Multiple Choice Questions and Answers (MCQ) on Chemical Engineering Materials and Construction
01. A metallic alloy in general as compared to their pure metal components is
(A) More corrosion resistant
(B) Having higher melting point
(C) Having lower hardness, reactivity and fusibility
(D) Having lower electrical conductivity
Answer: Option A
02. Which of the following will have the highest melting point?
(A) Pig iron
(B) Mild steel
(C) Wrought iron
(D) High carbon steel
Answer: Option C
03. Which of the following is produced by addition polymerisation?
(A) Polybutadiene
(B) Phenol formaldehyde
(C) Urea-formaldehyde
(D) Dacron
Answer: Option A
04. Containers made of high silicon cast iron (14% Si) are not suitable for the storage of
(A) Acetic acid
(B) Benzoic & boric acids
(C) Phosphoric acid (95%) & sulphuric acid (95%)
(D) Hydrochloric acid (concentrated)
Answer: Option D
05. Cast iron is
(A) Used for making shock resisting parts
(B) Manufactured in cupola and is brittle
(C) Having compressive strength more than its tensile strength
(D) All (A), (B) & (C)
Answer: Option D
06. Alinco, which is a aluminium-cobalt-nickel steel, is used for making
(A) Surgical instruments
(B) Powerful magnets
(C) Chemical equipments
(D) Boiler tubes
Answer: Option B
07. Maximum carbon content in cast iron is __________ percent.
(A) 3.8
(B) 5.2
(C) 4.8
(D) 4.3
Answer: Option D
08. Which of the following comprises of hydrocarbons?
(A) Mica flakes
(B) Glass
(C) Rubber
(D) None of these
Answer: Option C
09. Sulphuric acid is mixed with ground phosphate rock (to produce phosphoric acid) in a steel digestor lined with
(A) Acidic refractory
(B) Rubber
(C) Karbate
(D) Lead or acid-proof bricks
Answer: Option D
10. The softest material just next to talc in the Mho’s scale is
(A) Quartz
(B) Gypsum
(C) Feldspar
(D) Fluorite
Answer: Option B
11. __________ iron is produced, when molten pig iron is allowed to cool gradually.
(A) White cast
(B) Grey cast
(C) Wrought
(D) None of these
Answer: Option B
12. ‘Age hardening’ of duralumin is due to
(A) Copper
(B) Magnesium
(C) Both (A) & (B)
(D) Neither (A) nor (B)
Answer: Option C
13. Reduction in the grain size reduces the __________ of the material.
(A) Fatigue resistance
(B) Tensile strength
(C) Creep resistance
(D) All (A), (B) & (C)
Answer: Option C
14. Pick out the wrong statement.
(A) The toughness of a material decreases, when it is heated
(B) Crane hooks are normally made of wrought iron
(C) Cold working of a metal decreases its fatigue strength
(D) The temperature at which new grains are formed in a metal is known as the recrystallisation temperature
Answer: Option C
15. Ferric stainless steels compared to austenitic stainless steels
(A) Have lower corrosion resistance
(B) Are harder to fabricate
(C) Are less ductile and hence less suitable for cold pressing
(D) All (A), (B) and (C)
Answer: Option D
16. In cold working of metal as compared to its hot working
(A) Cracks and blow holes are eliminated
(B) Ductility and impact strength improves
(C) Appreciable strain hardening is produced
(D) Yield stress, hardness and fatigue strength is not at all affected
Answer: Option C
17. Which one occupies the lowermost position in the electromotive series of metals?
(A) Aluminium
(B) Noble metals (Ag, Pt, Au)
(C) Zinc
(D) Alkali metals (K, Na, Li)
Answer: Option B
18. ‘Semi steel’ is
(A) Produced by adding 10-20% steel to the cupola charge
(B) Stronger than cast iron
(C) Both (A) and (B)
(D) Neither (A) nor (B)
Answer: Option C
19. Spark plugs are made of
(A) High alumina ceramic
(B) Metallic carbides
(C) Corundum
(D) Carborundum
Answer: Option A
20. How many molecules per unit cell are there in a face centred cubic lattice?
(A) 2
(B) 4
(C) 6
(D) 8
Answer: Option B
21. The crystal structure of most of the common metals is
(A) Orthorhombic
(B) Cubic
(C) Hexagonal
(D) None of these
Answer: Option B
22. Non-ferrous metals and hard steels do not exhibit a definite yield point, when pulled in the testing machine and hence for these cases, a better measure of their elastic properties is defined by the __________ stress.
(A) Ultimate
(B) Yield point
(C) Proof
(D) None of these
Answer: Option C
23. Lead pipe is
(A) Especially resistant to solutions containing H2SO4
(B) Usually joined by burning (e.g. by melting to adjacent pieces with a torch)
(C) Having very low elastic limit resulting in permanent deformation from either mechanical or thermal strain
(D) All (A), (B) and (C)
Answer: Option D
24. __________ is a donor impurity for semi-conductors.
(A) Boron
(B) Antimony
(C) Gallium
(D) None of these
Answer: Option B
25. Pick out the wrong statement.
(A) Pure rubber is as useless as pure gold as a material of construction
(B) Thermal conductivity of aluminium is higher than that of copper; hence it is increasingly used for utensil making
(C) Copper has poor weldability
(D) Reinforced plastics are made from both thermoplastic as well as thermosetting plastics
Answer: Option B