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Electrical Machines

Electrical Machines
The supply voltage to an induction motor is reduced by 10%. By what percentage, approximately, will the maximum torque decrease?

 10%
 19%
 40%
 5%

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Electrical Machines
The starting resistance of DC motor is generally

 around 500 ohms.
  Low.
 1000 ohms.
 Infinitely large.

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Electrical Machines
In DC generator, the electricity produced in armature is

  armature is not present in DC generator.
  DC.
  AC.
None of these

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Electrical Machines
In double cage induction motor, the outer cage offers

  low resistance and high reactance.
  low resistance and low reactance.
  high resistance and high reactance.
  high resistance and low reactance.

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Electrical Machines
In a synchronous generator, if mechanical input is increased with constant excitation, the load angle will

 increase
 either increase or decrease
 decrease
None of these

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Electrical Machines
Minimum allowable resistivity of power transformer insulating oil is generally taken as

  1 X 1012 Ω - cm at 27°C and 0.1 X 1012
 4 X 1012 Ω - cm at 27°C and 0.4 X 1012
 3 X 1012 Ω - cm at 27°C and 0.3 X 1012
 2 X 1012 Ω - cm at 27°C and 0.2 X 1012

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