MCQOPTIONS
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MCQOPTIONS
This section includes 401 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
Molecular weight of crude oil is in the range of |
| A. | 100-120 |
| B. | 230-250 |
| C. | 450-550 |
| D. | 600-850 |
| Answer» C. 450-550 | |
| 152. |
With increase in density, the viscosity of petroleum products |
| A. | increases |
| B. | decreases |
| C. | remains same |
| D. | either (a) or (b) |
| Answer» B. decreases | |
| 153. |
Which of the following is the most important property for a jet fuel ? |
| A. | Cloud point |
| B. | Pour point |
| C. | Colour |
| D. | Freezing point |
| Answer» E. | |
| 154. |
Sour crude means the __________ bearing crude. |
| A. | asphalt |
| B. | sulphur compounds |
| C. | wax |
| D. | nitrogen compounds |
| Answer» C. wax | |
| 155. |
The solvent used in Barisol dewaxing process is |
| A. | hexane |
| B. | furfural |
| C. | benzol and ethylene dichloride |
| D. | methyl ethyl ketone (MEK) |
| Answer» D. methyl ethyl ketone (MEK) | |
| 156. |
A typical yield of kerosene in straight run distillation of crude oil may be about __________ percent. |
| A. | 4 |
| B. | 10 |
| C. | 18 |
| D. | 26 |
| Answer» C. 18 | |
| 157. |
Catalyst used in isomerisation process is |
| A. | H2SO4 |
| B. | H3PO4 |
| C. | HF |
| D. | AlCl3 |
| Answer» E. | |
| 158. |
The pressure (kg/cm2 ) and temperature (°C) maintained in electrical desalters for crude oil are respectively$ |
| A. | 10 and 120 |
| B. | 1 and 200 |
| C. | 50 and 250 |
| D. | 10 and 300 |
| Answer» C. 50 and 250 | |
| 159. |
Cetane number of alpha methyl naphthalene is assumed to be |
| A. | 0 |
| B. | 100 |
| C. | 50 |
| D. | ‚àû |
| Answer» B. 100 | |
| 160. |
Hydrofining is the most recent and effective method for the |
| A. | removal of sulphur. |
| B. | improvement of smoke point. |
| C. | reduction of breathing loss. |
| D. | improvement of viscosity index. |
| Answer» B. improvement of smoke point. | |
| 161. |
Which of the following is the most widely used cracking process in oil refineries ? |
| A. | Dubbs process. |
| B. | T.C.C. moving bed process. |
| C. | Fluidised bed catalytic cracking process. |
| D. | Houdry's fixed bed process. |
| Answer» D. Houdry's fixed bed process. | |
| 162. |
Naphthenic acid is represented by |
| A. | CnH2n+2O2 |
| B. | CnH2n-2O2 |
| C. | CnH2n+2O2 (n ‚â• 6) |
| D. | CnH2n+6O2 (n ≤ 6) |
| Answer» C. CnH2n+2O2 (n ‚â• 6) | |
| 163. |
In a refinery petroleum crude is fractionated into gas fraction, light ends, intermediate distillates, heavy distillates, residues and by products. The group of products including gas oil, diesel oil and heavy fuel oil belongs to the fraction |
| A. | heavy distillates |
| B. | intermediate distillates |
| C. | light ends |
| D. | residues |
| Answer» B. intermediate distillates | |
| 164. |
Natural gasoline is produced |
| A. | from oil wells |
| B. | in oil refineries |
| C. | by natural gas stripping |
| D. | none of these |
| Answer» D. none of these | |
| 165. |
In case of liquid petrofuels, momentary combustion is observed at its |
| A. | flash point. |
| B. | preheating temperature corresponding to viscosity of 25 centistokes. |
| C. | flame temperature. |
| D. | fire point. |
| Answer» B. preheating temperature corresponding to viscosity of 25 centistokes. | |
| 166. |
Which one is preferred for aircraft engine ? |
| A. | High viscosity index lube oil. |
| B. | Low viscosity index lube oil. |
| C. | High freezing point aviation fuel. |
| D. | None of these. |
| Answer» B. Low viscosity index lube oil. | |
| 167. |
Research octane number refers to the |
| A. | low octane number motor fuels. |
| B. | high octane number motor fuels. |
| C. | high octane number aviation fuels. |
| D. | unleaded motor fuels. |
| Answer» E. | |
| 168. |
Higher boiling fractions like atmospheric residue is distilled under vacuum at low temperature because at high temperature, there is a tendency of the predominance of |
| A. | thermal cracking |
| B. | gum formation |
| C. | coking |
| D. | discoloration |
| Answer» D. discoloration | |
| 169. |
Products drawn from the top to bottom of the crude oil distillation column has progressively increasing |
| A. | boiling points |
| B. | molecular weight |
| C. | C/H ratio |
| D. | all (a), (b) and (c) |
| Answer» E. | |
| 170. |
An upper limit of oil content is limited to about __________ percent for achieving efficient and satisfactory level of wax sweating. |
| A. | 5 |
| B. | 15 |
| C. | 40 |
| D. | 60 |
| Answer» D. 60 | |
| 171. |
Catalyst used in the isomerisation is |
| A. | aluminium chloride |
| B. | alumina |
| C. | nickel |
| D. | phosphoric acid |
| Answer» B. alumina | |
| 172. |
Maximum use of petroleum coke is in |
| A. | adsorption refining operation. |
| B. | fuel gas manufacture. |
| C. | carbon electrode manufacture. |
| D. | iron ore reduction. |
| Answer» D. iron ore reduction. | |
| 173. |
Which of the following contains maximum sulphur ? |
| A. | Diesel |
| B. | Petrol |
| C. | Kerosene |
| D. | Fuel oil |
| Answer» E. | |
| 174. |
Petroleum liquid fuels having flash point greater than 66°C is considered as safe during storage and handling. Which of the following has flash point > 66°C ?$ |
| A. | Naphtha |
| B. | Petrol |
| C. | Kerosene |
| D. | Heavy fuel oil |
| Answer» E. | |
| 175. |
Petroleum coke is commercially produced by the __________ process. |
| A. | hydrocracking |
| B. | visbreaking |
| C. | fluid catalytic cracking |
| D. | delayed coking |
| Answer» E. | |
| 176. |
Gasoline extracted from natural gas (by compression and cooling) is called the __________ gasoline. |
| A. | polymer |
| B. | unleaded |
| C. | casing head |
| D. | straight run |
| Answer» C. casing head | |
| 177. |
Reid vapour pressure of gasoline is the measure of its |
| A. | pour point |
| B. | cloud point |
| C. | vapour locking tendency |
| D. | carbon residue |
| Answer» D. carbon residue | |
| 178. |
Water separometer index (modified) (WSIM) of a petrofuel is the measure of its |
| A. | emulsification tendency. |
| B. | water separation characteristics. |
| C. | water content. |
| D. | water absorbing capacity from atmosphere. |
| Answer» C. water content. | |
| 179. |
Catalytic cracking compared to thermal cracking of residue of vacuum distillation of crude oil |
| A. | gives higher yield of petrol. |
| B. | lower octane number of petrol. |
| C. | higher sulphur content in the product. |
| D. | higher gum forming material in petrol. |
| Answer» B. lower octane number of petrol. | |
| 180. |
Pressure maintained in the high pressure primary tower of a three stage crude oil distillation system is about __________ kg/cm2 . |
| A. | 1.5 |
| B. | 3 |
| C. | 6 |
| D. | 12 |
| Answer» C. 6 | |
| 181. |
Doctor's solution used for sweetening of petroleum products is |
| A. | sodium plumbite |
| B. | sodium sulphite |
| C. | sodium thiosulphate |
| D. | lead sulphate |
| Answer» B. sodium sulphite | |
| 182. |
Carbon percentage (by weight) in crude petroleum may be about |
| A. | 65 |
| B. | 75 |
| C. | 85 |
| D. | 95 |
| Answer» D. 95 | |
| 183. |
Higher pressure in the reforming reactor |
| A. | increases coke formation. |
| B. | increases the rate of reaction. |
| C. | produces high octane number gasoline. |
| D. | none of these. |
| Answer» E. | |
| 184. |
Electrical desalting of crude oil removes the __________ impurities. |
| A. | oleophilic |
| B. | oleophobic |
| C. | both (a) and (b) |
| D. | neither (a) nor (b) |
| Answer» C. both (a) and (b) | |
| 185. |
Waxes present in petroleum products |
| A. | can be separated out by distillation. |
| B. | are not soluble in them. |
| C. | crystallise out at low temperature. |
| D. | decrease their viscosity. |
| Answer» D. decrease their viscosity. | |
| 186. |
Petroleum |
| A. | is optically active. |
| B. | constitutes mainly of olefins. |
| C. | does not contain asphalt. |
| D. | does not contain aromatics. |
| Answer» B. constitutes mainly of olefins. | |
| 187. |
Which one is used to determine the colour of petroleum products ? |
| A. | Colour comparator |
| B. | Saybolt chromometer |
| C. | Cleveland apparatus |
| D. | None of these |
| Answer» B. Saybolt chromometer | |
| 188. |
Dearomatisation of kerosene (by liquid sulphur dioxide extraction) is done to |
| A. | increase its smoke point. |
| B. | improve its oxidation stability. |
| C. | decrease the breathing loss. |
| D. | none of these. |
| Answer» C. decrease the breathing loss. | |
| 189. |
Mercaptans are added to liquefied petroleum gas (LPG) to |
| A. | reduce its cost. |
| B. | narrow down its explosion limit. |
| C. | assist in checking its leakage from cylinder. |
| D. | increase its calorific value. |
| Answer» D. increase its calorific value. | |
| 190. |
Highest quality bitumen is produced from the __________ crude oil. |
| A. | paraffinic |
| B. | naphthenic |
| C. | intermediate |
| D. | mixed |
| Answer» C. intermediate | |
| 191. |
Name the hydrocarbon having the poorest oxidation stability. |
| A. | naphthene |
| B. | olefin |
| C. | paraffin |
| D. | aromatics |
| Answer» E. | |
| 192. |
Visbreaking |
| A. | uses natural gas as feed. |
| B. | is carried out at atmospheric pressure. |
| C. | produces fuel oil of lower viscosity. |
| D. | produces gasoline only. |
| Answer» D. produces gasoline only. | |
| 193. |
Octane numbers of motor gasoline used in India and America are respectively |
| A. | 87 & 94 |
| B. | 94 && 87 |
| C. | 94 && 100 |
| D. | 83 && 100 |
| Answer» B. 94 && 87 | |
| 194. |
Specific gravity of a petroleum product gives an indication of its |
| A. | degree of refinement. |
| B. | hydrocarbon content type (aromatic or paraffinic). |
| C. | ease of atomisation. |
| D. | sulphur content. |
| Answer» C. ease of atomisation. | |
| 195. |
The vacuum maintained in vacuum distillation unit for reduced crude is about __________ mmHg. |
| A. | 1.2 |
| B. | 12 |
| C. | 120 |
| D. | 700 |
| Answer» D. 700 | |
| 196. |
"Breathing loss" on storage of gasoline occurs due to the |
| A. | presence of unsaturated air. |
| B. | fluctuation of ambient temperature during day and night. |
| C. | both (a) and (b). |
| D. | neither (a) nor (b). |
| Answer» C. both (a) and (b). | |
| 197. |
Clay treatment of petroleum products |
| A. | decolorises & stabilises cracked gasoline. |
| B. | desulphurise straight run gasoline & kerosene. |
| C. | adsorb arsenic from feedstock to catalytic reforming. |
| D. | all (a), (b) & (c). |
| Answer» E. | |
| 198. |
Which of the following has the maximum °API gravity of all?$ |
| A. | Diesel |
| B. | Kerosene |
| C. | Petrol |
| D. | Furnace oil |
| Answer» D. Furnace oil | |
| 199. |
True vapour pressure of a petroleum fraction __________ Reid vapour pressure. |
| A. | is less than |
| B. | is more than |
| C. | is same as |
| D. | may be either more or less than |
| Answer» C. is same as | |
| 200. |
Sweetening of petroleum product means the removal of |
| A. | sulphur & its compounds |
| B. | water |
| C. | organic impurities |
| D. | wax |
| Answer» B. water | |