Fuels And Combustion MCQs

Option A: 550

Option B: 750

Option C: 950

Option D: 1150

Correct Answer: 950 ✔

Option A: Higher amount of methane

Option B: Lower amount of hydrogen

Option C: Both A. and B.

Option D: Higher amount of both methane and hydrogen

Correct Answer: C. Both A. and B. ✔

Option A: 300

Option B: 2000

Option C: 5000

Option D: 10000

Correct Answer: 2000 ✔

Option A: Less air for combustion

Option B: Correct amount of air for combustion

Option C: Too much air for combustion

Option D: Pulverised coal in boilers

Correct Answer: Too much air for combustion ✔

Option A: Producer gas

Option B: Coal gas from underground gasification of coal

Option C: Refinery gases

Option D: None of these

Correct Answer: Refinery gases ✔

Option A: Coke even gas yield increases

Option B: Tar yield increases

Option C: Hydrogen percentage in the coke oven gas decreases

Option D: Methane percentage in the coke oven gas increases

Correct Answer: Coke even gas yield increases ✔

Option A: Fixed carbon and having a heating value around 13, 200 BTU/1b

Option B: Ash and heating value around 13, 200 BTU/1b

Option C: Fixed carbon and heating value around 132 BTU/1b

Option D: None of these

Correct Answer: Fixed carbon and having a heating value around 13, 200 BTU/1b ✔

Option A: Presence of large quantity of hydrogen in the fuel

Option B: Low calorific value of the fuel

Option C: High sulphur content in the fuel

Option D: Lack of thorough mixing of fuel with air

Correct Answer: Lack of thorough mixing of fuel with air ✔

Option A: Ammonium sulphate

Option B: Ammonium nitrate

Option C: Ammonium phosphate

Option D: None of these

Correct Answer: Ammonium sulphate ✔

Option A: CH4 (upto 90%)

Option B: C2H6

Option C: C3H8

Option D: H2

Correct Answer: CH4 (upto 90%) ✔

Option A: Washing fine coal dust (< 0.5 mm size)

Option B: Washing lump coal (> 80 mm size)

Option C: Removing ash from the coal based on difference in specific gravity of coal and ash

Option D: All A., B. and C.

Correct Answer: Washing fine coal dust (< 0.5 mm size) ✔

Option A: Recarbonising steel

Option B: Making carbon electrodes

Option C: Blending with highly coking coal to check its swelling which helps in saving coke even walls

Option D: All A., B. and C.

Correct Answer: D. All A., B. and C. ✔

Option A: 5

Option B: 25

Option C: 55

Option D: 75

Correct Answer: 5 ✔

Option A: Flue gases

Option B: Ash content in the fuel

Option C: Incomplete combustion

Option D: Unburnt carbon in flue gases

Correct Answer: Flue gases ✔

Option A: Insecticides (e.g. moth balls)

Option B: Unsaturated polyesters

Option C: Drug intermediates e.g. β-naphthol

Option D: All A., B. and C.

Correct Answer: D. All A., B. and C. ✔

Option A: 2.4

Option B: 1.75

Option C: 0.87

Option D: 11.4

Correct Answer: 2.4 ✔

Option A: Potassium hydroxide

Option B: Cuprous chloride

Option C: Alkaline pyrogallol solution

Option D: None of these

Correct Answer: Alkaline pyrogallol solution ✔

Option A: Low temperature carbonisation

Option B: High temperature carbonisation

Option C: Medium temperature carbonisation

Option D: Heating the coal in an oven in presence of air

Correct Answer: High temperature carbonisation ✔

Option A: Increase

Option B: Decrease

Option C: Increase or decrease depending on the fuel type

Option D: Not change

Correct Answer: Decrease ✔

Option A: Metallurgical coke

Option B: Soft coke

Option C: Very low calorific value coke oven gas

Option D: No by-products

Correct Answer: Soft coke ✔

Option A: 2.5

Option B: 0.5

Option C: 10

Option D: 20

Correct Answer: 2.5 ✔

Option A: Ash fusion temperature

Option B: Calorific value

Option C: Ignition temperature

Option D: Caking index

Correct Answer: Ignition temperature ✔

Option A: Transport the coal to the burner

Option B: Dry the coal

Option C: Ensure efficient burning of coal around the burner

Option D: Reduce primary air requirement

Correct Answer: Ensure efficient burning of coal around the burner ✔

Option A: Permits the use of high ash content coal

Option B: Permits the use of low fusion point ash coal

Option C: Accelerates the burning rate and economises on fuel combustion

Option D: All A., B. and C.

Correct Answer: Accelerates the burning rate and economises on fuel combustion ✔

Option A: Junker’s

Option B: Bomb

Option C: Boy’s

Option D: None of these

Correct Answer: Bomb ✔

Option A: Lignite

Option B: Semi-anthracite

Option C: Sub-bituminous

Option D: Bituminous

Correct Answer: Semi-anthracite ✔

Option A: Fixed carbon and having a heat value of 13, 200 BTU/1b

Option B: Ash and a heating value of 13, 200 BTU/1b

Option C: Fixed carbon and a heating value of 132 BTU/1b

Option D: None of these

Correct Answer: Fixed carbon and having a heat value of 13, 200 BTU/1b ✔

Option A: Volatile matter content increases

Option B: Carbon content decreases

Option C: Moisture content increases

Option D: Ash content increases

Correct Answer: Volatile matter content increases ✔

Option A: Propane and acetylene

Option B: Propane and LPG

Option C: Sewage gas and gobar gas

Option D: B.F. gas and coke oven gas

Correct Answer: Propane and acetylene ✔

Option A: Sulphur & phosphorous content

Option B: Porosity

Option C: Fusion point of its ash

Option D: Hardness & strength

Correct Answer: Sulphur & phosphorous content ✔

Option A: Reduces its sulphur and ash content

Option B: Controls its ash fusibility and increases its calorific value

Option C: Improves its coking properties

Option D: All A., B. and C.

Correct Answer: D. All A., B. and C. ✔

Option A: Origin of petroleum oil

Option B: Origin of coal

Option C: Coalification

Option D: Variation of coal quality with depth

Correct Answer: Origin of coal ✔

Option A: Colour

Option B: Moisture content

Option C: Ash content

Option D: Volatile matter

Correct Answer: Volatile matter ✔

Option A: Incomplete combustion

Option B: Dry gas/stack gas loss

Option C: Moisture loss

Option D: All A., B. and C.

Correct Answer: D. All A., B. and C. ✔

Option A: Fixed carbon

Option B: Volatile matter

Option C: Ash

Option D: Oxygen

Correct Answer: Volatile matter ✔

Option A: Blast furnace gas

Option B: Natural gas

Option C: Producer gas

Option D: Water gas

Correct Answer: Natural gas ✔

Option A: Produces more slag when used in the blast furnace

Option B: Has poor strength and abrasion resistance

Option C: Is desirable in producer gas manufacture

Option D: None of these

Correct Answer: Produces more slag when used in the blast furnace ✔

Option A: Caking power

Option B: Calorific value

Option C: Hydrogen content

Option D: Oxygen content

Correct Answer: Oxygen content ✔

Option A: Contains more than 90% durain

Option B: Contains more than 90% fussain

Option C: Contains mainly vitrain & clarain and is generally coking

Option D: Is non-coking

Correct Answer: Contains mainly vitrain & clarain and is generally coking ✔

Option A: 1 to 2

Option B: 3 to 4

Option C: 5 to 15

Option D: 20 to 40

Correct Answer: 5 to 15 ✔

Option A: Require smaller combustion chamber

Option B: Have high calorific value

Option C: Have high adiabatic flame temperature

Option D: None of these

Correct Answer: Require smaller combustion chamber ✔

Option A: Only O2

Option B: Both O2 and CO2

Option C: Both O2 and CO

Option D: All CO, CO2, and O2

Correct Answer: Both O2 and CO2 ✔

Option A: Difference in gross & net calorific value of the coke oven gas

Option B: Free carbon content in tar

Option C: Yield percentage of coke

Option D: Yield of ammonia present in coke oven gas

Correct Answer: Difference in gross & net calorific value of the coke oven gas ✔

Option A: 5

Option B: 25

Option C: 55

Option D: 80

Correct Answer: 5 ✔

Option A: Increases

Option B: Decreases

Option C: Remain constant

Option D: None of these

Correct Answer: Increases ✔

Option A: Pollution control aspect

Option B: Draught to be created

Option C: Limitation of constructional facilities

Option D: None of these

Correct Answer: Draught to be created ✔

Option A: Fire point

Option B: Smoke point

Option C: Burning temperature

Option D: Kindling temperature

Correct Answer: Burning temperature ✔

Option A: 6

Option B: 12

Option C: 18

Option D: 24

Correct Answer: 24 ✔

Option A: Producer gas

Option B: Water gas

Option C: Coke oven gas

Option D: Blast furnace gas

Correct Answer: Coke oven gas ✔

Option A: Is less liable to spontaneous combustion on storage

Option B: Is more difficult to ignite and produces a shorter flame

Option C: Requires smaller combustion space and less secondary air

Option D: None of these

Correct Answer: None of these ✔

Option A: Entrained

Option B: Moving

Option C: Fixed

Option D: Fluidised

Correct Answer: Entrained ✔

Option A: 230 V AC

Option B: 60 KV AC

Option C: 230 V DC

Option D: 60 KV DC

Correct Answer: 60 KV DC ✔

Option A: Aromatic compounds

Option B: Aliphatic compounds

Option C: Paraffins

Option D: Olefins

Correct Answer: Aromatic compounds ✔

Option A: Lignite

Option B: Bituminous coal

Option C: Semi-anthracite

Option D: Anthracite

Correct Answer: Bituminous coal ✔

Option A: Blast furnace coke

Option B: Gasoline

Option C: Natural gas

Option D: Wood charcoal

Correct Answer: Natural gas ✔

Option A: 18

Option B: 48

Option C: 8

Option D: 80

Correct Answer: 18 ✔

Option A: Fuel consumption for the same heat load

Option B: Stack gas temperature

Option C: Percentage of oxygen in flue gases

Option D: All A., B. and C.

Correct Answer: D. All A., B. and C. ✔

Option A: Inherent impurities

Option B: Adhering impurities

Option C: Mineral matter

Option D: Both B. and C.

Correct Answer: D. Both B. and C. ✔

Option A: Low preheat of air

Option B: Fine grinding

Option C: High excess air

Option D: All A., B. and C

Correct Answer: Fine grinding ✔

Option A: CO & H2

Option B: CO & N2

Option C: CO2 & H2

Option D: CH4 & H2

Correct Answer: CO & H2 ✔

Option A: Hot scarfing of steel slabs

Option B: Mixing with blast furnace gas

Option C: Coke oven battery heating

Option D: Steel ladle drying

Correct Answer: Coke oven battery heating ✔

Option A: As a motor fuel

Option B: As an explosive

Option C: For making insecticides (e.g., DDT, BHC etc.), detergent & rubber (SBR)

Option D: As a perfume

Correct Answer: For making insecticides (e.g., DDT, BHC etc.), detergent & rubber (SBR) ✔

Option A: Hydrogen

Option B: Sulphur

Option C: Carbon

Option D: None of these

Correct Answer: None of these ✔

Option A: Inferior coke compared to low temperature carbonisation

Option B: Less of gases compared to liquid products

Option C: Large quantity of tar compared to low temperature carbonisation

Option D: None of these

Correct Answer: None of these ✔

Option A: CH4 & CO2

Option B: CO & CO2

Option C: CH4 & N2

Option D: CO & N2

Correct Answer: CH4 & CO2 ✔

Option A: Winkler process

Option B: Lurgi process

Option C: Kopper-Totzek process

Option D: All can produce same methane content

Correct Answer: Lurgi process ✔

A. All tar is evolved at 700°C
C. Hard semi-coke starts shrinking at 600°C
D. All A., B. and C.

Correct Answer: D. All A., B. and C. ✔

Option A: Classified

Option B: Carbonised

Option C: Caking

Option D: Non-caking

Correct Answer: Caking ✔

Option A: Domestic

Option B: Blast furnace

Option C: Foundry

Option D: None of these

Correct Answer: Domestic ✔

Option A: 150

Option B: 1500

Option C: 3500

Option D: 5000

Correct Answer: 150 ✔

Option A: Problem of uniform heating along its height

Option B: Structural strength of silica bricks

Option C: Problem in door cleaning

Option D: Buckling of ram of pusher car at the time of coke pushing

Correct Answer: Problem of uniform heating along its height ✔

Option A: Convert CO to CO2

Option B: Increase the combustion rate

Option C: Increase the gas production rate

Option D: Minimise the chances of clinker formation

Correct Answer: Minimise the chances of clinker formation ✔

Option A: Petroleum coke

Option B: Beehive coke

Option C: Foundry coke

Option D: Metallurgical coke

Correct Answer: Petroleum coke ✔

Option A: Gives an idea of the fusion temperature of ash

Option B: Is related to its calorific value

Option C: Is a measure of its size stability, when stored & exposed to weather

Option D: Is a measure of its caking tendency

Correct Answer: Is a measure of its size stability, when stored & exposed to weather ✔

Option A: H2O

Option B: CO2

Option C: CO

Option D: CH4

Correct Answer: CO ✔

Option A: 1kg mole

Option B: 22.4 Nm3

Option C: 32 kg

Option D: All A., B. and C.

Correct Answer: D. All A., B. and C. ✔

Option A: Fuel

Option B: Air

Option C: Both A. & B.

Option D: Neither A. nor B.

Correct Answer: C. Both A. & B. ✔

Option A: Benzene, toluene & xylene

Option B: Tar & creosote

Option C: Ammonia & phenol

Option D: Anthracene & phenol

Correct Answer: Benzene, toluene & xylene ✔

Option A: Fermentation

Option B: Oxidation

Option C: Hydrogenation

Option D: None of these

Correct Answer: Fermentation ✔

Option A: Pulverised fuel

Option B: Perfumes

Option C: Insecticides

Option D: Plastics

Correct Answer: Pulverised fuel ✔

Option A: Decrease in the c.v. of coke oven gas

Option B: Increase in its throughput

Option C: Increase in the c.v. of coke oven gas

Option D: No change in the c.v. of coke oven gas

Correct Answer: Decrease in the c.v. of coke oven gas ✔

Option A: As a motor fuel blend

Option B: For producing benzene, toluene & xylene by its distillation

Option C: Both A. & B.

Option D: Neither A. nor B.

Correct Answer: C. Both A. & B. ✔

Option A: Less moisture content

Option B: High fusion point of its ash

Option C: High bulk density

Option D: Lower ash content

Correct Answer: High fusion point of its ash ✔

Option A: 1000

Option B: 4000

Option C: 6000

Option D: 8000

Correct Answer: 4000 ✔

Option A: 2

Option B: 3

Option C: 4

Option D: 5

Correct Answer: 5 ✔

Option A: Gasification of coal

Option B: Synthesis of gasoline (from water gas)

Option C: Hydrogenation of coal to produce gasoline

Option D: None of these

Correct Answer: Synthesis of gasoline (from water gas) ✔

Option A: Potassium hydroxide

Option B: Dilute potassium carbonate

Option C: Cuprous chloride

Option D: Alkaline pyrogallol solution

Correct Answer: Potassium hydroxide ✔

Option A: Sensible

Option B: Latent

Option C: Sensible and latent

Option D: None of these

Correct Answer: Sensible ✔

Option A: CO & N2

Option B: CO & H2

Option C: CO2 & N2

Option D: CO2 & H2

Correct Answer: CO & N2 ✔

Option A: Less volatile matter

Option B: More carbon

Option C: Greater percentage of ash

Option D: All A., B. and C.

Correct Answer: D. All A., B. and C. ✔

Option A: H2, CmHn & CO2

Option B: CO, H2 & CH4

Option C: CO2, O2 & CO

Option D: N2, H2 & CO2

Correct Answer: CO, H2 & CH4 ✔

Option A: Vitrain

Option B: Fussain

Option C: Both A. & B.

Option D: Neither A. nor B.

Correct Answer: Vitrain ✔

Option A: Both steam and electrical power

Option B: Lean gas (e.g., B.F. gas)

Option C: Rich gas (e.g., coke oven gas)

Option D: Both B. and C.

Correct Answer: D. Both B. and C. ✔

Option A: Pitch

Option B: Fuel oil

Option C: Blast furnace gas

Option D: Bituminous coal

Correct Answer: Fuel oil ✔

Option A: Light paraffinic fuel oils is equal to that of equivalent olefins

Option B: n-paraffin is lower than that of iso-paraffins of the same compounds

Option C: Light paraffinic fuel oils is higher than that of equivalent olefins

Option D: Light paraffinic fuel oils is lower than that of equivalent olefins

Correct Answer: Light paraffinic fuel oils is higher than that of equivalent olefins ✔

Option A: Fixed carbon

Option B: Total carbon

Option C: Hydrogen

Option D: Nitrogen

Correct Answer: Fixed carbon ✔

Option A: Less reactive

Option B: Stronger

Option C: Smaller in size

Option D: All A., B. & C.

Correct Answer: D. All A., B. & C. ✔

Option A: Swelling characteristics

Option B: Abradability

Option C: Agglutinating properties

Option D: Resistance to impact breakage

Correct Answer: Swelling characteristics ✔

Option A: 5

Option B: 10

Option C: 20

Option D: 35

Correct Answer: 20 ✔

Option A: Yield of coke oven gas is 290 Nm3 /ton dry coal

Option B: Volatile matter in coke is zero

Option C: Temperature maintained is 700°C

Option D: Yield of tar is about 3% of dry coal

Correct Answer: Temperature maintained is 700°C ✔