Question

Cost of maintenance of Wheatstone bridge is _________

(a) low

(b) high

(c) depends on the components

(d) depends on the source e.m.f

I had been asked this question in an interview.

The origin of the question is Limitations of Wheatstone Bridge topic in section Measurement of Resistance of Electrical Measurements

Answer 1

The correct answer is (b) high

To elaborate: As the resistance must have a tolerance of upto 1%, cost of maintenance of the Wheatstone bridge circuit is expensive. Voltage source does not add to the cost of maintenance of a Wheatstone bridge as it is uniform for all bridge circuits.