chemical engineering MCQs – Page 8

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 Review each marked answer and report any item that may be outdated or unclear.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

141. Window panes of aeroplanes are normally made of_____________________?
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A. Perspex (PMMA)

B. Bakelite (phenol formaldehyde)

C. Polystyrene

D. Teflon (PTFE)

142. Limestone is added in the blast furnace (during pig iron manufacture) to______________________?
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A. Form slag by combining with impurities

B. Supply heat by undergoing exothermic reaction with impurities

C. Reduce the coke consumption

D. Reduce slag viscosity

143. Super heating of steam is done at constant___________________?
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A. Enthalpy

B. Volume

C. Pressure

D. Entropy

144. Silicon crystal can be converted to p-type semi-conductor by doping with__________________?
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A. Boron

B. Nitrogen

C. Carbon

D. Phosphorous

145. Alumina, silica, lime and iron oxide are the basic raw material for the manufacture of Portland cement. The component of Portland cement which first hardens is_____________________?
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A. 5CaO. 3 Al2O3

B. 2CaO. SiO2

C. 3CaO. Al2O3

D. 3CaO. SiO2

146. Oxide layer formed on the non-ferrous metal surface after its annealing is__________________?
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A. Hammered into the surface

B. Removed by acid pickling

C. Left as such to protect the surface

D. Removed with coarse emery cloth

147. The ratio of mass of a neutron to that of an electron is about 1839. What is the ratio of the mass of a proton to that of an electron ?
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A. 1837

B. 10000

C. 159

D. 2537

148. The rolling process cannot be used to produce______________________?
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A. Plates

B. Rods

C. Wires

D. Tubes

149. Laser is a device to produce___________________?
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A. Microwaves

B. A beam of white light

C. A beam of coherent light

D. Gamma rays

150. The capacity of a spring to store energy is called the spring form co-efficient. Stiffness of a spring is measured by the____________________?
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A. Capacity to store energy

B. Load to produce unit deflection

C. Ability to absorb shock

D. Ratio of the wire & coil diameters

151. The leaching solvent used in Baeyers process for the purification of bauxite is___________________?
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A. Sodium carbonate

B. Ammonium hydroxide

C. Ammonium carbonate

D. Sodium hydroxide

152. Which of the following is not used as a bearing material ?
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A. Bronzes

B. Copper-lead alloys

C. Cermets

D. Babbitts

153. Chlorine acts as a bleaching agent only in the presence of ______________________?
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A. Dry air

B. Moisture

C. Pure oxygen

D. Sunlight

154. The material used for coating the welding electrode is termed as the___________________?
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A. Binder

B. Protective layer

C. Slag

D. Flux

155. Hydrogen in liquid steels is dissolved_________________?
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A. In the atomic form

B. In the ionic form

C. As tiny gas bubbles

D. In the molecular form

156. The thickness of oxide film is y at time t. If K1, K2 and K3 are the temperature dependent constants, the parabolic law of oxidation is given by __________________?
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A. y = k1 t + k2

B. y = k1 ln (k2t + k3)

C. y2 = 2k1t + k2

D. y = k1t3 + k2

157. Carbon is present in the form of _______________________ in grey cast iron ?
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A. Cementite

B. Flakes

C. Spheroids

D. Nodular aggregates of graphite

158. Brass parts with high residual tensile stress at the surface are susceptible to season cracking (i.e. spontaneous cracking occuring on exposure to atmospheric corrosion), if its zinc percentage is more than ?
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A. 5

B. 35

C. 20

D. 10

159. Presence of nickel & chromium in steel does not raise its _________________?
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A. Machining properties

B. Elastic limit

C. Ductility

D. Resilience

160. Fatigue limit improvement by over stressing the metal by successively increasing the load is called coaxing. In fatigue failure, the material fails ?
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A. Below the yield point

B. Above the yield point

C. At the elastic limit

D. Below the elastic limit

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