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Electrical Machines

Electrical Machines
From no load to full load the slip will

 not change.
None of these
 slightly increase.
 slightly decrease.

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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.

 220 V.
 240 V.
 150 V.
 280 V.

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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

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

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

 1450W
 1920W
 2000W
 1820W

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Electrical Machines
If an additional resistance is connected in series with a DC motor operating at rated speed, the speed of the motor will

  Remain unaltered.
  Reduce.
  Oscillate around the normal speed.
  Increase.

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Electrical Machines
In shunt dc motor the direction of rotation of the motor will reversed. When

  only field terminals are changed.
  either field terminals are reversed or armature terminals are reversed.
  none of above.
  only armature terminals are reversed.

ANSWER DOWNLOAD EXAMIANS APP
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