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Chemical Engineering - Materials and Construction

Exercise : Materials and Construction - Section 3
36.
Ball bearings are normally made of __________ steel.
high speed
high carbon
chrome
silicon
Answer: Option
Explanation:
No answer description is available. Let's discuss.
37.
The electrical conductivity of a __________ decreases with rise in temperature.
metal/alloy
semi-conductor
dielectric
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
38.
Which one occupies the lowermost position in the electromotive series of metals ?
Aluminium
Noble metals (Ag, Pt, Au)
Zinc
Alkali metals (K, Na, Li)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
39.
Addition of nickel to copper improves its
machinability
ductility
strength
hardness
Answer: Option
Explanation:
No answer description is available. Let's discuss.
40.
Presence of even 0.005% of __________ in copper makes it highly brittle, rendering it useless for wire-drawing.
oxygen
arsenic
antimony
bismuth
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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