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Electrical Machines

Electrical Machines
Stepper motor is used in

 food processing
 traction
All of these
 computer printers

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Electrical Machines
A transformer has maximum efficiency at 3/4 load. The ratio of iron loss and full load copper loss is

 4/3.
 9/16.
 3/4.
 16/9.

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Electrical Machines
In V/f speed control of 3-phase induction motor, with increase in frequency, the slip at which maximum torque occurs

 decrease.
 either of these.
 increase.
None of these

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

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

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Electrical Machines
Maximum efficiency will occur, when copper loss is_______to iron loss?

 less than
 equal to
 greater than
 any of the above

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Electrical Machines
In a 1-phase induction motor, if the forward torque slip is S, what is the backward torque slip?

 1-S
 2-S
 S
 1/S

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MORE MCQ ON Electrical Machines

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