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Electrical Machines

Electrical Machines
Which type of motors are preferred in lifts?

 DC compound motors.
None of these
 DC shunt motors.
 DC series motors.

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Electrical Machines
Maximum power developed depends on

 voltage
 reactance
 both 1and 2
 load angle

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Electrical Machines
To have sparkless commutation, the armature reaction effect in a DC machine is neutralized by

 shifting the brush axis from GNA to MNA.
 increasing field excitation.
  compensating winding and commutating poles.
 fixing the brush axis inline with the pole axis.

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Electrical Machines
If the excitation is increased, the power factor is

 leading power factor
 unity power factor
 lagging power factor
None of these

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Electrical Machines
In alternator, the rotary part is

 core.
  magnetic field poles.
 none of these.
 armature.

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Electrical Machines
When maximum flux density is constant, the eddy current losses are proportional to

 f2
 V2
 V
 f

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