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Electrical Machines

Electrical Machines
The constant losses in transformer is/are

 both 2 and 3.
 eddy current loss.
 hysteresis loss.
 copper loss.

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Electrical Machines
Stepper motor is used in

 computer printers
All of these
 food processing
 traction

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Electrical Machines
Two identical loss less series motors connected in series across a dc supply voltage, runs at speed of N1 and N2, then ratio of their output power is

 N1 : N2.
 1 : 1.
 N12 : N22.
 none.

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Electrical Machines
The core flux in transformer depends mainly on

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

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Electrical Machines
A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms.

 0.443.
  0.573.
 0.512.
 0.649.

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Electrical Machines
A crusher is equipped with

 Slip ring induction motor.
 Reluctance motor.
 DC shunt motor.
 Synchronous motor.

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MORE MCQ ON Electrical Machines

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