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Electrical Machines

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

 25 ppm.
 45 ppm.
  35 ppm.
 20 ppm.

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Electrical Machines
What is the emf generated by a 4 pole Lap connected DC Motor rotating at 1500 rpm having 1000 conductors and useful flux per pole is 0.4 mWb.

 40 volts.
 30 volts.
 20 volts.
 10 volts.

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

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

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Electrical Machines
Slot wedges in a dc machine is made up of

 mild steel.
 silicon steel.
 cast iron.
 fibre.

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Electrical Machines
For P pole machine relation between electrical degrees and mechanical degrees is

 θelec = 2/P*θmech
 θelec = P/2*θmech
 θelec = θmech
 θelec = 4/P*θmech

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Electrical Machines
Hunting in a synchronous motor takes place

  when supply voltage fluctuates.
  when load varies.
  when power factor is unity.
  motor is under loaded.

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