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Electrical Machines

Electrical Machines
Hysteresis loss is proportional to

 f2.
 f1.5.
 f3.
  f.

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Electrical Machines
In DC generator, armature reaction refers to what?

None of these
 Effect of armature flux on the load.
  Effect of armature flux on the main field flux.
 Effect of field flux on the armature flux.

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Electrical Machines
A 2 pole synchronous machine is operating at 3000 rpm. Find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm) ?

 ωe = ωm
 ωe = 1/2*ωm
 ωe = 2*ωm
 ωe = 4*ωm

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Electrical Machines
Commutators in DC machines have a role of which converts

 AC to DC.
 high voltage DC to low voltage DC.
 Both AC to DC and DC to AC.
 none of these.

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Electrical Machines
Demagnetization effects which of the following?

 reduction in main field flux
 reduces the terminal voltage
 commutation
 both B and C

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Electrical Machines
Unbalance 3 - Φ stator currents cause

  heating of rotor.
  vibrations.
  double frequency currents in the rotor.
All of these

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