chemical engineering MCQs – Page 7

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 Review each marked answer and report any item that may be outdated or unclear.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

121. Coating thickness in case of galvanising of steel sheet generally corresponds to the deposition of _______________ gms of zinc per m2 of steel strip ?
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A. 1000-1500

B. 10-May

C. 120-500

D. 1500-3000

122. Propulsion of rocket follows from the_________________?
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A. Newtons second law of motion

B. Archimedes principle

C. Newtons third law of motion

D. Law of projectiles

123. The _________________ of a double acting reciprocating pump as compared to the single acting pump will be almost double ?
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A. Overall efficiency

B. Flow output

C. Head developed

D. Weight

124. Thermistors are used in _____________ devices?
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A. Voltage measuring

B. Temperature measuring

C. Temperature compensating

D. Both B. & C.

125. Plastics as a material of construction suffer from the drawback of low_________________?
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A. Machinability

B. Strength

C. Plastic deformation

D. Density

126. Fire in fuel gas pipelines is extinguished most effectively by _________________?
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A. Blanketting the area with nitrogen atmosphere

B. Spraying water

C. None of these

D. Fire fighting foam

127. With increase in annealing temperature, the following defect density decreases?
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A. All of these

B. Vacancy

C. Grain boundary

D. Dislocation

128. Shampoos are commercially not available in the form of ___________________?
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A. Gaseous mixture

B. Powder

C. Emulsion

D. Solution

129. Which of the following test is used for distinguishing among dry oils, semi-drying oils and non drying oils ?
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A. Hunter value test

B. Elaiden test

C. Reichert-Meissl value test

D. Iodine value test

130. Lead is poured into the joint between two _______________ pipes ?
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A. Asbestos cement

B. Mild steel

C. Concrete

D. Cast iron

131. Basicity [%Cao + %MgO + %SiO2) of the slag in Indian blast furnace is in the range of___________________?
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A. 2.0 2.5

B. 1.5 1.8

C. 0.7-1.0

D. 1.1-1.4

132. Rain drops falling through atmospheric air attain limited terminal velocity, because of ____________________?
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A. Viscous force exerted by air

B. Surface tension effects of water

C. Upward thrust due to air

D. Force of gravity

133. Particle nature of cathode rays is proved due to the fact that they ________________?
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A. Produce fluorescence

B. Travel in a straight line

C. Heat the exposed material

D. Get deflected by magnetic electric field

134. Force between the molecules of the same substance is called ______________________ force?
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A. Cohesive

B. Molecular

C. Vander Walls

D. Adhesive

135. Spherical shape of mercury droplets is due to its____________________?
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A. High density

B. High viscosity

C. Low surface tension

D. High surface tension

136. Galvanic corrosion cannot be prevented by___________________?
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A. Anodic protection

B. Usage of largest possible anodic area

C. Cathodic protection

D. Any one of these

137. Addition of small amount of ________________ to grey cast iron is done to produce nodular grey cast iron ?
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A. Magnesium

B. Phosphorous

C. Manganese

D. Chromium

138. For infinite parallel planes having emissivities ?1 & ?2, the interchange factor for radiation from surface 1 to surface 2 is given by__________________?
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A. ?1.?2

B. ?1.?2/(?1 + ?2 ?1.?2)

C. ?1 + ?2

D. (?1 + ?2)/?1.?2

139. In multipass welds, shot peening is done after each pass to__________________?
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A. Introduce texture in the weld

B. Break the continuity of columnar grains

C. Close the surface porosity

D. Flatten the weldment

140. The value of y = cp/cv. at < 500C for air & most common gases can be safely assumed to be_____________________?
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A. 1.4

B. 1

C. 0.8

D. 1.8

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