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Electrical Machines

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

  voltage.
  load.
  speed and voltage.
 speed.

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Electrical Machines
A 240 V dc series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 Ω. The value of resistance which must be added to obtain rated torque at 1000 rpm is

 5.7 Ω
 1.9 Ω
 2.2 Ω
 6 Ω

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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

 200Hz.
 150Hz.
 50Hz.
 100Hz.

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Electrical Machines
Which type of motors uses slip rings?

 Synchronous motors
 DC Shunt Motor
 Both Synchronous and Induction motor
 Induction motors

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Electrical Machines
During no load test, an induction motor draws power

  for core loss and windage and friction loss.
  only for the small copper loss.
  for copper loss and windage friction loss.
  for core loss and copper loss.

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Electrical Machines
We can apply source transformation to voltage source when a resistance is connected to it in

  10 HP.
 14 HP.
 15 HP.
  13 HP.

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