Punjab State Board of Technical Education and Industrial Training 2011 Diploma Mechanical Engineering Material Science - Question Paper

MATERIAL SCIENCE
third Exam/Mech/5348/0753/0536/Dec'11


part A
Q1. Do as directed: [15]
a. Lead is a ferous material. (T/F)
b. Wrought iron has less than 0.08% C. (T/F)
c. The main consitituent of Greu CT is ............
d. Copper has ............ sturcture.
e. Any material which indicates property of plasticity is capacity to ger deformed on change shape under pressure is called ............
f. The cork have a ............ sturcture.
g. High temperature tempering is performed at ............
h. The process of producing hard surface of nitrides on a soft core is called ............
i. Stiffness is the property by vitue of which the material resists deformations. (T/F)
j. The test which is based on the basis of the hardness of the metal is known as ............


part B
Note: Attempt any 6 ques. [6X5]
Q2. a. What do you mean by ceramies materials?
b. What is crystal structure?
c. What is cast iron?
d. Write down the wurces of wrought iron?
e. elaborate the limitaitons of non ferrous metals?
f. What do you mean by case hardening?
g. What do you mean by plastic casting?
h. Write short notes on rubber.


part C
Note: Attempt any 2 ques. [15X2]
Q3. Write short notes on appearance test, sound test, spark test, weight test and magnetic test?
Q4. Write in detail the term plastics? provide the properites of olastics in detail from engineering point of view?
Q5. Write down the properties and uses of bearing metals and solders.

Earning:   Approval pending.