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Electrical Machines

Electrical Machines
Iron losses in a DC machine are independent of variation in

  load.
  speed and voltage.
 speed.
  voltage.

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Electrical Machines
Under commutation results in

  sparking at the leading edge of the brush.
  no sparking.
  sparking the trailing edge of the brush.
  sparking at the middle of the brush.

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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 )

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

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Electrical Machines
A short-shunt cumulatively-compounded dc generator builds up a voltage of 220 V at no load at rated speed. If it is operated as a differentially compounded generator, other things remaining the same, it would build up

 220 V
 somewhat less than 220 V
 6 V
 more than 220 V

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Electrical Machines
Rotor resistance speed control is used in

 synchronous motor.
 squirrel cage induction motor.
 dc shunt motor.
 slip ring induction motor.

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Electrical Machines
In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch

 10
 100
 50
 1

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