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Electrical Machines

Electrical Machines
Flux density under leading pole tips in case of generator will

None of these
 either increase or decrease
 increase
 decrease

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Electrical Machines
In dc machines, the space waveform of the air-gap flux distribution affects

 neither the voltage nor the torque
 torque but not the voltage
 voltage but not the torque
 both the torque and voltage

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Electrical Machines
A 4 pole dc generator is running at 1500 rpm the frequency of current in the armature winding is

 50Hz.
 100Hz.
 150Hz.
 200Hz.

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Electrical Machines
In a synchronous machine, if the field flux axis is ahead of the armature field axis in the direction of rotation, the machine operating is

  asynchronous motor.
  synchronous generator.
  synchronous motor.
  asynchronous generator.

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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
 1, 4
 2, 3
 2, 4

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Electrical Machines
Swinburne's test is applicable to

 DC shunt and level Compound motor.
 DC Shunt motor.
 DC series motor.
 DC compound motor.

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