A compound gear train with gears P, Q, R and S has number of teeth 20, – McqOptions

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1.	A compound gear train with gears P, Q, R and S has number of teeth 20, 40, 15 and 20, respectively. Gears Q and R are mounted on the same shaft as shown in the figure below. The diameter of the gear Q is twice that of the gear R. If the module of the gear R is 2 mm, the center distance in mm between gears P and S is
A.	40
B.	80
C.	120
D.	160
Answer» C. 120

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