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.
| 1251. |
Surface tension is due to the __________ forces. |
| A. | viscous |
| B. | adhesive |
| C. | cohesive |
| D. | difference between adhesive & cohesive |
| Answer» E. | |
| 1252. |
Powder metallurgy technique is used in the production of __________ tools. |
| A. | tungsten carbide |
| B. | high carbon steel |
| C. | high speed steel |
| D. | drilling |
| Answer» B. high carbon steel | |
| 1253. |
Transformer cores are normally made from |
| A. | soft ferrites |
| B. | high purity iron |
| C. | grain oriented Fe-Si alloy |
| D. | Al-Ni-Co alloy |
| Answer» D. Al-Ni-Co alloy | |
| 1254. |
Heat treatment of steel is done mainly to change its |
| A. | mechanical properties. |
| B. | physical properties, |
| C. | chemical composition. |
| D. | all 'a', 'b' & 'c'. |
| Answer» B. physical properties, | |
| 1255. |
Wrought iron is not |
| A. | ductile & resistant to corrosion/rusting. |
| B. | weldable easily. |
| C. | having uniform strength in all directions. |
| D. | having maximum tensile strength along the lines of slag distribution. |
| Answer» D. having maximum tensile strength along the lines of slag distribution. | |
| 1256. |
The maximum stress below which a material can withstand an infinite number of cycle of stress, is termed as the |
| A. | fatigue strength |
| B. | creep strength |
| C. | resilience |
| D. | endurance limit |
| Answer» E. | |
| 1257. |
Vanadium addition to steel improves its |
| A. | high temperature oxidation resistance. |
| B. | fatigue strength. |
| C. | heat treatability by quenching. |
| D. | hardenability. |
| Answer» E. | |
| 1258. |
Drossing is a __________ operation. |
| A. | smelting |
| B. | dressing |
| C. | roasting |
| D. | dressing |
| Answer» D. dressing | |
| 1259. |
Which of the following is an undesirable property of slag produced during the pyrometallurgical method of metal extraction from its ore ? |
| A. | High fusibility & fluidity. |
| B. | High thermal conductivity. |
| C. | Low density. |
| D. | High chemical activity. |
| Answer» C. Low density. | |
| 1260. |
In sheet metal forming, stretcher strains occur in |
| A. | duralumin sheets. |
| B. | low carbon steel sheets. |
| C. | austenitic stainless steel sheets . |
| D. | Ni-base alloy sheets. |
| Answer» B. low carbon steel sheets. | |
| 1261. |
Routing in production, planning & control is concerned with the |
| A. | sequence of operation to be performed. |
| B. | progress of work performed. |
| C. | authorisation of work to be performed. |
| D. | balancing of load on machines. |
| Answer» B. progress of work performed. | |
| 1262. |
Speed of a submarine in deep sea & that of an aeroplane is measured by a/an |
| A. | pitot tube |
| B. | hot wire anemometer |
| C. | rotameter |
| D. | stroboscope |
| Answer» B. hot wire anemometer | |
| 1263. |
Heat transfer by __________ is almost absent in case of fluidised bed drying operation. |
| A. | radiation |
| B. | conduction |
| C. | convection |
| D. | both (b) & (c) |
| Answer» B. conduction | |
| 1264. |
Ageing of steel refers to the |
| A. | degradation of steel by corrosion. |
| B. | failure of steel structure by overstress-ing. |
| C. | return of sharp yield point in temper rolled low carbon sheet after a period of time. |
| D. | decarburisation of steel by overheating. |
| Answer» D. decarburisation of steel by overheating. | |
| 1265. |
Galvanic corrosion |
| A. | occurs in a bimetal couple. |
| B. | occurs in highly stressed metallic parts only. |
| C. | is exemplified by caustic embrittlement of boiler tubes. |
| D. | is also called dezincification. |
| Answer» B. occurs in highly stressed metallic parts only. | |
| 1266. |
Consumable electrodes are used in the __________ welding. |
| A. | gas |
| B. | arc |
| C. | thermit |
| D. | resistance |
| Answer» C. thermit | |
| 1267. |
Which of the following can be manufactured using powder metallurgy techniques? |
| A. | Brake linings |
| B. | Bearings |
| C. | Carbide tool tips |
| D. | All 'a', 'b' and 'c'. |
| Answer» E. | |
| 1268. |
Cupola produces __________ iron.. |
| A. | pig |
| B. | cast |
| C. | wrought |
| D. | carbon free |
| Answer» C. wrought | |
| 1269. |
Which of the following relationships is correct for relating the three elastic constants of an isotropic elastic material (where, E = Young's modulus, G = Modulus of rigidity or shear modulus v = Poisson's ratio) ? |
| A. | E = 2G (1 + v) |
| B. | E = G (1 + v) |
| C. | E = G (1 + v)/2 |
| D. | E = 2G (1 + 2v) |
| Answer» B. E = G (1 + v) | |
| 1270. |
Oxyacetylene reducing flame is used while carrying out welding on |
| A. | alloy steel |
| B. | grey cast iron |
| C. | mild steel |
| D. | high carbon steel |
| Answer» D. high carbon steel | |
| 1271. |
High endurance limit of carburised machine parts is because of the fact that carburisation |
| A. | suppresses any stress concentration produced in the parts. |
| B. | enhances the yield point of the material. |
| C. | introduces a compressive layer on the surface. |
| D. | produces a better surface finish. |
| Answer» D. produces a better surface finish. | |
| 1272. |
The ability of tool steel to resist softening at high temperatures is termed as __________ hardness. |
| A. | red |
| B. | extended |
| C. | super |
| D. | extreme |
| Answer» D. extreme | |
| 1273. |
Percentage of differential pressure lost in a venturimeter with a tapering of 15° may be about$ |
| A. | 1 |
| B. | 10 |
| C. | 25 |
| D. | 50 |
| Answer» C. 25 | |
| 1274. |
Brinell hardness number (BHN) of a material is a number, which has |
| A. | no dimension. |
| B. | unit of length. |
| C. | unity of force/area. |
| D. | unit of force/length. |
| Answer» D. unit of force/length. | |
| 1275. |
Pressure required to increase the density of water by about 1% is __________ atmosphere. |
| A. | 10 |
| B. | 50 |
| C. | 200 |
| D. | 1000 |
| Answer» D. 1000 | |
| 1276. |
Name the safety device used to protect the boiler, when the water level falls below a minimum level. |
| A. | Blow down valve |
| B. | Blow off cock |
| C. | Fusible plug |
| D. | Safety valve |
| Answer» D. Safety valve | |
| 1277. |
New water wells are disinfected with chlorine in the form of |
| A. | sodium chloride |
| B. | sodium hypochlorate |
| C. | bleaching powder |
| D. | aluminium chloride |
| Answer» D. aluminium chloride | |
| 1278. |
When metals are heated to high temperature, their __________ increases in general. |
| A. | atomic vibration |
| B. | creep strength |
| C. | yield stress & ultimate tensile strength |
| D. | toughness & stiffness |
| Answer» B. creep strength | |
| 1279. |
The ratio of the shear stress to the principal stress on a principal plane is |
| A. | 0 |
| B. | 1 |
| C. | 43497 |
| D. | 43525 |
| Answer» B. 1 | |
| 1280. |
Reduction reaction involves the |
| A. | loss of electrons. |
| B. | increase in oxidation number. |
| C. | gain of electrons. |
| D. | addition of oxygen. |
| Answer» D. addition of oxygen. | |
| 1281. |
Acetylene should never be conveyed through __________ pipe, as it forms an unstable compound that dissociates violently at the slightest shock. |
| A. | stainless steel |
| B. | copper |
| C. | aluminium |
| D. | brass |
| Answer» C. aluminium | |
| 1282. |
All radiations falling on a black body are |
| A. | refracted |
| B. | reflected |
| C. | transmitted |
| D. | absorbed |
| Answer» E. | |
| 1283. |
Corrosion is |
| A. | a physical phenomenon. |
| B. | a chemical phenomenon. |
| C. | same as erosion. |
| D. | an uncontrollable phenomenon. |
| Answer» C. same as erosion. | |
| 1284. |
Nickel and __________ are the alloying element added in steel to increase its toughness. |
| A. | molybdenum |
| B. | chromium |
| C. | vanadium |
| D. | silicon |
| Answer» E. | |
| 1285. |
Removal of non-condensables from steam or other vapour is termed as the __________ process. |
| A. | condensation |
| B. | dearation |
| C. | scavanging |
| D. | exhaust |
| Answer» C. scavanging | |
| 1286. |
As per the Indian boiler regulation (IBR), the type of joint preferred for the circumferential joint is the __________ joint. |
| A. | butt |
| B. | lap |
| C. | welded |
| D. | none of these |
| Answer» C. welded | |
| 1287. |
Spherical shape of mercury droplets is due to its |
| A. | high viscosity. |
| B. | low surface tension. |
| C. | high density. |
| D. | high surface tension. |
| Answer» E. | |
| 1288. |
Normal dosage of chlorine in public water supply scheme ranges from __________ ppm. |
| A. | 0.5 to 1 |
| B. | 10 to 15 |
| C. | 300 to 500 |
| D. | 1000 to 1500 |
| Answer» B. 10 to 15 | |
| 1289. |
At absolute zero temperature, for any reaction involving condensed phases |
| A. | Δ G° = 0 , Δ H° = 0 |
| B. | Δ H° = 0 , Δ S° = 0 |
| C. | Δ S° = 0 , Δ E° = 0 |
| D. | Δ S° = 0 , Δ Cp° = 0 |
| Answer» D. Œî S¬∞ = 0 , Œî Cp¬∞ = 0 | |
| 1290. |
A semi-conductor is damaged & behaves like a conductor, on passing a strong electric current through it, because it heats up the crystals & breaks the covalant bonds resulting in __________ electrons. |
| A. | lack of free |
| B. | excess of |
| C. | decrease in |
| D. | none of these |
| Answer» C. decrease in | |
| 1291. |
In case of simple harmonic motion, displacement is proportional to the |
| A. | velocity |
| B. | acceleration |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» C. both (a) & (b) | |
| 1292. |
In case of compression of one kg of air, the work done will be the least, when the value of polytropic index 'n' is |
| A. | 1 |
| B. | 1.4 |
| C. | 1.5 |
| D. | Y = Cp/Cv |
| Answer» B. 1.4 | |
| 1293. |
Pig iron is |
| A. | made from cast iron. |
| B. | made from wrought iron. |
| C. | the one, which comes out of the blast furnace. |
| D. | free from impurities. |
| Answer» D. free from impurities. | |
| 1294. |
Gage pressure within a spherical droplet of a fluid is 'p'. What will be gage pressure within a bubble of the same size & of the same fluid ? |
| A. | p |
| B. | 0.58333333333333 |
| C. | 0.5 p |
| D. | 0.25 p |
| Answer» C. 0.5 p | |
| 1295. |
Basicity [%Cao + %MgO/% SiO2) of the slag in Indian blast furnace is in the range of |
| A. | 0.7-1.0 |
| B. | 1.1-1.4 |
| C. | 1.5 - 1.8 |
| D. | 2.0 - 2.5 |
| Answer» C. 1.5 - 1.8 | |
| 1296. |
A friction lighter is normally used for lighting gas welding torch, because of the reason that |
| A. | its initial cost is very low. |
| B. | duration of spark created is very small. |
| C. | safety of welder is ensured. |
| D. | it is easier to operate & maintain. |
| Answer» D. it is easier to operate & maintain. | |
| 1297. |
Closeness of packing is maximum in case of __________ crystal lattice. |
| A. | face centred |
| B. | simple cubic |
| C. | body centred |
| D. | none of these |
| Answer» B. simple cubic | |
| 1298. |
Creep consideration is the most important in case of the |
| A. | blades of gas turbines. |
| B. | steam engine flywheel. |
| C. | cast iron pipes. |
| D. | cycle chains. |
| Answer» B. steam engine flywheel. | |
| 1299. |
Which of the following terminology is used for the temperature at which new grains are formed in a metal ? |
| A. | Eutectic temperature. |
| B. | Lower critical temperature. |
| C. | Recrystallisation temperature. |
| D. | Upper critical temperature. |
| Answer» D. Upper critical temperature. | |
| 1300. |
The cooling rate required to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours is __________ BTU/hr.$ |
| A. | 100 |
| B. | 200 |
| C. | 1000 |
| D. | 2000 |
| Answer» C. 1000 | |