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Electrical Machines

Electrical Machines
At slip s = 1 torque developed in machine is

  maximum torque.
  none.
  starting torque.
  electromagnetic torque.

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Electrical Machines
A synchronous machine has P number of poles, find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm)?

 ωe = ωm
 ωe = P*ωm
 ωe = P/2*ωm
 ωe = 2/P*ωm

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Electrical Machines
In DC generator, which component plays the vital role to produce the direct current?

 Yoke.
 Armature.
  Commutator.
 Brush.

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Electrical Machines
In electric locomotive which of the following motor are used ?

  Synchronous motor.
  DC series motor.
  Separately compound motor.
  Shunt motor.

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Electrical Machines
A 4 pole wave wound dc motor having flux per pole of 9.56 X 10-3 Wb contains 460 armature conductors with armature resistance of 0.6 ohm. Calculate the starting current flowing through the armature if the supply voltage is 240 volt.

 800 Amp.
 320 Amp.
  0.5 Amp.
  400 Amp.

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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

 750rpm
 zero speed
 1500 rpm
 1000 rpm

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