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.
| 451. |
Which of the following is not a naturally occurring nuclear fuel ? |
| A. | Uranium-238 |
| B. | Thorium-233 |
| C. | Plutonium-239 |
| D. | None of these |
| Answer» D. None of these | |
| 452. |
An electron has a mass that is approximately __________ that of the proton. |
| A. | 1836 (approximately) |
| B. | 1/1836 (approximately) |
| C. | 1 |
| D. | |
| Answer» C. 1 | |
| 453. |
Zircon refractories have |
| A. | low co-efficient of expansion. |
| B. | high RUL (1600 C) and refractoriness (> 2000 C). |
| C. | high spalling resistance. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 454. |
Carbon refractory blocks |
| A. | are wetted by molten iron. |
| B. | are used in the hearth of blast furnace. |
| C. | are acidic in nature. |
| D. | all (a), (b) and (c). |
| Answer» C. are acidic in nature. | |
| 455. |
Cold crushing strength of ordinary fireclay brick is about 950 kg/cm2 . On exposure to a temperature of about 1500 C, its crushing strength may come down to as low as __________ kg/cm2 . |
| A. | 450 |
| B. | 250 |
| C. | 150 |
| D. | 65 |
| Answer» E. | |
| 456. |
Zirconia refractory |
| A. | does not react with basic slags. |
| B. | is produced from baddeleyite. |
| C. | can not be used as an insulator. |
| D. | has poor electrical conductivity at high temperature. |
| Answer» C. can not be used as an insulator. | |
| 457. |
Which of the following consumes the maximum tonnage of refractories annually in an integrated steel plant ? |
| A. | Soaking pits |
| B. | Ceheating furnace |
| C. | L.D. converter |
| D. | Rotary lime kiln |
| Answer» D. Rotary lime kiln | |
| 458. |
Which of the following is not a neutral refractory ? |
| A. | Silicon carbide |
| B. | Magnesite |
| C. | Chromite |
| D. | Graphite |
| Answer» C. Chromite | |
| 459. |
Which one contains maximum percentage of Al2O3 ? |
| A. | Firebrick |
| B. | Sillimanite |
| C. | Magnesite |
| D. | Aluminous firebrick |
| Answer» C. Magnesite | |
| 460. |
Which of the following does not occur during firing/burning of refractories ? |
| A. | Removal of water of hydration. |
| B. | Vitrification. |
| C. | Decrease in crushing strength. |
| D. | Development of stable mineral form. |
| Answer» D. Development of stable mineral form. | |
| 461. |
Silicon carbide refractories are used in the |
| A. | muffle furnace |
| B. | zinc smelting furnace |
| C. | ceramic recuperators |
| D. | all (a), (b) and (c) |
| Answer» E. | |
| 462. |
__________ nozzles are used in continuous casting of steel, |
| A. | Zircon |
| B. | Thoria |
| C. | Carborundum |
| D. | Beryllia |
| Answer» B. Thoria | |
| 463. |
silicon carbide refractories have very low |
| A. | refractoriness (< 1700 C). |
| B. | thermal conductivity. |
| C. | resistance to thermal shock. |
| D. | none of these. |
| Answer» E. | |
| 464. |
Basic bricks are not made of |
| A. | fireclay |
| B. | magnesite |
| C. | foresterite |
| D. | chromite |
| Answer» B. magnesite | |
| 465. |
With increase in the alumina content in firebricks, its fusion point (refractoriness) |
| A. | decreases linearly |
| B. | remains unchanged |
| C. | increases |
| D. | decreases |
| Answer» D. decreases | |
| 466. |
Which is a basic refractory ? |
| A. | Fireclay |
| B. | Silica |
| C. | Chrome magnesite |
| D. | None of these |
| Answer» D. None of these | |
| 467. |
Refractoriness under load (RUL) is the most important property for the refractory bricks |
| A. | at the hearth bottom of the furnace on which stock is placed. |
| B. | used for furnace insulation. |
| C. | used in the roof of the furnace. |
| D. | none of these. |
| Answer» B. used for furnace insulation. | |
| 468. |
Alumina-graphite bricks are used for lining the |
| A. | slide gate in teeming laddies. |
| B. | continuous casting systems. |
| C. | both (a) and (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 469. |
Machine moulding of dry mixture of refractories requires a pressure of the order of __________ kg/cm2. |
| A. | 10 |
| B. | 100 |
| C. | 500 |
| D. | 1000 |
| Answer» E. | |
| 470. |
Fireclay bricks are never used in the |
| A. | beehive oven |
| B. | coke oven walls |
| C. | zinc roaster |
| D. | lead blast furnace |
| Answer» C. zinc roaster | |
| 471. |
With increasing alumina content, the fusion point of high alumina refractories |
| A. | increases. |
| B. | decreases. |
| C. | remains constant. |
| D. | may increase or decrease ; depends on its alumina content. |
| Answer» B. decreases. | |
| 472. |
Chrome magnesite bricks are used in the |
| A. | side walls of soaking pits and arc furnaces. |
| B. | copper melting furnaces & converters. |
| C. | burner block of glass tanks. |
| D. | all (a), (b) and (c) |
| Answer» E. | |
| 473. |
Fertiliser plant making ammonium sulphate employing gypsum-ammonia reaction (usual practice is to use ammonia and sulphuric acid) is located at |
| A. | Rourkela (under SAIL) |
| B. | Bokaro (under SAIL) |
| C. | Sindri (under FCI) |
| D. | Baroda (under G.S.F.C.) |
| Answer» D. Baroda (under G.S.F.C.) | |
| 474. |
Catalyst used in Haber's process for ammonia production is |
| A. | reduced iron oxide |
| B. | nickel |
| C. | vanadium pentoxide |
| D. | silica gel |
| Answer» B. nickel | |
| 475. |
Sodium tri poly phosphate (STPP) is manufactured by reaction of phosphoric acid with sodium |
| A. | carbonate |
| B. | phosphate |
| C. | bicarbonate |
| D. | silicate |
| Answer» B. phosphate | |
| 476. |
Prilling tower is found in the flowsheet for the manufacture of |
| A. | ammonia |
| B. | urea |
| C. | superphosphate |
| D. | triple superphosphate |
| Answer» C. superphosphate | |
| 477. |
P2O5 content in triple superphosphate is about __________ percent. |
| A. | 42-50 |
| B. | 15-20 |
| C. | 85-90 |
| D. | 70-75 |
| Answer» B. 15-20 | |
| 478. |
H3PO4 is the chemical formula of __________ phosphoric acid. |
| A. | pyro |
| B. | ortho |
| C. | meta |
| D. | none of these |
| Answer» C. meta | |
| 479. |
The concentration (weight %) of nitric acid produced by the oxidation of ammonia and absorption of nitrogen oxides with water is about __________ percent. |
| A. | 60 |
| B. | 30 |
| C. | 95 |
| D. | 100 |
| Answer» B. 30 | |
| 480. |
Urea is formed only |
| A. | in liquid phase |
| B. | in vapour phase |
| C. | at very high temperature |
| D. | at very low pressure (vacuum) |
| Answer» B. in vapour phase | |
| 481. |
Reaction of orthophosphoric acid with soda ash produces |
| A. | sodium tripolyphosphate (STPP) |
| B. | tricresyl phosphate |
| C. | tributyl phosphate |
| D. | nitrophosphate |
| Answer» B. tricresyl phosphate | |
| 482. |
Dehydration of ammonium carbamate (to produce urea) is a/an __________ reaction. |
| A. | reversible |
| B. | catalytic |
| C. | exothermic |
| D. | endothermic |
| Answer» E. | |
| 483. |
Electric process as compared to wet process (for the manufacture of phosphoric acid) |
| A. | can use only high grade phosphate rock. |
| B. | is used less frequently. |
| C. | produces a valuable by-product called gypsum. |
| D. | is weak acid process. |
| Answer» C. produces a valuable by-product called gypsum. | |
| 484. |
Ammonium sulphate fertiliser is |
| A. | the highest concentration nitrogenous fertiliser. |
| B. | the best fertiliser for paddy. |
| C. | a basic fertiliser. |
| D. | a neutral fertiliser. |
| Answer» C. a basic fertiliser. | |
| 485. |
In calcium ammonium nitrate (CAN) fertil-ser |
| A. | nitrate nitrogen is quick acting |
| B. | ammoniacal nitrogen is quick acting |
| C. | nitrate nitrogen is slower acting |
| D. | none of these |
| Answer» B. ammoniacal nitrogen is quick acting | |
| 486. |
Heating of orthophosphoric acid to 250 C produces |
| A. | metaphosphoric acid |
| B. | pyrophosphoric acid |
| C. | no change in it |
| D. | none of these |
| Answer» C. no change in it | |
| 487. |
Vapor phase reaction of ammonia & nitric acid to produce ammonium nitrate is termed as the __________ process. |
| A. | Haber's |
| B. | Stengel |
| C. | Le-chatlier's |
| D. | Du-pont's |
| Answer» C. Le-chatlier's | |
| 488. |
Superphosphate is manufactured by reacting phosphate rock with |
| A. | acetic acid |
| B. | sulphuric acid |
| C. | aluminium chloride |
| D. | none of these |
| Answer» C. aluminium chloride | |
| 489. |
CO2 present in reformed gas (obtained by steam reforming of naphtha) is removed by absorbing in |
| A. | mono-ethanolamine (MEA) |
| B. | slaked lime |
| C. | ammoniacal liquor |
| D. | Methyl-Ethyl Ketone (MEK) |
| Answer» B. slaked lime | |
| 490. |
Which of the following does not come under the category of 'secondary nutrient' for plant growth? |
| A. | Calcium |
| B. | Magnesium |
| C. | Sulphur |
| D. | Oxygen |
| Answer» E. | |
| 491. |
Steam reforming of naphtha is a source of hydrogen production for nitrogeneous fertiliser industry. What is the usual ratio of steam to carbon maintained in the process of steam reforming of naphtha ? |
| A. | 1.5:1 |
| B. | 3.5:1 |
| C. | 10:1 |
| D. | 15:1 |
| Answer» C. 10:1 | |
| 492. |
The thermal efficiency of an air/fuel gas preheating recuperator may be as high as __________ percent. |
| A. | 50 |
| B. | 65 |
| C. | 85 |
| D. | 99 |
| Answer» D. 99 | |
| 493. |
The amount of combustible escaping uncon-sumed from the furnace, depends upon the |
| A. | air supplied and furnace temperature. |
| B. | burner design (thoroughness of mixing versus stratification). |
| C. | air preheat and the flow of gases in the furnace (mixing by induction, by acceleration or by change of direction). |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 494. |
(CH3 C6 H4)3 PO4 is the chemical formula of |
| A. | triple superphosphate |
| B. | tricresyl phosphate |
| C. | flourapatite |
| D. | superphosphate |
| Answer» C. flourapatite | |
| 495. |
In a muffle furnace, the muffle |
| A. | retards the heat transfer. |
| B. | assists in temperature equalisation in the charge. |
| C. | permits the use of controlled atmosphere for the protection of stock. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 496. |
__________ is an indirectly heated furnace. |
| A. | Open hearth furnace |
| B. | Muffle furnace |
| C. | Soaking pit |
| D. | Reheating furnace |
| Answer» C. Soaking pit | |
| 497. |
Which is not a hearth furnace ? |
| A. | Glass tank furnace |
| B. | Open hearth furnace |
| C. | Cupola |
| D. | Reheating furnace |
| Answer» D. Reheating furnace | |
| 498. |
An example of shaft furnace is the |
| A. | L.D. converter |
| B. | glass melting tank |
| C. | blast furnace |
| D. | soaking pit |
| Answer» D. soaking pit | |
| 499. |
Acid dew point temperature (ADT) of a flue gas produced by the combustion of a fuel containing 1% sulphur may be about __________ C. |
| A. | 80 |
| B. | 130 |
| C. | 180 |
| D. | 250 |
| Answer» C. 180 | |
| 500. |
Ceramic coating material for furnace refractory, which increases its emissivity and thus the radiation heat transfer rate in the furnace, comprises of |
| A. | graphite powder |
| B. | thoria |
| C. | zircon powder |
| D. | beryllium |
| Answer» D. beryllium | |