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Electrical Machines

Electrical Machines
The maximum power developed in cylindrical synchronous machine is occurs at a load angle of

 less than 90o.
 90o.
 Greater than 90o.
 0o.

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Electrical Machines
Which of the following pairs is/are correct?

All of these
 semi closed slot-----leakage flux is moderate
 open slot----- leakage flux is less
 closed slot----- leakage flux is high

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Electrical Machines
A large series motor is never started without some mechanical on it because otherwise it will

  Develop excessive speed and damage itself.
 Draw too much current.
 Produce sparking at brushes.
 Open fuse or circuit breaker.

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Electrical Machines
The polarity of a DC generator can be reversed by

 reversing field electric current as well as direction of rotation.
 reversing the field current.
 any of above.
 increasing field current.

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Electrical Machines
Cross magnetization effects which of the following?

 commutation
 both 2 and 3
 reduction in main field flux
 reduces the terminal voltage

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Electrical Machines
The power input to a 3 - φ induction motor is 60 kW and stator loss is 1 kW the rotor cu loss per phase is

  slip X 50 / 3.
  slip X 59 / 3.
 1.
  slip X 69 / 3.

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