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Electrical Machines

Electrical Machines
In an induction motor, what is the ratio of rotor input to rotor copper loss?

 1/S
 S
 1/(1-S)
 1-S

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Electrical Machines
A 3-phase 6 pole 50 Hz induction motor is running at 5% slip.What is the speed of the motor?

 900 rpm
 850 rpm
 950 rpm
 1000 rpm

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Electrical Machines
In a DC generator if field winding attains the critical resistance

 the voltage generated will be zero.
 field winding will burn.
 machine will generate maximum power.
 machine will generate maximum voltage.

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Electrical Machines
High starting torque and low starting current is the advantage of

  slip ring induction motor.
  squirrel cage induction motor.
  stepper motor.
  hysteresis motor.

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Electrical Machines
What is the mechanical power developed by a DC series motor is maximum?

 Back emf is equal to zero.
 Back emf is equal to half the applied voltage.
 None of above.
 Back emf is equal to applied voltage.

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Electrical Machines
If the speed of a dc motor increases with load torque, then it is a

 differentially compounded motor
 permanent magnet motor
 comulatively compounded motor
 series motor

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