CHEMICAL ENGINEERING OBJECTIVE TYPE QUESTIONS: A COMPILATION 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 H 2S from coke oven gas is a. an intimate mixture of saw dust and iron dust (i.e. moist ferric hydroxide) b. iron impregnated with resin (usually bakelite) c. carbon free iron d. none of these 2. Iron alloyed with carbon up to 2% is called a. pig iron b. wrought iron c. high carbon steel d. none of these 3. The softest material in Mho’s scale (for measuring hardness) is a. talc b. gypsum c. rubber d. none of these 4. Karbate is a. 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 of a. 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 of a. phosphorus and tungsten c. lead and vanadium b. nickel and chromium d. molybdenum and tungsten 7. White metal is an alloy of a. lead, tin and cadmium c. copper and lead
b. copper, tin and zinc d. none of these
8. Presence of cobalt in steel improve its a. cutting ability b. corrosion resistance c. tensile strength d. none of these Page 2
9. The impure iron (Pig iron) that is taped out from blast furnace contains about a. 0.2% carbon b. 2% carbon c. 4% carbon d. 8% carbon 10. Carbon content in steel is a. 0.1 – 2% b. 4 – 6% c. 5- 10% d. 0 11. An ideal material of construction for the storage of 50% caustic soda solution would be a. Karbate b. high silica cast iron c. monel d. none of these 12. For storing water and acid free benzol, use a. steel vessel b. karbate vessel c. stainless steel vessel d. none of these 13. Brine (15% concentration) can be stored in a vessel made of a. monel b. karbate c. cast iron d. none of these 14. Most suitable material of construction for the storage of concentrated nitric acid is a. cast iron b. monel c. karbate d. aluminum or chromium alloys (Cr > 18% for cold acid). 15. Babbit metal (used for making bearings) comprises a. 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 from sugar 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 a photochemical 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) is made 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 evaporator and 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 contains a. 16 – 13% chromium, 10 –14% nickel and 2 – 3% molybdenum b. 20 – 22% chromium, and 8 –10% nickel c. 2 – 4% chromium, 22% nickel and 2 – 4% molybdenum d. none of these 21. Caustic soda can be stored in a. steel drums b. cast iron drums c. brass drums d. gun metal drums 22. Brass is an alloy of a. nickel and tin c. tin and lead
b. copper and zinc d. copper, nickel and zinc
23. The carbonating tower used in Solvay Process of soda ash manufacture is made of a. cast iron b. stainless steel c. karbate d. lead lined steel 24. Gun metal is an alloy of a. nickel, tin and copper b. copper, tin and zinc c. copper, phosphorus and nickel d. manganese, phosphorus and nickel Page 4
25. Marcy ball mills are usually made of a. steel b. cast iron c. stainless steel d. bronze 26. Bronze is an alloy of a. lead and copper c. nickel and copper
b. copper and tin d. copper and zinc
27. Rotary kilns in cement industry are lined with a. 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 of a. cast iron b. stainless steel c. karbate carbon d. wrought iron 29. Dry chlorine can be handled in a vessel made of a. iron or steel b. PVC c. nickel d. brass 30. Tank furnace used for melting of glass is made of a. mild steel b. cast iron c. refractory blocks d. stainless steel 31. Stainless steel contains a. chromium and nickel c. aluminum
b. copper d. vanadium
32. Caustic soda is reduced in a mercury cell having anode and cathode made respectively of a. moving mercury and graphite c. moving mercury and carbon b. graphite and moving mercury d. moving mercury and crimped steel wire 33. Monel metal is an alloy of a. 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 of a. copper, nickel and zinc b. copper, aluminum and silver 35. Chromel (Nichrome) is an alloy of a. chromium and molybdenum b. nickel and chromium 36. Urea autoclave is made of a. cast iron c. stainless steel
c. silver, zinc and aluminum d. silver, nickel and zinc
c. molybdenum and nickel d. chromium and aluminum
b. refractory blocks d. lead lined steel
37. Steel tower used for storage of oleum a. 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 in a. lead lined steel vessel b. rubber-lined steel vessel c. stainless steel vessel d. cast iron vessel 39. Photographic plates are coated in a. silver nitrate c. calcium silicate
b. silver halide d. metallic silver
40. Aqueous nitric acid is stored in a. steel drum b. stainless steel vessel c. cast iron vessel lined with acid-proof masonry brick d. cast iron vessel 41. SO3 is absorbed using H 2SO4 in 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 of a. cast iron b. mild steel c. karbate d. stainless steel 43. Sulfuric acid is mixed with ground phosphate rock (to produce phosphoric acid) in a steel 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 SO3 absorber (Contact Process), packing material used is of a. cast iron b. chemical stoneware c. karbate d. mild steel 46. Valves in pipe sizes of 2” and under are normally made of a. wrought iron b. brass c. bronze d. monel 47. Acid proof stoneware a. has very low strength b. cannot be heated c. is broken by small temperature changes d. all (a), (b) and (c) 48. Duriron is a. 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. d. all (a), (b) and (c)
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49. 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) 50. The most resistant material to alkaline corrosion is a. duriron b. nickel c. aluminum d. karbate 51. Presence of nickel in steel improves its a. corrosion resistance b. cutting ability c. wear resistance d. all (a), (b) and (c) 52. An alloy of iron containing 4% carbon is called a. high carbon steel b. wrought iron c. mild steel d. none of these 53. Bell metal is an alloy of a. copper and zinc c. copper and nickel
b. copper and tin d. zinc and tin
54. Inconel is an alloy of a. tin, zinc and nickel c. copper and nickel
b. iron, nickel and chromium d. zinc and tin
55. Hastelloy comprises a. copper and tin c. molybdenum and nickel
b. copper and nickel d. lead and tin
56. Ability of a material to absorb energy in deformation in the plastic range is characterized 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 is called a. creep b. erosion c. resilience d. none of these 58. Wrought iron is a. 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 it an anti-corrosive property? a. silicon b. phosphorus c. sulfur d. none of these 60. Mild steel is a. a low carbon steel (0.05 – 0.3% carbon) b. highly resistance to corrosion (as much as stainless steel) c. a high carbon steel (0.5 – 1.5% carbon) d. very poor in strength and ductility 61. Presence of manganese in alloy steel improves its a. corrosion resistance b. cutting ability c. abrasion resistance and toughness d. elasticity and creep resistance 62. H2SO4 (<50% concentration) is corrosive to a. aluminum, mild steel, stainless steel, concrete and tin b. copper, cast iron and high silicon iron (14% Si) c. rubber (butyl and hard) silicon rubber and teflon d. glass, graphite, porcelain and stoneware 63. Aluminum storage vessel can be used to store a. aqua regia b. ferrous sulfate c. hydrochloric acid (10%) d. none of these
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64. Brass container is suitable for storing a. aqueous ammonia b. beer c. H2SO4 (95% concentration) d. phosphoric acid (95%) 65. Cast iron vessels are not suitable for the storage of a. Freon b. H 2SO4 (95%) at room temperature c. H2SO4 (fuming) d. Wet SO 2 66. Out of the following, copper vessels are most suitable for the storage of a. 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 of a. wet chlorine b. synthetic detergent solution c. hydrochloric acid (10%) d. nitric acid (<25%) 68. Containers made of high silicon cast iron (14% Si) are not suitable for the storage of a. acetic acid b. benzoic and boric acids c. phosphoric acid (95%) and sulfuric acid (95%) d. hydrochloric acid (concentrated) 69. Lead lined equipments and vessels are suitable for handling a. hydrochloric acid (10%) b. nitric acid d. all (a), (b) and (c) c. sulfuric acid up to 60˚C 70. Mild steel storage vessels are suitable for the storage of a. anhydrous ammonia b. fatty acids c. hydrochloric acid (95%) d. sulfuric acid (25%) 71. Nickel made clad equipments are suitable for handling a. ammonia (both aqueous and anhydrous) b. fruit juices, milk and its products and caustic soda solution c. nitric acid and hydrochloric acid (concentrated) d. sulfuric acid (concentrated)
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72. Platinum and silver are corroded by a. caustic soda solution b. phosphoric acid c. sulfuric acid (10%) d. none of these 73. 18-8 stainless steel means that it contains a. 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 by a. hydrochloric acid (10%) c. sulfuric acid (10%)
b. nitric acid (10%) d. saturated brine
75. Tin vessels are corroded by a. anhydrous ammonia c. synthetic detergent solution
b. aromatic solvents d. none of these
76. Rubber lined vessels are corroded by the action of a. aqua regia b. chloroform c. sulfuric acid (95%) d. all (a), (b) and (c) 77. Silicon rubber is not resistant to the corrosive action of a. sulfuric acid (10%) b. sulfuric acid (95%) c. ether d. both (b) and (c) 78. Perspex is nothing but a. acrylic sheet c. an alloy of lead and tin 79. Teflon is corroded by a. hydrochloric acid (10%) c. sulfuric acid
b. an elastomer d. aluminum foil clad with Bakelite
b. hydrochloric acid (95%) d. none of these
80. Polythene (low or high density) containers are not corroded by a. sulfuric acid (10%) at room temperature b. nitric acid (95%) at room temperature
c. sulfur trioxide at 60˚C d. any of these Page 11
81. The most commonly used resin for making reinforced plastic is a. unsaturated polyester b. polyproplylene c. polyurethane d. nylon – 6 82. Carbon tetrachloride can be stored in a storage vessel made of a. high silicon iron (14%) b. tin c. stainless steel d. all (a), (b) and (c) 83. Concrete tank can be used to store a. alum c. sulfuric acid 84. Glass is corroded by a. fluorine (dry or wet) c. phosphoric acid
b. sulfuric water d. none these
85. Graphite is corroded by a. sulfuric acid (10%) b. hydrochloric acid
b. sea Water d. none of these
86. Wood is corroded by a. hydrochloric acid c. chlorine (dry or wet)
b. SO2 (dry or wet) d. all (a), (b) and (c)
b. sulfuric acid d. saturated brine
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 500ºC 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 H 2SO4 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) Page 12
91. Copper is dissolved from its ore by H 2SO4 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 of a. 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 200ºC) c. an elastomer d. all (a), (b) and (c) 94. Zircaloy used as a fuel cladding material in a nuclear reactor (thermal) is an of zirconium a. tin, nickel, iron and chromium b. and graphite c. and copper d. none of these
alloy
95. Which of the following would not be a suitable material of construction for handling aqueous hydrofluoric acid (HF) at 100ºC? a. none b. stainless steel c. graphite d. Kel-F and Teflon 96. Specify the materials of construction suitable for handling concentrated HNO 3 at 100ºC. a. high silicon iron, Kel-F and Teflon b. silicon rubber c. tin and wood d. stainless steel 97. Concentrated HCl at 30ºC 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 aluminum d. Copper, nickel and monel 99. Which of the following materials may prove unsuitable for handling acetic (glacial and anhydrous) at 40ºC? 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 30ºC 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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