JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B. Tech II MECHANICAL TECHNOLOGY Previous Question Paper (April/May - 2023 - R13)
Note: i) Question paper consists of Part A, Part B.
ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions.
iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
Part A
What are the different followers used in practice?
Answer
Followers are classified based on surface contact as knife-edge, roller, flat-faced, and spherical-faced followers. Based on motion, they are classified as reciprocating (translating) or oscillating (rocking) followers.
What is the difference between radial cam and cylindrical cam?
Answer
In a radial cam, the follower moves in a direction perpendicular to the cam axis of rotation. In a cylindrical cam, the follower moves in a direction parallel to the cam axis of rotation.
What are the advantages of chain drive over belt drive?
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How the belt drives are classified?
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What are the advantages and limitations of gear drive?
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Differentiate between circular pitch and diametral pitch.
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What are the advantages of two stroke engines?
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Where C.I. engines are preferred over S.I. engine?
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What are the applications of compressed air?
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What are the advantages of reciprocating compressor?
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Part B
Sketch and explain the cam mechanism and mention its applications.
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What are the advantages and limitations of radial cam over wedge cam?
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Draw the profile of a cam operating knife edge follower with the following data out stroke during 120° of cam rotation. Dwell for the next 40° of rotation. Return stroke during 120° of rotation. Dwell for the remaining 80° of rotation. The stroke of the follower is 25 mm and minimum radius of cam is 25 mm. The follower moves with uniform velocity during out stroke and return stroke. The axis of the follower passes through axis of cam.
Answer
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Differentiate between V-belt drive and chain drive indicating the advantages, limitations and applications.
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Derive an equation to find the length of cross-belt drive.
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What are the various materials used for belts and explain the importance of leather over other materials?
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Derive an equation to find the ratio between tight side and slack side tensions of the belt.
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What is meant by interference of gears and mention the methods to avoid it?
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Explain about circular pitch, module and clearance as applied to gears.
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Sketch and explain the construction and working of simple gear trains and compound gear train.
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Why differential gear box is necessary in automobile?
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Explain the importance of piston, connecting rod, and cam shaft used in I.C. engines.
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How the I.C. engines are classified and mention their applications?
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Differentiate between two-stroke and four stroke cycle engines mentioning principle of working advantages and applications.
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Explain different alternate fuels and their advantages.
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Differentiate between rotary and reciprocating compressor mentioning principle of working and applications
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Derive an equation to compress one kg of air in reciprocating air compressor without clearance.
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What are the advantages of inter cooling in multi stage compressors?
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What are the advantages and draw backs of axial flow compressor over centrifugal compressor?
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