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Electrical Machines

Electrical Machines
The rotor power output of 3-phase induction motor is 15 KW. The rotor copper losses at a slip of 4% will be

 650 W
 700 W
 600 W
 625 W

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Electrical Machines
A delta/star transformer is connected in parallel to a star/delta transformer. The turn ratio former is x times latter, the x is

 1/√3
 1/3
 √3
 3

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Electrical Machines
For satisfactory performance of 3-phase 480V, 60 Hz induction motor, the supply voltage at 50 Hz should be equal to

 480 V.
 420 V.
 400 V.
 350 V.

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Electrical Machines
The use of double squirrel cage winding on the rotor provides

  a large starting torque.
 low noise.
 higher efficiency.
 reduced starting torque.

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Electrical Machines
A DC compound motor has

 both shunt and series field winding.
 only series field winding.
 tertiary winding.
 only shunt field winding.

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Electrical Machines
DC shunt motors are suitable for

 Lathes.
 Blowers and fans.
  All of this.
 Centrifugal pumps

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MORE MCQ ON Electrical Machines

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