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Electrical Machines

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

 25 ppm.
 20 ppm.
 45 ppm.
  35 ppm.

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Electrical Machines
Maximum power developed by a synchronous motor depends on

 supply voltage and load angle
 supply voltage, load angle and excitation
 excitation and load angle
 supply voltage and excitation

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Electrical Machines
Two DC series motors are connected in series and are driving the same mechanical load. If the motors are now connected in parallel the speed will become

 half.
 4 times.
 double.
 one fourth.

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Electrical Machines
The type of DC motor generally used for shears and punches is

 Differential compound motor.
 Series motor.
 Shunt motor.
 Cummulative compound motor.

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Electrical Machines
The power factor of squirrel cage induction motor is

 low at rated load only
 both A and B
 low at heavy loads only
 low at light loads only

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Electrical Machines
What is/are the necessary conditions for parallel operation of alternators?

 Terminal voltage is same
 Speed of alternators should be same
 Both 1and 2
 Frequency should be same

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