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.
| 1401. |
__________ number is sometimes used in place of Grashoff number in free convection heat transfer. |
| A. | Stanton |
| B. | Brinkman |
| C. | Rayleigh |
| D. | Nusselt |
| Answer» D. Nusselt | |
| 1402. |
Work hardenable alloy steel used to make the bucket wheel excavators, blades of bulldozers and other earth moving equipments contain iron, carbon and |
| A. | manganese |
| B. | silicon |
| C. | nickel |
| D. | chromium |
| Answer» B. silicon | |
| 1403. |
Atomic __________ is a whole number for an element. |
| A. | number |
| B. | weight |
| C. | radius |
| D. | none of these |
| Answer» B. weight | |
| 1404. |
Powder metallurgy is used to produce |
| A. | high precision components with complex cavities and sharp features. |
| B. | components of large size. |
| C. | porosity free components. |
| D. | components of such alloys whose constituents do not form alloys readily. |
| Answer» D. components of such alloys whose constituents do not form alloys readily. | |
| 1405. |
pH value of rain water in India ranges from |
| A. | 5.5 to 7.5 |
| B. | 8 to 9.5 |
| C. | 3.5 to 5 |
| D. | 9.5 to 10.5 |
| Answer» B. 8 to 9.5 | |
| 1406. |
Carbide tipped cutting tools are manufactured by powder metallurgy techniques and have a composition of |
| A. | 90% tungsten carbide and 10% cobalt. |
| B. | 70% aluminium oxide & 30% silica. |
| C. | 30% nickel, 15% chromium & 55% tungsten. |
| D. | 65% tungsten & 35% zirconium. |
| Answer» B. 70% aluminium oxide & 30% silica. | |
| 1407. |
Which of the following will resist maxi-mum shock & vibration without cracking? |
| A. | Grey cast iron |
| B. | White cast iron |
| C. | Malleable iron |
| D. | Graphite |
| Answer» D. Graphite | |
| 1408. |
Malleabilisation heat treatment is performed on |
| A. | cast steel |
| B. | grey cast iron |
| C. | white cast iron |
| D. | spheroidal graphite cast iron |
| Answer» D. spheroidal graphite cast iron | |
| 1409. |
Plastics as a material of construction suffer from the drawback of low |
| A. | machinability |
| B. | density |
| C. | strength |
| D. | plastic deformation |
| Answer» D. plastic deformation | |
| 1410. |
A simple closed grinding circuit may consist of |
| A. | a ball mill and a classifier. |
| B. | a rod mill and a hydrocyclone. |
| C. | a jaw crusher and a hydrocyclone. |
| D. | a ball mill and a froth floatation cell. |
| Answer» B. a rod mill and a hydrocyclone. | |
| 1411. |
Air/fuel ratio by weight for combustion of methane with theoretical quantity of air will be about |
| A. | 0.37569444444444 |
| B. | 0.70902777777778 |
| C. | 0.95902777777778 |
| D. | 1.2090277777778 |
| Answer» C. 0.95902777777778 | |
| 1412. |
A spark ignition petrol engine has |
| A. | throttle valve |
| B. | carburettor |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 1413. |
Number of electrons in the outermost shell of a semi-conductor material is |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» E. | |
| 1414. |
Sudden immersion/dipping of red hot steel bar in water makes it |
| A. | malleable & tough. |
| B. | ductile & soft. |
| C. | brittle & hard. |
| D. | none of these. |
| Answer» D. none of these. | |
| 1415. |
Hypo (sodium thiosulphate) because of its complex forming behaviour is used in photography to remove undecomposed silver bromide as a soluble complex for __________ of the picture. |
| A. | printing |
| B. | developing |
| C. | colour |
| D. | fixation |
| Answer» C. colour | |
| 1416. |
Titanium can be easily welded using __________ welding. |
| A. | submerged arc |
| B. | TIG |
| C. | shielded metal arc |
| D. | electroslag |
| Answer» C. shielded metal arc | |
| 1417. |
Starting friction is low in case of the __________ lubrication. |
| A. | boundary |
| B. | hydrodynamic |
| C. | hydrostatic |
| D. | mixed/semi-fluid |
| Answer» D. mixed/semi-fluid | |
| 1418. |
Plasma is |
| A. | a high temperature neutral gas. |
| B. | nothing but ionised gas. |
| C. | a source of steady and highest controllable pressure. |
| D. | formed at very low temperature. |
| Answer» C. a source of steady and highest controllable pressure. | |
| 1419. |
The majority charge carriers in p-type silicon are |
| A. | free electrons |
| B. | ions |
| C. | conduction electrons |
| D. | holes |
| Answer» E. | |
| 1420. |
Needles are produced by |
| A. | forging |
| B. | swaging |
| C. | extrusion |
| D. | machining |
| Answer» C. extrusion | |
| 1421. |
A metalloid possesses the characteristics of both the metals and non-metals. Which of the following is not a metalloid ? |
| A. | Arsenic |
| B. | Antimony |
| C. | Lead |
| D. | none of these |
| Answer» D. none of these | |
| 1422. |
Materials having resistivity ranging from 1 to 100 ohm. cm is termed as |
| A. | conductor |
| B. | insulator |
| C. | semi-conductor |
| D. | none of these |
| Answer» D. none of these | |
| 1423. |
Rockwell number represents the |
| A. | hardness of a substance. |
| B. | colour of a pigment. |
| C. | density of a polymer. |
| D. | active ingredients in a fertiliser. |
| Answer» B. colour of a pigment. | |
| 1424. |
The most important function of a washer is to provide bearing area and washers are normally specified by their hole diameters. The diameter of washer as compared to the nut is |
| A. | more |
| B. | less |
| C. | same |
| D. | more but less than the diameter of bolt |
| Answer» B. less | |
| 1425. |
Which of the following is an acidic constituent of B.F. slag ? |
| A. | SiO2 |
| B. | FeO |
| C. | MgO |
| D. | CaO |
| Answer» B. FeO | |
| 1426. |
Water hammer in pipelines results, when the flowing fluid |
| A. | has very high velocity. |
| B. | has very high pressure. |
| C. | is brought to rest by gradually closing a valve. |
| D. | is suddenly brought to rest by closing a valve. |
| Answer» E. | |
| 1427. |
Otto cycle used in spark ignition petrol engines is also known as the constant __________ cycle. |
| A. | volume |
| B. | pressure |
| C. | heat |
| D. | none of these |
| Answer» B. pressure | |
| 1428. |
Ultimate strength in tension as compared to that in shear for steel is |
| A. | half |
| B. | one third |
| C. | one and half times |
| D. | one fourth |
| Answer» D. one fourth | |
| 1429. |
The only suitable method for hardening the low carbon steel is case hardening. Which of the following is a case hardening process? |
| A. | Cyaniding |
| B. | Sheardising |
| C. | Spherodising |
| D. | None of these |
| Answer» B. Sheardising | |
| 1430. |
Which of the following does not have a sharp melting point ? |
| A. | Thoria |
| B. | Glass |
| C. | Ice |
| D. | Pig iron |
| Answer» C. Ice | |
| 1431. |
Lap joints are preferred over butt joints in soldering/brazing, because these joints are |
| A. | weaker in tension but stronger in shear. |
| B. | weaker in shear but stronger in tension. |
| C. | stronger in both shear and tension. |
| D. | The lap joints are easily made. |
| Answer» E. | |
| 1432. |
Which one can be directly solidified from gaseous state wihtout entering into liquid state ? |
| A. | Helium |
| B. | Oxygen |
| C. | Carbon dioxide |
| D. | None of these |
| Answer» D. None of these | |
| 1433. |
Surface finish of casting does not depend upon the |
| A. | sand fineness. |
| B. | pattern finish. |
| C. | mould dressings. |
| D. | metal temperature. |
| Answer» E. | |
| 1434. |
Which of the following is not the commercial name of polymethyl-methacrylate (PMMA) ? |
| A. | Styrofoam |
| B. | Lucite |
| C. | Perspex |
| D. | Plexiglass |
| Answer» B. Lucite | |
| 1435. |
Copper is not present as an alloying constituent in |
| A. | silicon bronze |
| B. | constantan |
| C. | nichrome |
| D. | delta metal |
| Answer» D. delta metal | |
| 1436. |
A fine grained grinding wheel should not be used for grinding __________ materials. |
| A. | hard |
| B. | brittle |
| C. | soft & ductile |
| D. | none of these |
| Answer» D. none of these | |
| 1437. |
Dezincification is a form of corrosion, which specifically applies to |
| A. | steel |
| B. | brass |
| C. | stainless steel |
| D. | babbit metal |
| Answer» C. stainless steel | |
| 1438. |
Specific heat of an ideal gas depends upon its |
| A. | molecular weight |
| B. | pressure |
| C. | temperature |
| D. | volume |
| Answer» D. volume | |
| 1439. |
The behaviour of a metal specimen, which when plastically strained in tension reduces its yield stress in compression and vice versa; is termed as the |
| A. | work hardening. |
| B. | Bauschinger effect. |
| C. | creeping effect. |
| D. | stress recovery effect. |
| Answer» C. creeping effect. | |
| 1440. |
A suitable lubricant used for watches is |
| A. | metallic soap solution |
| B. | grease |
| C. | palm oil |
| D. | hazel-nut oil |
| Answer» E. | |
| 1441. |
The most abundant metal present in the earth's crust is; |
| A. | iron |
| B. | copper |
| C. | titanium |
| D. | aluminium |
| Answer» E. | |
| 1442. |
Super conduction in metals is observed at a temperature of __________ °K.$ |
| A. | <100 |
| B. | >100 |
| C. | about 273 |
| D. | about 373 |
| Answer» C. about 273 | |
| 1443. |
For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm3) while the C.V. is same on weight basis (i.e., kcal/kg) ? |
| A. | Propane and acetylene |
| B. | Propane and LPG |
| C. | Sewage gas and gobar gas |
| D. | B.F gas and coke oven gas |
| Answer» E. | |
| 1444. |
Fahrenheit and Centigrade scales have the same readings at |
| A. | -55° |
| B. | -40° |
| C. | -33° |
| D. | -58° |
| Answer» C. -33¬∞ | |
| 1445. |
Fatigue resistance of a material is measured by the |
| A. | elastic limit. |
| B. | ultimate tensile strength. |
| C. | Young's modulus. |
| D. | endurance limit. |
| Answer» E. | |
| 1446. |
Reynolds number of a fluid flowing in a circular pipe is 10000. What will be the Reynolds number when the fluid velocity is decreased by 30% & the pipe diameter is increased by 30% ? |
| A. | 9100 |
| B. | 13000 |
| C. | 7000 |
| D. | 2550 |
| Answer» B. 13000 | |
| 1447. |
Unit of surface tension in S.I. unit is |
| A. | Watt/m |
| B. | Joule/m2 |
| C. | Newton/m2 |
| D. | Joule/m |
| Answer» C. Newton/m2 | |
| 1448. |
The yield point in fatigue loading compared to that in static loading is less. The ratio of ultimate tensile strength to endurance limit of a material subjected to fatigue loading is |
| A. | 0.5 |
| B. | 1 |
| C. | 1.5 |
| D. | 2 |
| Answer» E. | |
| 1449. |
Stellite is a trade name for the |
| A. | cermets. |
| B. | ferrous cast alloys. |
| C. | non-ferrous cast alloys. |
| D. | products made by powder metallurgy techniques. |
| Answer» D. products made by powder metallurgy techniques. | |
| 1450. |
Which of the following is the most wear resistant grade of carbide used for the cutting tools? |
| A. | Aluminium carbide |
| B. | Tungsten carbide |
| C. | Nickel carbide |
| D. | Iron carbide |
| Answer» C. Nickel carbide | |