Chemical Engineering Materials of Construction MCQ Test - Set 22 - ObjectiveBooks

Chemical Engineering Materials of Construction MCQ Test - Set 22

Practice Test: Question Set - 22

1. Addition of __________ to the steel helps in increasing the residual magnetism in steel used for making magnets.
    (A) Chromium
    (B) Nickel
    (C) Tungsten
    (D) Cobalt

2. Duralumin is an alloy of
    (A) Aluminium, copper and manganese
    (B) Aluminium, nickel and silicon
    (C) Aluminium and nickel
    (D) None of these

3. Caustic soda can be stored in __________ drums.
    (A) Steel
    (B) Cast iron
    (C) Brass
    (D) Gun metal

4. Ceramic materials
    (A) Are exemplified by clay and mica
    (B) Are poor electrical conductors due to lack of free electrons
    (C) Never exhibit polymorphism
    (D) All (a), (b) and (c)

5. Which of the following is universally employed as the low expansion metal in the bimetallic thermometer, which is an iron-nickel alloy containing 36% nickel and has very low co-efficient of expansion (1/20th of ordinary metals) ?
    (A) Invar
    (B) Constantan
    (C) Chromel
    (D) Alumel

6. Which of the following stainless steels is non-magnetic?
    (A) Ferritic
    (B) Martenistic
    (C) Austenitic
    (D) None of these

7. The temperature at which new grains are formed in the metal is called the __________ temperature.
    (A) Eutectic
    (B) Recrystallisation
    (C) Upper critical
    (D) Lower critical

8. Chrome vanadium steels usually contain 0.8 to 1.1% Cr, 0.25 to 0.35% C and < 0.25% V. It is
    (A) Used for making axle & shafts of aeroplanes, automobiles and locomotives
    (B) Having poor fatigue resistance
    (C) Having poor toughness
    (D) Not helpful in producing cleaner steel due to oxidizing action of vanadium

9. The main purpose of galvanizing iron sheets is to
    (A) Harden the surface
    (B) Increase its glossiness and luster
    (C) Prevent the action of water
    (D) Prevent the action of oxygen

10. The most commonly used resin for making reinforced plastic is
    (A) Unsaturated polyester
    (B) Polypropylene
    (C) Polyurethane
    (D) Nylon-6

11. Presence of high amount of silicon in cast iron
    (A) Suppresses the decomposition of Fe3 C
    (B) Increases the formation of graphite
    (C) Increases the contraction of the metal
    (D) Reduces its fluidity

12. Cast iron has
    (A) High ductility
    (B) High malleability
    (C) Very high tensile strength
    (D) Its elastic limit very close to ultimate breaking strength

13. Lead pipes are not safe for carrying drinking water because water containing dissolved oxygen attacks lead thereby forming poisonous Pb (OH)2. Lead pipes are readily corroded by
    (A) Dilute HCI
    (B) Acetic acid
    (C) Concentrated H2SO4
    (D) None of these

14. Aluminium alloy is one of the most suitable materials of construction for aircrafts mainly due to its
    (A) High strength to weight ratio
    (B) Low temperature strength properties
    (C) Its ability to be cast, rolled, forged & stamped
    (D) High strength and corrosion & oxidation-resistance at elevated temperature

15. Tin vessels are corroded by
    (A) Anhydrous ammonia
    (B) Aromatic solvents
    (C) Synthetic detergent solution
    (D) None of these

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