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Electrical Machines

Electrical Machines
The speed of stator rotating magnetic field (RMF) with respect to rotor is

 S.Ns
 Zero
 Ns
 Nr

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Electrical Machines
Swinburne's test is applicable to

 DC compound motor.
 DC Shunt motor.
 DC series motor.
 DC shunt and level Compound motor.

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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
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

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

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Electrical Machines
Armature resistance control method is also called as-----------?

 constant voltage control
 constant current control
 constant torque control
 constant power control

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Electrical Machines
Ratio of starting torque to full load torque is minimum in

  Shunt motor.
  Cumulative compound motor.
  Differential compound motor.
  Series motor.

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MORE MCQ ON Electrical Machines

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