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Electrical Machines

Electrical Machines
In DC generator on no-load, the air gap flux distribution in space is

 triangular.
  flat topped.
  pulsating.
  sinusoidal.

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

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Electrical Machines
A separately-excited DC generator, running at rated speed, has 6 volts across its armature terminals with no field current. When field winding is excited with one ampere, the voltage builds up to 250 V at no load. In case field current is reduced to zero, with the speed remaining unaltered, the armature terminal voltage would be

 less than 6 V
 zero
 6 V
 more than 6 V

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Electrical Machines
The direction of generated emf in the armature coil of a DC machine is 1. the same as that of the current in a generator 2. the same as that of the current in a motor 3. opposite to that of the current in a generator 4. opposite to that of the current in a motor From these, the correct answer is

 1, 3
 2, 3
 1, 4
 2, 4

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Electrical Machines
Secondary winding of an auto transformer is also called

 compensating winding.
  common winding.
 damping winding.
 tertiary winding.

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Electrical Machines
Considering a galvanometer is connected to the rotor of a 3 - Φ, 4 pole, 50 Hz IM and is making 130 oscillations in a minute, then calculate the rotor speed?

 1440.
 1450.
  1435.
 1500.

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