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Electrical Machines

Electrical Machines
Transformer cooling and insulating oil must be of

 low BDV.
  low viscosity.
 low resistivity.
 high viscosity.

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Electrical Machines
A 230 V dc series generator is driven at its rated speed. The no-load voltage across its armature terminals would be

 somewhat more than 230 V
 6 V
 230 V
 somewhat less than 230 V

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Electrical Machines
If the mechanical angle α between the stator and rotor poles increases, then the stator current

 None of above.
 Decreases.
 Remains unchanged.
  Increases.

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Electrical Machines
The slot edges in a DC machine are made of

 Silicon steel.
 Cast iron.
  Fibre.
 Mild steel.

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Electrical Machines
Two generators G1 and G2 are to be operated in parallel to deliver a total current of 60 A. Generator one has a terminal voltage of 280 V on no load and 240 V when supplying 40 A current. Similarly the second generator has a voltage of 300 V when on no load and 240 V when supplying of 50 A of current. The output voltage of each generator will be

  256.4 V.
 271.7 V.
 238.2 V.
 240 V.

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Electrical Machines
Which of the DC Motor use flywheel?

 Series motor.
 Cumulatively compound motor.
 Differently compared motor.
 Shunt motor.

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