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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.
| 1501. |
Narrow coke ovens as compared to wider coke ovens |
| A. | produce smaller coke. |
| B. | produce stronger coke. |
| C. | require less time of carbonisation. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 1502. |
The maximum adiabatic flame temperature is attained, when the fuel is burnt with |
| A. | theoretically required amount of air. |
| B. | more than theoretically required amount of air. |
| C. | less than theoretically required amount of air. |
| D. | theoretically required amount of oxygen. |
| Answer» E. | |
| 1503. |
Grindability index of a coal is 100. It implies that the |
| A. | coal can be pulverised with great difficulty. |
| B. | coal can't be pulverised. |
| C. | coal can be easily pulverised. |
| D. | power consumption in grinding the coal will be very high. |
| Answer» D. power consumption in grinding the coal will be very high. | |
| 1504. |
The cooling medium used in dry quenching of coke is |
| A. | nitrogen |
| B. | air |
| C. | phenolic water |
| D. | carbon dioxide |
| Answer» B. air | |
| 1505. |
A particular coal is said to be free burning when it |
| A. | burns completely. |
| B. | gives smokeless burning. |
| C. | shows little or no fusing action. |
| D. | none of these. |
| Answer» D. none of these. | |
| 1506. |
Gobar gas is produced by the __________ of 'gobar' (cow dung). |
| A. | hydrolysis |
| B. | fermentation |
| C. | oxidation |
| D. | dehydration |
| Answer» C. oxidation | |
| 1507. |
At the boiling point of the liquid at the prevailing pressure, the saturated absolute humidity becomes |
| A. | 1 |
| B. | 0 |
| C. | |
| D. | none of these |
| Answer» D. none of these | |
| 1508. |
Use of natural draft cooling tower is practised, when the air has low |
| A. | humidity |
| B. | temperature |
| C. | both 'a' & 'b' |
| D. | neither 'a' nor 'b' |
| Answer» D. neither 'a' nor 'b' | |
| 1509. |
The cooling effect in a cooling tower can not be increased by |
| A. | increasing the air velocity over the wet surfaces. |
| B. | reducing the humidity of entering air. |
| C. | lowering the barometric pressure. |
| D. | none of these. |
| Answer» E. | |
| 1510. |
The value of NA/(NA + NB) for steady state molecular diffusion of gas 'A' through non-diffusing gas 'B' is |
| A. | 1 |
| B. | |
| C. | 0.5 |
| D. | 2 |
| Answer» B. | |
| 1511. |
When the mixture to be distilled has a very high boiling point and the product material is heat sensitive, the separation technique to be used is __________ distillation. |
| A. | continuous |
| B. | steam |
| C. | azerotropic |
| D. | none of these |
| Answer» C. azerotropic | |
| 1512. |
The apex of an equilateral-triangular coordinate (in ternary liquid system) represents a/an |
| A. | pure component |
| B. | binary mixture |
| C. | ternary mixture |
| D. | insoluble binary system |
| Answer» B. binary mixture | |
| 1513. |
The humid volume may be increased by increasing the |
| A. | temperature at constant humidity. |
| B. | humidity at constant temperature. |
| C. | both (a) and (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 1514. |
A slurry is to be dried to produce flaky solid. Which dryer would you recommend ? |
| A. | Spray dryer |
| B. | Drum dryer |
| C. | Rotary dryer |
| D. | Dielectric dryer |
| Answer» B. Drum dryer | |
| 1515. |
Which of the following psychrometric processes is followed by water vapour laden unsaturated air, when it is passed through solid or liquid adsorbent ? |
| A. | Cooling and dehumidification. |
| B. | Heating and dehumidification at almost constant wet bulb temperature. |
| C. | Dehumidification with dry bulb temperature remaining constant. |
| D. | None of these. |
| Answer» C. Dehumidification with dry bulb temperature remaining constant. | |
| 1516. |
In gas-liquid contact operation, the number of ideal stages, . This is true when the stripping factor 'S' is |
| A. | S > 1 |
| B. | S < 1 |
| C. | S = 1 |
| D. | S = |
| Answer» B. S < 1 | |
| 1517. |
In distillation where q is defined as the moles of liquid flow in the stripping section per mole of feed introduced, for saturated liquid feed |
| A. | q > 1 |
| B. | q < 1 |
| C. | q = 1 |
| D. | q = 0 |
| Answer» D. q = 0 | |
| 1518. |
Dimension of mass diffusivity is the same as that of |
| A. | kinematic viscosity |
| B. | dynamic viscosity |
| C. | surface tension |
| D. | pressure |
| Answer» B. dynamic viscosity | |
| 1519. |
Dorr thickener is an equipment used for |
| A. | classification |
| B. | sedimentation |
| C. | clarification |
| D. | leaching |
| Answer» C. clarification | |
| 1520. |
Steam distillation is used to separate |
| A. | azeotropes. |
| B. | high boiling substances from nonvolatile impurities. |
| C. | heat sensitive materials. |
| D. | mixtures of low relative volatility. |
| Answer» C. heat sensitive materials. | |
| 1521. |
In a binary distillation column, if the feed contains 40 mole % vapour, the q line will have a slope of |
| A. | 1.5 |
| B. | -0.6 |
| C. | -1.5 |
| D. | 0.6 |
| Answer» D. 0.6 | |
| 1522. |
Acetic acid will be most economically separated from a dilute solution of acetic acid in water by |
| A. | solvent extraction |
| B. | continuous distillation |
| C. | evaporation |
| D. | absorption |
| Answer» B. continuous distillation | |
| 1523. |
Design calculation for multiple component distillation is done by |
| A. | Ponchon-Savarit method |
| B. | Mccabe-Thiele method |
| C. | enthalpy concentration method |
| D. | tray to tray calculations. |
| Answer» E. | |
| 1524. |
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 | |
| 1525. |
High amount of sulphur and phosphorous in coke causes |
| A. | decrease in its calorific value. |
| B. | increase in its strength. |
| C. | brittleness of steel made by using it. |
| D. | none of these. |
| Answer» D. none of these. | |
| 1526. |
The difference between total carbon and fixed carbon of coal will be minimum in case of |
| A. | lignite |
| B. | bituminous coal |
| C. | anthracite |
| D. | high temperature coke (V.M < 0.5%) |
| Answer» E. | |
| 1527. |
The maximum percentage of CO2 in a flue gas (from a carbonaceous fuel) can be |
| A. | 21 |
| B. | 77 |
| C. | 79 |
| D. | 29 |
| Answer» B. 77 | |
| 1528. |
The maximum adiabatic flame temperature in air is __________ the maximum flame temperature in pure oxygen. |
| A. | lower than |
| B. | higher than |
| C. | same as |
| D. | not related to |
| Answer» B. higher than | |
| 1529. |
Which of the following gaseous fuels has the highest net calorific value (kcal/Nm3)? |
| A. | Producer gas |
| B. | Carburetted water gas |
| C. | Natural gas |
| D. | Liquified petroleum gas |
| Answer» E. | |
| 1530. |
Which of the following is coking ? |
| A. | Vitrain |
| B. | Fussain |
| C. | both (a) & (b) |
| D. | Neither (a) nor (b) |
| Answer» B. Fussain | |
| 1531. |
Gibbs free energy of a pure fluid approaches __________ as the pressure tends to zero at constant temperature. |
| A. | infinity |
| B. | minus infinity |
| C. | zero |
| D. | none of these |
| Answer» C. zero | |
| 1532. |
Boiling point diagram is |
| A. | not affected by pressure. |
| B. | affected by pressure. |
| C. | a plot of temperature vs. liquid composition. |
| D. | a plot of temperature vs. vapour composition. |
| Answer» C. a plot of temperature vs. liquid composition. | |
| 1533. |
When acetone is added in a two layer mixture of methyl isobutyl ketone and water at 30 C, the acetone distributes between the two layers and the composition of the layer follows two solubility curves. For this system, |
| A. | as the acetone concentration increases, the solubility curves approach each other. |
| B. | both the phases become identical at a particular common point on both the solubility curves called the plait point. |
| C. | the distribution curve which is a plot between x (acetone concentration in one phase) and y (acetone concentration in other phase) is analogous to x-y curve used in distillation and absorption terminates on the x = y diagonal at the concentration of the plait point. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 1534. |
Steam distillation is used to |
| A. | reduce the number of plates. |
| B. | avoid thermal decomposition of a component. |
| C. | increase the efficiency of separation. |
| D. | increase the total pressure of distillation. |
| Answer» C. increase the efficiency of separation. | |
| 1535. |
Freundlich equation applies to the adsorption of solute from |
| A. | dilute solutions, over a small concentration range. |
| B. | gaseous solutions at high pressure. |
| C. | concentrated solutions. |
| D. | none of these. |
| Answer» B. gaseous solutions at high pressure. | |
| 1536. |
For ethanol-water system, the lowering of distillate quality from 95% to 92% will cause __________ plate requirement. |
| A. | no change in theoretical |
| B. | marginal decrease in the number of |
| C. | major decrease in the number of |
| D. | none of these |
| Answer» C. major decrease in the number of | |
| 1537. |
Agitator is provided in a crystalliser for |
| A. | avoiding deposition on cooler surfaces. |
| B. | formation of nuclei. |
| C. | crystal growth. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 1538. |
Only small amount of evaporation of water produces large cooling effects because of its |
| A. | large latent heat |
| B. | low viscosity |
| C. | small latent heat |
| D. | none of these |
| Answer» B. low viscosity | |
| 1539. |
The most common packing used in industrial operations is __________ rings. |
| A. | raschig |
| B. | lessing |
| C. | cross-partition |
| D. | single spiral |
| Answer» B. lessing | |
| 1540. |
When the feed to a distillation column is a saturated liquid, slope of the feed line is |
| A. | zero |
| B. | unity |
| C. | infinity |
| D. | none of these |
| Answer» D. none of these | |
| 1541. |
At equilibrium the concentration of water in vapour phase (C*)in kg/m3 of air space and the amount of water (m) adsorbed per kg of dry silica gel are related by, C* = 0.0667m. To maintain dry conditions in a room of air space 100m3 containing 2.2 kg of water vapour initially, 10 kg of dry silica gel is kept in the room. The fraction of initial water remaining in the air space after a long time (during which the temperature is maintained constant) is |
| A. | 0.0 |
| B. | 0.2 |
| C. | 0.4 |
| D. | 1.0 |
| Answer» D. 1.0 | |
| 1542. |
For the case of flow of air past a wet bulb thermometer (air water vapour system), the approximate value of h2/ky.Cz is around |
| A. | 0.60 |
| B. | 0.24 |
| C. | 1 |
| D. | 0.72 |
| Answer» D. 0.72 | |
| 1543. |
The reciprocal of stripping factor is termed as |
| A. | selectivity index |
| B. | relative volatility |
| C. | absorption factor |
| D. | Murphree efficiency |
| Answer» D. Murphree efficiency | |
| 1544. |
Ponchan-Savarit method analyses the fractional equipment based on |
| A. | enthalpy balance only. |
| B. | material balance only. |
| C. | both enthalpy and material balances. |
| D. | the assumption of constant molaloverflow. |
| Answer» D. the assumption of constant molaloverflow. | |
| 1545. |
Dry bulb temperature of unsaturated air is more than its __________ temperature. |
| A. | dew point |
| B. | wet bulb |
| C. | both 'a' & 'b' |
| D. | neither 'a' nor 'b' |
| Answer» D. neither 'a' nor 'b' | |
| 1546. |
Absorption factor method is used to calculate the number of ideal stages, when |
| A. | operating line lies above the equilibrium line. |
| B. | operating line lies below the equilibrium line. |
| C. | both operating and equilibrium lines are parallel. |
| D. | pressure drop in the column is very high. |
| Answer» D. pressure drop in the column is very high. | |
| 1547. |
As complete saturation of an adsorbent is approached, the differential heat of adsrop-tion approaches |
| A. | that of normal condensation. |
| B. | integral heat of adsorption. |
| C. | zero. |
| D. | none of these. |
| Answer» B. integral heat of adsorption. | |
| 1548. |
'Absorption with chemical reaction' is involved in the removal of |
| A. | carbon dioxide from gaseous stream using alkaline solution. |
| B. | benzol from coke oven gas using solar oil/wash oil. |
| C. | ammonia from coke oven gas using refrigerated water. |
| D. | tar from coke oven gas in primary gas coolers using chilled water. |
| Answer» B. benzol from coke oven gas using solar oil/wash oil. | |
| 1549. |
The-relative volatility for separation of a non-ideal binary mixture by distillation should be |
| A. | 0 |
| B. | 1 |
| C. | > 1 |
| D. | < 1 |
| Answer» D. < 1 | |
| 1550. |
To get high tray efficiency |
| A. | interfacial surface between liquid and gas phase should be large. |
| B. | time of contact between the two phases should be less. |
| C. | gas velocity should be very low. |
| D. | liquid entrainment should be severe. |
| Answer» B. time of contact between the two phases should be less. | |