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Electrical Machines

Electrical Machines
A 3-phase, 50Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor output power?

 1820W
 1920W
 1450W
 2000W

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Electrical Machines
Armature flux is.............with respect to main field flux or main field poles?

 rotates same direction
None of these
 stationary
 rotates opposite direction

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Electrical Machines
Which of the following voltage regulator is preferred for providing large values of load current?

  Zener diode shunt regulator.
  Transistor shunt regulator.
  Transistor series regulator.
None of these

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Electrical Machines
The squirrel cage induction motors are provided with blades in order to

  facilitate cooling of rotor.
  balance the rotor dynamically.
  eliminate noise.
  none of these.

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

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

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Electrical Machines
Consider the following statements : For a level compounded dc generator to run at constant voltage, the series field mmf must effectively compensate 1. armature reaction mmf 2.armature resistance drop 3. brush contact voltage drop Which of these statements is/are correct ?

 2 alone
 1 and 3
 1, 2 and 3
 1 and 2

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