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Electrical Machines

Electrical Machines
A 3-phase, 2 pole, 12 slot synchronous machine is operating at synchronous speed. Find the slot angle?

 60°
 30°
 20°
 18°

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Electrical Machines
A 3-phase slip ring induction motor is wound for 4 poles on stator and 6 poles on the rotor. When 3-phase balanced voltage source at 50 Hz is applied, it will run at

 zero speed
 750rpm
 1000 rpm
 1500 rpm

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Electrical Machines
Star - delta method of starting of motor is not possible in case of

  low horse power motor.
  high torque motor.
  single phase induction motor.
  high speed motor.

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Electrical Machines
Torque developed in the rotor is

 directly proportional to slip
 either of these
 inversely proportional to slip
 not dependent on the slip

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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 ?

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

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Electrical Machines
The demagnetising component of armature reaction in a DC generator

  reduces inter poles flux density.
  increases armature speed.
  reduces generator emf.
  results in sparking trouble.

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