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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
 1 Hz
 50 Hz
 5 Hz

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Electrical Machines
The ___________________ generator has the poorest voltage regulation.

  over compounded.
  differential compounded.
  shunt.
  under-compounded.

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Electrical Machines
Flux density under trailing pole tips in case of generator will

None of these
 decrease
 increase
 either increase or decrease

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Electrical Machines
In star-delta starting of squirrel cage induction motor compared to DOL starting the starting current and torque are

 1/3, 1/3
 1/√3, 1/3
 1/3, 1/√3
 1/√3, 1/√3

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Electrical Machines
The working principle of transformer depends on

 Faradays law of electromagnetic induction.
 Amperes law.
 Coulombs law.
 Newtons law.

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Electrical Machines
In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as

  1.5 to 2.
 3 to 5.
 1.0.
 2 to 3.

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MORE MCQ ON Electrical Machines

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