1. Is it possible to completely relieve the residual stresses in a cast steel product?
a) True
b) False
Explanation: Solidification results in great amount of residual stresses.
2. Poor fluidity and contraction are compulsory to be taken into consideration while designing a cast steel product.
a) True
b) False
Explanation: Contraction affects to quite a extent in cast steel.
3. In alloy 4450, 2nd digit represents?
a) average percentage of major alloying elements, halved and rounded off
b) average percentage of major alloying elements
c) average percentage of minor alloying elements, halved and doubled
d) average percentage of minor alloying elements
Explanation: Second digit is used to represent major alloying element.
4. In alloy 4450, 4 represents?
a) Silicon
b) Aluminium
c) Manganese
d) Zinc
Explanation: In alloy nomenclature,1=Al;2=Cu;3=Mn;4=Si;5=Mg
5. An aluminium alloy casting with 9.8% Cu, 1.0% Fe and 0.25% Mg
a) Alloy 2585
b) Alloy 3586
c) Alloy 2686
d) Alloy 3584
Explanation: 1st digit=2(Copper) ; 2nd digit=9.8/2=5 ;3rd digit=8(Iron); 4th digit=5(Magnesium).
6. Ceramics consist of
a) ionic & covalent bonding
b) covalent bonding
c) hydrogen bonding
d) none of the mentioned
Explanation: Ceramics consists of ionic and covalent bonds only.There is no hydrogen compound so no case of H boding.
7. All ceramics contain clay.
a) True
b) False
Explanation: No this may sound convincing but all ceramics don’t contain clay.
8. The densities of ceramics are low.
a) True
b) False
Explanation: In ceramics, different oxides and carbides are not compactly bonded.
9. There are small voids in ceramics structure.
a) True
b) False
Explanation: Compounds are less compactly bonded and hence voids are formed.
10. Which of the following properties are true for ceramics.
a) light weight construction with low inertia force
b) excellent wear
c) lower friction loss
d) all of the mentioned
Explanation: Properties of ceramics.