GATE ME 2021 Set 2 — Question 42
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Theory of Machines & Vibrations → Cams, Gears & Gear Trains → Simple, Compound & Epicyclic Trains
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Question
A power transmission mechanism consists of a belt drive and a gear train as shown in the figure.
Diameters of pulleys of belt drive and number of teeth () on the gears 2 to 7 are indicated in the figure. The speed and direction of rotation of gear 7, respectively, are
Correct answer
(A) 255.68 rpm; clockwise
Solution
1.Belt Drive: Input speed (clockwise). Pulley 1 diameter , Pulley 2 diameter .
(clockwise).2.Gear Train: Gear 2 is on the same shaft as Pulley 2, so (clockwise).
Gear 2 () meshes with Gear 3 (). (anticlockwise).Gear 4 () is on the same shaft as Gear 3, so (anticlockwise).
Gear 4 meshes with Gear 6 (). (clockwise).
Gear 7 is on the same shaft as Gear 6, so (clockwise).
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