Name of the University : Jadavpur University
Department : Power Engineering
Degree : B.E
Subject Name : Material and Processes
Year/Sem : II/II
Website : jaduniv.edu.in
Document Type : Model Question Paper
Download Model/Sample Question Paper : https://www.pdfquestion.in/uploads/dspace.jdvu.ac.in/6159-Material%20and%20Processes.pdf
Material and Processes Question Paper :
Bachelor Of Engg. Power Examination, 2012 :
(2nd Year, 2nd Semester)
Time : Three hours.
Full Marks : 100 (50 marks for each part)
Use a separate Answer-Script for each part. :
Related : Jadavpur University Theory of Machines & Machine Design B.E Question Paper : www.pdfquestion.in/6157.html
PART – I :
Answer q.no.1 and any four from the rest. :
1. (a) Describe annealing process of heat treatment.
(b) Sketch and label a typical TTT curve for a plain carbon steel.
(c) Describe the precautions which must be taken in the operation of Brinell hardness test.
(d) Explain the yield point behaviour of Ductile material
(e) Show how the rate of cooling affects the macrostructure of an ingot.
(f) Show the dendritic growth of matallic crystals from the liquid state.
(g) Draw the potential energy diagram for the interactions of two atoms.
(h) What is the difference between stip and twinning
(i) Explain the term numerical aperture and resolving power of object. 9×2
2. (a) Distinguish between crrep and stress relaxiation.
(b) Distinguish between crystalline solids and amorphous solids.
(c) Distinguish between hardness and toughness. 8
3. (a) A 20cm long rod with a diameter 20mm is loaded with a 4000N weight. If the diameter decreases to 18mm. Compute the true stress and true strain at this load.4
(b) The temperature of 1kg of the alloy is lowered slowly until the liquid-solution composition is 18 wt% B and the solid-solution composition is 66wt% B. Calculate the amount of each phase. 4
4. What are the materials of the items given below and why?
(a) Water level indicator
(b) Pressure cooker
(c) Fork end of Knuckle joint
(d) Down rod of ceiling fan
(e) Punch
(f) Steering
5. During a bend test of commercial plywood (IS 710) the following data were obtained. 8
(a) Width of sample 50mm
(b) Thickness of sample 12mm
(c) Span length of sample = 24 x thickness of sample
(d) Maximum load 1000 N
(e) Load at proportional limit 800 N
(f) Deflection at proportional limit 20mm
Determine (a) Modulus of elasticity (b) Modulus of rupture.
6. (a) Define thermal shock. 2
(b) In a laboratory creep experiment at 1000°C, a steady state creep rate of 5×10–1% per hour is obtained in a metal alloy. The creep mechanism for this alloy is known to be dislocation climb with an activation energy of 200KJ/mol. Predict the creep rate at a service temperature of 600°C. (Assume that the lab experiment duplicated the service stress). 6
7. During a Rockwell hardness test on a standard test block for HRC 65.5 (U= ±2.84 HRC at 95% C.L). The following test results were obtained from the standard test block. Observed hardness, HRC=66,65,64,65 and 64, Extimate the hardness (HRC) with uncertainty. Assume i) Resolution of Rockwell hardness testing machine 1 HRC ii) Uncertainty of measurement of Rockwell hardness testing machine from calibration certificate 0.5 HRC. 8
PART – II :
Answer q.no. 8 and any three questions. :
8. Write the correct answer (any fourteen) 14×1
(i) viii what will be the minimum batch size for Al alloy gravity die casting?
(a) 20-30 (b) 70-100 (c) 80,000-1,00,000 (d) 3000-4000
(ii) Compacting is a manufacturing step in–
(a) Sand casting (b) extrusion (c) power metallurgy (d) heat treatment.
(xi) Powder metallurgy is used to produce components from–
(a) Powdered metal (b) powdered alloy (c) powdered metal and alloy (d) molten metal and alloy
(xii) 25 H8 holes can be produced by–
(a) Drilling (b) Riming (c) Boring (d) none.
(xiii)The principal property required for good quality extrusion
(a) Higher hardness (b) Higher ductility (c) higher malleability (d) none
(xiv) Which one of the following is not a single point cutting tool?
(a) turning tool (b) milling cutter (c) boring tool (d) parting tool
(xv) Combination of rotating job and non-rotating tool is used in–
(a) lathe (b) vertical milling (c) shaping (d) surface grinding
(xvi) Which is the oldest form of metal manufacturing process?
(a) casting (b) presswork (c) machining (d) welding.
(xvii) Which of the following can produce highest accuracy?
(a) drilling (b) turning (c) milling (d) cylindrical grinding
(xviii) Maximum metal removal in one step is done by–
(a) lathe (b) milling (c) planing (d) drilling
(xix) Which of the following is most productive for mass production items.
(a) Center a lake (b) Drilling machine (c) Milling machine (d) Broadching machine.
(iii) What is the single major difference between sand casting and plster casting?
(a) riser is not required in plster casting (b) cores are not used in plaster casting (c) molding material is different (d) none
(iv) A 20 L plastic bucket is produced by –
(a) Injection moulding (b) blow moulding (c) vacuum forming (d) none.
(v) Which process you will follow to produce 2000kgs of 1.2mm dia medium carbon steel wire –
(a) Cold extrusion (b) cold rollign (c) wet drawing (d) hot extrusion.
(vi) Which mechanical property of metal helps higher deformation in hot foring–
(a) density (b) ductility (c) hardness (d) malleability
(vii) Cold rolling is preferred to hot rolling for producing –
(a) blooms (b) I-beams (c) thin sheets (d) rail sections
(viii)Work hardening is most associated with which manufacturing process –
(a) centrifugal casting (b) powder metallurgy (c) cold rolling (d) none
(ix) Which process will you adopt to produce one number complicated machine frame weighing 825kgs?
(a) impression die foring (b) pressure die casting (c) sand casting (d) net shape forging
(x) Which welding process is used for producing LPG cylinders?
(a) SMAW (b) GMAW (c) FCAW (d) SAW
(xx) 100000 numbers of a job– 100mm O.Dx80mm I.D.x0.5mm thick mild steel washers can be most cheaply produced by–
(a) Machining (b) Power Press (c) Casting (d) Forging.