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Electrical Machines

Electrical Machines
When flux density is constant in a transformer, hysteresis loss varies as

 V²
 V
 f²
 f

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Electrical Machines
A 220 V DC machine has an armature resistance 1Ω. If the full load current is 20 A, the difference of induced voltage and generator is

 20 V.
 0 V.
  40 V.
 60 V.

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Electrical Machines
In a DC series generator, the terminal voltage with increase in load will

 decrease
 increase to rated voltage and then may decrease
 increase gradually and then stay at rated voltage
 remain nearly constant

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Electrical Machines
When a short circuit test on a transformer is performed at 25 V, 50 Hz, the drawn current is I1. If the test is performed by 25 V and 25 Hz and power drawn current is I2, then

 I1 = I2
 I1 > I2
None of these
 I1 < I2

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Electrical Machines
A DC generator beyond critical resistance will generate

 maximum power.
 maximum voltage.
 maximum current.
 no voltage.

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Electrical Machines
Which of the following methods are used to control the speed of DC motors is

 field current control
 supply voltage control
All of these
 armature circuit resistance control

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MORE MCQ ON Electrical Machines

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