MCQOPTIONS
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MCQOPTIONS
This section includes 332 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
The accumulation in a steady state combustion process, burning 1 kg mole of carbon with 1 kg mole of oxygen thereby producing 1 kg mole of carbon dioxide, is _____________ kg mole? |
| A. | 1 |
| B. | 0 |
| C. | 16 |
| D. | 44 |
| Answer» C. 16 | |
| 102. |
Saturated solution of benzene in water is in equilibrium with a mixture of air and vapours of benzene and water at room temperature and pressure. Mole fraction of benzene in liquid is xB and the vapour pressures of benzene and water at these conditions are pv B and pv w respectively. The partial pressure of benzene in air-vapour mixture is_________________? |
| A. | PvB |
| B. | xB.PvB |
| C. | (Patm – Pvw)xB |
| D. | xB.Patm |
| Answer» C. (Patm – Pvw)xB | |
| 103. |
Saturated molal absolute humidity of the vapor-gas mixture depends upon the______________________? |
| A. | Vapor pressure at dry bulb temperature |
| B. | Total pressure |
| C. | Both A. and B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 104. |
Roof of a basic electric furnace is made of ______________ bricks? |
| A. | Superduty fireclay |
| B. | Silica |
| C. | Chromite |
| D. | None of these |
| Answer» C. Chromite | |
| 105. |
Refractory bricks with lower permeability is produced by using _________________? |
| A. | Higher firing temperature |
| B. | Higher moulding pressure |
| C. | Finer grog size |
| D. | All A., B. and C. |
| Answer» E. | |
| 106. |
Refractory bricks having lower porosity have _____________________? |
| A. | High insulating properties |
| B. | Low heat capacity |
| C. | Low thermal conductivity |
| D. | Greater strength |
| Answer» E. | |
| 107. |
Refractoriness/fusion points of ‘Superduty’ refractories is _____________ °C? |
| A. | 1520-1630 |
| B. | 1630-1670 |
| C. | > 1730 |
| D. | > 2000 |
| Answer» D. > 2000 | |
| 108. |
Refractories used in/for ______________ should have low thermal conductivity? |
| A. | Coke ovens |
| B. | Insulation |
| C. | Regenerators |
| D. | Muffle furnaces |
| Answer» C. Regenerators | |
| 109. |
Refluxing of part of the distillate in a fractionating column is a ‘recycling operation’, aimed primarily at_______________? |
| A. | Heat conservation |
| B. | Yield enhancement |
| C. | Product enrichment |
| D. | None of these |
| Answer» D. None of these | |
| 110. |
Recycling in a chemical process facilitates___________________? |
| A. | Increased yield |
| B. | Enrichment of product |
| C. | Heat conservation |
| D. | All A., B. & C. |
| Answer» E. | |
| 111. |
Real gases approach ideal behaviour at___________________? |
| A. | High pressure & high temperature |
| B. | Low pressure & high temperature |
| C. | High pressure & low temperature |
| D. | Low pressure & low temperature |
| Answer» C. High pressure & low temperature | |
| 112. |
Raoult’s law states that ‘the equilibrium vapor pressure that is exerted by a component in a solution is proportional to the mole fraction of that component’. This generalisation is based on the assumption that the________________? |
| A. | Sizes of the component molecules are approximately equal |
| B. | Attractive forces between like and unlike molecules are approximately equal |
| C. | Component molecules are non-polar and no chemical combination or molecular association between unlike molecules takes place in the formation of the so |
| D. | All A., B. & C. |
| Answer» E. | |
| 113. |
Raoult’s law is obeyed by a _____________ solution? |
| A. | Saturated |
| B. | Molar |
| C. | Normal |
| D. | None of these |
| Answer» E. | |
| 114. |
Raoult’s law is not applicable to the___________________? |
| A. | Solutes which dissociate or associate in the particular solution |
| B. | Concentrated solutions |
| C. | Both B. & C. |
| D. | Solutions containing non-volatile solute |
| Answer» D. Solutions containing non-volatile solute | |
| 115. |
Quartz is__________________? |
| A. | Stable form of silica upto 870°C |
| B. | Converted to Tridymite on firing between 870 to 1470°C |
| C. | Transformed to Cristobalite on heating above 1470°C |
| D. | All A., B. and C. |
| Answer» E. | |
| 116. |
Pure oxygen is mixed with air to produce an enriched air containing 50 volume % of oxygen. The ratio of moles of air to oxygen used is_________________? |
| A. | 1.72 |
| B. | 0.58 |
| C. | 0.5 |
| D. | 0.2 |
| Answer» C. 0.5 | |
| 117. |
Pure oxide refractories are generally monocrystalline in nature and are self bonded ______________ bricks are generally used as moderator in nuclear reactors? |
| A. | Beryllia |
| B. | Carborundum |
| C. | Corundum |
| D. | Thoria |
| Answer» B. Carborundum | |
| 118. |
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_______________________? |
| A. | m/s |
| B. | cm/s |
| C. | mole/m2.s.Pa |
| D. | k.mole/m2.s.Pa |
| Answer» D. k.mole/m2.s.Pa | |
| 119. |
Presence of MgO in alumino-silicate refractories ______________ its refractoriness ? |
| A. | Increases |
| B. | Lowers |
| C. | Does not affect |
| D. | Either A. or B.; depends on its quantity |
| Answer» C. Does not affect | |
| 120. |
Pick out the wrong unit conversion of temperature? |
| A. | °R = 273 + °F |
| B. | Temperature difference of 1°K = 1°C = 9/5°F |
| C. | °C = (F- 32) × 0.555 |
| D. | °F = (°C + 17.778) × 1.8 |
| Answer» B. Temperature difference of 1°K = 1°C = 9/5°F | |
| 121. |
Pick out the wrong unit conversion of thermal conductivity ? |
| A. | 1 BTU/ft2.hr.°F/ft = 1.488 kcal/m2. hr.°C/m |
| B. | 1 BTU/ft2.hr.°F/inch = 1.488 kcal/m2. hr.°C/m |
| C. | 1 kcal/m.hr.°C = 0.672 BTU/ft.hr.°F = 1.163 W/m. °K |
| D. | 1 W/cm.°C = 85.985 kcal/m.hr.°C = 57.779 BTU/ft.hr.°F |
| Answer» C. 1 kcal/m.hr.°C = 0.672 BTU/ft.hr.°F = 1.163 W/m. °K | |
| 122. |
Pick out the wrong unit conversion of mass transfer co-efficient? |
| A. | 1 lb/hr.ft3.atm. = 4.8182 kg/hr.m2.bar |
| B. | 1 kg/hr.m2.atm= 0.98687 kg/hr. m .bar |
| C. | 1 lb/hr.ft2 = 4.8823 kg/hr.m2 |
| D. | 1 kg/hr.m2 = 4.8823 lb/hr.ft2 |
| Answer» E. | |
| 123. |
Pick out the wrong unit conversion of heat transfer rate? |
| A. | 1 kcal/hr= 1.163 Watt |
| B. | 1 Watt = 1.163 kcal/hr |
| C. | 1 BTU/ft2.hr = 2.712 kcal/m2.hr |
| D. | 1 kcal/m2.hr = 0.3687 BTU/ft2.hr = 1.163 Watt/m2 |
| Answer» C. 1 BTU/ft2.hr = 2.712 kcal/m2.hr | |
| 124. |
Pick out the wrong unit conversion of calorific value? |
| A. | 1 kcal/kg = 1.8 BTU/lb = 4.186 kJ/kg |
| B. | 1 BTU/ft3 = 8.9 kcal/m3 = 0.038 MJ/m3 |
| C. | 1 BTU/lb = 2.3 kcal/kg |
| D. | 1 kcal/m3 = 0.1124 BTU/ft3 |
| Answer» D. 1 kcal/m3 = 0.1124 BTU/ft3 | |
| 125. |
Pick out the wrong unit conversion of heat transfer co-efficient? |
| A. | 1 kcal/m2.hr.°C = 0.2048 BTU/ft2.hr. °F. = 1.163 W/m2.°K |
| B. | 1 kcal/m2.hr.°K = 1.163 W/m2.°C |
| C. | 1 W/m2.°C = 0.1761 BTU/ft2.hr.°F. |
| D. | 1 BTU/ft2.hr.°F = 4.88 kcal/m2.hr.°C = 20.44 kJ/m2.hr°C = 5.678 W/m2.°C |
| Answer» C. 1 W/m2.°C = 0.1761 BTU/ft2.hr.°F. | |
| 126. |
Pick out the wrong statement about the recycle stream in a process ? |
| A. | Recycling in a process stream helps in utilising the valuable reactants to the maximum with minimum loss of reactants |
| B. | The ratio of the quantity of a reactant present in the reactor feed of a recycling operation to the quantity of the same reactant entering the process |
| C. | Recycling in a process does not help in getting higher extent of reaction |
| D. | Recycling is exemplified by refluxing back a part of the distillate to the distillation column to maintain the quantity of liquid within the column |
| Answer» D. Recycling is exemplified by refluxing back a part of the distillate to the distillation column to maintain the quantity of liquid within the column | |
| 127. |
Pick out the correct conversion? |
| A. | 1 BTU =453.6 calories |
| B. | 1 BTU = 252 calories |
| C. | 1 calorie = 252 BTU |
| D. | 1 calorie = 453.6 BTU |
| Answer» C. 1 calorie = 252 BTU | |
| 128. |
pH value of a solution containing equal concentration of hydroxyl and hydrogen ions will be_________________? |
| A. | 0 |
| B. | 10 |
| C. | 7 |
| D. | 14 |
| Answer» D. 14 | |
| 129. |
pH value of a solution containing 1 gm of hydrogen ion per litre will be ____________________? |
| A. | 0 |
| B. | 1 |
| C. | 7 |
| D. | 10 |
| Answer» B. 1 | |
| 130. |
pH value of H2SO4 (5% concentration) is__________________? |
| A. | 5 |
| B. | 7 |
| C. | > 7 |
| D. | < 7 |
| Answer» E. | |
| 131. |
Permeability of bricks is a measure of the___________________? |
| A. | Refractoriness |
| B. | Melting point |
| C. | Rate at which a fluid will pass through the pores |
| D. | Expansion during heating |
| Answer» D. Expansion during heating | |
| 132. |
Percentage saturation of a vapor bearing gas is always _____________ the relative saturation? |
| A. | Higher than |
| B. | Smaller than |
| C. | Equal to |
| D. | Either A. or B.; depends on the system |
| Answer» C. Equal to | |
| 133. |
Panel test determines the ______________ of refractories? |
| A. | Fusion point |
| B. | Spalling resistance |
| C. | Slag penetration resistance |
| D. | Refractoriness under load (RUL) |
| Answer» C. Slag penetration resistance | |
| 134. |
Outer combustion chamber of blast furnace stove is lined with _______________ bricks? |
| A. | Fireclay |
| B. | Silica |
| C. | Chrome magnesite |
| D. | Zirconia |
| Answer» B. Silica | |
| 135. |
Othmer chart is useful in estimating the heat of_______________? |
| A. | Mixing |
| B. | Wetting |
| C. | Adsorption |
| D. | None of these |
| Answer» D. None of these | |
| 136. |
Osmotic pressure of the solution can be increased by_________________? |
| A. | Decreasing its temperature |
| B. | Increasing the volume of the vessel containing the solution |
| C. | Diluting the solution |
| D. | None of these |
| Answer» E. | |
| 137. |
Osmotic pressure of a dilute solution of a non volatile solute in a solvent obeying Raoult’s law is proportional to the_____________? |
| A. | Temperature |
| B. | Volume of solution |
| C. | Moles of non-volatile solute |
| D. | None of these |
| Answer» B. Volume of solution | |
| 138. |
Osmotic pressure exerted by a solution prepared by dissolving one gram mole of a solute in 22.4 litres of a solvent at 0°C will be _______________ atmosphere? |
| A. | 0.5 |
| B. | 1 |
| C. | 1.5 |
| D. | 2 |
| Answer» C. 1.5 | |
| 139. |
One ‘Therm’ is equivalent to___________________? |
| A. | 105 BTU |
| B. | 105 kcal |
| C. | 109 BTU |
| D. | 109 kcal |
| Answer» B. 105 kcal | |
| 140. |
One of the specific gravity scales is “Brix” (used specifically for sugar solution). It is defined as ______________? |
| A. | Brix = (400/G) – 400 |
| B. | Brix = 200 (G-1) |
| C. | Brix = 145 – (145/G) |
| D. | None of these |
| Answer» B. Brix = 200 (G-1) | |
| 141. |
One Newton is equal to ______________ dynes? |
| A. | 102 |
| B. | 103 |
| C. | 104 |
| D. | 105 |
| Answer» E. | |
| 142. |
One mole of methane undergoes complete combustion in a stoichiometric amount of air. The reaction proceeds as CH4 + 2O2 → CO2 + 2H2O. Both the reactants and products are in gas phase. ΔH°298 = – 730 kJ/mole of methane. Mole fraction of water vapour in the product gases is about_____________________? |
| A. | 0.19 |
| B. | 0.33 |
| C. | 0.40 |
| D. | 0.67 |
| Answer» B. 0.33 | |
| 143. |
One micron is equal to _____________ cm? |
| A. | 10-2 |
| B. | 10-4 |
| C. | 10-6 |
| D. | 10-8 |
| Answer» C. 10-6 | |
| 144. |
One kg of saturated steam at 100°C and 1.01325 bar is contained in a rigid walled vessel. It lias a volume of 1.673 m3. It cools to 98°C; the saturation pressure is 0.943 bar ; one kg of water vapour under these conditions has a volume of 1.789 m3. The latent heat of condensation (kJ/kg-1 ) under these conditions is___________________? |
| A. | 40732 |
| B. | 2676 |
| C. | 2263 |
| D. | 540 |
| Answer» D. 540 | |
| 145. |
On mixing 56 gm of CaO with 63 gm of HNO3, the amount of Ca(NO3)2 formed is ______________ gm? |
| A. | 82 |
| B. | 164 |
| C. | 41 |
| D. | 8.2 |
| Answer» B. 164 | |
| 146. |
On addition of 1 c.c. of dilute hydrochloric acid (1% concentration) to 80 c.c. of a buffer solution of pH = 4, the pH of the solution becomes_________________? |
| A. | 1 |
| B. | 8 |
| C. | 4 |
| D. | 2 |
| Answer» D. 2 | |
| 147. |
Number of gram equivalent of solute dissolved in one litre of solution is called its___________________? |
| A. | Normally |
| B. | Molarity |
| C. | Molality |
| D. | Formality |
| Answer» B. Molarity | |
| 148. |
Number of gm moles of solute dissolved in 1 kg of solvent is called its___________________? |
| A. | Normality |
| B. | Molarity |
| C. | Molality |
| D. | Formality |
| Answer» D. Formality | |
| 149. |
Number of gm moles of solute dissolved in one liter of a solution is called its____________________? |
| A. | Equivalent weight |
| B. | Molarity |
| C. | Molality |
| D. | Normality |
| Answer» C. Molality | |
| 150. |
N.T.P. corresponds to__________________? |
| A. | 1 atm absolute pressure & 0°C |
| B. | 760 mm Hg gauge pressure & 0°C |
| C. | 760 torr & 15°C |
| D. | 101.325 KPa gauge pressure & 0°C |
| Answer» B. 760 mm Hg gauge pressure & 0°C | |