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Electrical Machines

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

  35 ppm.
 20 ppm.
 45 ppm.
 25 ppm.

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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The external resistance to be added in the armature circuit to limit the armature current to 125% of its rated value is

 15.1 Ω
 31.9 Ω
 31.1 Ω
 15.9 Ω

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Electrical Machines
In a single phase transformer the magnitude of leakage reactance is twice that of resistance of both primary and secondary. With secondary short circuited, the input power factor is

 1/3
 1/√5
 1/√2
 2/√5

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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

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

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Electrical Machines
A 230 V dc series generator is driven at its rated speed. The no-load voltage across its armature terminals would be

 6 V
 somewhat less than 230 V
 230 V
 somewhat more than 230 V

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Electrical Machines
The core flux in transformer depends mainly on

 supply voltage, frequency and load
 supply voltage
 supply voltage and frequency
 supply voltage and load

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