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Electrical Machines

Electrical Machines
The heat generated in the transformer is dissipated mainly by

 conduction.
All of these
 radiation.
  convection.

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Electrical Machines
The breakdown torque of a synchronous motor varies as

 V²
 applied voltage V
 1/V
 1/V²

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Electrical Machines
Maximum allowable moisture content of power transformer insulating oil is generally taken as

 25 ppm.
  35 ppm.
 20 ppm.
 45 ppm.

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Electrical Machines
An induction motor has a rotor resistance of 0.002 Ω / phase. If the resistance is increased to 0.004 Ω / phase then the maximum torque will

 remain unaltered
 increase by 200%
 increase by 100%
 reduced to half

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Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor copper loss?

 80W
 40W
 100W
 60W

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Electrical Machines
In case of DC shunt motor if load is reduced

 The speed will increase abruptly.
 DC Shunt Motor
 The speed will increase in proportion to reduction in load.
  The speed will remains almost constant.

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MORE MCQ ON Electrical Machines

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