Measurement and Instrumentation
The function of shunt in an ammeter is to

Increase the sensitivity of the ammeter
None of the listed here
Increase the resistance of ammeter
By pass the current

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

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