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Electrical Machines

Electrical Machines
Swinburne test is conducted under which of the following condition?

 full load
 any of the above
 no load
 half load

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Electrical Machines
Which motor cannot be started on no load?

 shunt motors
 series motors
 cumulative compound motors
 both B and C

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Electrical Machines
In a 3-phase induction motor, torque and supply voltage are related as

 T∝ V²
 T ∝ 1/V
 T ∝ V
 T ∝ 1/V²

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Electrical Machines
When a synchronous motor is running at synchronous speed, the damper winding produces

 both 1 and 2.
 no torque.
 eddy current torque.
 damping torqe.

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

 Brush.
  Commutator.
 Armature.
 Yoke.

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Electrical Machines
The armature mmf in a dc machine is 1. stationary with respect to field poles 2. stationary with respect to armature 3. rotating with respect to field poles 4. rotating with respect to armature From these, the correct answer is

 1, 3
 2, 3
 1, 4
 2, 4

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