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ELECTRICAL MACHINES

Electrical Machines
Which of the following motors has negative speed regulation?

 Both B and C.
 Differential compound motors.
 Series motors.
 Shunt motors.

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Electrical Machines
Field weakening control method is used for the _________ ?

 above rated speed
 both A and B
None of these
 below rated speed

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Electrical Machines
Armature resistance control method is used for the _______ ?

 above rated speed
 both 1 and 2
 below rated speed
None of these

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Electrical Machines
Armature reaction effect is more in which of the following methods?

 armature resistance control
 same in both methods
None of these
 field weakening method

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Electrical Machines
Field weakening method is also called as-----------?

 constant voltage control
 constant current control
 constant torque control
 constant power control

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