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Electrical Machines

Electrical Machines
If we increase the rotor reactance value, the maximum torque will

 not changed
 decrease
None of these
 increase

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Electrical Machines
Which of the following motor is expensive for same Kw output rates?

 DC Shunt Motor
 Induction motor.
 AC single phase motor.
 Synchronous motor.

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Electrical Machines
Torque developed in the rotor is

 not dependent on the slip
 either of these
 inversely proportional to slip
 directly proportional to slip

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Electrical Machines
Which of the following pairs is/are correct?

All of these
 closed slot----- leakage flux is high
 semi closed slot-----leakage flux is moderate
 open slot----- leakage flux is less

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Electrical Machines
Equalizer rings are used in which of the followings?

None of these
 wave winding
 lap winding
 both 1 and 2

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Electrical Machines
Direction of rotation of DC motor is reversed by

 Interchanging armature and field connection.
 Reversing supply connection.
 Adding resistance to field circuit.
 Reversing armature connection or field connection.

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