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Electrical Machines

Electrical Machines
The torque speed characteristics of a AC servomotor is approximately

 hyperbola
 parabola
 linearised
 any of the above

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Electrical Machines
A 240 V dc series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 Ω. The value of resistance which must be added to obtain rated torque at 1000 rpm is

 6 Ω
 1.9 Ω
 5.7 Ω
 2.2 Ω

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Electrical Machines
DC machine is a

 conduction machine.
 none of above are correct.
 both are correct.
 convection machine.

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Electrical Machines
If we increase the rotor reactance value, the maximum torque will

 decrease
None of these
 not changed
 increase

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Electrical Machines
Slip rings of an induction motors are made of

  carbon.
  phosphor bronze.
  aluminium.
  stainless steel.

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Electrical Machines
CRGO steel is used in the core of transformer to reduce

  hysteresis loss.
 eddy current loss.
 both eddy current and hysteresis loss.
 ohmic loss.

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MORE MCQ ON Electrical Machines

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