Discussion
In a multiple disc clutch, n1 and n2 are the number of discs on the driving shafts respectively. The number of pairs of disc on the drive shaft is :
Answer: C
The number of pairs is \(n_1 + n_2 - 1\).
In a multiple disc clutch, discs on the driving shaft alternate with discs on the driven shaft. Every adjacent pair of discs forms one pair of contact surfaces, and with \(n_1 + n_2\) discs stacked alternately there is one fewer interface than there are discs:
\[ n = n_1 + n_2 - 1 \]
The torque transmitted is proportional to this number. \(n_1 + n_2\) counts the discs, not the pairs, \(n_1 + n_2 + 1\) overcounts further, and \(\frac{n_1 + n_2}{2}\) would treat each disc as pairing with only one other.
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