Maharashtra State Board of Technical Education 2009 Diploma Fabrication Engineering of Welding Technology - Question Paper

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Sample ques. Paper-I
Course : Fabrication Technology and Erection Engineering
Course Code : FC
Semester : Fourth
Subject : Welding Technology
Marks : 80 Time: three Hours
Instructions:
1. All ques. are compulsory.
2. Illustrate your answers with neat sketches wherever necessary.
3. Figures to the right indicate full marks.
4. presume suitable data if necessary.
5. Preferably, write the answers in sequential order.
Q.1 [A] ans any 4 of the following: 08 Marks
1) State any 4 reasons for weld distortion.
2) State the 2 objectives of stress relieving after welding.
3) How electric Arc is generated.
4) List out the kinds of weld joints
5) What is Cathode Spot?
Q.1 [B] ans any 2 of the following: 08 Marks
1) Draw a neat labelled sketch of carbide to water ethylene generator & state the chemical
formula of the process.
2) discuss the effects of current & voltage on arc welding process.
3) describe weldability & state 4 factors affecting it.
Q.2 ans any 3 of the following: 12 Marks
1) discuss with neat sketch the modes of metal transfer mechanism (any four)
2) discuss the weldability of the 3 kinds of stainless steel.
3) elaborate the causes of undercut & excessive spatter & how it can be eliminated.
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Q.3 ans any 3 of the following: 12 Marks
1) Differentiate oxygen & Acetylene cylinders with respect to (I)Construction (II)
size(III)fittings used on it (IV) colour
2) Draw the dynamic volt ampere characteristics of a D.C. welding power source state its
effect on arc stability
3) discuss the variation in current with neat labelled sketch of moving coil high reactance
welding transformer
4) State the specification of welding electrode & write the designation of every term
involved in it.
Q.4 ans any 4 of the following: 16 Marks
1) discuss the reasons for cold cracking & state the remedial procedures for it.
2) elaborate the issues encountered in welding of cast iron & state how it is overcome.
3) State the signification of DCSP & DCRP in arc welding
4) discuss any 2 factors affecting arc stability
5) Draw a neat labelled sketch of carburizing flame in oxyacetylene welding & state its
two uses.
6) State any 4 advantages & limitations of gas welding.
Q.5 ans any 3 of the following: 12 Marks
1) What id carbon equivalent (C.E) & state how it affects wedability
2) Draw a neat labelled sketch of the Heat affected Zone (HAZ) of a typical mild steel
welded structure.
3) State sequential procedure of brazing.
4) define flate & vertical welding positions with respect to i) electrode size ii) current
Q.6 ans any 3 of the following: 12 Marks
1) Write 4 limitations of soldering.
2) State the objectives of heat treatment in welding.
3) discuss the relationship ranging from welding & properties of copper.
4) Draw a neat sketch of any 4 braze joints.

Earning:   Approval pending.