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Electrical Machines

Electrical Machines
Iron losses in a DC machine are independent of variation in

  speed and voltage.
  voltage.
 speed.
  load.

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Electrical Machines
The total core loss of a 400 V, 50 Hz transformer is 2400W, when it is supplied by 200 V, 25 Hz loss is 800W. Calculate eddy current loss and hysteresis loss?

 1000W , 1400W
 1600W, 800W
 1400W, 1000W
 800W, 1600W

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Electrical Machines
A cumulatively compounded dc motor delivers rated load power at rated speed. If the series field is short-circuited, then

 both decrese
 Ia remains constant but ωm increase
 both armature current Ia and speed ωm increase
 Ia increases and ωm decreses

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Electrical Machines
The armature MMF waveform of a DC machine is

  sinusoidal.
  triangular.
  rectangular.
  pulsating.

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Electrical Machines
The core flux in transformer depends mainly on

 supply voltage
 supply voltage and load
 supply voltage and frequency
 supply voltage, frequency and load

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Electrical Machines
Which of the following will vary the maximum torque?

 rotor resistance R
None of these
 rotor reactance X
 both 1 and 2

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