In a disc clutch, if there are n1 number of discs on the driving shaft and n2 number of discs on the driven shaft, then the number of pairs of contact surfaces will be
A. n1 + n2
B. n1 + n2 + 1
C. n1 + n2 - 1
D. n1 + n2 - 2
Answer: Option C
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Number of pairs of contact surfaces,
n = n1 + n2 – 1
n1= Number of discs on the driving shaft,
n2 = Number of discs on the driven shaft.