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Electrical Machines

Electrical Machines
For the purpose of starting an induction motor, star/delta switch is an equivalent to auto transformer of ratio

 33.3%
 50%
 66.3%
 57.7%

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Electrical Machines
The current drawn by a DC motor at the time of starting is

 Very high.
 Very low.
 Normal.
 Zero.

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

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Electrical Machines
Which of the following motor has more stability

 both motors has same stability
 cylindrical motor
 salient pole motor
None of these

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Electrical Machines
DC series motor is best suited for electric traction as

 It consume less power.
 It runs at very high speed at light load.
 It is cheaper in cost.
  It develops high starting torque.

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Electrical Machines
The core flux in transformer depends mainly on

 supply voltage and load
 supply voltage
 supply voltage and frequency
 supply voltage, frequency and load

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