Chemical Engineering Objective Type Questions Matls of Construction

5/25/2018 Chemical Engineering Objective Type Questions Matls of Construction

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CHEMICAL ENGINEERING OBJECTIVE TYPE

QUESTIONS: A COMPILATION

DR. LEONARDO C. MEDINA, JR.

DEAN, COLLEGE OF ENGINEERING

LYCEUM OF THE PHILIPPINES UNIVERSITY

MATERIALS OF CONSTRUCTION


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1. Bog iron is used for adsorption of H2S from coke oven gas isa. an intimate mixture of saw dust and iron dust (i.e. moist ferric

hydroxide)

b. iron impregnated with resin (usually bakelite)

c. carbon free irond. none of these

2. Iron alloyed with carbon up to 2% is calleda. pig iron b. wrought iron

c. high carbon steel d. none of these

3. The softest material in Mhos scale (for measuring hardness) isa. talc b. gypsum

c. rubber d. none of these

4. Karbate isa. a mixture of iron dust and saw dust

b. carbon impregnated with resin (usually bakelite)

c. acid resistant material

d. both (b) and (c).

5. Duralumin is an alloy ofa. aluminum, copper and manganese

b .aluminum, nickel and silicon

c. aluminum and nickel

d. none of these

6. Corrosion resistance of steel is increased by the addition ofa. phosphorus and tungsten

b. nickel and chromium

c. lead and vanadium

d. molybdenum and tungsten

7. White metal is an alloy ofa. lead, tin and cadmium b. copper, tin and zinc

c. copper and lead d. none of these

8. Presence of cobalt in steel improve itsa. cutting ability b. corrosion resistance

c. tensile strength d. none of these


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9. The impure iron (Pig iron) that is taped out from blast furnace contains abouta. 0.2% carbon b. 2% carbon

c. 4% carbon d. 8% carbon

10.Carbon content in steel isa. 0.12% b. 46%

c. 5- 10% d. 0

11.An ideal material of construction for the storage of 50% caustic soda solution wouldbe

a. Karbate b. high silica cast iron

c. monel d. none of these

12.For storing water and acid free benzol, usea. steel vessel b. karbate vessel

c. stainless steel vessel d. none of these

13.Brine (15% concentration) can be stored in a vessel made ofa. monel b. karbate

c. cast iron d. none of these

14.Most suitable material of construction for the storage of concentrated nitric acid isa. cast iron

b. monel

c. karbate

d. aluminum or chromium alloys (Cr > 18% for cold acid).

15.Babbit metal (used for making bearings) comprisesa. mainly tin (85%) and lead

b. saw dust and iron dust mixture

c. zinc and aluminum

d. copper and aluminum

16.The material of construction of pressure mills used for squeezing out the juice fromsugar cane is

a. stainless steel b. cast iron

c. mild steel d. monel.


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17.Chlorination of benzene is done to produce benzene hexachloride (a pesticide) in aphotochemical reactor lined with

a. karbate b. lead or glass

c. fire clay bricks d. PVC

18.Polymerization reactor used for the production of styrenebutadiene rubber (SBR) ismade of

a. vessel b. stainless steel or glass lined vessel

c. karbate d. wrought iron

19.Which of the following is the most suitable material of construction for evaporatorand its tubes for concentrating NaOH solution to 70%?

a. cast iron b. steel

c. nickel d. karbate

20.Most common stainless steel type 316, which it highly resistant to corrosion containsa. 1613% chromium, 1014% nickel and 23% molybdenum

b. 2022% chromium, and 810% nickel

c. 24% chromium, 22% nickel and 24% molybdenum

d. none of these

21.Caustic soda can be stored ina. steel drums b. cast iron drums

c. brass drums d. gun metal drums

22.Brass is an alloy ofa. nickel and tin b. copper and zinc

c. tin and lead d. copper, nickel and zinc

23.The carbonating tower used in Solvay Process of soda ash manufacture is made ofa. cast iron b. stainless steel

c. karbate d. lead lined steel

24.Gun metal is an alloy ofa. nickel, tin and copper

b. copper, tin and zinc

c. copper, phosphorus and nickel

d. manganese, phosphorus and nickel


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25.Marcy ball mills are usually made ofa. steel b. cast iron

c. stainless steel d. bronze

26.Bronze is an alloy ofa. lead and copper b. copper and tin

c. nickel and copper d. copper and zinc

27.Rotary kilns in cement industry are lined witha. fire clay b. silica

c. lead d. high alumina and high magnesia bricks

28.In the Kraft (sulfate) process for the paper manufacture the digester is made ofa. cast iron b. stainless steel

c. karbate carbon d. wrought iron

29.Dry chlorine can be handled in a vessel made ofa. iron or steel b. PVC

c. nickel d. brass

30.Tank furnace used for melting of glass is made ofa. mild steel b. cast iron

c. refractory blocks d. stainless steel

31.Stainless steel containsa. chromium and nickel b. copper

c. aluminum d. vanadium

32.Caustic soda is reduced in a mercury cell having anode and cathode maderespectively of

a. moving mercury and graphite

b. graphite and moving mercury

c. moving mercury and carbon

d. moving mercury and crimped steel wire

33.Monel metal is an alloy ofa. molybdenum and nickel

b. nickel and copper

c. molybdenum and aluminum

d. molybdenum and zinc


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34.German silver is an alloy ofa. copper, nickel and zinc

b. copper, aluminum and silver

c. silver, zinc and aluminum

d. silver, nickel and zinc

35.Chromel (Nichrome) is an alloy ofa. chromium and molybdenum

b. nickel and chromium

c. molybdenum and nickel

d. chromium and aluminum

36.Urea autoclave is made ofa. cast iron b. refractory blocks

c. stainless steel d. lead lined steel

37.Steel tower used for storage of oleuma. is lined with lead b. need not be lined

c. is lined with rubber d. is lined with acid-proof bricks

38.Hydrochloric acid is stored ina. lead lined steel vessel b. rubber-lined steel vessel

c. stainless steel vessel d. cast iron vessel

39.Photographic plates are coated ina. silver nitrate b. silver halide

c. calcium silicate d. metallic silver

40.Aqueous nitric acid is stored ina. steel drum

b. stainless steel vessel

c. cast iron vessel lined with acid-proof masonry brick

d. cast iron vessel41.SO3is absorbed using H2SO4in

a. cast iron packed tower

b. stainless steel plate tower

c. packed steel tower lined with acid proof bricks

d. none of these


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42.Hydrochloric acid absorber is made ofa. cast iron b. mild steel

c. karbate d. stainless steel

43.Sulfuric acid is mixed with ground phosphate rock (to produce phosphoric acid) in asteel digester lined with

a. acidic refractory b. rubber

c. karbate d. lead or acid-proof bricks

44.Fill up the blanks from among the following alternatives:Hydrochloric acid is _______ corrosive to common metals

a. least b. not

c. mildly d. highly

45.In SO3absorber (Contact Process), packing material used is ofa. cast iron b. chemical stoneware

c. karbate d. mild steel

46.Valves in pipe sizes of 2 and under are normally made ofa. wrought iron b. brass

c. bronze d. monel

47.Acid proof stonewarea. has very low strength

b. cannot be heated

c. is broken by small temperature changes

d. all (a), (b) and (c)

48.Duriron isa. acid resistant, brittle and very hard

b. high silicon iron

c. prone to breakage due to thermal expansion because of very high co-efficient of

thermal expansion.



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49.Lead pipe isa. 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 straind. all (a), (b) and (c)

50.The most resistant material to alkaline corrosion isa. duriron b. nickel

c. aluminum d. karbate

51.Presence of nickel in steel improves itsa. corrosion resistance b. cutting ability

c. wear resistance d. all (a), (b) and (c)

52.An alloy of iron containing 4% carbon is calleda. high carbon steel b. wrought iron

c. mild steel d. none of these

53.Bell metal is an alloy ofa. copper and zinc b. copper and tin

c. copper and nickel d. zinc and tin

54.Inconel is an alloy ofa. tin, zinc and nickel b. iron, nickel and chromium

c. copper and nickel d. zinc and tin

55.Hastelloy comprisesa. copper and tin b. copper and nickel

c. molybdenum and nickel d. lead and tin

56.Ability of a material to absorb energy in deformation in the plastic range ischaracterized as its

a. ductility b. toughness

c. creep d. resilience


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57.Slow and progressive deformation of a material with time under constant stress iscalled

a. creep b. erosion

c. resilience d. none of these

58.Wrought iron isa. high carbon iron

b. highly resistance to acid corrosion

c .malleable and ductile; hence used for chain links, hooks and couplings

d. an alloy of iron, chromium and carbon

59.Which of the following constituents of cast iron is mainly responsible for imparting itan anti-corrosive property?

a. silicon b. phosphorus

c. sulfur d. none of these

60.Mild steel isa. a low carbon steel (0.050.3% carbon)

b. highly resistance to corrosion (as much as stainless steel)

c. a high carbon steel (0.51.5% carbon)

d. very poor in strength and ductility

61.Presence of manganese in alloy steel improves itsa. corrosion resistance

b. cutting ability

c. abrasion resistance and toughness

d. elasticity and creep resistance

62.H2SO4(


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64.Brass container is suitable for storinga. aqueous ammonia b. beer

c. H2SO4(95% concentration) d. phosphoric acid (95%)

65.Cast iron vessels are not suitable for the storage ofa. Freon b. H2SO4(95%) at room temperature

c. H2SO4(fuming) d. Wet SO2

66.Out of the following, copper vessels are most suitable for the storage ofa. bromine

b. dry chlorine and dry fluorine

c. nitric acid (95% and fuming)

d. phosphoric acid (95%) and sulfuric acid (95% and fuming)

67.Gun metal and bronze are not corroded by the action ofa. wet chlorine b. synthetic detergent solution

c. hydrochloric acid (10%) d. nitric acid (


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72.Platinum and silver are corroded bya. caustic soda solution b. phosphoric acid

c. sulfuric acid (10%) d. none of these

73.18-8 stainless steel means that it containsa. 18% chromium and 8% nickel

b. 18% chromium and 8% molybdenum

c. 18% nickel and 8% chromium

d. 18% molybdenum and 8% chromium

74.Stainless steel is not corroded bya. hydrochloric acid (10%) b. nitric acid (10%)

c. sulfuric acid (10%) d. saturated brine

75.Tin vessels are corroded bya. anhydrous ammonia b. aromatic solvents

c. synthetic detergent solution d. none of these

76.Rubber lined vessels are corroded by the action ofa. aqua regia b. chloroform

c. sulfuric acid (95%) d. all (a), (b) and (c)

77.Silicon rubber is not resistant to the corrosive action ofa. sulfuric acid (10%) b. sulfuric acid (95%)

c. ether d. both (b) and (c)

78.Perspex is nothing buta. acrylic sheet b. an elastomer

c. an alloy of lead and tin d. aluminum foil clad with Bakelite

79.Teflon is corroded bya. hydrochloric acid (10%) b. hydrochloric acid (95%)

c. sulfuric acid d. none of these

80.Polythene (low or high density) containers are not corroded bya. sulfuric acid (10%) at room temperature

b. nitric acid (95%) at room temperature

c. sulfur trioxide at 60C

d. any of these


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81.The most commonly used resin for making reinforced plastic isa. unsaturated polyester b. polyproplylene

c. polyurethane d. nylon6

82.Carbon tetrachloride can be stored in a storage vessel made ofa. high silicon iron (14%) b. tin

c. stainless steel d. all (a), (b) and (c)

83.Concrete tank can be used to storea. alum b. sulfuric acid

c. sulfuric acid d. saturated brine

84.Glass is corroded bya. fluorine (dry or wet) b. sulfuric water

c. phosphoric acid d. none these

85. Graphite is corroded by

a. sulfuric acid (10%) b. sea Water

b. hydrochloric acid d. none of these

86. Wood is corroded by

a. hydrochloric acid b. SO2 (dry or wet)

c. chlorine (dry or wet) d. all (a), (b) and (c)

87. The 'bomb' in the bomb calorimeter is made of

a. molybdenum stainless steel b. mild steel

c. high silicon iron (14% Si) d. copper

88. Most suitable material for high pressure vessel operating at 500 atm and 500C is

a. molybdenum stainless steel b. 18-8 stainless steel

c. mild steel d. high silicon iron (14% Si)

89. Centrifugal pump made of pyrex or glass can't be used to pump

a. mild and fruit juices b. alkaline solutions

c. dilute H2SO4 at room temperature d. brine

90. Rubber lined pumps can be used to pump

a. caustic soda b. chlorinated brine

c. hypochlorous acid d. all (a), (b) and (c)


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91. Copper is dissolved from its ore by H2SO4 in percolation tanks made of

a. wood b. stainless steel

c. reinforced concrete lined with lead d. high silicon iron (14% Si)

92. Rotary dryers are generally made ofa. cast iron b. mild steel

c. high silicon iron (14% Si) d. tin lined with refractory bricks

93. Kel-F is

a. nothing but polycholorotrifluroethylene

b. having excellent chemical and high temperature resistance (up to 200C)

c. an elastomer


94. Zircaloy used as a fuel cladding material in a nuclear reactor (thermal) is an alloy

of zirconium

a. tin, nickel, iron and chromium b. and graphite

c. and copper d. none of these

95. Which of the following would not be a suitable material of construction for handling

aqueous hydrofluoric acid (HF) at 100C?

a. none b. stainless steel

c. graphite d. Kel-F and Teflon

96. Specify the materials of construction suitable for handling concentrated HNO3 at

100C.

a. high silicon iron, Kel-F and Teflon b. silicon rubber

c. tin and wood d. stainless steel

97. Concentrated HCl at 30C can be stored in a vessel made of

a. PTFE and porcelain

b. cast iron and aluminum

c. stainless steel and high silicon cast iron

d. copper, nickel and monel


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98. Which of the following material of construction may be recommended by a chemical

engineer for handling a gaseous chlorine (dry or wet) stream in a fluid flow system?

a. High silicon iron, silicone rubber, Kel-F and teflon

b. Mild steel and stainless steel

c. Cast iron, tin and aluminumd. Copper, nickel and monel

99. Which of the following materials may prove unsuitable for handling acetic (glacial

and anhydrous) at 40C?

a. silicone rubber, teflon, porcelain and wood

b. nickel, monel, stainless steel and graphite

c. aluminum, copper, high silicon iron

d. brass, cast iron, mild steel and tin

100. 100% H2SO4 at 30C can't be used and stored in a vessel made/ lined with

a. cast iron and high silicon iron b. mild steel and stainless steel

c. aluminum, tin and rubber d. teflon, glass and porcelain

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Chemical Engineering Objective Type Questions Matls of Construction