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Electrical Machines

Electrical Machines
Universal motors are used in

 food processing
 cranes
All of these
 traction

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Electrical Machines
A 3 - Φ, 400 / 200 V, Y - Y connected wound rotor induction motor has 0.06 Ω rotor resistance and 0.3 Ω standstill reactance per phase. To make the starting torque equal to maximum torque of the motor the additional resistance required

 0.78 Ω.
 0.45 Ω.
  0.24 Ω.
 0.66 Ω.

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Electrical Machines
Transformer action requires a

 increasing magnetic flux.
 alternating magnetic lux.
 constant magnetic flux.
 alternating electric flux.

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Electrical Machines
In a 12 pole triplex lap wound DC armature, each conductor can carry current of 100 A. The rated current of this armature is

 2400 A.
 1200 A.
 600 A.
  3600 A.

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Electrical Machines
A triangular mmf wave is produced in the air gap of an electric machine. Such wave is produced by

 rotor of a dc machine.
 stator of a dc machine.
 stator of a induction machine.
 rotor of an synchronous machine.

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Electrical Machines
Which of the following motors has low ratings only?

 Shaded pole
 Capacitor start
 Capacitor run
 Resistance split phase

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MORE MCQ ON Electrical Machines

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