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Electrical Machines

Electrical Machines
For pure resistive load what is the armature reaction?

All of these
 demagnetization
 magnetization
 cross magnetization

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Electrical Machines
Slip rings of an induction motors are made of

  aluminium.
  phosphor bronze.
  carbon.
  stainless steel.

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

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Electrical Machines
Maximum power developed in a cylindrical synchronous machine depends on

 synchronous reactance
 load angle
 excitation
 both 1and 2

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Electrical Machines
Unbalanced supply voltage given to a 3 - φ, delta connected induction motor will cause

  less heating of the rotor.
  negative sequence current.
  less heating of the rotor.
  all of these.

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Electrical Machines
A small air gap in poly phase induction motor helps to

 reduce chance of cogging.
 increase starting torque.
  reduce magnetizing current.
 reduce chance of crawling.

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MORE MCQ ON Electrical Machines

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