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Electrical Machines

Electrical Machines
To eliminate 5th harmonic in the induced voltage phase breadth should be

 18°
 36°
 72°
 30°

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Electrical Machines
In DC generator, full form of MNA is what?

  Magnetic neutral axis.
 Magnetically no-load armature co-ordinate.
 Magnetic no-load axis.
 Magnetic neutral armature co-ordinate.

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Electrical Machines
A self-excited shunt generator fails to build up, because 1. the field circuit is open 2. The armature circuit is open 3. the residual magnetism is absent 4. The direction of rotation is wrong From these, the correct answer is

 1, 2 and 3
 1, 2, 3 and 4
 1, 3
 3 only

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Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor copper loss?

 40W
 60W
 80W
 100W

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Electrical Machines
Which of the following generators are used in arc welding?

 cumulative compound generators
 shunt generators
 differential compound generators
 series generators

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Electrical Machines
Diverters are used only in

 series motors
 either of these
 shunt motors
None of these

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