MCQOPTIONS
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MCQOPTIONS
This section includes 1154 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. |
In a multi-cylinder diesel engine, the cylinders are fired in a particular sequence |
| A. | to reduce fuel consumption |
| B. | to reduce knocking |
| C. | to reduce engine vibrations |
| D. | all of the above |
| Answer» D. all of the above | |
| 102. |
In jet propulsion of ships, when the inlet orifices are at right angles to the direction of motion of the ships, the efficiency of propulsion η isWhere:V = Absolute velocity of the issuing jetu = Velocity of the moving ship |
| A. | \(\frac{{2{u^2}}}{{V + u}}\) |
| B. | \(\frac{{2Vu}}{{{{\left( {V + u} \right)}^2}}}\) |
| C. | \(\frac{{2u}}{{{{\left( {V + u} \right)}^2}}}\) |
| D. | \(\frac{{2Vu}}{{V + 2u}}\) |
| Answer» C. \(\frac{{2u}}{{{{\left( {V + u} \right)}^2}}}\) | |
| 103. |
_________ involves breaking of fuel into fine particles. |
| A. | Fine atomization of fuel |
| B. | Air supply at increased pressure |
| C. | Mixing of fuel and air |
| D. | Excess supply of air |
| Answer» B. Air supply at increased pressure | |
| 104. |
If mf is the mass of fuel supplied per kg of air in one second, then the mass of gases leaving the nozzle of turbojet will be |
| A. | 1 - mf |
| B. | 1/(1 - mf) |
| C. | 1 + mf |
| D. | 1/(1 + mf) |
| Answer» D. 1/(1 + mf) | |
| 105. |
EGR system recirculates a small metered amount of the inert exhaust gas back into the intake manifold: |
| A. | To reduce the combustion temperature and lower the formation of N2 |
| B. | To reduce the peak combustion temperature and lower the formation of NO |
| C. | To increase the peak combustion temperature and lower the formation of NO |
| D. | To reduce the exhaust gas temperature and lower the formation of particulate matter. |
| Answer» C. To increase the peak combustion temperature and lower the formation of NO | |
| 106. |
Combustion that takes place at high speed is called_________. |
| A. | Spontaneous burning |
| B. | Explosion |
| C. | Incomplete burning |
| D. | Rapid combustion |
| E. | None of the above |
| Answer» E. None of the above | |
| 107. |
Naphthalene is removed from coke oven gas by |
| A. | scrubbing with wash oil (a petroleum product). |
| B. | adsorbing on bog iron bed. |
| C. | absorbing in vetro-coke solution. |
| D. | none of these. |
| Answer» B. adsorbing on bog iron bed. | |
| 108. |
The reaction, C + CO₂ ↔ 2CO, taking place during coal gasification is called the __________ reaction. |
| A. | Neumann reversal |
| B. | shift conversion |
| C. | Boudouard |
| D. | reduction |
| Answer» D. reduction | |
| 109. |
Which of the following has the least calorific value (kcal/Nm³) ? |
| A. | Blast furnace gas |
| B. | Coke oven gas |
| C. | Sewage gas |
| D. | Natural gas |
| Answer» B. Coke oven gas | |
| 110. |
Kopper-Totzek coal gasifier |
| A. | can give ammonia synthesis gas (H₂ + N₂). |
| B. | is a moving bed reactor. |
| C. | cannot use coking coal. |
| D. | operate at very high pressure. |
| Answer» B. is a moving bed reactor. | |
| 111. |
Fat coal' means a coal having |
| A. | low calorific value. |
| B. | high volatile matter, |
| C. | low ash content. |
| D. | non smoking tendency. |
| Answer» C. low ash content. | |
| 112. |
Quantity of coke oven gas produced by high temperature carbonisation of one ton of dry coal may be around __________ Nm³ . |
| A. | 30 |
| B. | 300 |
| C. | 3000 |
| D. | 30, 000 |
| Answer» C. 3000 | |
| 113. |
Bulk density of pulverised coal may be about __________ kg/m³. |
| A. | 100 |
| B. | 500 |
| C. | 1000 |
| D. | 1500 |
| Answer» C. 1000 | |
| 114. |
Which of the following has the highest calorific value (kcal/Nm³) ? |
| A. | Carburetted water gas |
| B. | Gobar gas |
| C. | Natural gas |
| D. | LPG |
| Answer» E. | |
| 115. |
Lurgi coal gasifier is a pressurised __________ bed reactor. |
| A. | moving |
| B. | fixed |
| C. | fluidised |
| D. | entrained |
| Answer» B. fixed | |
| 116. |
Which adsorbent is used for removing sulphur compounds (S Q, H₂S, RSH etc.) removal from coke oven gas in by-products recovery plant ? |
| A. | Silica gel |
| B. | Diatomaceous earth |
| C. | Basalt |
| D. | Bog iron (i.e., moist ferric hydroxide) |
| Answer» E. | |
| 117. |
Calorific value of gobar gas (containing CH₄ = 60% , H₂ = 10% ; CO₂ = 30%) may be about __________ Kcal/Nm³. |
| A. | 1800 |
| B. | 3200 |
| C. | 5400 |
| D. | 10200 |
| Answer» D. 10200 | |
| 118. |
The combustion reaction, C + O₂ = CO₂, is |
| A. | exothermic |
| B. | endothermic |
| C. | autocatalytic |
| D. | none of these |
| Answer» B. endothermic | |
| 119. |
Oxygen required for theoretically complete combustion of 1 Nm³ methane is __________ Nm³. |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 1 |
| Answer» B. 4 | |
| 120. |
Proximate analysis of coal determines its __________ content. |
| A. | moisture, ash, sulphur & volatile matter. |
| B. | moisture, volatile matter, ash & fixed carbon. |
| C. | moisture, sulphur, nitrogen & fixed carbon. |
| D. | none of these. |
| Answer» C. moisture, sulphur, nitrogen & fixed carbon. | |
| 121. |
The main product of high temperature carbonisation of coal is |
| A. | coke |
| B. | ammonia |
| C. | tar |
| D. | coke oven gas |
| Answer» B. ammonia | |
| 122. |
Dust content in raw blast furnace gas is about __________ gm/Nm³ , hence it is cleaned to the dust level of about < 10 mg /Nm³ before use. |
| A. | 15-30 |
| B. | 1-2 |
| C. | 70-100 |
| D. | 150-200 |
| Answer» B. 1-2 | |
| 123. |
Theoretical flame temperature of a fuel is that temperature which is attained, when the fuel is completely burnt using theoretical amount of air in |
| A. | air |
| B. | oxygen |
| C. | either (a) or (b) |
| D. | either (a) or (b) without gain or loss of heat |
| Answer» E. | |
| 124. |
High temperature carbonisation of coal takes place at __________ °C. |
| A. | 2000 |
| B. | 600 |
| C. | 1100 |
| D. | 1600 |
| Answer» D. 1600 | |
| 125. |
About __________ Nm³ of air will be required for the complete combustion of 2 Nm³ of CO. |
| A. | 2 |
| B. | 3 |
| C. | 5 |
| D. | 1 |
| Answer» D. 1 | |
| 126. |
The catalyst used in shift converter is |
| A. | nickel |
| B. | vanadium |
| C. | silica gel |
| D. | alumina |
| Answer» B. vanadium | |
| 127. |
Pure carbon is completely burnt in oxygen. The flue gas analysis is 70% CO₂, 20% CO and 10% O₂. The percent excess oxygen used is |
| A. | 20 |
| B. | 12.5 |
| C. | 0 |
| D. | 10 |
| Answer» D. 10 | |
| 128. |
Which of the following is not a by-product fuel ? |
| A. | Pitch |
| B. | Blast furnace gas |
| C. | Petrol |
| D. | Refinery gas |
| Answer» D. Refinery gas | |
| 129. |
Pick the odd man out. |
| A. | Briquettes |
| B. | Wood |
| C. | Oil gas |
| D. | Pitch creosote mixture |
| Answer» C. Oil gas | |
| 130. |
For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm³ ), while the C.V. is same on weight basis (i.e., kcal/kg) ? |
| A. | Propane and acetylene |
| B. | Propane and LPG |
| C. | Sewage gas and gobar gas |
| D. | B.F. gas and coke oven gas |
| Answer» B. Propane and LPG | |
| 131. |
Which of the following fuels is the best for burning on chain grate stoker? |
| A. | Non-caking coal |
| B. | Caking coal |
| C. | Coking coal |
| D. | Pulverised coal |
| Answer» B. Caking coal | |
| 132. |
Which is the heaviest fuel gas out of the following? |
| A. | Blast furnace gas |
| B. | Coke oven gas |
| C. | Water gas |
| D. | Carburetted water gas |
| Answer» B. Coke oven gas | |
| 133. |
Which of the following petrographic constituents of coal is non-coking? |
| A. | Vitrain |
| B. | Clarain |
| C. | Durain |
| D. | Fussain |
| Answer» E. | |
| 134. |
Out of the following, which is the most important parameter for the blast furnace grade coke? |
| A. | CSR & CRI |
| B. | Ash content |
| C. | Moisture content |
| D. | Volatile matter content |
| Answer» B. Ash content | |
| 135. |
Temperature of preheated air used for the transportation of pulverised coal through pipes to the burner of a boiler furnace is restricted to a maximum limit of about 300° C to avoid the |
| A. | Requirement of large volume combustion chamber |
| B. | Risk of explosion |
| C. | Chances of clinker formation |
| D. | Incomplete combustion of coal |
| Answer» C. Chances of clinker formation | |
| 136. |
Which of the following has the least calorific value (kcal/Nm³) ? |
| A. | Blast furnace gas |
| B. | Coke oven gas |
| C. | Sewage gas |
| D. | Natural gas |
| Answer» B. Coke oven gas | |
| 137. |
Which of the following has the highest calorific value (kcal/Nm³) ? |
| A. | Carburetted water gas |
| B. | Gobar gas |
| C. | Natural gas |
| D. | LPG |
| Answer» E. | |
| 138. |
If CO₂ is not fully absorbed by the KOH solution meant for its absorption in the orsat apparatus, it will appear as |
| A. | O₂ |
| B. | CO |
| C. | N₂ |
| D. | SO₂ |
| Answer» E. | |
| 139. |
Which of the following would require least amount of secondary air for combustion? |
| A. | Coke breeze containing 25% ash and 2% volatile matter |
| B. | Anthracite containing 10% volatile matter and 8% ash |
| C. | Bituminous coal containing 20% ash and 25% volatile matter |
| D. | Semi-bituminous coal containing 25% ash and 20% volatile matter |
| Answer» B. Anthracite containing 10% volatile matter and 8% ash | |
| 140. |
As the C/H ratio of the fuel increases, the amount of CO₂ formed on combustion __________ for the same percentage of excess air. |
| A. | Decreases |
| B. | Increases |
| C. | Remains same |
| D. | May increase or decrease depending on the type of fuel |
| Answer» C. Remains same | |
| 141. |
Which of the following gaseous fuels has the lowest calorific value? |
| A. | Gobar gas |
| B. | Refinery gas |
| C. | Converter gas |
| D. | Blast furnace gas |
| Answer» E. | |
| 142. |
Which of the following has the highest flame velocity? |
| A. | H₂ |
| B. | CO |
| C. | CH₄ |
| D. | C₂H₆ |
| Answer» B. CO | |
| 143. |
Coke ovens in steel plant are heated by |
| A. | Electricity |
| B. | Coke oven gas |
| C. | Mixed gas |
| D. | Both B & C |
| Answer» E. | |
| 144. |
Which of the following is not a micro component present in coal? |
| A. | Micrinite |
| B. | Clarain |
| C. | Fusinite |
| D. | Liptinite |
| Answer» C. Fusinite | |
| 145. |
Which of the following is a single stage, fixed bed high pressure coal gasification process? |
| A. | Winkler process |
| B. | Kopper-Totzek process |
| C. | Lurgi Process |
| D. | None of these |
| Answer» D. None of these | |
| 146. |
In high temperature carbonisation (as compared to low temperature carbonisation) of coal, the |
| A. | Gas yield is less |
| B. | Tar yield is more |
| C. | Ignition temperature of coke produced is less |
| D. | Aromatic content of tar produced is more |
| Answer» E. | |
| 147. |
Light oil whose major component is benzol, is obtained by the distillation of crude tar in the temperature range of __________ °C. |
| A. | 80-170 |
| B. | 200-300 |
| C. | 250-270 |
| D. | 280-300 |
| Answer» B. 200-300 | |
| 148. |
Which of the following is used for making the explosive 'TNT'? |
| A. | Benzol |
| B. | Toluene |
| C. | Pyridine |
| D. | Cerosote |
| Answer» C. Pyridine | |
| 149. |
Which of the following has the highest flame speed? |
| A. | CO |
| B. | H₂ |
| C. | CH₄ |
| D. | C₂H₆ |
| Answer» C. CH₄ | |
| 150. |
Coke oven gas is stripped of its H₂S and mercaptans content by |
| A. | Absorption in wash oil |
| B. | Adsorption on bog iron bed |
| C. | Bubbling it through dilute sulphuric acid |
| D. | Adsorption on silica gel |
| Answer» C. Bubbling it through dilute sulphuric acid | |