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Electrical Machines

Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

None of these
 GNA
 either GNA or MNA
 MNA

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Electrical Machines
In a DC Shunt Motor if the load current increases keeping the terminal voltage constant, then flux will

 remain constant.
 increase.
 decrease.
 any of the above.

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Electrical Machines
A 4 pole wave wound dc motor having flux per pole of 9.56 X 10-3 Wb contains 460 armature conductors with armature resistance of 0.6 ohm. Calculate the starting current flowing through the armature if the supply voltage is 240 volt.

  400 Amp.
 320 Amp.
  0.5 Amp.
 800 Amp.

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Electrical Machines
The fall in speed of the DC generator due to increase in load can be corrected by

  increasing the input to the prime mover.
  increasing the excitation.
  reducing the load voltage.
 cooling the armature.

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Electrical Machines
The working principle of transformer depends on

 Amperes law.
 Coulombs law.
 Newtons law.
 Faradays law of electromagnetic induction.

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Electrical Machines
When a transformer is loaded, the secondary terminal voltage drops. That means power factor is

 unity.
 leading.
 zero.
  lagging.

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