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Electrical Machines

Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

 MNA
 either GNA or MNA
None of these
 GNA

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Electrical Machines
During hunting of a synchronous motor

  damper bar develops torque.
  negative phase sequence currents are generated.
  harmonic are developed in the armature circuit.
  field excitation increases.

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Electrical Machines
Transformers operating in parallel will share the load depending upon their

 leakage reactance.
 rating.
 efficiency.
 percentage impedance.

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Electrical Machines
Which of the following statements are correct ?

 Both 1 and 2.
None of these
 A small value of leakage reactance will increase the maximum power output of motor.
 The leakage reactance of the induction motor should be small.

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Electrical Machines
The direction of rotation of conductor of a DC motor can be determined by

 Lenz's law.
 Fleming's right hand rule.
 Fleming's left hand rule.
 Ampere law.

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

 1 Hz
 5 Hz
 0 Hz
 50 Hz

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