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Electrical Machines

Electrical Machines
A 100/10, 50 VA double winding transformer is converted to 100/110 V auto transformer. The rating of auto transformer is

 500 VA
 550 VA
 110 VA
 100 VA

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Electrical Machines
For higher values of armature, the speed of a DC series motor is

 Proportional to armature current.
  Constant.
 Proportional to the square of armature current.
 Inversely proportional to armature current.

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Electrical Machines
Which type of motors are used for lathes?

 DC shunt motors.
 Either A or B.
 Synchronous motor.
 Cage induction motor.

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Electrical Machines
In one 132 / 33 kV transformer the LV resistance is 0.02 per unit. The resistance referred to HV side is

  0.08 pu.
 0.01 pu.
  0.02 pu.
 0.16 pu.

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Electrical Machines
The voltmeter connected across a generator reads voltage same at no load and at full load (rated). The generator is of the type

 series generator.
  shunt generator.
  level compound.
  short - shunt generator.

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Electrical Machines
For 250 volt DC Shunt Motor the armature and field resistance are 0.5 ohm and 250 ohm respectively. What will be the back e.m.f. produced when it takes a load current of 21A.

 280 V.
 240 V.
 150 V.
 220 V.

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