Q.1

Desirable "Micum Index" values of metal-lurical coke are

  • M40 > 78% and M10 < 10%.
  • M40 > 4% and M10 < 80%.
  • M40 > 10% and M10 < 78%.
  • M40 > 98% and M10 < 2%.
Q.2

Optimum preheating temperature for pitch creosote mixture (PCM) which is also termed as C.T.F-before atomisation through burners is

  • 200 °F
  • 200 °C
  • 200 °K
  • 200 °R
Q.3

Benzol is used

  • as a motor fuel blend.
  • for producing benzene, tolune & xylene by its distillation.
  • both (a) & (b).
  • neither (a) nor (b).
Q.4

Mott and Wheeler test is conducted on coke to find its

  • reactivity with O2.
  • abradability.
  • phosphorus content.
  • volatile matter content.
Q.5

The pyragallol solution used in orsat apparatus can absorb

  • only O2
  • both O2 and CO2
  • both O2 and CO
  • all CO, CO2, and O2
Q.6

A sooty flame can be made non-luminous by

  • admitting more gas.
  • shutting gas supply.
  • admitting more air.
  • shutting air supply.
Q.7

Bomb calorimeter is used to determine the (where, GCV - Gross Calorific Value. NCV - Net Calorific Value.)

  • GCV at constant pressure.
  • GCV at constant volume.
  • NCV at constant pressure.
  • NCV at constant volume.
Q.8

Calorific value of bituminous coal may be around __________ Kcal/kg.

  • 500
  • 1500
  • 6500
  • 20000
Q.9

Largest constituent of coke oven gas is

  • N2
  • H2
  • CH4
  • CO2
Q.10

Catalyst used in Fischer-Tropsch process is

  • nickel
  • zinc oxide
  • alumina
  • thorium oxide
Q.11

High temperature carbonisation of coal produces

  • inferior coke compared to low temperature carbonisation.
  • less of gases compared to liquid products.
  • large quantity of tar compared to low temperature carbonisation.
  • none of these.
Q.12

Fossil fuels mean

  • solid fuels
  • liquid fuels
  • those fuels which are found in the crust of earth.
  • premature fuels with low calorific value.
Q.13

In high temperature carbonisation (as compared to low temperature carbonisation) of coal

  • coke oven gas yield is more.
  • tar yield is less but free carbon in tar is more.
  • calorific value of coke oven gas is less.
  • all (a), (b), and (c).
Q.14

Which of the following coke has the least percentage of ash ?

  • Petroleum coke
  • Beehive coke
  • Foundary coke
  • Metallurgical coke
Q.15

__________ process is meant for direct hydrogenation of coal to produce liquid fuel.

  • Fischer-Tropsch
  • Bergius
  • Lurgi
  • None of these
Q.16

Fuel combustion is never cent per cent efficient due to

  • incomplete combustion
  • dry gas/stack gas loss
  • moisture loss
  • all (a), (b) and (c)
Q.17

Pick out the wrong statement.

  • High concentration of oxygen in flue gas means high stack loss.
  • Gaseous fuels require the least % excess air for complete combustion.
  • The ratio of fixed carbon to volatile matter percentage in coal is called its 'fuel ratio'.
  • Calorific value of natural gas is more than that of LPG.
Q.18

Compound coke ovens are those which can be heated by

  • both steam and electrical power.
  • lean gas (e.g., B.F. gas).
  • rich gas (e.g., coke oven gas).
  • both (b) and (c).
Q.19

The fuel ratio of a coal is

  • the ratio of its percentage of fixed carbon to that of volatile matter.
  • helpful in estimation of its rank.
  • both (a) and (b).
  • neither (a) nor (b).
Q.20

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

  • is less liable to spontaneous combustion on storage.
  • is more difficult to ignite and produces a shorter flame.
  • requires smaller combustion space and less secondary air.
  • none of these.
Q.21

A coal that softens and fuses on heating is

  • classified
  • carbonised
  • caking
  • non-caking
Q.22

Which of the following oil gasification processes is non-catalytic ?

  • Semet-Solvay process
  • Segas process
  • Onia-Gegi process
  • Steam reforming of naphtha
Q.23

Dust content in raw blast furnace gas is about __________ gm/Nm3 , hence it is cleaned to the dust level of about <mg /Nm3 before use.

  • 15-30
  • 1-2
  • 70-100
  • 150-200
Q.24

Gobar gas is produced by the __________ of cown dung.

  • fermentation
  • oxidation
  • hydrogenation
  • none of these
Q.25

In Orsat's apparatus, ammoniacal cuprous chloride is used for selectivity absorbing

  • CO
  • CO2
  • O2
  • H2O
Q.26

Fussain

  • is friable, charcoal like substance.
  • has highest fixed carbon and lowest volatile matter content of all the four banded components of coal.
  • is non-coking, but when blended with highly coking coal, controls its swelling and produces high strength coke on carbonisation.
  • all (a), (b) and (c).
Q.27

Producer gas comprises mainly of

  • CO & N2
  • CO & H2
  • CO2 & N2
  • CO2 & H2
Q.28

Which of the following coal gasification processes will produce gas having maximum methane content ?

  • Winkler process.
  • Lurgi process.
  • Kopper-Totzek process.
  • All can produce same methane content.
Q.29

Which of the following is the most poisonous gas ?

  • Coke oven gas
  • Producer gas
  • Blast furnace gas
  • L.D. converter gas
Q.30

Sometimes water is sprayed during coal charging in the coke oven, which helps in

  • prevention of clinker formation in the oven.
  • controlling the dust nuisance while charging the coal.
  • reducing the cracking of hydrocarbons in the gas and increasing the percentage of CO & H2 in the gas (due to the endothermic reaction represented by C + H2O = CO + H2)
  • all (a), (b) and (c).
Q.31

Anthracite coal

  • contains more volatile matter than bituminous coal.
  • ignites more easily than bituminous coal.
  • is essentially a coking coal.
  • burns with short, bluish, yellow-tipped flame producing very little smoke.
Q.32

Soft coke is not

  • produced by low temperature carbonisation of coal.
  • a domestic fuel.
  • used in blast furnaces.
  • none of these.
Q.33

Fischer-Tropsch method aims at the

  • gasification of coal.
  • synthesis of gasoline (from water gas).
  • hydrogenation of coal to produce gasoline.
  • none of these.
Q.34

Producer gas containing least amount of tar is produced by the

  • partial combustion of coal.
  • partial combustion of large size (< 50 mm) coke.
  • high pressure gasification of coal (e.g. in Lurgi gasifier).
  • atmospheric pressure gasification of coal (e.g., in Kopper-Totzek gasifier).
Q.35

A coal gasifier opearating atatm. (e.g. Lugri gasifier) as compared to one operating at atmospheric pressure (e.g. Kopper-Totzek or Winkler gasifier) will produce a gas having

  • higher methane content and thus higher calorific value.
  • higher carbon monoxide content.
  • lower carbon dioxide content.
  • none of these.
Q.36

Main constituent of the gas produced from a gobar gas plant is

  • CO2
  • CH4
  • H2
  • CO
Q.37

Which of the following is not increased by using preheated combustion air in place of ordinary air at room temperature ?

  • Calorific value of the fuel.
  • Flame temperature achieved.
  • Speed of combustion of fuel.
  • Heat transfer rate to the stock in the furnace.
Q.38

"Micum Index" of a coke is a measure of its

  • reactivity.
  • porosity.
  • bulk density.
  • hardness & strength.
Q.39

Assam coals suffers mainly from the disadvantage of high __________ content.

  • ash
  • volatile matter
  • sulphur (4-6%)
  • moisture
Q.40

'Mixed gas' used in steel plants is a mixture of

  • B.F. gas and coke oven gas.
  • coke oven gas and converter gas.
  • coke oven gas and L.P.G.
  • blast furnace gas and naphtha vapor.
Q.41

Kopper-Totzek coal gasifier

  • can give ammonia synthesis gas (H2 + N2).
  • is a moving bed reactor.
  • cannot use coking coal.
  • operate at very high pressure.
Q.42

Which of the following is not a manufactured fuel ?

  • Coke breeze
  • Soft coke
  • Colloidal fuels
  • Charcoal
Q.43

In high temperature carbonisation (as compared to low temperature carbonisation) of coal, the

  • gas yield is less.
  • tar yield is more.
  • ignition temperature of coke produced is less.
  • aromatic content of tar produced is more.
Q.44

'Mixed gas' used in steel plants is a mixture of

  • B.F. gas and coke oven gas.
  • coke oven gas and converter gas.
  • coke oven gas and L.P.G.
  • blast furnace gas and naphtha vapor.
Q.45

The bright glow of a combustion process is the characteristic of __________ temperature oxidation of coal.

  • fast & high
  • slow & low
  • slow & high
  • fast & slow
Q.46

Calorific value of

  • light paraffinic fuel oils is equal to that of equivalent olefins.
  • n-paraffin is lower than that of iso-paraffins of the same compounds.
  • light paraffinic fuel oils is higher than that of equivalent olefins.
  • light paraffinic fuel oils is lower than that of equivalent olefins.
Q.47

Number of macrocomponents present in coal according to Stopes are

  • four
  • five
  • six
  • two
Q.48

Mineral matter, 'M' and ash percentage 'A' in coal are roughly related as

  • M = 1.8 A
  • M = 0.5 A
  • M = 1.1 A
  • M = A
Q.49

Blast furnace gas constitutes mainly of

  • N2 & CH4
  • N2 & H2
  • N2 & CO
  • CH4 & CO2
Q.50

To avoid fire by spontaneous combustion of coal due to its low temperature oxidation, it should be stored in

  • shallow and small piles.
  • fine sizes without the presence of any lump.
  • closed space without any ventilation facility.
  • large heaps with small surface to volume ratio.
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