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Electrical Machines

Electrical Machines
The commutator segments of DC machines are made up of

 copper alloy
 hard-drawn copper
 brass
 copper

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Electrical Machines
A 8-pole, DC generator has a simplex wave-wound armature containing 32 coils of 6 turns each. Its flux per pole is 0.06 Wb. The machine is running at 250 rpm. The induced armature voltage is

 384 V
 192 V
 96 V
 768 V

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Electrical Machines
To increase starting torque of a 3-phase slip ring induction motor, preferred method is to increase

None of these
 rotor resistance
 supply frequency
 supply voltage

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Electrical Machines
An 8 pole DC generator has 500 armature conductors and useful flux per pole of 0.065 Wb. What will be the emf generated if it is lap connected and runs at 1000 rpm. What must be the speed at which it is driven to produce the same emf if it is wave wound?

 2166.67V, 230 rpm.
 541.67V, 200 rpm.
 541.67V, 250 rpm.
 2166.67V, 270 rpm.

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Electrical Machines
The sequence of induction motor is RYB, then the direction of induction motor can be changed by which of the following sequence?

All of these
 BRY
 BYR
 RBY

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Electrical Machines
Under operating conditions the rotor conductor should be _________________ in induction motor.

  semi closed or semi opened.
  always opened.
  none.
  always closed.

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