MCQOPTIONS
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MCQOPTIONS
This section includes 8247 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 2451. |
NSc/NPr is called the |
| A. | psychrometric ratio |
| B. | Lewis number |
| C. | Sherwood number |
| D. | Stantan number |
| Answer» C. Sherwood number | |
| 2452. |
McCabe-Thiele method |
| A. | uses molal units for material and energy balance. |
| B. | uses weight fractions to express liquid and vapour composition. |
| C. | can use any type of units. |
| D. | is more accurate than Ponchan-Savarit method. |
| Answer» B. uses weight fractions to express liquid and vapour composition. | |
| 2453. |
The film penetration model of mass transfer was enunciated by |
| A. | Gilliland |
| B. | Toor and Marchello |
| C. | Stefan |
| D. | Fick |
| Answer» C. Stefan | |
| 2454. |
The most economical range of absorption factor is |
| A. | 0 to 0.5 |
| B. | 0 to 3 |
| C. | 1.25 to 2 |
| D. | 5 to 15 |
| Answer» D. 5 to 15 | |
| 2455. |
Channelling is most severe |
| A. | in towers packed with stacked packing. |
| B. | in towers packed randomly with crushed solids. |
| C. | in dumped packing of regular units. |
| D. | at very high liquid flow rate. |
| Answer» B. in towers packed randomly with crushed solids. | |
| 2456. |
Which of the following assumes constant molal vaporisation and overflow ? |
| A. | McCabe-Thiele method |
| B. | Ponchan-Savarit method |
| C. | Enthalpy concentration method |
| D. | Plate absorption column |
| Answer» B. Ponchan-Savarit method | |
| 2457. |
Absorption factor, for a fixed degree of absorption from a fixed amount of gas should be |
| A. | 1 |
| B. | > 1 |
| C. | < 1 |
| D. | 1 |
| Answer» C. < 1 | |
| 2458. |
Selectivity of the solvent used in solvent extraction should be |
| A. | 1 |
| B. | > 1 |
| C. | < 1 |
| D. | 0 |
| Answer» C. < 1 | |
| 2459. |
Pick out the wrong statement pertaining to leaching. |
| A. | Fine solids can not be leached in a Pachuka tank. |
| B. | Door classifier can be used for leaching of coarse solids. |
| C. | Vegetable seeds can be leached in either of Bollman extractor, Rotocel or Kennedy extractor. |
| D. | Very high temperature is not needed for the leaching of sugar beet. |
| Answer» B. Door classifier can be used for leaching of coarse solids. | |
| 2460. |
Wet bulb and dry bulb temperatures becomes identical at __________ percent saturation curve. |
| A. | 100 |
| B. | 50 |
| C. | 78 |
| D. | none of these |
| Answer» B. 50 | |
| 2461. |
Separation of the isotopes of helium for scientific investigations is done by |
| A. | reverse osmosis |
| B. | thermal diffusion |
| C. | leaching |
| D. | solvent extraction |
| Answer» C. leaching | |
| 2462. |
Experimental determination of __________ is done by wetted wall column method. |
| A. | diffusion co-efficient |
| B. | mass transfer co-efficient |
| C. | NTU |
| D. | none of these |
| Answer» C. NTU | |
| 2463. |
Which of the following is not a continuous leaching equipment ? |
| A. | Pachuka tank |
| B. | Kennedy extractor |
| C. | Bollman extractor |
| D. | Hydrocyclones |
| Answer» B. Kennedy extractor | |
| 2464. |
__________ extractor is used for the concentration of radioactive nuclear waste. |
| A. | Pulsed column |
| B. | Seive plate |
| C. | Mixer-settler |
| D. | Ballman |
| Answer» B. Seive plate | |
| 2465. |
Moisture content of a substance when at equilibrium with a given partial pressure of the vapour is called the __________ moisture. |
| A. | free |
| B. | unbound |
| C. | equilibrium |
| D. | bound |
| Answer» D. bound | |
| 2466. |
All moisture in a non-hygroscopic material is the __________ moisture. |
| A. | free |
| B. | equilibrium |
| C. | unbound |
| D. | bound |
| Answer» D. bound | |
| 2467. |
For a single component absorber, the operating line is straight only when plotted in term of __________ units. |
| A. | partial pressure |
| B. | mole ratio |
| C. | mole fraction |
| D. | none of these |
| Answer» C. mole fraction | |
| 2468. |
In Mcabe-Thiele method, at infinite reflux ratio |
| A. | number of plates is maximum. |
| B. | overhead product is maximum. |
| C. | both the operating lines coincide with the diagram. |
| D. | none of these. |
| Answer» D. none of these. | |
| 2469. |
Leaching rate is independent of the |
| A. | agitation |
| B. | temperature |
| C. | particle size |
| D. | none of these |
| Answer» E. | |
| 2470. |
In case of unsaturated air |
| A. | dew point < wet bulb temperature |
| B. | wet bulb temperature < dry bulb temperature |
| C. | both (a) and (b) |
| D. | neither (a) not (b) |
| Answer» D. neither (a) not (b) | |
| 2471. |
For a binary mixture with low relative volatility, |
| A. | use steam distillation. |
| B. | use molecular distillation. |
| C. | use high pressure distillation. |
| D. | an azeotrope may be formed during distillation. |
| Answer» E. | |
| 2472. |
In a homogeneous solution, the activity co-efficient of a component depends upon the |
| A. | pressure |
| B. | composition |
| C. | temperature |
| D. | all (a), (b) and (c) |
| Answer» E. | |
| 2473. |
Plate efficiency |
| A. | is a function of the mass transfer between liquid and vapour. |
| B. | increases due to foaming. |
| C. | increases due to liquid entrainment. |
| D. | increases due to weeping and dumping of liquid. |
| Answer» B. increases due to foaming. | |
| 2474. |
Absorption accompanied by heat evolution results in |
| A. | increased capacity of the absorber. |
| B. | increase in equilibrium solubility. |
| C. | decrease in equilibrium solubility. |
| D. | none of these. |
| Answer» D. none of these. | |
| 2475. |
Even though bubble cap towers are very effective for humidification operation, they are not used commonly in industries, because of the |
| A. | high evaporation losses of water. |
| B. | high pressure drop of the gas. |
| C. | difficulty in its fabrication. |
| D. | none of these. |
| Answer» C. difficulty in its fabrication. | |
| 2476. |
Which of the following is not a good moderating material ? |
| A. | Concrete |
| B. | Boron |
| C. | 18/8 stainless steel |
| D. | All (a), (b) and (c) |
| Answer» E. | |
| 2477. |
PV = Constant (where, = Cp/Cv) is valid for a/an __________ process. |
| A. | isothermal |
| B. | isentropic |
| C. | isobaric |
| D. | adiabatic |
| Answer» E. | |
| 2478. |
Claude gas liquefaction process employs cooling |
| A. | at constant pressure. |
| B. | by throttling. |
| C. | by expansion in an engine. |
| D. | none of these. |
| Answer» D. none of these. | |
| 2479. |
The equation, Cp - Cv = R, is true for __________ gas. |
| A. | no |
| B. | any real |
| C. | only ideal |
| D. | both (b) and (c) |
| Answer» D. both (b) and (c) | |
| 2480. |
With increase in compression ratio, the efficiency of the otto engine |
| A. | increases |
| B. | decreases |
| C. | remains constant |
| D. | increases linearly |
| Answer» B. decreases | |
| 2481. |
The chemical potential of any constituent of an ideal solution depends on the __________ of the solution. |
| A. | temperature |
| B. | pressure |
| C. | composition |
| D. | all (a), (b) and (c) |
| Answer» E. | |
| 2482. |
Gibbs free energy per mole for a pure substance is equal to the |
| A. | latent heat of vaporisation |
| B. | chemical potential |
| C. | molal boiling point |
| D. | heat capacity |
| Answer» C. molal boiling point | |
| 2483. |
for fully open globe value may be around |
| A. | 10 |
| B. | 25 |
| C. | 75 |
| D. | 300 |
| Answer» E. | |
| 2484. |
Pick out the wrong statement pertaining to the use of valve tray, seive tray and bubble cap trays in continuous distillation column. |
| A. | Bubble cap trays though most expensive are the best in situations, where low vapour rates is to be handled and a positive liquid seal is essential at all flow rates. |
| B. | Murphree efficiency of all the three trays are nearly equal, however the peak efficiency is generally higher for seive and valve trays than the bubble cap. |
| C. | Maintenance cost for valve and seive trays are comparatively more than bubble cap tray due to their relatively complicated construction features. |
| D. | Valve trays have the highest turn down ratio (i.e. the ratio of the highest to the lowest vapour flow rates) and thus provides the maximum flexible operating range. |
| Answer» D. Valve trays have the highest turn down ratio (i.e. the ratio of the highest to the lowest vapour flow rates) and thus provides the maximum flexible operating range. | |
| 2485. |
With increase in the number of shell passes, the value of FT |
| A. | increases |
| B. | decreases |
| C. | remains same |
| D. | remains same, only if the number of tube passes does not change. |
| Answer» B. decreases | |
| 2486. |
Lug support is |
| A. | the most suitable for thick vertical vessel. |
| B. | same as bracket support. |
| C. | provided usually for vessels of much smaller height than skirt supported vessels. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 2487. |
Holes of a sieve tray are arranged in triangular pitch of __________ times the hole diameter. |
| A. | 1.5 to 2 |
| B. | 2.5 to 5 |
| C. | 5 to 10 |
| D. | 10 to 15 |
| Answer» C. 5 to 10 | |
| 2488. |
Fresh water carrying pipelines in chemical industries are coloured with __________ color. |
| A. | sea green |
| B. | brown |
| C. | yellow |
| D. | red |
| Answer» B. brown | |
| 2489. |
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 | |
| 2490. |
The ratio of shear stress to shear strain is called |
| A. | bulk modulus |
| B. | shear modulus |
| C. | modulus of rigidity |
| D. | modulus of elasticity |
| Answer» C. modulus of rigidity | |
| 2491. |
25 per cent cut segmental baffle means that the baffle |
| A. | height is 75% of the I.D. of the shell. |
| B. | height is 25% of the I.D. of the shell. |
| C. | spacing is 75% of its height. |
| D. | width is 25% of its height. |
| Answer» B. height is 25% of the I.D. of the shell. | |
| 2492. |
Liquid/petroleum fuel storage tanks are built underground (as in case of petrol pumps), when the storage capacity is less than __________ kilolitres. |
| A. | 20 |
| B. | 30 |
| C. | 45 |
| D. | 85 |
| Answer» D. 85 | |
| 2493. |
For a fluid flowing in an annulus space, the wetted perimeter for heat transfer and pressure drop are |
| A. | same |
| B. | different |
| C. | never different |
| D. | linearly related |
| Answer» C. never different | |
| 2494. |
An evaporator while concentrating an aqueous solution from 10 to 40% solids evaporates 30000 kg of water. The amount of solids handled by the system in kg is |
| A. | 4000 |
| B. | 9000 |
| C. | 4600 |
| D. | 3000 |
| Answer» B. 9000 | |
| 2495. |
An insulator should have |
| A. | low thermal conductivity. |
| B. | high thermal conductivity. |
| C. | less resistance to heat flow. |
| D. | a porous structure. |
| Answer» B. high thermal conductivity. | |
| 2496. |
In a backward feed multiple effect evaporator |
| A. | feed is introduced in the first effect. |
| B. | feed flows from low pressure to high pressure. |
| C. | no pumps are required between successive effects. |
| D. | none of these. |
| Answer» C. no pumps are required between successive effects. | |
| 2497. |
Viscous & heat sensitive liquids are concentrated in __________ evaporators. |
| A. | open pan |
| B. | long tube |
| C. | agitated film |
| D. | none of these |
| Answer» D. none of these | |
| 2498. |
1 BTU/hr.ft. F is equal to __________ kcal/hr. m. C. |
| A. | 1.49 |
| B. | 1 |
| C. | 4.88 |
| D. | none of these |
| Answer» B. 1 | |
| 2499. |
The ratio of momentum diffusivity to thermal diffusivity is the __________ number. |
| A. | Prandtl |
| B. | Nusselt |
| C. | Stanton |
| D. | Grashoff |
| Answer» B. Nusselt | |
| 2500. |
For a perfectly transparent surface (like gases), the |
| A. | absorptivity = 0 |
| B. | transmissivity = 1 |
| C. | reflectivity = 0 |
| D. | all (a), (b) & (c) |
| Answer» C. reflectivity = 0 | |