u
  0.25 p.u
  0.125 p.u

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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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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.
 225 Ω.
 145 Ω.
 150 Ω.

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