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Electrical Machines

Electrical Machines
If the air gap of IM is increased, ____________ will increase.

  magnetizing current.
  air gap flux.
  speed.
  power factor.

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Electrical Machines
The torque developed in IM is nearly proportional to

 1 / V2.
  V.
  1 / V.
  V2.

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Electrical Machines
To control the speed of an induction motor, the supply frequency is reduced by 10%. For the same magnetizing current to remain constant, the supply voltage must be

 increased by 20%
 reduced by 10%
 reduced by 20%
 increased by 10%

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Electrical Machines
If the applied voltage of a DC motor is 230 V, then back emf, for maximum power developed is

 460 V.
 200 V.
 230 V.
 115 V.

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

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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 ohms. The value of resistance which must be added to obtain rated torque at 1000 rpm is

 6 ohms.
 1.9 ohms.
 2.2 ohms.
 5.7 ohms.

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