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Electrical Machines

Electrical Machines
A voltmeter gives 120 oscillations per minute when connected to the rotor of an induction motor. The frequency is 50Hz. The slip of the motor is

 2%
 4%
 5%
 25%

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Electrical Machines
The back emf produced in a dc motor depends on

  P and Z.
  P.
  Z.
  none of these.

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Electrical Machines
If a transformer has turns ratio K, the primary and secondary current are I1 and I2 respectively and magnetizing current and core loss component of no load current Iμ and Iw respectively, then

 I1 = KI2.
 I1 = KI2 + Iw.
  I1 = KI2 + Iw + Iμ.ok
 I1 = KI2 + Iμ.

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Electrical Machines
Two DC series motors are connected in series and are driving the same mechanical load. If the motors are now connected in parallel the speed will become

 double.
 one fourth.
 4 times.
 half.

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Electrical Machines
Skewing of cage rotors offers the following advantages

  uniform torque.
  all of below.
  less noise.
  locking tendency is reduced.

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Electrical Machines
Normally for the design of transformer the ambient temperature is taken as

 35°C.
 27°C.
 32°C.
  45°C.

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MORE MCQ ON Electrical Machines

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