MCQOPTIONS
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MCQOPTIONS
This section includes 2253 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1351. |
The atmospheric temperature during melting of ice/snow (in the atmosphere) |
| A. | decreases |
| B. | increases |
| C. | remains same |
| D. | may increase or decrease ; depends on the altitude where snow melts |
| Answer» B. increases | |
| 1352. |
The following is a typical anionic collector used in flotation. |
| A. | Ethyl dixanthogen. |
| B. | Trimethyl cetyl ammonium bromide. |
| C. | Potassium ethyl xanthate. |
| D. | lAuryl amine hydrochloride. |
| Answer» D. lAuryl amine hydrochloride. | |
| 1353. |
Screws are specified by their __________ diameters. |
| A. | minor |
| B. | major |
| C. | pitch |
| D. | none of these |
| Answer» C. pitch | |
| 1354. |
Which of the following is not used as a fuel in rocket propellaht ? |
| A. | Liquid hydrogen |
| B. | Liquid oxygen |
| C. | Liquid hydrazine |
| D. | Kerosene oil |
| Answer» C. Liquid hydrazine | |
| 1355. |
__________ of austenite decreases the hardenability in steel. |
| A. | Fine grains |
| B. | Coarse grains |
| C. | Homogeneity |
| D. | Dissolved elements (except cobalt) |
| Answer» E. | |
| 1356. |
What is the effect on the performance of the economiser in the thermal power plant boiler, if the feed water temperature is very low due to preheaters being out for repairs or starving of steam supply ? |
| A. | It results in corrosion due to the condensation on the flue gas side of the economiser tubes due to handling of low temperature water. |
| B. | Economiser tube life increases due to handling of low temperature water. |
| C. | Heat transfer efficiency of economiser increases due to picking up high heat from the flue gases. |
| D. | Scale formation rate on economiser tubes increases. |
| Answer» B. Economiser tube life increases due to handling of low temperature water. | |
| 1357. |
The materials which fracture even at small strains are termed as brittle, while those materials which exhibit an appreciable deformation before failure are termed as |
| A. | rigid |
| B. | tough |
| C. | ductile |
| D. | plastic |
| Answer» D. plastic | |
| 1358. |
The basic function of the drum in a boiler is to |
| A. | act as a storage for feed water. |
| B. | act as a storage for steam. |
| C. | separate steam from water. |
| D. | remove settling impurities from steam. |
| Answer» D. remove settling impurities from steam. | |
| 1359. |
The main function of the deaerator used in the thermal power plant is to |
| A. | throttle down the steam pressure. |
| B. | enhance feed water temperature. |
| C. | remove dissolved gases from feed-water. |
| D. | remove non-condensable gases from condenser. |
| Answer» D. remove non-condensable gases from condenser. | |
| 1360. |
The yield point phenomenon observed in annealed low carbon steel is due to the presence of the following element. |
| A. | Silicon |
| B. | Carbon |
| C. | Phosphorous |
| D. | Chromium |
| Answer» C. Phosphorous | |
| 1361. |
Alloys having more than 80% copper are generally more |
| A. | abrasion resistant. |
| B. | corrosion resistant. |
| C. | prone to season cracking. |
| D. | machinable. |
| Answer» C. prone to season cracking. | |
| 1362. |
The wet bulb temperature is lower in dry air than in wet air at the same temperature. A dry bulb thermometer registers a higher temperature than a wet bulb thermometer except at __________ percent relative humidity. |
| A. | 0 |
| B. | 100 |
| C. | 50 |
| D. | none of these |
| Answer» C. 50 | |
| 1363. |
The heat of neutralisation remains constant, when there is a reaction between dilute solutions of strong |
| A. | base and strong acid. |
| B. | base and weak acid. |
| C. | acid and weak base. |
| D. | none of these. |
| Answer» B. base and weak acid. | |
| 1364. |
Lithium is a useful alloying addition to aluminium, because it |
| A. | is cheap. |
| B. | imparts solid solution strengthening. |
| C. | lowers density and contributes to age hardening. |
| D. | improves the corrosion resistance of aluminium. |
| Answer» E. | |
| 1365. |
Fine grained steels have |
| A. | high brittleness |
| B. | higher tendency to distort |
| C. | high ductility |
| D. | none of these |
| Answer» D. none of these | |
| 1366. |
Which of the following metals occurs in nature in their free metallic state ? |
| A. | Au & Ag |
| B. | Pb & Zn |
| C. | Cu & Ni |
| D. | none of these |
| Answer» E. | |
| 1367. |
The path and movements followed by men, materials & equipments in executing the activities is indicated by the |
| A. | travel charts |
| B. | man-machine charts |
| C. | string diagram |
| D. | flow diagram |
| Answer» E. | |
| 1368. |
Insulation of liquid surface can be achieved by __________ on top of its surface. |
| A. | floating hollow polypropylene spheres |
| B. | spraying alumina powder |
| C. | putting cement |
| D. | none of these |
| Answer» B. spraying alumina powder | |
| 1369. |
The factor of safety for brittle materials (having elongation < 5%) is based on the __________ stress. |
| A. | yield |
| B. | proof |
| C. | ultimate |
| D. | none of these |
| Answer» D. none of these | |
| 1370. |
Which of the following metals can not be hot worked at room temperature ? |
| A. | Zinc |
| B. | Nickel |
| C. | Lead |
| D. | Tin |
| Answer» C. Lead | |
| 1371. |
Which of the following is an ore dressing operation ? |
| A. | Classification |
| B. | Smelting |
| C. | Roasting |
| D. | None of these |
| Answer» B. Smelting | |
| 1372. |
Which of the following relatively employs the highest heat transfer surface area in a high pressure boiler ? |
| A. | Airpreheater |
| B. | Economiser |
| C. | Steam superheater |
| D. | Furnace water wall |
| Answer» B. Economiser | |
| 1373. |
An ideal material for making cooking vessels should have |
| A. | high heat capacity. |
| B. | low heat capacity. |
| C. | high thermal conductivity. |
| D. | both (b) and (c). |
| Answer» E. | |
| 1374. |
Deformation band is absent in materials having __________ lattice crystal structure. |
| A. | fcc |
| B. | bcc |
| C. | hcp |
| D. | none of these |
| Answer» D. none of these | |
| 1375. |
When the wet steam is throttled but still remains wet at the exit of the throttle valve, then its temperature & dryness fraction respectively |
| A. | decreases & increases. |
| B. | increases & increases. |
| C. | increases & decreases. |
| D. | decreases & decreases. |
| Answer» B. increases & increases. | |
| 1376. |
Nitrogen compounds are not used in the manufacture of |
| A. | fertilisers |
| B. | gun powder |
| C. | tip of match sticks |
| D. | explosive |
| Answer» D. explosive | |
| 1377. |
Blow off cock is provided in steam boiler to |
| A. | guard the boiler in case of abnormal rise in steam pressure. |
| B. | drain out water and sludge during its repair. |
| C. | regulate the supply of water in boiler. |
| D. | put out the fire in the furnace when the water level in the boiler falls to unsafe limit. |
| Answer» C. regulate the supply of water in boiler. | |
| 1378. |
Neutrons are present in all atoms except that of |
| A. | He |
| B. | C |
| C. | H |
| D. | Ar |
| Answer» D. Ar | |
| 1379. |
Disposable patterns are made of |
| A. | metal |
| B. | polystyrene |
| C. | rubber |
| D. | wood |
| Answer» C. rubber | |
| 1380. |
The standard instrument used for calibrating the load applied by universal testing machine is called |
| A. | extensometer |
| B. | spring balace |
| C. | dynamometer |
| D. | none of these |
| Answer» E. | |
| 1381. |
The following is employed as sacrificial anode to provide cathodic protection to ships, pipelines and storage tanks. |
| A. | Iron |
| B. | Copper |
| C. | Nickel |
| D. | Magnesium |
| Answer» E. | |
| 1382. |
__________ is the hardest material out of the following. |
| A. | Boron carbide |
| B. | Tungsten carbide |
| C. | Hardened steel |
| D. | Silicon carbide |
| Answer» B. Tungsten carbide | |
| 1383. |
Hot & cold working of material causes its __________ deformation. |
| A. | visco-elastic |
| B. | isotropic |
| C. | elastic |
| D. | plastic |
| Answer» E. | |
| 1384. |
Carbon is present in the form of __________ in grey cast iron. |
| A. | spheroids |
| B. | nodular aggregates of graphite |
| C. | flakes |
| D. | cementite |
| Answer» D. cementite | |
| 1385. |
Which of the following processes follows the hardening process for reducing the hardening strains & increasing the toughness of the steel part? |
| A. | Anodising |
| B. | Tempering |
| C. | Carburising |
| D. | Annealing |
| Answer» C. Carburising | |
| 1386. |
Babbit lining is used on brass/bronze bearings to increase the |
| A. | antifriction properties. |
| B. | compressive strength. |
| C. | bearing resistance. |
| D. | wear resistance. |
| Answer» E. | |
| 1387. |
Austempering process results in the formation of __________ structure. |
| A. | martensitic |
| B. | bainitic |
| C. | carburised |
| D. | stressed |
| Answer» C. carburised | |
| 1388. |
Titanium is produced by __________ of Ti Cl4. |
| A. | electrolytic reduction |
| B. | calcium reduction |
| C. | magnesium reduction |
| D. | thermal dissociation |
| Answer» D. thermal dissociation | |
| 1389. |
In radiative heat transfer, a grey surface is the one, which has |
| A. | emissivity independent of wavelength. |
| B. | grey appearance to the eye. |
| C. | zero reflectivity. |
| D. | equal brightness in all directions. |
| Answer» B. grey appearance to the eye. | |
| 1390. |
Compression ratio of an I.C. engine is the ratio of the |
| A. | clearance volume to the volume swept by piston per stroke. |
| B. | volume of air in cylinder before compression to that after compression. |
| C. | pressure after compression to that before compression. |
| D. | none of these |
| Answer» C. pressure after compression to that before compression. | |
| 1391. |
The activity co-efficient of the solute in a dilute solution |
| A. | decreases with the increase of concentration of the solute. |
| B. | increases with the increase of concentration of the solute. |
| C. | remains constant. |
| D. | is unity at infinite dilution. |
| Answer» D. is unity at infinite dilution. | |
| 1392. |
The conventional mechnical transducer, which converts pressure signal to displacement signal is |
| A. | spring |
| B. | manometer |
| C. | strain gauge |
| D. | none of these |
| Answer» C. strain gauge | |
| 1393. |
Unit of viscosity in CGS system is |
| A. | gm .cm-1 sec-1 |
| B. | gm . cm2 . sec-2 |
| C. | gm .cm-2, sec-1 |
| D. | gm . cm . sec-1 |
| Answer» B. gm . cm2 . sec-2 | |
| 1394. |
Material of construction of surveying metallic tapes is __________ which has low coefficient of expansion & enough strength. |
| A. | constantan |
| B. | invar |
| C. | pewter metal |
| D. | monel metal |
| Answer» C. pewter metal | |
| 1395. |
Hardening of steel is not possible, unless it is heated __________ critical point. |
| A. | above the highest |
| B. | above the lowest |
| C. | between the first & second |
| D. | between the second & third |
| Answer» C. between the first & second | |
| 1396. |
Steel produced from phosphatic iron is __________ in nature. |
| A. | malleable |
| B. | ductile |
| C. | brittle |
| D. | tough |
| Answer» D. tough | |
| 1397. |
Internal cracks in drawn bars are due to |
| A. | secondary tensile stresses. |
| B. | temperature gradient in the work piece. |
| C. | heated dies and grips. |
| D. | internal compressive residual stress. |
| Answer» B. temperature gradient in the work piece. | |
| 1398. |
Presence of small quantity of sulphur in low carbon steel improves its |
| A. | formability |
| B. | machinability |
| C. | weldability |
| D. | hardenarality |
| Answer» C. weldability | |
| 1399. |
In age-hardenable alloys, maximum ductility is obtained |
| A. | in as cast state. |
| B. | immediately after solution treatment and subsequent quenching. |
| C. | after optimum ageing. |
| D. | after overageing. |
| Answer» D. after overageing. | |
| 1400. |
The ratio of coil diameter to wire diameter of a spring is called the spring |
| A. | index |
| B. | deflection |
| C. | form co-efficient |
| D. | none of these |
| Answer» B. deflection | |