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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.
| 2001. |
Uranium Corporation of India Limited (UCIL) engaged in the mining & concentration of uranium ore is located at |
| A. | Alwaye (in Kerala) |
| B. | Jadugoda (in Jharkhand) |
| C. | Kalpakkam (in Tamilnadu) |
| D. | Gopalpur coast (in Orissa) |
| Answer» C. Kalpakkam (in Tamilnadu) | |
| 2002. |
Number of secondary neutron emitted on fission of an atom of U-235 by slow neutron bombardment is |
| A. | 3 |
| B. | 235 |
| C. | 200 |
| D. | 92 |
| Answer» B. 235 | |
| 2003. |
Plutonium |
| A. | is recovered from spent fuel from thermal nuclear reactor. |
| B. | has much lower melting point (640 C ) compared to thorium (1690 C). |
| C. | both (a) and (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 2004. |
A control rod |
| A. | should have small absorption cross-section. |
| B. | is generally made of boron, hafnium or cadmium. |
| C. | should have large absorption cross-section. |
| D. | both (b) and (c). |
| Answer» E. | |
| 2005. |
Enriched uranium means that, it contains |
| A. | more than 0.71% of U-235. |
| B. | only fertile material. |
| C. | only fissile material. |
| D. | no impurities. |
| Answer» B. only fertile material. | |
| 2006. |
The radioisotope used to study the thyroid gland is |
| A. | iodine |
| B. | cobalt |
| C. | iron |
| D. | carbon |
| Answer» B. cobalt | |
| 2007. |
Heavy water plant is not located at |
| A. | Talcher |
| B. | Tuticorin |
| C. | Ramagundam |
| D. | Kota |
| Answer» D. Kota | |
| 2008. |
Nuclear fuel usually used in a Boiling Water Reactor (BWR) is |
| A. | plutonium |
| B. | enriched uranium |
| C. | natural uranium |
| D. | thorium |
| Answer» C. natural uranium | |
| 2009. |
The new nucleus formed after -decay of a radioactive element has |
| A. | less atomic number |
| B. | less atomic weight |
| C. | more atomic number |
| D. | more atomic weight |
| Answer» B. less atomic weight | |
| 2010. |
Energy produced in the nuclear fission is of the order of __________ MeV. |
| A. | 20 |
| B. | 200 |
| C. | 1000 |
| D. | 2000 |
| Answer» C. 1000 | |
| 2011. |
The term "approach" in a cooling tower refers to the difference in the temperature of the |
| A. | cold water leaving the tower and the wet bulb temperature of the surrounding air. |
| B. | hot water entering the tower and the wet bulb temperature of the surrounding air. |
| C. | hot water entering and the cooled water leaving the cooling tower. |
| D. | none of these |
| Answer» B. hot water entering the tower and the wet bulb temperature of the surrounding air. | |
| 2012. |
Binary distillation involves the mass transfer by __________ at the gas-liquid interface. |
| A. | unidirectional diffusion from liquid to gas phase |
| B. | unidirectional diffusion from gas to liquid phase |
| C. | either 'a' or 'b' |
| D. | a counter diffusion at an almost equal molar rate |
| Answer» E. | |
| 2013. |
The relative humidity of air decreases in-spite of an increase in the absolute humidity, when the |
| A. | temperature rises. |
| B. | pressure rises. |
| C. | temperature falls. |
| D. | pressure falls. |
| Answer» B. pressure rises. | |
| 2014. |
The 'shanks system' of leaching (i.e., counter-current multiple contact leaching) is used for |
| A. | recovery of tannis from the tree barks and woods. |
| B. | leaching sodium nitrate from Chilean nitrate bearing rock. |
| C. | both (a) and (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 2015. |
Penetration model (theory) for mass transfer was enunciated by |
| A. | Danckwerts |
| B. | Toor and Marchello |
| C. | Higbie |
| D. | Kissinevskii |
| Answer» D. Kissinevskii | |
| 2016. |
Surface renewal model of mass transfer was enunciated by |
| A. | Toor and Marchello |
| B. | Fick |
| C. | Danckwerts |
| D. | Stefan |
| Answer» D. Stefan | |
| 2017. |
The relative saturation of an unsaturated mixture of gas and vapor is independent of the |
| A. | nature of the vapor. |
| B. | temperature of the mixture. |
| C. | composition of the mixture. |
| D. | none of these. |
| Answer» E. | |
| 2018. |
When the __________ the relative humidity of air decreases, despite an increase in the absolute humidity. |
| A. | temperature rises |
| B. | pressure rises |
| C. | temperature falls |
| D. | pressure falls |
| Answer» B. pressure rises | |
| 2019. |
Nitrobenzene (boiling point = 210.6 C) is steam distilled at 1 atm pressure.Nitrobenzene will distill off __________ C. |
| A. | at < 100 |
| B. | at > 210.6 |
| C. | between 100 and 210 |
| D. | none of these |
| Answer» B. at > 210.6 | |
| 2020. |
With increase in the concentration of the adsorbate, the integral heat of adsorption |
| A. | increases. |
| B. | decreases. |
| C. | remains unchanged. |
| D. | may increase or decrease ; depends on the type of adsorbate. |
| Answer» C. remains unchanged. | |
| 2021. |
The adiabatic saturation curve for a vapour-gas mixture is |
| A. | straight line. |
| B. | slightly concave upward. |
| C. | slightly concave downward. |
| D. | none of these. |
| Answer» C. slightly concave downward. | |
| 2022. |
The value of NA/(NA + NB), for steady state equimolal counter diffusion of two gases 'A' and 'B' is |
| A. | 1 |
| B. | |
| C. | 0.5 |
| D. | 2 |
| Answer» C. 0.5 | |
| 2023. |
Drift in a cooling tower is |
| A. | the water entrained by the circulating air. |
| B. | dependent on the water lost by evaporation. |
| C. | desirable. |
| D. | all (a), (b) & (c). |
| Answer» B. dependent on the water lost by evaporation. | |
| 2024. |
An alkaline solution is used to reduce the concentration of carbon dioxide in a stream from 10% to 0.1% by absorption with irreversible chemical reaction. The overall number of transfer units based on gas phase is |
| A. | 9.21 |
| B. | 4.605 |
| C. | 100 |
| D. | 0.001 |
| Answer» C. 100 | |
| 2025. |
HETP is numerically equal to HTU, only when the operating line |
| A. | lies below the equilibrium line. |
| B. | lies above the equilibrium line. |
| C. | and equilibrium lines are parallel. |
| D. | is far from the equilibrium line. |
| Answer» D. is far from the equilibrium line. | |
| 2026. |
In a distillation operation, what is the effect of the temperature of the reflux stream (given below) on the condenser and reboiler loads ?Reflux conditions:(i) Reflux stream is completely liquid and is at its bubble point. (ii) Reflux stream is below its bubble point. |
| A. | Condenser and reboiler loads are the same in both the cases. |
| B. | Reboiler load is the same in both the cases but condenser load is higher in case (ii). |
| C. | Condenser load is the same in both the cases but reboiler load is higher in case (ii). |
| D. | Both condensor and reboiler loads are higher in case (ii) as compared to case (i). |
| Answer» E. | |
| 2027. |
Steady state equimolal counter diffusion occurs in case of |
| A. | leaching |
| B. | absorption |
| C. | binary phase distillation |
| D. | liquid-liquid extraction |
| Answer» D. liquid-liquid extraction | |
| 2028. |
In the absorption of ammonia in water, the main resistance to absorption is by the __________ phase. |
| A. | liquid |
| B. | gas |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» C. both (a) & (b) | |
| 2029. |
Drying of refractory is normally carried out in a __________ dryer. |
| A. | open pan |
| B. | tray |
| C. | rotary vacuum |
| D. | truck/tunnel. |
| Answer» E. | |
| 2030. |
When the solvent dissolves very little of solute, then |
| A. | solvent of low latent heat of vaporisation should be used. |
| B. | solvent of low freezing point should be used. |
| C. | large quantity of solvent is required to extract the solute. |
| D. | very small quantity of solvent is required. |
| Answer» D. very small quantity of solvent is required. | |
| 2031. |
At __________ reflux, theoretical number of plates in a distillation coloumn is calculated using Fenske-Underwood equation. |
| A. | operating |
| B. | total |
| C. | minimum |
| D. | maximum permissible |
| Answer» C. minimum | |
| 2032. |
Equilibrium-moisture curves of different solids |
| A. | are different |
| B. | are same |
| C. | depend on the humidity of the gas |
| D. | none of these |
| Answer» B. are same | |
| 2033. |
Heat sensitive materials with very high latent heat of vaporisation may be economically separated using |
| A. | liquid extraction |
| B. | distillation |
| C. | evaporation |
| D. | absorption |
| Answer» B. distillation | |
| 2034. |
For a fixed number of ideal stages in a distillation column, as the reflux ratio is increased, the difference in composition between the top and bottom product streams |
| A. | increases |
| B. | decreases |
| C. | remains unaffected |
| D. | passes through a maximum |
| Answer» B. decreases | |
| 2035. |
A pure drug is administered as a sphere and as a cube. The amount of drug is the same in the two tablets. Assuming that the shape and size do not influence the mass transfer, the ratio of rate of dissolution in water at t = 0 for the cubic to spherical tablet is |
| A. | 0.54 |
| B. | 1.04 |
| C. | 1.24 |
| D. | 1.94 |
| Answer» D. 1.94 | |
| 2036. |
Minimum reflux ratio in a distillation column results in |
| A. | optimum number of trays. |
| B. | minimum reboiler size. |
| C. | maximum condenser size. |
| D. | minimum number of trays. |
| Answer» D. minimum number of trays. | |
| 2037. |
__________ is concerned with the adsorption equilibria. |
| A. | Fick's law |
| B. | Gibb's equation |
| C. | Freundlich equation |
| D. | none of these |
| Answer» D. none of these | |
| 2038. |
Flooding in a distillation column is detected by a sharp |
| A. | increase in Murphree plate efficiency. |
| B. | decrease in pressure drop. |
| C. | decrease in liquid hold up in the coloumn. |
| D. | increase in pressure drop. |
| Answer» E. | |
| 2039. |
Raschig ring made of procelain cannot be used for treating concentrated |
| A. | hydrochloric acid |
| B. | nitric acid |
| C. | alkalis |
| D. | sulphuric acid |
| Answer» D. sulphuric acid | |
| 2040. |
Which of the following is the correct ternery diagram for liquid-liquid extraction system comprising of one pair partly soluble (e.g. water-benzene-acetic acid in which A-diluent, B - solvent and C - solute)? |
| A. | <img src="/_files/images/chemical-engineering/mass-transfer/317-498-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/mass-transfer/317-498-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/mass-transfer/317-498-3.png"> |
| D. | <img src="/_files/images/chemical-engineering/mass-transfer/317-498-4.png"> |
| Answer» B. <img src="/_files/images/chemical-engineering/mass-transfer/317-498-2.png"> | |
| 2041. |
Fractional solvent extraction |
| A. | employs only one solvent |
| B. | employs two solvents |
| C. | results in low interfacial tension |
| D. | none of these |
| Answer» C. results in low interfacial tension | |
| 2042. |
In the layout plan for a vacuum distillation unit, operating at 60 mm Hg, supported by a barometric condenser, the appropriate place for the location of vacuum drum for collecting the distillate will be |
| A. | at ground level. |
| B. | 2 metres above the ground. |
| C. | 5 metres above ground. |
| D. | 10 metres above ground. |
| Answer» B. 2 metres above the ground. | |
| 2043. |
Molecular distillation is |
| A. | high temperature distillation |
| B. | for heat-sensitive materials |
| C. | very low pressure distillation |
| D. | both (b) and (c) |
| Answer» E. | |
| 2044. |
Drying of a wet solid under constant drying conditions means the exposure of the wet solid to the air of constant |
| A. | humidity |
| B. | velocity |
| C. | temperature |
| D. | all (a), (b) & (c) |
| Answer» E. | |
| 2045. |
At 750 K and 1 atm, the approximate value of Schmidt number for air is |
| A. | 0.01 |
| B. | 0.1 |
| C. | 1 |
| D. | 10 |
| Answer» C. 1 | |
| 2046. |
Calculation of mass transfer co-efficient is mostly/normally done using __________ theory. |
| A. | surface renewal |
| B. | film |
| C. | penetration |
| D. | none of these. |
| Answer» C. penetration | |
| 2047. |
For the gas absorption, the height of a transfer unit, based on the gas phase is given by (G: superficial molar gas velocity, L: superficial molar liquid velocity, FG:mass transfer co-efficient, mols/m2 , a: in-terfacial area per unit volume of tower) |
| A. | <img src="/_files/images/chemical-engineering/mass-transfer/329-627-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/mass-transfer/329-627-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/mass-transfer/329-627-3.png"> |
| D. | <img src="/_files/images/chemical-engineering/mass-transfer/329-627-4.png"> |
| Answer» B. <img src="/_files/images/chemical-engineering/mass-transfer/329-627-2.png"> | |
| 2048. |
Which of the following is used for the concentration of rubber latex ? |
| A. | Agitated film evaporator |
| B. | Long tube vertical evaporator |
| C. | Short tube evaporator |
| D. | Calendria |
| Answer» B. Long tube vertical evaporator | |
| 2049. |
Desulphurisation of petrol is done in a |
| A. | Bollman extractor |
| B. | rotating disc extractor |
| C. | packed extraction column |
| D. | plate type extraction column |
| Answer» C. packed extraction column | |
| 2050. |
Chemisorption compared to physical absorption has |
| A. | lower adsorption rate. |
| B. | lower capacity of the solvent for the solute gas. |
| C. | increased utilisation of stagnant zones of the liquid phase. |
| D. | none of these. |
| Answer» D. none of these. | |