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Electrical Machines

Electrical Machines
The heat generated in the transformer is dissipated mainly by

  convection.
All of these
 conduction.
 radiation.

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Electrical Machines
A 2 KVA transformer has iron loss of 150 W and full load copper loss of 250 W. The maximum efficiency of the transformer would occur when the total loss is

 300 W
 250 W
 400W
 500 W

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Electrical Machines
Two transformers operating in parallel will share the load depending on their

 ratings
 leakage reactance
 efficiency
 per unit impedance

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Electrical Machines
In a synchronous machine, if φ is the flux per pole and f is the frequency of the emf induced E then

 E ∝ f/φ
 E ∝ φ/f
 E ∝ φf
 E ∝ 1/(φf)

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Electrical Machines
Lamination of core are generally made of

 silicon steel.
 stainless steel.
 carbon.
 cast iron.

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Electrical Machines
The overall power factor of an on load transformer

 is always unity.
  depends on the power factor of the load.
 is always leading.
 is always lagging.

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