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Electrical Machines

Electrical Machines
A 3-phase, 50Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor output power?

 1820W
 1920W
 2000W
 1450W

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Electrical Machines
Which of following components of a DC generator plays vital role for providing direct electric current of a DC generator?

 Equalizer rings.
 Commutator.
 Dummy coils.
 Eye bolt.

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Electrical Machines
A 220 ,V 15 , kW 100 rpm shunt motor with armature resistance of 0.25 , W has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is

 36.36% decrease
 36.36% increase
 18.18% increase
 36.36% increase

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Electrical Machines
Copper brushes in DC machine are used

 where low voltage and high currents are involved.
None of these
 in both of above cases.
 where high voltage and low current.

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Electrical Machines
What are slot wedges in a DC machine made of?

 Silicon steel.
 Cast iron.
 Fibre.
 Mild steel.

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Electrical Machines
What is the effect of armature reaction ?

  Both option B and C.
 None of the options.
 Armature flux distorts the main field flux.
 Armature flux weakens the main field flux.

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