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.
| 1401. |
Which of the following fuels is the best for burning on chain grate stoker ? |
| A. | Non-caking coal |
| B. | Caking coal |
| C. | Coking coal |
| D. | Pulverised coal. |
| Answer» B. Caking coal | |
| 1402. |
Low temperature oxidation of coal resulting from bad storage conditions does not decrease its |
| A. | caking power |
| B. | calorific value |
| C. | hydrogen content |
| D. | oxygen content |
| Answer» E. | |
| 1403. |
Calorific value of gobar gas (containing CH4 = 60% , H2 = 10% ; CO2 = 30%) may be about __________ Kcal/Nm3. |
| A. | 1800 |
| B. | 3200 |
| C. | 5400 |
| D. | 10200 |
| Answer» D. 10200 | |
| 1404. |
Which will have the least volatile matter and hence will be the most difficult to ignite? |
| A. | Bituminous coal |
| B. | Coke |
| C. | Semi-bituminous coal |
| D. | Aanthracite |
| Answer» C. Semi-bituminous coal | |
| 1405. |
Oxygen content in a flue gas was found to be 4%. It implies that excess air used for combustion was around __________ percent. |
| A. | 4 |
| B. | 96 |
| C. | 20 |
| D. | 40 |
| Answer» D. 40 | |
| 1406. |
As time passes, the calorific value of stored coal |
| A. | decreases |
| B. | increases |
| C. | remains unaltered |
| D. | may increase or decrease (depends on the method of storage). |
| Answer» B. increases | |
| 1407. |
Calorific value of dry wood may be around __________ Kcal/kg. |
| A. | 5 |
| B. | 50 |
| C. | 500 |
| D. | 5000 |
| Answer» B. 50 | |
| 1408. |
By-products are __________ recovered in 'Beehive ovens'. |
| A. | fully |
| B. | partially |
| C. | not at all |
| D. | negligibly |
| Answer» D. negligibly | |
| 1409. |
Stack (chimney) height in a big thermal power plant is dictated by the |
| A. | pollution control aspect. |
| B. | draught to be created. |
| C. | limitation of constructional facilities. |
| D. | none of these. |
| Answer» C. limitation of constructional facilities. | |
| 1410. |
A coal having high ratio of volatile matter to fixed carbon as compared to a coal having low ratio of volatile matter to fixed carbon |
| A. | is less liable to spontaneous combustion on storage. |
| B. | is more difficult to ignite and produces a shorter flame. |
| C. | requires smaller combustion space and less secondary air. |
| D. | none of these. |
| Answer» E. | |
| 1411. |
Which of the following coke has the least percentage of ash ? |
| A. | Petroleum coke |
| B. | Beehive coke |
| C. | Foundary coke |
| D. | Metallurgical coke |
| Answer» B. Beehive coke | |
| 1412. |
Soft coke is not |
| A. | produced by low temperature carbonisation of coal. |
| B. | a domestic fuel. |
| C. | used in blast furnaces. |
| D. | none of these. |
| Answer» D. none of these. | |
| 1413. |
A good coking coal should have high __________ content. |
| A. | ash |
| B. | sulphur & phosphorus |
| C. | moisture |
| D. | none of these |
| Answer» E. | |
| 1414. |
Calorific value of pitch creosote mixture (PCM) i.e., C.T.F.-200 is about |
| A. | 8800 kcal/m |
| B. | <sup>3</sup> |
| C. | 8800 kcal/kg |
| D. | same as that of coal middling |
| E. | 25000 kcal/kg |
| Answer» C. 8800 kcal/kg | |
| 1415. |
Bomb calorimeter is used to determine the (where, GCV - Gross Calorific Value. NCV - Net Calorific Value.) |
| A. | GCV at constant pressure. |
| B. | GCV at constant volume. |
| C. | NCV at constant pressure. |
| D. | NCV at constant volume. |
| Answer» C. NCV at constant pressure. | |
| 1416. |
Which of the following oil gasification processes is non-catalytic ? |
| A. | Semet-Solvay process |
| B. | Segas process |
| C. | Onia-Gegi process |
| D. | Steam reforming of naphtha |
| Answer» B. Segas process | |
| 1417. |
Dust content in raw blast furnace gas is about __________ gm/Nm3 , hence it is cleaned to the dust level of about < 10 mg /Nm3 before use. |
| A. | 15-30 |
| B. | 1-2 |
| C. | 70-100 |
| D. | 150-200 |
| Answer» B. 1-2 | |
| 1418. |
In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of |
| A. | transportation of coal. |
| B. | drying of coal. |
| C. | combustion of coal by supplying it around the burner. |
| D. | preheating the primary air. |
| Answer» D. preheating the primary air. | |
| 1419. |
Fussain |
| A. | is friable, charcoal like substance. |
| B. | has highest fixed carbon and lowest volatile matter content of all the four banded components of coal. |
| C. | is non-coking, but when blended with highly coking coal, controls its swelling and produces high strength coke on carbonisation. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 1420. |
Low temperature oxidation and spontaneous combustion of freshly mined coal is accentuated, if |
| A. | it contains large amount of volatile matter. |
| B. | it is stored in tall heaps. |
| C. | smaller fines are stored in large quantity. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 1421. |
Coking time in narrow by-product coke ovens is around __________ hours. |
| A. | 18 |
| B. | 48 |
| C. | 8 |
| D. | 80 |
| Answer» B. 48 | |
| 1422. |
In high temperature carbonisation (as compared to low temperature carbonisation) of coal, the |
| A. | gas yield is less. |
| B. | tar yield is more. |
| C. | ignition temperature of coke produced is less. |
| D. | aromatic content of tar produced is more. |
| Answer» E. | |
| 1423. |
Which of the following is a lean fuel gas ? |
| A. | Coke oven gas |
| B. | LPG |
| C. | Blast furnace gas |
| D. | Natural gas |
| Answer» D. Natural gas | |
| 1424. |
Coalification means the |
| A. | process of conversion of lignite into anthracite. |
| B. | underground gasification of coal. |
| C. | complete combustion of coal. |
| D. | direct hydrogenation of coal. |
| Answer» B. underground gasification of coal. | |
| 1425. |
Hard coke is manufactured from |
| A. | lignite |
| B. | bituminous coal |
| C. | semi-anthracite |
| D. | anthracite |
| Answer» C. semi-anthracite | |
| 1426. |
Percentage of carbon monoxide in blast furnace gas may be around |
| A. | 8 |
| B. | 14 |
| C. | 22 |
| D. | 52 |
| Answer» D. 52 | |
| 1427. |
The main drawback of supplying more excess air in the combustion of fuel is the |
| A. | excessive power requirement of air blower. |
| B. | enhanced sensible heat loss in the flue gas. |
| C. | intermittant and uncontrolled combustion of the fuel. |
| D. | high exit flue gas temperature from the furnace. |
| Answer» C. intermittant and uncontrolled combustion of the fuel. | |
| 1428. |
Width of the coke oven towards coke side is slightly more than that on pusher side to |
| A. | facilitate easy discharging of coke as it swells during carbonisation. |
| B. | facilitate uniform heating of the oven. |
| C. | increase the output of the coke. |
| D. | none of these. |
| Answer» B. facilitate uniform heating of the oven. | |
| 1429. |
Dry air requirement for burning 1 Nm3 of CO to CO2 may be around __________ Nm3. |
| A. | 2.4 |
| B. | 1.75 |
| C. | 0.87 |
| D. | 11.4 |
| Answer» B. 1.75 | |
| 1430. |
Degree of carbonisation of coal during coke making can be roughly judged by the __________ of the coke produced. |
| A. | colour |
| B. | moisture content |
| C. | ash content |
| D. | volatile matter |
| Answer» E. | |
| 1431. |
Ammonia content in raw coke oven gas is about __________ gm/Nm3. |
| A. | 1 |
| B. | 15 |
| C. | 50 |
| D. | 100 |
| Answer» C. 50 | |
| 1432. |
Coal is heated in absence of air for 7 minutes at a temperature of about __________ C, during its volatile matter determination for proximate analysis. |
| A. | 550 |
| B. | 750 |
| C. | 950 |
| D. | 1150 |
| Answer» D. 1150 | |
| 1433. |
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» B. Propane and LPG | |
| 1434. |
One kg of carbon for theoretically complete combustion requires __________ kg of air. |
| A. | 11.5 |
| B. | 0.5 |
| C. | 23 |
| D. | 12 |
| Answer» B. 0.5 | |
| 1435. |
Percentage of hydrogen in coke oven gas may be around |
| A. | 10 |
| B. | 25 |
| C. | 45 |
| D. | 60 |
| Answer» E. | |
| 1436. |
Function of secondary air in pulverised coal firing is to |
| A. | transport the coal to the burner. |
| B. | dry the coal. |
| C. | ensure efficient burning of coal around the burner. |
| D. | reduce primary air requirement. |
| Answer» D. reduce primary air requirement. | |
| 1437. |
Yield of pitch from distillation of high temperature tar is around __________ percent. |
| A. | 10 |
| B. | 25 |
| C. | 65 |
| D. | 90 |
| Answer» D. 90 | |
| 1438. |
During combustion of coal on grate, clinker formation is increased by the |
| A. | use of thick fire bed. |
| B. | low fusion point of ash (< 1100 C). |
| C. | use of preheated primary air. |
| D. | all (a), (b) & (c). |
| Answer» E. | |
| 1439. |
If the specific heat of gaseous products of combustion of a fuel is high, the abiabatic flame temperature will be |
| A. | low |
| B. | high |
| C. | very high, if the fuel is of low calorific value |
| D. | none of these |
| Answer» B. high | |
| 1440. |
Sulphur in metallurgical coal |
| A. | contributes to its heating value. |
| B. | affects the quality of steel produced as cracks develop on the surface while rolling the steel. |
| C. | both (a) and (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 1441. |
Catalyst used in Fischer-Tropsch process is |
| A. | nickel |
| B. | zinc oxide |
| C. | alumina |
| D. | thorium oxide |
| Answer» B. zinc oxide | |
| 1442. |
Which of the following coal gasification processes will produce gas having maximum methane content ? |
| A. | Winkler process. |
| B. | Lurgi process. |
| C. | Kopper-Totzek process. |
| D. | All can produce same methane content. |
| Answer» C. Kopper-Totzek process. | |
| 1443. |
Blast furnace coke is made from coal by |
| A. | low temperature carbonisation. |
| B. | high temperature carbonisation. |
| C. | medium temperature carbonisation. |
| D. | heating the coal in an oven in presence of air. |
| Answer» C. medium temperature carbonisation. | |
| 1444. |
Yield of blast furnace gas is about __________ Nm3 /ton of pig iron. |
| A. | 300 |
| B. | 2000 |
| C. | 5000 |
| D. | 10000 |
| Answer» C. 5000 | |
| 1445. |
Coke oven gas is stripped of its H2S and mercaptans content by |
| A. | absorption in wash oil. |
| B. | adsorption on bog iron bed. |
| C. | bubbling it through dilute sulphuric acid. |
| D. | adsorption on silica gel. |
| Answer» C. bubbling it through dilute sulphuric acid. | |
| 1446. |
In Lurgi coal gasifier, |
| A. | coking coals cannot be used. |
| B. | low carbon conversion efficiency is achieved. |
| C. | entrainment of solids is higher. |
| D. | larger quantity of coal can be processed. |
| Answer» E. | |
| 1447. |
For every 10% increase in the excess air; the fuel consumption increases by __________ percent. |
| A. | 0.1 |
| B. | 2 |
| C. | 5 |
| D. | 10 |
| Answer» B. 2 | |
| 1448. |
Dry air required to burn 1 kg of carbon completely may be around __________ kg. |
| A. | 11 |
| B. | 2 |
| C. | 20 |
| D. | 38 |
| Answer» B. 2 | |
| 1449. |
__________ extractor uses centrifugal force for separating the two phases. |
| A. | Treybal |
| B. | Schiebel |
| C. | Podbielniak |
| D. | None of these |
| Answer» D. None of these | |
| 1450. |
Leaching of uranium ore and gold ore is done in |
| A. | centrifugal extractor |
| B. | Pachuka tanks |
| C. | Bollman extractor |
| D. | none of these |
| Answer» C. Bollman extractor | |