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Electrical Machines

Electrical Machines
A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms.

 0.443.
  0.573.
 0.649.
 0.512.

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Electrical Machines
A short circuit test on a transformer gives

 copper loss at half load.
 copper loss at over load.
  copper loss at any load.
 copper loss at full load.

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Electrical Machines
The size of inter poles is small as compared to main poles. What is the reason?

 In order to get more flux.
 In order to not to get saturated.
 In order to get saturated.
All of these

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Electrical Machines
The DC generator runs at a speed of 1000 rpm and flux per pole is 0.2 Wb, number of poles are 2 the winding is wave wound and having 480 conductors. The critical speed is 1200 rpm. Then the generated emf ( Eg )

  0 Volt.
 2000 Volt.
 1500 Volt.
 1600 Volt.

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Electrical Machines
In a single phase induction motor driving a fan load, the reason for having a high resistance rotor is to achieve

 reduced size.
 high efficiency.
 low starting torque.
  quick acceleration.

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Electrical Machines
The brush-axis of a bipolar dc motor is rotated by 90°. The effect of this rotation on the back emf Eband the torque developed Tdwould be such that

 Eb is zero, but Td is unchanged
 both Eb and Td are zero
 Eb is unchanged, but Td is zero
 both Eb and Td are unchanged

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