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Electrical Machines

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

 brass
 copper alloy
 copper
 hard-drawn copper

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Electrical Machines
A DC motor with armature resistance of 0.5 ohms is connected directly to a 230 Volt supply. If the armature is stationary then the current flowing through armature is

 460 A.
 250 A.
 570 A.
 340 A.

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Electrical Machines
If the back emf in DC motor vanishes suddenly the motor will

 run at very high speed.
 start haunting.
 burn.
 run at very low speed.

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Electrical Machines
The power factor of an induction motor operating at no load will have a value around

 0.9 lag
 unity
 0.2 lag
 0.2 lead

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Electrical Machines
Which of the following induction motor has maximum speed?

 4 pole.
 6 pole.
  2 pole.
 8 pole.

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Electrical Machines
In a DC motor under constant terminal voltage what is the relation between torque (Te) and power (P)

 T∝ P
 T∝ P³
 T∝ P²
 T is independent of P

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