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Electrical Machines

Electrical Machines
The slot edges in a DC machine are made of

 Silicon steel.
 Mild steel.
  Fibre.
 Cast iron.

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Electrical Machines
The armature of a DC motor is laminated to reduce

 eddy current loss.
 hysteresis loss.
 copper loss.
 friction and windage loss.

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Electrical Machines
The speed of a 3-phase induction motor operating in its stable region

 increases with increase in the load torque.
 remains constant.
 decreases with increase in the load torque.
 decreases with decrease in the load torque.

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Electrical Machines
When the rotor speed, in a synchronous machine, becomes more than the synchronous speed during hunting, the damper bars develop

  synchronous motor torque.
  induction generator torque.
  induction motor torque.
  DC motor torque.

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Electrical Machines
The brushes of a DC machine should be placed on the

 armature midway between poles.
 commutator in the inter polar axis.
 armature in the polar axis.
 commutator in the polar axis.

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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?

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

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