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Electrical Machines

Electrical Machines
If the applied voltage of a DC motor is 230 V, then back emf, for maximum power developed is

 200 V.
 460 V.
 115 V.
 230 V.

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Electrical Machines
Armature of DC machine is made of

 silicon steel.
 insulating material.
 conducting material.
 non-ferrous material.

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Electrical Machines
An auto transformer having a transformation ratio of 0.8 supplies a load pf 10 KW. The power transfered inductively from the primary to secondary is

 0.
  2 KW.
 8 KW.
 10 KW.

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Electrical Machines
The speed of a 50 Hz three phase induction motor under full load condition is 725 rpm the number of poles of the motor are ______________.

  2.
  8.
 4.
 6.

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Electrical Machines
A 440 V, 3-phase, 10 pole and 50 HZ synchronous motor delivering a torque of 50 N-m, delivers a power of

 500W
 100W
 3000W
 1000W

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Electrical Machines
Normally for the design of transformer the ambient temperature is taken as

 27°C.
  45°C.
 32°C.
 35°C.

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MORE MCQ ON Electrical Machines

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