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# Explain briefly the differences between simple

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Unformatted text preview: teeth and meshes with wheels D and E, each of which has 60 teeth. Find the speed and direction of E when A rotates at 200 r.p.m., if 1. D is fixed, and 2. D rotates at 100 r.p.m., in the same direction as A . In both the cases, find the ratio of the torques transmitted by the shafts of the wheels A and E, the friction being neglected. [Ans. 800 r.p.m. in the opposite direction of A ; 300 r.p.m. in the opposite direction of A ; 4 ; 1.5] Chapter 13 : Gear Trains l 479 DO YOU KNOW ? 1. 2. 3. 4. 5. 6. What do you understand by ‘gear train’? Discuss the various types of gear trains. Explain briefly the differences between simple, compound, and epicyclic gear trains. What are the special advantages of epicyclic gear trains ? Explain the procedure adopted for designing the spur wheels. How the velocity ratio of epicyclic gear train is obtained by tabular method? Explain with a neat sketch the ‘sun and planet wheel’. What are the various types of the torques in an epicyclic gear train ? OBJECTIVE TYPE QUESTIONS 1. In a simple gear train, if the number of idle gears is odd, then the motion of driven gear will (a) be same as that of driving gear (b) be opposite as that of driving gear (c) depend upon the number of teeth on the driving gear (d) none of the above 2. The train value of a gear train is (a) equal to velocity ratio of a gear train (b) reciprocal of velocity ratio of a gear train (c) always greater than unity (d) always less than unity 3. When the axes of first and last gear are co-axial, then gear train is known as (a) simple gear train (b) compound gear train (c) reverted gear train (d) epicyclic gear train 4. In a clock mechanism, the gear train used to connect minute hand to hour hand, is (a) epicyclic gear train (b) reverted gear train (c) compound gear train (d) simple gear train 5. In a gear train, when the axes of the shafts, over which the gears are mounted, move relative to a fixed axis, is called (a) simple gear train (b) compound gear train (c) reverted gear train (d) epicyclic gear train 6. A differential gear in an automobile is a ( a) simple gear train (b) epicyclic gear train (c) compound gear train (d) none of these 7. A differential gear in automobilies is used to ( a) reduce speed (b) assist in changing speed (c) provide jerk-free movement of vehicle (d) help in turning ANSWERS 1. ( a) 2. (b) 6. (b) 3. (c) 4. (b) 5. (d) 7. (d) GO To FIRST...
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