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Electrical Machines

Electrical Machines
If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is

 200 V
 460 V
 115 V
 230 V

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Electrical Machines
A 100 KVA transformer is operating at 60 Hz, 240 V supply. The same transformer is operating at 50 Hz, 200 V supply. The new rating is

 100 KVA
 83.33 KVA
 123.3 KVA
 50 KVA

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Electrical Machines
Which of the following motor is expensive for same Kw output rates?

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

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Electrical Machines
Universal motors are used in

 traction
 food processing
 cranes
All of these

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Electrical Machines
Slip test is performed to determine

 positive sequence reactance and negative sequence reactance
 slip
All of these
 direct axis reactance and quadrature axis reactance

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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

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

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