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Electrical Machines

Electrical Machines
The breakdown torque of a synchronous motor varies as

 V²
 1/V²
 1/V
 applied voltage V

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Electrical Machines
Dynamic braking is very effective for

 separately excited motors.
 differential compound motors.
 series motors.
 shunt motors.

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Electrical Machines
The working principle of transformer depends on

 Faradays law of electromagnetic induction.
 Coulombs law.
 Amperes law.
 Newtons law.

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Electrical Machines
In shaded pole induction motors, the flux moves from ------------- region to ----------------- region respectively?

 unshaded, unshaded
 shaded, shaded
 shaded, unshaded
 unshaded, shaded

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Electrical Machines
In a dc machine 72 number of coils are used. Find the number of commutator segments required?

 72
 36
 37
 74

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Electrical Machines
Transformer action requires a

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

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MORE MCQ ON Electrical Machines

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