MCQOPTIONS
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MCQOPTIONS
This section includes 908 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. |
For a given fluid, as the pipe diameter increases, the pumping cost |
| A. | decreases. |
| B. | increases. |
| C. | remains unaffected. |
| D. | may increase or decreaes depending upon whether the fluid is Newtonian or non-Newtonion. |
| Answer» B. increases. | |
| 152. |
The following ratio, is normally taken as |
| A. | 0.15-030 |
| B. | 0.5-0.65 |
| C. | 0.75-0.85 |
| D. | 0.60-0.90 |
| Answer» B. 0.5-0.65 | |
| 153. |
For turbulent flow (Nʀe > 2100) of low viscosity fluid (μ > 20cp) in steel pipes, the optimum inside pipe diameter is given by(where, Q = fluid flow rate, ft³/sec.ρ = fluid density, lb/ft³ μ = fluid viscosity, centipoise Dᵢ = optimum inside pipe diameter, inches) |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 154. |
Souders Brown equation given by the following equation, is used for the calculation of the __________ in a continuous distillation column. |
| A. | diameter of the bubble cap column |
| B. | diameter of the seive plate column |
| C. | tray pressure drop |
| D. | residence time in the downcomer for the disengagement of entrained vapour |
| Answer» B. diameter of the seive plate column | |
| 155. |
Pick out the wrong statement. |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» D. D | |
| 156. |
With increase in the number of shell passes, the value of Fᴛ |
| A. | increases |
| B. | decreases |
| C. | remains same |
| D. | remains same, only if the number of tube passes does not change. |
| Answer» B. decreases | |
| 157. |
Lₑ/D for fully open globe value may be around |
| A. | 10 |
| B. | 25 |
| C. | 75 |
| D. | 300 |
| Answer» E. | |
| 158. |
In a shell and tube heat exchanger, the overall heat transfer co-efficient is proportional to the tube side (volumetric flow rate)^0.8. This is valid, only when the ratio of the tube side film resistance to the total resistance is almost equal to |
| A. | ∞ |
| B. | 1 |
| C. | 20.8 |
| D. | 2 |
| Answer» C. 20.8 | |
| 159. |
A perforated plate has holes of diameter dₙ arranged in a pitch pₕ. Each hole has a tube of I.D. dₜ passing through it. The ligament efficiency is given by |
| A. | (pₕ - dₕ)/pₕ |
| B. | (pₕ - dₕ . dₜ/2)/pₕ |
| C. | (pₕ - dₜ)/pₕ |
| D. | (pₕ - dₕ)/dₕ |
| Answer» D. (pₕ - dₕ)/dₕ | |
| 160. |
Annual depreciation cost are not constant when, the __________ method of depreciation calculation is used. |
| A. | straight line |
| B. | sinking fund |
| C. | present worth |
| D. | declining balance. |
| Answer» E. | |
| 161. |
Which of the following is the costliest source of getting hydrogen on commercial scale for the manufacture of nitrogeneous fertiliser ? |
| A. | Coal gasification |
| B. | Steam reforming of naphtha |
| C. | Alectrolysis of water |
| D. | Coke oven gas |
| Answer» D. Coke oven gas | |
| 162. |
The payback method for the measurement of return on investment |
| A. | gives a correct picture of profitability. |
| B. | underemphasises liquidity. |
| C. | does not measure the discounted rate of return. |
| D. | takes into account the cash inflows after the recovery of investments. |
| Answer» D. takes into account the cash inflows after the recovery of investments. | |
| 163. |
Cost incurred towards __________ in a chemical plant is a component of the utilities cost. |
| A. | water supply |
| B. | running a control laboratory |
| C. | property protection |
| D. | medical services |
| Answer» B. running a control laboratory | |
| 164. |
Which of the following ceramic packing materials is the costliest of all ? |
| A. | Berl saddles |
| B. | Raschig rings |
| C. | Pall rings |
| D. | Intalox saddles |
| Answer» B. Raschig rings | |
| 165. |
Which of the following is not a current asset of a chemical company ? |
| A. | Inventories |
| B. | Marketable securities |
| C. | Chemical equipments |
| D. | None of these. |
| Answer» D. None of these. | |
| 166. |
The ratio of working capital to total capital investment for most chemical plants (except for non-seasonal based products) is in the range of __________ percent. |
| A. | 0.1 to 1 |
| B. | 1 to 2 |
| C. | 10 to 20 |
| D. | 50 to 60 |
| Answer» D. 50 to 60 | |
| 167. |
The value of a property decreases __________ with time in straight line method of determining depreciation. |
| A. | linearly |
| B. | non-linearily |
| C. | exponentially |
| D. | logarithmically |
| Answer» B. non-linearily | |
| 168. |
The inventory of raw materials included in the working capital is usually about __________ months supply of raw materials valued at delivery prices. |
| A. | one |
| B. | three |
| C. | six |
| D. | twelve |
| Answer» B. three | |
| 169. |
It is not desirable to design a heat exchanger for LMTD correction factor, Fᴛ, of less than |
| A. | 0.99 |
| B. | 0.95 |
| C. | 0.80 |
| D. | 0.55 |
| Answer» D. 0.55 | |
| 170. |
'Lang factor' is defined as the ratio of the capital investment to the delivered cost of major equipments. The value of 'Lang factor' for fixed capital investment, for a solid-fluid processing chemical plant ranges from |
| A. | 1.2 to 1.4 |
| B. | 2.5 to 2.7 |
| C. | 4.2 to 4.4 |
| D. | 6.2 to 6.4 |
| Answer» D. 6.2 to 6.4 | |
| 171. |
Maximum production start up cost for making a chemical plant operational is about __________ percent of the fixed capital cost. |
| A. | 1 |
| B. | 5 |
| C. | 10 |
| D. | 30 |
| Answer» D. 30 | |
| 172. |
A shareholder has __________ say in the affairs of company management compared to a debenture holder. |
| A. | more |
| B. | less |
| C. | same |
| D. | no |
| Answer» B. less | |
| 173. |
__________ taxes are based on gross earnings. |
| A. | Property |
| B. | Excise |
| C. | Income |
| D. | Capital gain |
| Answer» D. Capital gain | |
| 174. |
A balance sheet for an industrial concern shows |
| A. | the financial condition at any given time. |
| B. | only current assets. |
| C. | only fixed assets. |
| D. | only current and fixed assets. |
| Answer» B. only current assets. | |
| 175. |
Lₑ/D for a Tee (used as elbow, entering branch) would be |
| A. | less than that for Tee (used as elbow, entering run). |
| B. | more than that for Tee (used as elbow, entering run). |
| C. | around 90. |
| D. | both (b) and (c). |
| Answer» E. | |
| 176. |
Relative cost of chemical process plants in India is about __________ percent more than the similar plants in U.S.A. |
| A. | 15 |
| B. | 35 |
| C. | 55 |
| D. | 75 |
| Answer» C. 55 | |
| 177. |
Which of the following is not a mathematical method for evaluation of profitability of a chemical process plant ? |
| A. | Cash reserve. |
| B. | Rate of return on investment. |
| C. | Payout period. |
| D. | Discounted cash flow based on full life performance. |
| Answer» B. Rate of return on investment. | |
| 178. |
Cost of instrumentation in a modern chemical plant ranges from __________ percent of the total plant cost. |
| A. | 5 to 10 |
| B. | 20 to 30 |
| C. | 40 to 50 |
| D. | 60 to 70 |
| Answer» C. 40 to 50 | |
| 179. |
With increase in the discounted cash flow rate of return, the ratio of the total present value to the initial investment of a given project |
| A. | decreases |
| B. | increases |
| C. | increases linearly |
| D. | remains constant |
| Answer» B. increases | |
| 180. |
Lₑ/D for couplings and unions would be |
| A. | 60 |
| B. | 200 |
| C. | 350 |
| D. | negligible |
| Answer» E. | |
| 181. |
Which of the following is not a component of the fixed capital for a chemical plant facility? |
| A. | Raw materials inventory. |
| B. | Utilities plants. |
| C. | Process equipment. |
| D. | Emergency facilities. |
| Answer» B. Utilities plants. | |
| 182. |
Stress-strain diagram for low carbon steel/mild steel is shown below in the Figure. The point 'A' on the Figure represents the |
| A. | breaking stress |
| B. | ultimate stress |
| C. | elastic limit |
| D. | yield point |
| Answer» D. yield point | |
| 183. |
In a rotary drier, the average retention time of solid is (where Z = length of the drier, metres ρ = apparent solid density, kg/m³ L = flow rate of dry solids, kg/see. m² drier cross-section H = hold up of solid.) |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 184. |
Pressure drop due to pipe fittings can be estimated by the following equation, where, Lₑ = equivalent length of straight pipeline which will incur the same frictional loss as the fitting and D = diameter of the fitting. The value of Lₑ/D (dimensionless) for 45° elbow and 180° close return bends would be respectively around |
| A. | 5 and 10 |
| B. | 45 and 75 |
| C. | 180 and 300 |
| D. | 300 and 500 |
| Answer» C. 180 and 300 | |
| 185. |
For annular flow of a fluid, the ratio of the equivalent diameter for pressure drop calculation to the equivalent diameter for heat transfer calculation is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 186. |
For laminar flow (Nʀₑ < 2100) in steel pipe, the optimum inside pipe diameter is given by |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 187. |
The minimum shell thickness for tank ≤ 15 metres diameter is limited to __________ mm, for reasons of elastic stability. |
| A. | 2 |
| B. | 5 |
| C. | 10 |
| D. | 15 |
| Answer» C. 10 | |
| 188. |
Le/D for 90° elbow (medium radius) and 90°square elbow would be respectively around |
| A. | 25 and 60 |
| B. | 3 and 5 |
| C. | 100 and 250 |
| D. | 250 and 600 |
| Answer» B. 3 and 5 | |
| 189. |
Le/D for fully open gate valves would be |
| A. | Much more than that for fully open globe valves |
| B. | Much less (say 2% than that for fully open globe valves) |
| C. | Around 7 |
| D. | Both B and C |
| Answer» E. | |
| 190. |
In case of plain carbon steel, butt welded joints are used for shell plate thickness ≤ __________ cms. . |
| A. | 1.2 |
| B. | 0.5 |
| C. | 3.8 |
| D. | 6.8 |
| Answer» D. 6.8 | |
| 191. |
The raio, (properller agitator dia/tank dia) is normally taken as |
| A. | 0.15-030 |
| B. | 0.5-0.65 |
| C. | 0.75-0.85 |
| D. | 0.60-0.90 |
| Answer» B. 0.5-0.65 | |
| 192. |
What is the minimum recommended ligament for square pitch arrangement in case of heat exchangers? |
| A. | 6.5 cms |
| B. | 6.5 mm |
| C. | Equal to tube I.D |
| D. | Equal to tube O.D |
| Answer» C. Equal to tube I.D | |
| 193. |
Minimum recommended baffle spacing in a shell and tube heat exchanger is about (where, D = shell diameter ) |
| A. | 0.2 D |
| B. | 0.5 D |
| C. | 0.66 D |
| D. | 0.80 D |
| Answer» B. 0.5 D | |
| 194. |
For laminar flow (NRe < 2100) in steel pipe, the optimum inside pipe diameter is given by |
| A. | Di, opt = 3 Q0.36 ρ0.18 |
| B. | Di, opt = 3.9 Q0.45 . ρ0.23 |
| C. | Di, opt = 7.6 Q0.36 . ρ0.9 |
| D. | Di, opt = 3 Q0.36 . ρ1.86 μ0.08 |
| Answer» B. Di, opt = 3.9 Q0.45 . ρ0.23 | |
| 195. |
In a rotary drier, the average retention time of solid is(where Z = length of the drier, metres ρ = apparent solid density, kg/m³ L = flow rate of dry solids, kg/see. m² drier cross-section H = hold up of solid.) |
| A. | Z.H.ρ/L |
| B. | L/Z.H.ρ |
| C. | H.ρ/L |
| D. | Z.H/L.ρ |
| Answer» B. L/Z.H.ρ | |
| 196. |
Pressure drop due to pipe fittings can be estimated by the equation, ΔP/p = 4f.Le/D.V2/2gc, where, Le = equivalent length of straight pipeline which will incur the same frictional loss as the fitting and D = diameter of the fitting. The value of Le/D (dimensionless) for 45° elbow and 180° close return bends would be respectively around |
| A. | 5 and 10 |
| B. | 45 and 75 |
| C. | 180 and 300 |
| D. | 300 and 500 |
| Answer» C. 180 and 300 | |
| 197. |
Pressure drop (Δp) and the superficial gas mass velocity (G) in case of packed absorption tower operating in the preloading range are related as |
| A. | Δp = G |
| B. | Δp = G0.5 |
| C. | Δp = G2 |
| D. | Δp = 1/G0.6 |
| Answer» D. Δp = 1/G0.6 | |
| 198. |
Which of the following is used to set the diameter of the distillation column? |
| A. | Number of theorectical plates |
| B. | Static submergence |
| C. | Allowable vapour velocity |
| D. | Length of straight rectangular weir on cross-flow tray |
| Answer» D. Length of straight rectangular weir on cross-flow tray | |
| 199. |
Which of the following material is seldom used for pressure vessel construction? |
| A. | Rimmed still |
| B. | Mild steel |
| C. | Killed steel |
| D. | Semi-killed steel |
| Answer» B. Mild steel | |
| 200. |
For turbulent flow (NRe > 2100) of low viscosity fluid (μ > 20cp) in steel pipes, the optimum inside pipe diameter is given by(where, Q = fluid flow rate, ft³/sec.ρ = fluid density, lb/ft³ μ = fluid viscosity, centipoise Di = optimum inside pipe diameter, inches) |
| A. | Di, opt = 3.9 Q0.45 ρ0.13 |
| B. | Di, opt = 3.9 Q0.45 . μ0.95 |
| C. | Di, opt = 4.7 Q0.36 . μ3.2ρ0.13 |
| D. | Di, opt = 3 Q0.36 . μ0.88 |
| Answer» B. Di, opt = 3.9 Q0.45 . μ0.95 | |