chemical engineering stoichiometry MCQs – Page 7

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 Review each marked answer and report any item that may be outdated or unclear.

chemical engineering stoichiometry Mcqs
121. Which is a neutral refractory ?
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A. Graphite

B. Magnesia

C. Magnesite chrome

D. Silica

122. A vapor whose partial pressure is less than its equilibrium vapor pressure is called a ______________ vapor?
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A. Supersaturated

B. Saturated

C. None of these

D. Superheated
123. The value of the gas-law constant R is 1.987 ?
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A. kcal/kg-mole.C

B. Btu/lb-mole.R

C. kcal/kg-mole.K

D. Both B. & C.
124. Refractory bricks with lower permeability is produced by using _________________?
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A. Finer grog size

B. All A., B. and C.

C. Higher firing temperature

D. Higher moulding pressure

125. For a reaction, X ? Y, if the concentration of X is tripled; the rate becomes nine times. The order of reaction is__________________?
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A. 0

B. 3

C. 2

D. 1

126. The evaporation of aqueous solution of sugar causes its molarity to__________________?
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A. Remain unchanged

B. Decrease

C. Increase

D. Either A. or B.; depends on the concentration of the solution

127. Thermal diffusivity of a refractory brick is high, when its ______________ is high?
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A. Density

B. Thermal conductivity

C. None of these

D. Specific heat

128. 1 BTU/lb.?F is equivalent to ____________ kcal/kg.C?
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A. 1

B. 4.97

C. 2.42

D. 1.987

129. Pick out the wrong unit conversion of thermal conductivity ?
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A. 1 BTU/ft2.hr.F/inch = 1.488 kcal/m2. hr.C/m

B. 1 BTU/ft2.hr.F/ft = 1.488 kcal/m2. hr.C/m

C. 1 W/cm.C = 85.985 kcal/m.hr.C = 57.779 BTU/ft.hr.F

D. 1 kcal/m.hr.C = 0.672 BTU/ft.hr.F = 1.163 W/m. K

130. The number of atoms of oxygen present in 11.2 litres of ozone (O3) at N.T.P. are__________________?
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A. 6.02 1023

B. 9.03 1024

C. 1.20 1024

D. 3.01 1022

131. Which of the following expressions defines the Baume gravity scale for liquids lighter than water ?
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A. Be = 145 (145/G)

B. Be = (400/G) 400

C. Be = (140/G) 130

D. Be = 200(G-1)

132. The atomic heat capacities of all solid elements ______________ with decrease in temperature?
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A. Increases

B. Remains unchanged

C. Decreases

D. Approach zero at 0C

133. In case of a solution (not of a solid in a liquid), whose total volume is less than the sum of the volumes of its components in their pure states, solubility is__________________?
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A. Unchanged with pressure changes

B. Independent of temperature

C. Increases with rise in pressure

D. Increased with decrease in pressure

134. The weight fraction of methanol in an aqueous solution is 0.64. The mole fraction of methanol XM satisfies________________?
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A. XM = 0.5

B. XM < 0.5

C. 0.5 < XM < 0.64

D. XM ? 0.64
135. Which is an acidic refractory ?
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A. Magnesite

B. Dolomite

C. Fireclay

D. Chrome magnesite

136. Water content in ground refractory material to be shaped into bricks by hand moulding is about _____________ percent?
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A. 55

B. 40

C. 5

D. 20
137. Pure aniline is evaporating through a stagnant air film of 1 mm thickness at 300 K and a total pressure of 100 KPa. The vapor pressure of aniline at 300 K is 0.1 KPa. The total molar concentration under these conditions is 40.1 mole/m3. The diffusivity of aniline in air is 0.74 10-5m2/s. The numerical value of mass transfer co-efficient is 7.4 10-3. Its units are_______________________?
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A. mole/m2.s.Pa

B. m/s

C. cm/s

D. k.mole/m2.s.Pa

138. In panel test for spalling resistance, the average face temperature of panel assembly is maintained at _____________ C for 24 hours?
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A. 700

B. 1600

C. 1000

D. 2000

139. 1 BTU/ft3 is approximately equal to _____________ kcal/m3?
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A. 1

B. 9

C. 252

D. 4

140. Solution made by dissolving equimolar amounts of different solutes in the same amount of a given solvent will have the______________________?
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A. Elevation in boiling point in the ratio of their molecular weights

B. Same elevation in boiling point

C. None of these

D. Different elevation in boiling point