Civil Engineering > GATE 2017 SET-1 > Surveying
The accuracy of an Electronic Distance Measuring Instrument (EDMI) is specified as ±(a mm + b ppm) Which one of the following statements is correct?
A
Both a and b remain constant, irrespective of the distance being measured.
B
a remains constant and b varies in proportion to the distance being measured.
C
a varies in proportion to the distance being measured and b remains constant.
D
Both a and b vary in proportion to the distance being measured.

Correct : b

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