driver pullen no pudley A belt driv...
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driver pullen no pudley A belt drive system is given in the figure such that distance between centres (00') = 120 cm and radii are 20 cm and 80 cm respectively. Length of the belt PQRS is equal to - (A) 120(+3) cm (C) 60(21+13)cm (B) 120(1 – 3)cm (D) 60(21-13)cm Length of the internal common tangent (AA) is equal to - (A) 44 V10 cm (B) 10/44 cm (C) 22/20 cm (D) 20/22 cm

JEE/Engineering Exams
Maths
Solution
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pences ( =sqrt{(20)^{2}-left(gamma_{B}-v_{A}right)^{2}} ) ( =sqrt{120^{2}-60^{2}} ) ( =sqrt{180 times 60} ) ( =frac{60 sqrt{3}=9 R}{120 sqrt{3}+120 pi} ) [ begin{array}{l}120(pi+sqrt{3}) mathrm{cm}end{array} ] pewemon ( A A^{prime}=sqrt{left(00^{prime}right)^{2}-left(r_{B}+V_{A}right)^{2}} ) ( =sqrt{120^{2}-100^{2}} ) ( =sqrt{20 times 220} ) ( =20 sqrt{11} ) ( =10 sqrt{44} mathrm{cm} ) (3) Ans
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