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Electrical Machines

Electrical Machines
A DC generator without commutator is a

 induction motor
 DC generator
 DC motor
 AC generator

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Electrical Machines
A single phase transformer has specifications as 250 KVA, 11000 V/415 V, 50 Hz. What are the values of primary and secondary currents?

 primary = 22.7 A, secondary = 602.4 A
 primary = 11.4 A, secondary = 301 A
 primary = 301 A, secondary = 22.7 A
 primary = 602 A, secondary = 22.7 A

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Electrical Machines
The slip of an induction motor normally does not depend on

  core loss component.
  shaft torque.
  synchronous speed.
  rotor speed.

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Electrical Machines
Swinburne's test is applicable to

 DC Shunt motor.
 DC series motor.
 DC compound motor.
 DC shunt and level Compound motor.

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Electrical Machines
Induction motor operation depends on

None of these
 rotating magnetic field.
 stationary magnetic field.
 either of these.

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

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

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