Material Testing B.E Question Paper : jaduniv.edu.in
Name of the University : Jadavpur University
Department : Printing Engineering
Degree : B.E
Subject Name : Material Testing
Year/Sem : IV/II
Website : jaduniv.edu.in
Document Type : Model Question Paper
Download Model/Sample Question Paper : https://www.pdfquestion.in/uploads/dspace.jdvu.ac.in/5437-MATERIAL%20TESTING_Seme1_2006.pdf
Material Testing Question Paper :
B. Printing Engg. Part-I Examination, 2006 :
( 1st Semester )
Time : Three hours Full Marks : 100
Related : Jadavpur University Color Management System B.E Question Paper : www.pdfquestion.in/5433.html
( 50 marks for each part )
Use a separate answer-script for each part. :
PART—I :
Answer question no. 1 and any two from the rest.:
1. Differentiate between (any five): 2 × 5=10
(a) Short term ink testing and Long term ink testing
(b) Quickset and Heatset inks
(c) Mechanical dot gain and Optical dot gain
(d) Hue error and grayness
(e) Pigment and dyestuff
(f) Blocking and Set-off
(g) Slurring and Doubling.
2. What are the properties tested by following instruments and how these are measured ? 5 × 4=20
(a) Hegmann Gauge
(b) Prafbau Lithomat
(c) Inkometer
(d) Duke Tester.
3. (i) Define 2×5= 10
(a) Ink misting
(b) Thixotropy
(c) Set-off
(d) Print Contrast
(e) Dot gain.
(ii) What happens when 2×5=10
(a) Film-to-film frictional co-efficient is too low.
(b) Offset papers are kept in too damp atmosphere
(c) Offset papers contain water soluble material
(d) pH of water-based ink is too high
(e) A glass rod is first immersed in a solution containing epoxy resin and is streaked on to a filter paper.
4. (a) A gravure ink has the following ingredients :
Carbon Black, Acrylic Resin, Wax, Plasticiser. Describe how the ingredients can be separated and quantified by ink extraction scheme. 10
(b) How falling bar viscometer is used to measure viscosity of paste inks ? What are the factors on which ink misting depends ? 6 + 4=10
5. (a) How cylinder wear is measured for gravure ink ?
(b) How the drying time of litho ink is measured ?
(c) What are the factors on which drying time of litho ink depends ?
(d) How slip or static co-efficient of film-to-film is measured ?
(e) How can you identify ROSIN ?
(f) What will be the hue error and grayness of a cyan print whose Dr = l 46, Da=0.25 and Db=0.09. 4+2+4 + 4+2 + 4=20
PART—II :
Answer question no. 6 and any two from the rest. :
6. (a) What tests are done by the following instruments :
(i) Disc centrifuge
(ii) Grind gauge
(iii) Abel apparatus
(iv) Aniline point tester. 4
(b) What is bleach technique used in pigment testing ?
(c) How is viscosity of ink measured ? 2
(d) If the colour of oil or vernish darkens, what does it indicate ? 2
7. (a) What is smoothness of paper ? What factors affect smoothness ? How is it measured ? 9
(b) Differentiate between iodine value and diene value. 4
(c) Why melting range of resin is measured and How is it measured ? 7
8. (a) How is acid value of a resin tested ? 4
(b) Write a note on IR spectroscopy. 6
(c) What are the characteristics needed in online instruments for measurements of paper properties ? What properties are tested online ? 10
9. (a) Define :
(i) Bursting strength of paper
(ii) Viscosity of ink. 8
(b) How are the following properties measured online
(i) Moisture content of paper
(ii) Grammage. 6
(c) What is refractive index of a solvent ? How is it measured ? 6
Syllabus :
Material Testing :
1. Analysis of ink – chemical and instrumental techniques.
2. Pigment testing – size analysis – by microscope and centrifuge, Grind gauge to measure dispersion, Resistance tests – Resistance against acid, alkali, wax, soap, plasticised bleed, deep freeze etc.
3. Resin testing – acid value, hydroxyl value, solubility, melting range, color
4. Varnish and oil – iodine number, saponification no., water content, refractive index, diene value.
5. Solvent – Boiling range, relative density, flash point, aromatic content.
6. Short term ink testing – dispersion, viscosity, flow, strength, hue, opacity gloss.
7. Long term ink testing – Drying time and setting time.
8. Press performance test and printability.
9. Dry Print Performance tests – resistance tests, adhesion flexibility, slip, blocking, set-off, strike-through
10. Paper testing – Physical testing – grammage, thickness, density, smoothness, porosity, sizing. Strength testing -tensile strength, bursting strength etc.
11. Polymer testing – instrumental and chemical tests for identification and quantification.
12. Ink formulation using spectrophotometer