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Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. The frequency of rotor current is

 0 Hz
 50 Hz
 1 Hz
 5 Hz

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Electrical Machines
In dc motors, under leading pole tips flux density will--------?

 increase
 either increase or decrease
 decrease
None of these

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Electrical Machines
Fufuraldehyde analysis is done to determine the

 condition of cork gaskets used in transformer.
  condition of paper insulation in transformer.
 condition of lamination on CRGO steel sheet.
 condition of oil in transformer.

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Electrical Machines
The torque speed characteristics of a AC servomotor is approximately

 hyperbola
 any of the above
 linearised
 parabola

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Electrical Machines
The slip of an induction motor normally does not depend on which of the following?

 Rotor speed.
 Shaft torque.
 Synchronous speed.
  Core loss component.

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Electrical Machines
A commutator in DC machines can 1. provide half-wave rectification 2. Provide full-wave rectification 3. convert ac to dc 4. Convert dc to ac 5. provide controlled full-wave rectification From these, the correct answer is

 2, 3 ,5
 2, 3, 4, 5
 1, 2, 3
 2, 3, 4

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