Measurement and Instrumentation
Some wire- wound resistors have bifilar winding. This type of winding is used to

Reduce the tolerance
Increase the thermal stability
Double the power rating of the resistor
Reduce the inductance of winding

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Measurement and Instrumentation
In DC potentiometer measurments, a second reading is often taken after reversing the polarities of the DC supply and the unknown voltage and the average of the two reading is taken. This is with a view of eliminate the effects of

 Stray magnetic fields.
 Errorneous standardisation.
  Stray thermal emfs.
 Ripples of the DC supply.

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