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GATE 2020: Theory of Machine Quiz 3
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Question 1
Two involute gears in mesh have a module of 7.5 mm and pressure angle of 200. The gear has 60 and pinion has 32 teeth. The ratio of sliding to the rolling velocity at the pitch point, considering addenda on pinion and gear wheel as one module, will be
Question 2
Which one of the following is used to convert a rotational motion into a translational motion?
Question 3
In an epicyclic gear train, shown in the figure, the outer ring gear is fixed, while the sun gear rotates counterclockwise at 100rpm. Let the number of teeth on the sun, planet and outer gears to be 50, 25, and 100, respectively. The ratio of magnitudes of angular velocity of the planet gear to the angular velocity of the carrier arm is _________.
Question 4
A gear train is made up of five spur gears as shown in the figure. Gear 2 is driver and gear 6 is driven member. N2. N3, N4. N5 and N6 represent number of teeth on gears 2, 3, 4, 5, and 6 respectively. The gear(s) which act(s) as idler(s) is/are
Question 5
In the gear train of 1 : 10 as shown below, the pinion transmits 250 kW at 18000 rpm. What is the tangential load on the gear tooth?
Question 6
In the gear train shown, gear 3 is carried on arm 5. Gear 3 meshes with gear 2 and gear 4. The number of teeth on gear 2, 3, and 4 are 60, 20, and 100, respectively. If gear 2 is fixed and gear 4 rotates with an angular velocity of 100 rpm in the counter clockwise direction, the angular speed of arm 5 (in rpm) is
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