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Wednesday, August 24, 2016

MBSTE DAE Materials and Manufacturing Processes 2015 Question Paper

University / Examination Board: Maharashtra State Board of Technical Education, Mumbai (MSBTE)
Yea of Examination: Winter 2015
Semester: Third
Scheme - G
Course Name: Diploma in Automobile Engineering DAE
Medium of Instructions: English
Time: 3 Hours
Marks 100
Subject: Materials and Manufacturing Processes
Subject Code: 17306

Instructions : (1) All Questions are compulsory.
 (2) Answer each next main Question on a new page.
 (3) Illustrate your answers with neat sketches wherever necessary.
 (4) Figures to the right indicate full marks.
 (5) Assume suitable data, if necessary.
 (6) Use of Non-Programmable Electronic Pocket Calculator is permissible.
 (7) Mobile Phone, Pager and any other Electronic Communication devices are not permissible in Examination Hall.
1. (A) Attempt any SIX of following : 12
 (a) State the classification of engineering materials.
 (b) List any two types of synthetic rubber. Give one application of each.
 (c) Write any two purposes of heat treatment.
 (d) Explain flame hardening process in brief.
 (e) List four hand moulding tools used in foundry.
 (f) State two functions of gating system.
 (g) Enlist types of cutting tools.
 (h) List any two accessories and attachments used on lathe machine.
(B) Attempt any TWO of following : 8
 (a) Differentiate between grey cast iron and white cast iron.
 (b) Why aluminium is useful material in industry ?
 (c) State thermosetting plastic and thermoplastics. Write two applications of each.

2. Attempt any FOUR of following : 16
(a) Write composition of materials : (any two)
 (i) CS 50 Cr 1 V 20
 (ii) FG 35 Si 15
 (iii) Fe 410 CuK
 (iv) 15 C 8 Pb 25 T 14
 (b) State composition and applications of Babbitt metal.
 (c) State four properties and applications of ceramic material.
 (d) Draw Fe-C phase transformation diagram and show critical temperatures on it.
 (e) List types of annealing process. Write four purposes of annealing.
 (f) Explain induction hardening process with two advantages and applications.

3. Attempt any FOUR of following : 16
(a) What are different types of foundries ? Enlist two advantages and disadvantages of foundry process.
 (b) State four types of patterns. Draw a neat sketch of multipiece pattern.
 (c) State different types of allowances provided on patterns. Explain distortion allowance with neat sketch.
 (d) Enlist with meaning the standard accepted colour codes used for patterns.
 (e) List properties of moulding sand. Explain cohesiveness.
 (f) State types of cores. Explain balanced core with neat sketch.

4. Attempt any FOUR of following : 16
(a) Draw a neat sketch of gating system. State following terms :
 (i) Runner
 (ii) Pouring basin
 (b) Explain with neat sketch true centrifugal casting.
 (c) Draw a neat sketch of hot chamber die casting and write two advantages and disadvantages.
 (d) Sketch and explain two casting defects with causes and remedies.
 (e) Explain oblique cutting with neat sketch.
 (f) State types of chips. Explain any one type of chip with neat sketch.

5. Attempt any FOUR of following : 16
(a) Show nomenclature of single point cutting tool with neat sketch.
 (b) State four properties and purposes of cutting fluid.
 (c) Draw block diagram of lathe machine. Write function of tail stock and carriage.
 (d) How lathe machine is specified ?
 (e) Explain taper turning method by swiveling the compound rest method.
 (f) Write any four types of drilling machine. Draw a block diagram bench of drilling machine.
6. Attempt any FOUR of following : 16
(a) State different operations performed on drilling machine. Explain counter boring with neat sketch.
 (b) Compare between up milling and down milling.
 (c) State any eight types of milling machine.
 (d) Explain any one principal part of milling machine with neat sketch of columnand knee type milling machine.
 (e) List four types of milling cutter. Explain face milling cutter with neat sketch.
 (f) State four operations performed on milling machine. Explain T-slot milling operation with neat sketch.


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