chemical engineering MCQs – Page 143

Practise multiple-choice questions from chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs

7101. Chlorination of benzene is done to produce benzene hexachloride (a pesticide) in a photochemical reactor lined with_____________________?
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A. Fireclay bricks

B. Karbate

C. PVC

D. Lead or glass

7102. Spray dryer for evaporating milk to produce milk powder is made of_________________?
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A. Cast iron

B. Aluminium

C. Lead lined steel

D. Stainless steel

7103. Presence of even 0.005% of _____________ in copper makes it highly brittle, rendering it useless for wire-drawing?
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A. Bismuth

B. Arsenic

C. Antimony

D. Oxygen

7104. In the Kraft (sulphate) process for the paper manufacture, the digestor is made of________________?
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A. Cast iron

B. Stainless steel

C. Karbate carbon

D. Wrought iron

7105. Valves in pipe size of 2? and under are normally made of_______________________?
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A. Bronze

B. Wrought iron

C. Monel

D. Brass

7106. With increase in carbide/graphite ratio in cast iron, its__________________?
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A. Hardness & brittleness increases

B. Ductility decreases

C. Both A. and B.

D. Neither A. nor B.

7107. Brinell Hardness Number (BHN) for talc is approximately in the range of____________________?
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A. 200 250

B. 100 -150

C. 5-Jan

D. 20-30

7108. The material used in the filament of electric bulbs is_________________?
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A. German silver

B. Tungsten

C. Nichrome

D. Constantan

7109. _______________ does not contain tin as an alloying material?
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A. Pewter

B. Brass

C. Solder

D. Babbitt metal

7110. Caustic soda can be stored in _____________ drums?
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A. Steel

B. Brass

C. Cast iron

D. Gun metal

7111. Teflon (PTFE) is corroded by_______________?
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A. Hydrochloric acid (95%)

B. Sulphuric acid

C. None of these

D. Hydrochloric acid (10%)

7112. Presence of 0.3 to 0.5% arsenic in copper increases its____________________?
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A. Ductility

B. Tenacity & hardness

C. Malleability

D. Electrical conductivity

7113. Which of the following is not used as the ceramic material in cermets??
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A. Nitrides

B. Carbides

C. Oxides

D. Silicides

7114. Which of the following is the lightest of engineering metals ?
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A. Aluminium

B. Titanium

C. Magnesium

D. Tin

7115. An alloy used as thermocouple material comprises of 40% nickel and 60% copper. It is called____________________?
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A. Kanthal

B. Constantan

C. German silver

D. Chromel

7116. To improve the machinability of steel, it is generally subjected to_______________?
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A. Tempering

B. Annealing

C. Normalising

D. Spheroidising

7117. Acetaldehyde is shipped in ____________ drums?
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A. Aluminium

B. Cast iron

C. Either B. & C.

D. Steel

7118. Which of the following is a non-magnetic material ?
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A. Cobalt

B. Zinc

C. None of these

D. Nickel

7119. Chromel (Nichrome) is an alloy of_____________________?
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A. Chromium and molybdenum

B. Molybdenum and nickel

C. Nickel and chromium

D. Chromium and aluminium

7120. Hardest material so far found is__________________?
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A. Pumice stone

B. Diamond

C. Graphite

D. Carborundum

7121. Out of the following, copper vessels are the most suitable for the storage of__________________?
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A. Phosphoric acid (95%) & sulphuric acid (95% and fuming)

B. Dry chlorine & dry fluorine

C. Bromine

D. Nitric acid (95% and fuming)

7122. Copper is dissolved from its ore by H2SO4 in a percolation tank made of_________________?
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A. Wood

B. High silicon iron (14% Si)

C. Reinforced concrete lined with lead

D. Stainless steel

7123. Acetaldehyde is produced by hydration of acetylene in a sulphuric acid solution of mercuric sulphate. Hydration tower is made of___________________?
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A. Rubber lined mild steel

B. Cast iron

C. Aluminium

D. Lead lined mild steel

7124. Glass lined vessels are not used for handling/storing__________________?
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A. Dilute HCl

B. Dilute H2SO4

C. Hydrofluoric acid

D. Dilute HNO3

7125. Galvanised iron is___________________?
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A. None of these

B. Harder

C. Protected from rusting

D. Alumina coated iron

7126. Maximum consumption of copper is in__________________?
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A. Small scale industries

B. Industrial equipment manufacture

C. Electrical industry

D. Utensil manufacture

7127. The heat treatment process applied to cold formed steel parts is ____________________?
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A. Artificial ageing

B. Tempering

C. Normalising

D. Solution annealing

7128. A material is called ductile, if it can be__________________?
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A. Made lustrous by heating it

B. Drawn into wires

C. Hammered to a thin sheet

D. Fractured without deformation

7129. White metal is an alloy of___________________?
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A. Lead, tin and cadmium

B. Copper and lead

C. Copper, tin and zinc

D. None of these

7130. Addition of ______________ in steel is helpful in increasing the depth of hardness?
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A. Tungsten

B. Chromium

C. Sulphur

D. Vanadium

7131. Acetylene gas holder is made of__________________?
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A. Cast iron

B. Steel

C. Monel metal

D. Copper

7132. Addition of ______________ to the steel helps in increasing the residual magnetism in steel used for making magnets?
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A. Tungsten

B. Cobalt

C. Chromium

D. Nickel

7133. Percentage of silver in German silver is__________________?
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A. 0

B. 5

C. 20

D. 10

7134. Rotary driers are generally made of_______________?
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A. Cast iron

B. Tin lined with refractory bricks

C. Mild steel

D. High silicon iron (14% Si)

7135. In the Kraft process of sulphate paper pulp manufacture, the black liquor and the white liquor storage tank is made of _______________?
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A. Porcelain

B. Steel

C. Wood

D. Concrete

7136. The ability of a material to offer resistance to scratching or indentation is a measure of its_________________?
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A. Toughness

B. Hardness

C. Resilience

D. Brittleness

7137. The phenomenon in which slow extension of material takes place with the time at constant load is called________________?
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A. Creep

B. Ductility

C. Elasticity

D. Plasticity

7138. Addition of 2% nickel in steel makes it suitable for making ___________________?
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A. Connecting rod

B. Electronic valves

C. Boiler plates, rivets etc.

D. Turbine blades

7139. Mild steel is ___________________?
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A. A low carbon steel (0.05 to 0.3% carbon)

B. A high carbon steel (0.5 to 1.5% carbon)

C. Highly resistant to corrosion (as much as stainless steel)

D. Very poor in strength & ductility

7140. Cast iron is a ______________ material?
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A. Tough

B. Brittle

C. Ductile

D. Malleable

7141. Hydrochloric acid absorber in made of___________________?
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A. Cast iron

B. Stainless steel

C. Karbate

D. Mild steel

7142. Graphite is a good________________?
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A. Thermal & electrical insulator

B. Conductor of heat

C. Conductor of electricity

D. Both B. & C.

7143. Aqueous nitric acid is stored in________________?
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A. Cast iron vessel

B. Stainless steel vessel

C. Steel drum

D. Cast iron vessel lined with acid-proof masonry brick

7144. For handling sulphuric acid of 95% strength, the suitable material of construction for pipes is__________________?
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A. Cast iron

B. Stainless steel

C. Nickel

D. Aluminium

7145. Babbitt metal used for bearings is a ____________base alloy?
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A. Copper

B. Aluminium

C. Tin

D. Lead

7146. Balls in a ball mill are usually made of__________________?
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A. Steel

B. Bronze

C. Stainless steel

D. Cast iron

7147. The metals occuring at the lower most position in the electromotive series____________________?
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A. Do not resist corrosion

B. Resist corrosion very strongly

C. Are heat insulators

D. Are very brittle

7148. Corrosion involves exchange of electrons in ____________ corrosion?
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A. Chemical

B. Electrochemical

C. Both A. & B.

D. Neither A. nor B.

7149. Reactor used in the production of polyvinyl chloride (PVC) is made of____________________?
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A. Tantalum

B. Aluminium

C. Lead

D. Nickel or glass lined steel

7150. Presence of manganese in alloy steel improves its___________________?
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A. Corrosion resistance

B. Abrasion resistance & toughness

C. Cutting ability

D. Elasticity & creep resistance

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