MCQOPTIONS
Saved Bookmarks
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.
| 3351. |
Which of the following liquid-vapor contacting devices provides maximum contact surface area for a particular duty ? |
| A. | Sieve plate column |
| B. | Bubble cap column |
| C. | Randomly packed column |
| D. | Wetted wall column |
| Answer» E. | |
| 3352. |
The equipment frequently used for adiabatic humidification-cooling operation with recirculating liquid is |
| A. | natural draft cooling tower |
| B. | induced draft cooling tower |
| C. | spray chamber |
| D. | none of these |
| Answer» D. none of these | |
| 3353. |
Chemisorption (chemical adsorption) is |
| A. | same as "Van der Waals" adsorption. |
| B. | characterised by adsorption of heat. |
| C. | an irreversible phenomenon. |
| D. | a reversible phenomenon. |
| Answer» D. a reversible phenomenon. | |
| 3354. |
The rate of solid-liquid extraction is limited by the |
| A. | phase change of the solute as it dissolves in the solvent. |
| B. | diffusion of the solute through the solvent in the pores to the outside of the particle. |
| C. | diffusion of the solute from the solution in contact with the particle to the main bulk of the solution. |
| D. | all 'a', 'b' & 'c'. |
| Answer» E. | |
| 3355. |
Raoult's law applies to the |
| A. | all liquid solutions |
| B. | non-ideal solution only. |
| C. | non-volatile solute. |
| D. | solvents. |
| Answer» E. | |
| 3356. |
Make up water is required in a cooling tower to replace the water lost by |
| A. | evaporation |
| B. | drift |
| C. | blowdown and leakage |
| D. | all (a), (b) and (c) |
| Answer» E. | |
| 3357. |
Which of the following quantities need not be fixed before starting the design of a co-current absorber ? |
| A. | Heat gain or loss |
| B. | Flow rate of entering liquid |
| C. | Flow rate of gas |
| D. | None of these |
| Answer» C. Flow rate of gas | |
| 3358. |
Mass transfer co-efficient of liquid is |
| A. | affected more by temperature than that for gases. |
| B. | affected much less by temperature than that for gases. |
| C. | not affected by the temperature. |
| D. | none of these. |
| Answer» B. affected much less by temperature than that for gases. | |
| 3359. |
Which of the following unit operations makes use of Thiele-Geddes equation ? |
| A. | Liquid-liquid extraction |
| B. | Solid-liquid extraction |
| C. | Multicomponent absorption with chemical reaction |
| D. | Multicomponent distillation. |
| Answer» E. | |
| 3360. |
The rate of material __________ is zero in case of a steady state system. |
| A. | accumulation |
| B. | production |
| C. | input |
| D. | generation |
| Answer» B. production | |
| 3361. |
A metal oxide is reduced by heating it in a stream of hydrogen. After complete reduction, it is found that 3.15 gm of the oxide has yielded 1.05 gm of the metal. It may be inferred that the |
| A. | atomic weight of the metal is 4. |
| B. | equivalent weight of the metal is 4. |
| C. | atomic weight of the metal is 2. |
| D. | equivalent weight of the metal is 8. |
| Answer» C. atomic weight of the metal is 2. | |
| 3362. |
Equal masses of CH4 and H2 are mixed in an empty container. The partial pressure of hydrogen in this container expressed as the fraction of total pressure is |
| A. | 1/9 |
| B. | 8/9 |
| C. | 1/2 |
| D. | 5/9 |
| Answer» C. 1/2 | |
| 3363. |
Molar heat capacity of water in equilibrium with ice at constant pressure is |
| A. | 0 |
| B. | |
| C. | 1 |
| D. | none of these |
| Answer» C. 1 | |
| 3364. |
If pH value of a solution is 8, then its pOH value will be |
| A. | 6 |
| B. | 1 |
| C. | 7 |
| D. | 10 |
| Answer» B. 1 | |
| 3365. |
The chemical nature of an element is independent of |
| A. | its atomic number. |
| B. | the number of protons or electrons present in it. |
| C. | the number of neutrons present in it. |
| D. | none of these. |
| Answer» D. none of these. | |
| 3366. |
The heat change for the reaction, C(s) + 2S(s) CS2(l), is 104.2 kJ. It represents the heat of |
| A. | formation |
| B. | solution |
| C. | combustion |
| D. | fusion |
| Answer» B. solution | |
| 3367. |
A sample of well water contains 140 gm/m3 Ca2+ ions and 345 gm/m3 Na+ ions. The hardness of the sample of water, expressed in terms of equivalent CaCO3 in gm/m3 is (assuming atomic masses of Ca :40, Na : 23, C : 12, O : 16) |
| A. | 350 |
| B. | 485 |
| C. | 140 |
| D. | 345 |
| Answer» B. 485 | |
| 3368. |
A chemical reaction will occur spontaneously at constant pressure and temperature, if the free energy is |
| A. | zero |
| B. | positive |
| C. | negative |
| D. | none of these |
| Answer» D. none of these | |
| 3369. |
Fundamental principle of refrigeration is based on the __________ law of thermodynamics. |
| A. | zeroth |
| B. | first |
| C. | second |
| D. | third |
| Answer» D. third | |
| 3370. |
For a spontaneous process, free energy |
| A. | is zero |
| B. | increases |
| C. | decreases whereas the entropy increases |
| D. | and entropy both decrease |
| Answer» D. and entropy both decrease | |
| 3371. |
Which of the following is not an intensive property ? |
| A. | Chemical potential |
| B. | Surface tension |
| C. | Heat capacity |
| D. | None of these |
| Answer» D. None of these | |
| 3372. |
Out of the following refrigration cycles, which one has the minimum COP (Co-efficient of performance)? |
| A. | Air cycle |
| B. | Carnot cycle |
| C. | Ordinary vapour compression cycle |
| D. | Vapour compression with a reversible expansion engine |
| Answer» B. Carnot cycle | |
| 3373. |
Measurement of thermodynamic property of temperature is facilitated by __________ law of thermodynamics. |
| A. | 1st |
| B. | zeroth |
| C. | 3rd |
| D. | none of these |
| Answer» C. 3rd | |
| 3374. |
Keeping the pressure constant, to double the volume of a given mass of an ideal gas at 27 C, the temperature should be raised to __________ C. |
| A. | 270 |
| B. | 327 |
| C. | 300 |
| D. | 540 |
| Answer» C. 300 | |
| 3375. |
Solutions which distil without change in composition are called |
| A. | ideal |
| B. | saturated |
| C. | supersaturated |
| D. | azeotropic |
| Answer» E. | |
| 3376. |
Gases having same reduced temperatures and reduced pressures |
| A. | deviate from ideal gas behaviour to the same degree. |
| B. | have nearly the same compressibility factor. |
| C. | both (a) and (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 3377. |
Which of the following is not a unit of pressure ? |
| A. | Torr |
| B. | Newton/m |
| C. | <sup>2</sup> |
| D. | Parsec |
| E. | Ata, bar or pascal |
| Answer» D. Parsec | |
| 3378. |
The evaporation of aqueous solution of sugar causes its molarity to |
| A. | decrease. (b) increase. |
| B. | remain unchanged. |
| C. | either (a) or (b); depends on the concentration of the solution. |
| Answer» C. either (a) or (b); depends on the concentration of the solution. | |
| 3379. |
Maximum work that could be secured by expanding the gas over a given pressure range is the __________ work. |
| A. | isothermal |
| B. | adiabatic |
| C. | isentropic |
| D. | none of these |
| Answer» B. adiabatic | |
| 3380. |
Internal energy change of a system over one complete cycle in a cyclic process is |
| A. | zero |
| B. | +ve |
| C. | -ve |
| D. | dependent on the path |
| Answer» B. +ve | |
| 3381. |
Heating of water under atmospheric pressure is an __________ process. |
| A. | isochoric |
| B. | isobaric |
| C. | adiabatic |
| D. | isothermal |
| Answer» C. adiabatic | |
| 3382. |
Sucrose content in the raw juice extracted from sugar cane is about __________ percent. |
| A. | 1 - 2 |
| B. | 15 - 20 |
| C. | 50 - 60 |
| D. | 80 - 85 |
| Answer» C. 50 - 60 | |
| 3383. |
Fusel oil is a/an |
| A. | essential oil. |
| B. | extract from medicinal herbs. |
| C. | mixture of higher molecular weight alcohols (a by-product obtained during production of alcohol from molasses). |
| D. | none of these. |
| Answer» D. none of these. | |
| 3384. |
High __________ is an undesirable property for a good refrigerant. |
| A. | specific heat |
| B. | latent heat of vaporisation |
| C. | viscosity |
| D. | specific vapor volume |
| Answer» D. specific vapor volume | |
| 3385. |
Van Laar equation deals with the activity co-efficients in |
| A. | binary solutions |
| B. | ternary solutions |
| C. | azeotropic mixture only |
| D. | none of these |
| Answer» B. ternary solutions | |
| 3386. |
Sulphur addition in soap is done to |
| A. | improve the soap texture. |
| B. | cure pimples & dandruff. |
| C. | fasten lather formation. |
| D. | increase its cleansing action. |
| Answer» C. fasten lather formation. | |
| 3387. |
Phosphate rock is a raw material for the manufacture of |
| A. | phosphoric acid |
| B. | phosphorous |
| C. | superphosphates |
| D. | all (a), (b) and (c) |
| Answer» E. | |
| 3388. |
Mineral oils (e.g. petroleum oils) are preferred over fatty oils (e.g. mustard oil, ghee, tallow, palm oil, olive oil etc.) as a lubricant due to its |
| A. | poor oxidation stability and high gum forming tendency. |
| B. | greater tendency of decomposition at elevated temperature. |
| C. | hydrolysis tendency in presence of water. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 3389. |
Neoprene is the trade name of |
| A. | polyurathane |
| B. | phenol formaldehyde |
| C. | polychloroprene |
| D. | styrene-butadiene rubber |
| Answer» D. styrene-butadiene rubber | |
| 3390. |
Wood charcoal is used for decolouration of sugar, because it __________ the coloured materials. |
| A. | adsorbs |
| B. | oxidises |
| C. | reduces |
| D. | converts |
| Answer» B. oxidises | |
| 3391. |
Haemoglobin is a/an |
| A. | amino acid |
| B. | biological catalyst |
| C. | protein |
| D. | enezyme |
| Answer» D. enezyme | |
| 3392. |
Hard water |
| A. | does not affect the lather formation by soap. |
| B. | is not unfit for drinking purpose. |
| C. | pollutes the water stream. |
| D. | all (a), (b) and (c). |
| Answer» C. pollutes the water stream. | |
| 3393. |
Epoxy resin |
| A. | is a good adhesive. |
| B. | is an elastomer. |
| C. | cannot be used for surface coatings. |
| D. | is a polyester. |
| Answer» B. is an elastomer. | |
| 3394. |
Which of the following is an organo-metal-lic compound ? |
| A. | Isopropyl alcohol |
| B. | Tetra-ethyl lead |
| C. | Zeolite |
| D. | Cumene |
| Answer» C. Zeolite | |
| 3395. |
Concentration of NaOH solution produced by mercury electrolytic cell is about __________ percent. |
| A. | 10 |
| B. | 25 |
| C. | 50 |
| D. | 98 |
| Answer» D. 98 | |
| 3396. |
Which of the following is the most adverse factor challenging the choice of mercury electrolytic cell process for the production of caustic soda? |
| A. | High cost of mercury. |
| B. | High specific gravity of mercury. |
| C. | Non-availability of high purity mercury. |
| D. | Pollution of water stream by mercury. |
| Answer» E. | |
| 3397. |
Esterification reaction produces |
| A. | detergent |
| B. | vanaspati |
| C. | soap |
| D. | mercaptans |
| Answer» D. mercaptans | |
| 3398. |
Styrene-butadiene-rubber (SBR) as compared to natural rubber has |
| A. | Poorer tensile strength. |
| B. | poorer resistance to oxidation. |
| C. | greater amount of heat build-up under heavy loading. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 3399. |
Co-efficient of thermal expansion of glass is decreased by the addition of __________ during its manufacture. |
| A. | CaO |
| B. | MnO |
| C. | <sub>2</sub> |
| D. | ZnO |
| E. | FeS |
| Answer» D. ZnO | |
| 3400. |
All enzymes are made of |
| A. | fats |
| B. | carbohydrates |
| C. | proteins |
| D. | amino acids |
| Answer» D. amino acids | |