Measurement and Instrumentation
A bridge circuit is shown in the figure below. Which one of the sentence given below is most suitable for balancing the bridge?

 First adjust R4 and then adjust R2.
 First adjust R4 and then adjust R1.
 First adjust R2 and then adjust R4.
 First adjust R2 and then adjust R3.

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

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