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Electrical Machines

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

 10%
 40%
 5%
 19%

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Electrical Machines
In electric locomotives which of the following motor are used ?

 Synchronous motor.
 DC Shunt motor.
 DC compound motor.
 DC series motor.

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Electrical Machines
A 3 - Φ, 12 pole, 600 V, 50 Hz star connected IM has rotor resistance and stand still resistance of 0.03 Ω and 0.5 Ω respectively. The speed of maximum torque will be

  470 rpm.
 450 rpm.
  240 rpm.
 540 rpm.

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Electrical Machines
Series generators are used in which of the following applications?

 Arc welding.
All of these
 Air crafts.
 Used as boosters in dc distribution or transmission.

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Electrical Machines
The no load current in a transformer lags the applied voltage by

 0°.
 about 115°.
  about 75°.
 90°.

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Electrical Machines
Lamination of core are generally made of

 silicon steel.
 cast iron.
 carbon.
 stainless steel.

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