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Electrical Machines

Electrical Machines
What is the increase in the torque expressed as percentage of initial torque, if current drawn by the dc series motor is increased from 10A to 11A?

 11%
 41%
 21%
 10%

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Electrical Machines
Which single phase motor is used for a refrigerator?

  Universal.
  Repulsion.
  Split phase.
  Capacitor run.

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Electrical Machines
In a 3-phase induction motor, torque and supply voltage are related as

 T ∝ V
 T∝ V²
 T ∝ 1/V
 T ∝ 1/V²

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Electrical Machines
In V/f speed control of 3-phase induction motor, with increase in frequency, the slip at which maximum torque occurs

 decrease.
 either of these.
 increase.
None of these

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Electrical Machines
3rd harmonics are eliminated in induction motor by using

  delta connection.
  V connection.
  star connection.
  zig - zag connection.

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Electrical Machines
In above question, the output power delivered by generator G1 and G2 will be

 9.3 kW, 9.3 kW.
 9.6 kW, 12 kW.
 5.7 kW, 8.7 kW.
  6.3 kW, 9.3 kW.

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