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Electrical Machines

Electrical Machines
Stepper motor is used in

 computer printers
All of these
 food processing
 traction

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Electrical Machines
In a single phase transformer the magnitude of leakage reactance is twice that of resistance of both primary and secondary. With secondary short circuited, the input power factor is

 1/√2
 1/3
 1/√5
 2/√5

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Electrical Machines
The magnetic field which initially induces emf in the armature in a self excited DC generator is because of

  residual magnetism.
None of these
 armature reaction.
  permanent magnets.

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Electrical Machines
The maximum possible speed at which an alternator can be driven to generate 50 Hz and 4000 V is

  3000 rpm.
  1500 rpm.
  3600 rpm.
  4000 rpm.

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Electrical Machines
A 4 pole wave wound dc motor having flux per pole of 9.56 X 10-3 Wb contains 460 armature conductors with armature resistance of 0.6 ohm. Calculate the starting current flowing through the armature if the supply voltage is 240 volt.

  400 Amp.
 800 Amp.
  0.5 Amp.
 320 Amp.

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Electrical Machines
Which of the following motor is more expensive for same KW output rating ?

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

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