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Roll No.
Total No. of Pages : 02
Total No. of Questions : 18
B.Tech. (ME) (2012 Onwards) (Sem.=5)
DESIGN OF MACHINE ELEMENTS-I
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Subject Code : BTME-501
M.Code : 70602
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
- SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
- SECTION-B contains SIX questions carrying TEN marks each and students have to attempt any FOUR questions.
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SECTION-A
Answer briefly : (2x10=20)
- What are the advantages of hollow shafts over solid shafts?
- Define Factor of Safety.
- How stress concentration is reduced?
- What is Fit and tolerance?
- What is Tearing and Crushing?
- What is spring Index?
- Define Creativity. Write various steps in creative process.
- What is fatigue failure? How it happens?
- What is a sunk key? Also name the various types of sunk keys.
- What do you understand by leverage?
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SECTION-B
- Discuss the various factors to be considered for the selection of materials for the design of machine elements.
- a) Make a neat sketch of foot lever. Explain its design procedure in detail.
- b) Design a knuckle joint to transmit 150 kN. The design stresses may be taken as 75 MPa in tension, 60 MPa in shear and 150 MPa in compression.
- a) Determine the length and thickness of a sunk key for a shaft of 0.09 m diameter. Assuming that, the shearing resistance of the material of the key is the same as that of the shaft. Width of the key is 25 mm and f5 = 0.4 x fc.
- b) Design an oval flanged pipe joint for a pipe having 50 mm bore. It is subjected to an internal fluid pressure of 7 N/mm². The maximum tensile stress in the pipe material is not to exceed 20 MPa and in the bolts 60 MPa.
- Find the diameter of a solid steel shaft to transmit 20 kW at 200 r.p.m. The ultimate shear stress for the steel may be taken as 360 MPa and a factor of safety as 8. If a hollow shaft is to be used in place of the solid shaft, find the inside and outside diameter when the ratio of inside to outside diameters is 0.5.
- Draw the fatigue curve and discuss its importance in the design of a machine element.
- Two plates of 6mm thickness are to be joined by a double riveted zig-zag lap joint, if the allowable strength of ?t = 100 N/mm², t = 70 N/mm², ?c = 130 N/mm².
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NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any page of Answer Sheet will lead to UMC against the Student.
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This download link is referred from the post: PTU B.Tech Question Papers 2020 December (All Branches)