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# Design of transmission systems qb

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### Design of transmission systems qb

1. 1. Question bank 6 sem MECH Anna university DESIGN OF TRANSMISSION SYSTEMS UNIT-1PART - A1. Name the four types of belts used for transmission of power.2. What is wiping? How it can be avoided in belt drive?3. What are the materials used for V grooved pulleys?4. When do you prefer a wire rope drive?5. Write any four wire rope applications.6. How are wire ropes designated?7. List out the various stresses induced in the wire ropes.8. While designing a wire rope drive, always, a larger sleeve diameter is preferred justify the statement?9. Give any three applications of chain drives?10. What is backsliding in chain drives?11 What is a V flat drive?12 What do you mean by galling of roller chain?13 What do you mean by chordal action of chain drive?14 What is an offset in a roller chain?15 What type of belt would you prefer if the center distance between the pulleys is small?16 Define creep and slip in belts.17 Give some application of wire ropes18 What do you understand by simplex, duplex and triplex chain?Part B11. (i) A V- belt drive is to transmit 15kW to a compressor. The motor runs at 1150 rpm and thecompressor is to run at 400 rpm. Determine.1. Belt specifications2.Number of belts (8)(ii) A leather belt 125mm wide and 6mm thick, transmit power from a pulley with the angle of lap 150and =0.3. If the mass of1m3 of leather is 1mg and the stress in the belt is not to exceed 2.75 Mpa, findthe maximum power that can be transmitted and the corresponding speed of the belt. (8)12. It is required to select a flat belt drive for a fan running at 360rpm.which is driven by a 10kw,1440rpm motor. The belt drive is open type and space available for a center distance of 2mapproximately. The diameter of a driven pulley is 1000mm. (16)13. Design a belt drive to transmit20kw at 720rpm aluminium rolling machine, the speed ratio being 3.The distance between the pulley is3m.diameter of rolling machine pulley is 1.2m. (16)14 A truck equipped with a 9.5 kw engine uses a roller chain as the final drive to the rear axle .Thedriving sprocket runs at 900 rpm and driven sprocket at 400rpm with center distance of approximately600mm.Select the roller chain. (16)15 A crane is lifting a load of 18 KN through a wire rope and a hook. The weight of the hook etc., is 10kN.The load is to be lifted with an acceleration of 1m/sec2. Calculate the diameter of the wire rope. Therope diameter may be taken as 30 times the diameter of the rope. Take a factor of safety of 6 andYoung’s modulus for the wire rope 0.8 x 105 N/mm2. The ultimate stress may be taken as 1800 N/mm2.The cross-sectional area of the wire rope may be taken as 0.38 times the square of the wire ropediameter. (16)16 Design a chain drive to actuate a compressor from 15kW electric motor running at 1,000 r.p.m, thecompressor speed being 350 rpm. The minimum centre distance is 500 mm. the compressor operates 15hours per day. The chain tension may be adjusted by shifting the motor (16)17 Design a chain drive to actuate a compressor from a 12 kW electric motor at 900 rpm, thecompressor begins 250 rpm. Minimum centre distance should be 500 mm, the chain tension may beadjusted by shifting the motor on rails. The compressor is to work 8 hour/day. (16)Powered by www.technoscriptz.com Page 1