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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

 57.7%
 66.3%
 50%
 33.3%

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Electrical Machines
A short-shunt cumulatively-compounded dc generator builds up a voltage of 220 V at no load at rated speed. If it is operated as a differentially compounded generator, other things remaining the same, it would build up

 somewhat less than 220 V
 more than 220 V
 220 V
 6 V

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Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is

 400 A.
 440 A.
 44 A.
 40 A.

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Electrical Machines
The armature of a DC motor is laminated to reduce

 friction and windage loss.
 hysteresis loss.
 copper loss.
 eddy current loss.

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Electrical Machines
In double cage induction motor, the outer cage offers

  low resistance and low reactance.
  high resistance and high reactance.
  high resistance and low reactance.
  low resistance and high reactance.

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Electrical Machines
For a 3 - Φ, 4 pole, 50 Hz IM rotating at full load speed of 1440 rpm, calculate speed of rotor field with respect to rotor structure and stator structure respectively?

  60, 1500.
 50, 1500.
 60, 1440.
 1440, 1500.

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