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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?

 21%
 10%
 41%
 11%

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Electrical Machines
In a single phase induction motor driving a fan load, the reason for having a high resistance rotor is to achieve

  quick acceleration.
 reduced size.
 low starting torque.
 high efficiency.

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Electrical Machines
Cross magnetization effects which of the following?

 both 2 and 3
 reduction in main field flux
 reduces the terminal voltage
 commutation

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

  √Ia.
  1/Ia.
  Ia.
  Ia2.

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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

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

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Electrical Machines
In one 132 / 33 kV transformer the LV resistance is 0.02 per unit. The resistance referred to HV side is

  0.02 pu.
 0.01 pu.
  0.08 pu.
 0.16 pu.

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