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Electrical Machines

Electrical Machines
The output voltage of a DC generator is

 E = V – IaRa.
 E = V + Ra.
 E = V + Ia.
  E = V + IaRa.

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Electrical Machines
For a DC machine having P no of pair of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance?

 PZL/4Sp²
 PZL/4S
 PZL/ 4Sa
 PZL/4Sa²

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Electrical Machines
Which of the following is/are the methods to reduce the armature reaction and its effects?

All of these
 compensating winding
 pole chamfering
 pole stacking

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

 either GNA or MNA
 GNA
None of these
 MNA

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Electrical Machines
The commutator segments of DC machines are made up of

 hard-drawn copper
 copper alloy
 brass
 copper

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Electrical Machines
For a standard frequency the machine operates at a particular speed known as

 any of the above.
 normal speed.
 synchronous speed.
 slip speed.

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