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Electrical Machines

Electrical Machines
The constant losses in transformer is/are

 hysteresis loss.
 copper loss.
 both 2 and 3.
 eddy current loss.

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Electrical Machines
If Pi and Pc represent core and full load copper loss respectively, the maximum KVA delivered to load corresponding to maximum efficiency is equal to rated KVA is

 √(Pi/Pc)
 Pi/Pc
 Pc/Pi
 (Pi/Pc)2

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Electrical Machines
In travelling cranes for hoisting and lowering which type of motor is preferred?

  Single phase induction motor.
  DC series motor.
  Synchronous motor.
  AC slip ring motor.

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Electrical Machines
In case of DC shunt motor if load is reduced

 The speed will increase abruptly.
 The speed will increase in proportion to reduction in load.
  The speed will remains almost constant.
 DC Shunt Motor

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Electrical Machines
If the speed of a dc motor increases with load torque, then it is a

 series motor
 differentially compounded motor
 comulatively compounded motor
 permanent magnet motor

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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

 100W
 3000W
 500W
 1000W

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