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.
| 4401. |
When larger particles e.g., grains are subjected to fluidisation, the corresponding bed produced is termed as the __________ bed. |
| A. | spouted |
| B. | sluggish |
| C. | boiling |
| D. | teeter |
| Answer» B. sluggish | |
| 4402. |
In turbulent flow, a rough pipe has the same friction factor as a smooth pipe |
| A. | in the zone of complete turbulence. |
| B. | when the roughness projections are much smaller than the thickness of the laminar film. |
| C. | everywhere in the transition zone. |
| D. | when the friction factor is independent of the Reynold's number. |
| Answer» C. everywhere in the transition zone. | |
| 4403. |
Air vessel provided in a reciprocating pump |
| A. | smoothens the flow by avoiding pulsations. |
| B. | increases the volumetric efficiency of the pump. |
| C. | saves the pump from the danger of cavitation. |
| D. | none of these. |
| Answer» E. | |
| 4404. |
Joule-Thomson experiment is |
| A. | isobaric |
| B. | adiabatic |
| C. | isenthalpic |
| D. | both(b) & (c) |
| Answer» E. | |
| 4405. |
1st law of thermodynamics is nothing but the law of conservation of |
| A. | momentum |
| B. | mass |
| C. | energy |
| D. | none of these |
| Answer» D. none of these | |
| 4406. |
"At the absolute zero temperature, the entropy of every perfectly crystalline substance becomes zero". This follows from the |
| A. | third law of thermodynamics |
| B. | second law of thermodynamics |
| C. | Nernst heat theorem |
| D. | Maxwell's relations |
| Answer» B. second law of thermodynamics | |
| 4407. |
During Joule-Thomson expansion of gases |
| A. | enthalpy remains constant. |
| B. | entropy remains constant. |
| C. | temperature remains constant. |
| D. | none of these. |
| Answer» B. entropy remains constant. | |
| 4408. |
The accentric factor of a materical, ' ', is defined as = -log10(Prsat)Tr-1 = 0.7, where, Prsat = reduced vapor pressure, Tr = reduced temperature. The value of accentric factor is always |
| A. | > 2 |
| B. | < 1 |
| C. | > 1 |
| D. | < 3 |
| Answer» C. > 1 | |
| 4409. |
Degress of freedom at triple point will be |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» B. 1 | |
| 4410. |
Entropy of an ideal gas depends upon its |
| A. | pressure |
| B. | temperature |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 4411. |
Isobaric process means a constant process. |
| A. | temperature |
| B. | pressure |
| C. | volume |
| D. | entropy |
| Answer» C. volume | |
| 4412. |
No work is done by the system, when a reaction occurs at constant |
| A. | volume |
| B. | temperature |
| C. | pressure |
| D. | none of these |
| Answer» B. temperature | |
| 4413. |
The drug used in contraceptives is |
| A. | sulphadizene |
| B. | mestranol |
| C. | methyl salicylate |
| D. | pencillin |
| Answer» C. methyl salicylate | |
| 4414. |
Raw materials used for producing __________ cement does not contain iron oxide. |
| A. | waterproof |
| B. | slag |
| C. | white |
| D. | pozzolan |
| Answer» D. pozzolan | |
| 4415. |
In the Lurgi coal gasifier |
| A. | coking coals cannot be used. |
| B. | low carbon conversion efficiency is achieved. |
| C. | entrainment of solids is higher. |
| D. | large quantity of coal can be processed. |
| Answer» E. | |
| 4416. |
Neon gas is |
| A. | flammable in nature. |
| B. | used in color discharge tube. |
| C. | filled in lamps having tungsten filament. |
| D. | all (a), (b) and (c). |
| Answer» C. filled in lamps having tungsten filament. | |
| 4417. |
__________ process is used for the manufacture of sodium carbonate by ammonia soda process. |
| A. | Ostwald's |
| B. | Bosch |
| C. | Solvay |
| D. | Haber's |
| Answer» D. Haber's | |
| 4418. |
Polycaprolactum is commercially known as |
| A. | nylon-6 |
| B. | nylon-66 |
| C. | dacron |
| D. | rayon |
| Answer» B. nylon-66 | |
| 4419. |
Frasch process is for |
| A. | making oxygen |
| B. | producing helium |
| C. | mining sulphur |
| D. | making nitrogen |
| Answer» D. making nitrogen | |
| 4420. |
Very fine suspended and colloidal impurities are removed from water by a process called |
| A. | sedimentation |
| B. | coagulation |
| C. | disinfection |
| D. | softening |
| Answer» C. disinfection | |
| 4421. |
Pitch (a product of coal tar distillation) is always mixed with creosote oil, when it is to be burnt in a burner, because |
| A. | its calorific value is very less. |
| B. | tar neutralises the residual acids present in pitch. |
| C. | it reduces viscosity and imparts fluidity for its transportation through pipelines at economic pressure drop. |
| D. | all (a), (b) and (c). |
| Answer» D. all (a), (b) and (c). | |
| 4422. |
If the vapour pressure at two temperatures of a solid phase in equilibrium with its liquid phase are known, then the latent heat of fusion can be calculated by the |
| A. | Maxwell's equation |
| B. | Clayperon-Claussius equation |
| C. | Van Laar equation |
| D. | Nernst Heat Theorem |
| Answer» C. Van Laar equation | |
| 4423. |
The freezing point of a liquid decreases when the pressure is increased, if the liquid __________ while freezing. |
| A. | contracts |
| B. | expands |
| C. | does not change in volume |
| D. | either (a), (b) or (c) |
| Answer» B. expands | |
| 4424. |
Triangular pitch tube layout as compared to square pitch in a shell and tube heat exchanger |
| A. | permits the use of less tubes in a given shell diameter. |
| B. | facilitates comparatively easier external cleaning because of large clearance. |
| C. | permits the use of more tubes in a given shell diameter. |
| D. | both (b) and (c). |
| Answer» D. both (b) and (c). | |
| 4425. |
Bracket supports are the most suitable for supporting __________ vessels. |
| A. | thick walled vertical |
| B. | horizontal |
| C. | thin shperical (e.g. Horton sphere) |
| D. | none of these |
| Answer» B. horizontal | |
| 4426. |
A coal containing high amount of volatile matter will have |
| A. | low ignition temperature |
| B. | very little ash content |
| C. | high fusion point of its ash |
| D. | low adiabatic flame temperature |
| Answer» B. very little ash content | |
| 4427. |
Coking time in a commercial high temperature coal carbonisation plant is about __________ hours. |
| A. | 6 |
| B. | 18 |
| C. | 28 |
| D. | 36 |
| Answer» C. 28 | |
| 4428. |
Which of the following has the least calorific value (kcal/Nm3) ? |
| A. | Blast furnace gas |
| B. | Coke oven gas |
| C. | Sewage gas |
| D. | Natural gas |
| Answer» B. Coke oven gas | |
| 4429. |
Commercial production of petrol from coal (as practised in a factory at Sasol in South Africa) is done by the __________ of coal. |
| A. | hydrogenation |
| B. | gasification |
| C. | carbonisation |
| D. | none of these |
| Answer» B. gasification | |
| 4430. |
The combustion reaction, C + O2 = CO2, is |
| A. | exothermic |
| B. | endothermic |
| C. | autocatalytic |
| D. | none of these |
| Answer» B. endothermic | |
| 4431. |
For maximum discharge through a chimney, its height should be |
| A. | 200 meters. |
| B. | infinitely long. |
| C. | more than 105.7 metres. |
| D. | equal to the height of the hot gas column producing draught. |
| Answer» E. | |
| 4432. |
Rate of low temperature oxidation of coal due to bad storage conditions |
| A. | decreases with increase in surface area. |
| B. | does not vary with increase in surface area. |
| C. | is more for low volatile coal compared to high volatile coal. |
| D. | is accelerated by storage in large heaps with small surface to volume ratio. |
| Answer» E. | |
| 4433. |
Low temperature carbonisation of coal produces |
| A. | metallurgical coke |
| B. | soft coke |
| C. | very low calorific value coke oven gas |
| D. | no by-products |
| Answer» C. very low calorific value coke oven gas | |
| 4434. |
Which of the following has the highest theoretical flame temperature ? |
| A. | Blast furnace gas |
| B. | Hydrogen |
| C. | Acetylene |
| D. | Coke oven gas |
| Answer» D. Coke oven gas | |
| 4435. |
Ultimate analysis of coal determines its __________ content. |
| A. | carbon, hydrogen, nitrogen & sulphur. |
| B. | carbon, ash, sulphur & nitrogen. |
| C. | carbon, sulphur, volatile matter & ash. |
| D. | carbon, volatile matter, ash & moisture. |
| Answer» B. carbon, ash, sulphur & nitrogen. | |
| 4436. |
(64-132) rank coal (ASTM) means a coal with 64% |
| A. | fixed carbon and having a heating value around 13, 200 BTU/1b. |
| B. | ash and heating value around 13, 200 BTU/1b. |
| C. | fixed carbon and heating value around 132 BTU/1b. |
| D. | none of these. |
| Answer» B. ash and heating value around 13, 200 BTU/1b. | |
| 4437. |
High sulphur (4-6%) coal in India are found in |
| A. | Assam |
| B. | Andhra Pradesh |
| C. | Bengal |
| D. | Madhya Pradesh |
| Answer» B. Andhra Pradesh | |
| 4438. |
Zeigler process |
| A. | produces high density polyethylene. |
| B. | produces low density polyethylene. |
| C. | uses no catalyst. |
| D. | employs very high pressure. |
| Answer» B. produces low density polyethylene. | |
| 4439. |
In open channel flow in a rectangular channel, the ratio between the critical depth and the initial depth, when a hydraulic jump occurs is |
| A. | 0.5 |
| B. | 0.84 |
| C. | 1.84 |
| D. | 1.25 |
| Answer» D. 1.25 | |
| 4440. |
Radiation heat losses from satisfactorily insulated high pressure boilar may be about __________ percent. |
| A. | 1 |
| B. | 7 |
| C. | 18 |
| D. | 26 |
| Answer» C. 18 | |
| 4441. |
Bernoulli's equation is dependent on the |
| A. | first law of thermodynamics. |
| B. | third law of thermodynamics. |
| C. | law of conservation of momentum. |
| D. | none of these. |
| Answer» E. | |
| 4442. |
In case of an unsaturated vapor-gas mixture, the humid volume increases with increase in the |
| A. | total pressure. |
| B. | absolute humidity at a given temperature. |
| C. | both (a) and (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 4443. |
Rayleigh equation applies to __________ distillation. |
| A. | differential |
| B. | flash |
| C. | equilibrium |
| D. | molecular |
| Answer» B. flash | |
| 4444. |
Which one is radioactive in nature ? |
| A. | Helium |
| B. | Deuterium |
| C. | Heavy hydrogen |
| D. | Tritium |
| Answer» E. | |
| 4445. |
In case of a pipe of constant cross-sectional area, the maximum fluid velocity obtainable is |
| A. | the velocity of sound. |
| B. | dependent on its cross-sectional area. |
| C. | dependent on fluid viscosity. |
| D. | dependent on fluid density. |
| Answer» B. dependent on its cross-sectional area. | |
| 4446. |
With an increase in pressure in gaseous phase chemical reactions, the fractional conversion __________ when the number of moles decreases. |
| A. | increases |
| B. | decreases |
| C. | remains unaffected |
| D. | unpredictable from the data |
| Answer» B. decreases | |
| 4447. |
A gaseous reactant is introduced in a mixed reactor of 3 litres volume at the rate of 1 litre/second. The space time is __________ seconds. |
| A. | 1 |
| B. | 3 |
| C. | 1/3 |
| D. | 32 |
| Answer» C. 1/3 | |
| 4448. |
CaCO3 contains __________ percent of Ca by weight. |
| A. | 40 |
| B. | 48 |
| C. | 96 |
| D. | 12 |
| Answer» B. 48 | |
| 4449. |
In case of a ternery system involving two liquid components and a solute, the ratio of the concentration of the solute in the two phases at equilibrium is called the distribution co-efficient. The distribution co-efficient depends upon the |
| A. | solute concentration |
| B. | temperature |
| C. | both(a) & (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 4450. |
The net heat evolved or absorbed in a chemical process, i.e. total change in the enthalpy of the system is independent of the |
| A. | temperature & pressure. |
| B. | number of intermediate chemical reactions involved. |
| C. | state of aggregation & the state of combination at the beginning & the end of the reaction. |
| D. | none of these. |
| Answer» C. state of aggregation & the state of combination at the beginning & the end of the reaction. | |