chemical engineering MCQs – Page 6

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 Review each marked answer and report any item that may be outdated or unclear.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
101. Co-efficient of performance of a Carnot cycle refrigerator operating between 23C and + 27C is ________________?
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A. 0.5

B. 3

C. 1.5

D. 5
102. ________________ is a special constituent of chlorophyll without which photosynthesis is not possible ?
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A. Nitrogen

B. Calcium

C. Phosphorous

D. Hydrogen

103. Boiler tube size is specified by its thickness and _____________________ diameter ?
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A. Outside

B. Inside

C. None of these

D. Mean

104. The escape velocity of a body on earth which is independent of its mass is about ______________________ km/second?
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A. 11

B. 3

C. 15

D. 7

105. Percentage of differential pressure lost in a Venturimeter with a tapering of 15 may be about___________________?
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A. 25

B. 10

C. 50

D. 1

106. Air-petrol ratio for maximum power generation in spark ignition engine is about_____________________?
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A. 12 : 1

B. 24:01:00

C. 6:01

D. 18:01

107. Temper brittleness of a material can be fairly detected by the ________________ test ?
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A. Fatigue

B. Tensile

C. Notched bar impact

D. Hardness

108. With increase in temperature, the electrical conductivity of semiconductors_____________________?
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A. Increases

B. Decreases

C. Remain constant

D. Either A. or B. depends on the type of semi-conductor

109. Materials having ________________ lattice structure are usually the most ductile ?
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A. Body centred cubic (bcc)

B. Face centred cubic (fcc)

C. None of these

D. Hexagonal close packed (hcp)

110. The refractory lining of the bottom in a basic electric arc furnace is made of___________________?
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A. Silica

B. Alumina

C. Magnesia

D. Fireclay

111. Catalyst used in the catalytic converter employed in automobile exhaust line for complete combustion/oxidation of carbon monoxide, nitrogen oxides and hydrocarbons is__________________?
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A. Alumina

B. Platinum

C. Vanadium pentoxide

D. Iron oxide

112. Lap joints are preferred over butt joints in soldering/brazing, because these joints are _________________?
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A. Weaker in tension but stronger in shear

B. Weaker in shear but stronger in tension

C. Stronger in both shear and tension

D. The lap joints are easily made
113. Annealing of cast iron__________________?
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A. None of these

B. Decreases the free carbon

C. Softens it to facilitate machining

D. Increases the strength

114. The pressure outside a bubble/droplet of liquid is ________________ the internal pressure?
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A. Greater than

B. Equal to

C. Less than

D. Unpredictable; depends on the bubble size

115. Water flow in the river during flood can be categorized as the _________________ flow ?
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A. Steady uniform

B. Steady non-uniform

C. Unsteady non-uniform

D. Unsteady uniform

116. The wet bulb temperature is lower in dry air than in wet air at the same temperature. A dry bulb thermometer registers a higher temperature than a wet bulb thermometer except at ______________ percent relative humidity ?
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A. None of these

B. 0

C. 100

D. 50

117. A steam carrying pipeline is insulated with two layers of insulating materials with the inferior insulation material forming the inner part. If the two insulating layers are interchanged, the heat conducted will____________________?
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A. Decrease

B. May increase or decrease; depends on the thickness of each layer

C. Increase

D. Remain unaffected
118. Which of the following is the most suitable material of construction for the condenser tubes, where the cooling medium is brine (salty water) ?
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A. Copper

B. Titanium

C. Aluminium

D. Stainless steel

119. Consider the equilibrium A(g) + B(g) = AB(g). When the partial pressure of A is 10-2 atm, the partial pressure of B is 10-3 atm and the partial pressure of AB is 1 atm, the equilibrium constant K is____________________?
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A. 10 atm-1

B. 10 (dimensionless)

C. 105 (dimensionless)

D. 105 atm-1
120. Sub zero treatment of steel is done to____________________?
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A. Enhance its working performance in sub zero atmosphere

B. Induce temper brittleness after its hardening

C. Suppress martensite transformation

D. Reduce the retained austenite in hardened steel