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Electrical Machines

Electrical Machines
For small value armature current Ia the torque developed by a DC series motor is proportional to

  Ia.
  Ia2.
  √Ia.
  1/Ia.

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Electrical Machines
When the mechanical power is developed by a DC motor maximum

  Back emf is equal to half of applied voltage.
 None of above.
 Back emf is equal.
 back emf is equal to applied voltage.

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Electrical Machines
A short circuit test on a transformer gives

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

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Electrical Machines
For a DC Shunt Motor having armature resistance of 0.5 Ω and 2 A armature current at no-load, when the armature current is changed to 20 A at loaded condition the speed is 1000 r.p.m. What is the speed at no-load?

 4575.4 r.p.m.
 1037.5 r.p.m.
 none of above.
 1130 r.p.m.

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Electrical Machines
In case the conditions for maximum power for DC motor are established, the efficiency of the motor will be

 Any where between 75 % and 90 %.
 Around 100 %.
 Less than 50 %
 Around 90 %

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Electrical Machines
In induction motor especially the cage rotors slots are nearly parallel to shaft axis. This is called

  crawling.
  slip.
  cogging.
  skewing.

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