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Electrical Machines

Electrical Machines
Induction motors have the advantage of

  all of below.
  less maintenance.
  simple in construction.
  less cost.

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Electrical Machines
Which of the following induction motor has the highest starting torque?

 Slip ring induction motor.
None of these
 Squirrel cage induction motor.
 Same in both induction motors.

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Electrical Machines
If the armature electric current is increased to double its previous value, and the time of commutation is halved, how will the reactance voltage vary?

  It will be halved.
 It will remain the same.
  It will be doubled.
  It will becomes four times.

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Electrical Machines
In DC machine torque depends on which of the following?

 both A and B
 flux (φ)
 speed
 armature current (I)

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Electrical Machines
In travelling cranes for swing action which motor is preferred?

  Capacitor type induction motors.
  Reluctance motor.
  AC slip ring IM.
  DC series motor.

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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

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

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