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Electrical Machines

Electrical Machines
Induction motors have the advantage of

  less cost.
  simple in construction.
  less maintenance.
  all of below.

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Electrical Machines
Find the developed torque DC Series Motor having armature resistance of 0.2 Ω and taking armature current of 60 A is connected to 250 V supply. Considered brush drop of 1 V each.

 133.22 N-m
 266.20 N-m.
 234.76 N-m.
 cant be determined.

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Electrical Machines
The speed of a 3-phase induction motor operating in its stable region

 decreases with decrease in the load torque.
 remains constant.
 decreases with increase in the load torque.
 increases with increase in the load torque.

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

 15 HP.
  10 HP.
 14 HP.
  13 HP.

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Electrical Machines
A 3 - Φ, 6 pole, 50 Hz IM is running at a full load speed of 980 rpm. If it delivers an air gap power of 98000 Watt, calculate the rotor ohmic loss?

  1960 Watt.
  980 Watt.
 1800 Watt.
 1920 Watt.

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Electrical Machines
The maximum possible speed at which an alternator can be driven to generate 50 Hz and 4000 V is

  3600 rpm.
  3000 rpm.
  1500 rpm.
  4000 rpm.

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