chemical engineering Mcqs
5601. White flue gas (resembling steam) coming out of the chimney of a thermal power plant indicates that the fuel used in the boiler furnace is_________________?
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A. Pitch

B. Pulverised coke

C. Coke oven gas

D. Tar

5602. Which of the following has the highest flame speed ?
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A. H2

B. C2H6

C. CH4

D. CO

5603. Benzol is used_____________________?
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A. As a motor fuel blend

B. For producing benzene, toluene & xylene by its distillation

C. Both A. & B.

D. Neither A. nor B.

5604. Coke made in narrower by-product coke ovens (as compared to wider ovens) is _____________________?
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A. Smaller in size

B. Stronger

C. Less reactive

D. All A., B. & C.
5605. _____________ present in coal is not determined in its ultimate analysis ?
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A. Fixed carbon

B. Hydrogen

C. Nitrogen

D. Total carbon

5606. Main use of soft coke is as _______________ fuel?
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A. Foundry

B. Blast furnace

C. None of these

D. Domestic
5607. Fuel consumption in coke making can be reduced by___________________?
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A. Dry quenching of coke

B. Stamped charging of coal

C. Preheating, blending and de-ashing the coal

D. All A., B. and C.
5608. Which of the following has the highest gross calorific value ?
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A. Blast furnace gas

B. Carburetted water gas

C. Oil refinery gas

D. Coke oven gas

5609. Preheating of combustion air is done to ___________________?
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A. Complete the combustion of fuel

B. Reduce its requirement for effecting the complete combustion

C. Increase the adiabatic flame temperature

D. Increase the calorific value of the fuel

5610. Wobbe index is a characteristic of__________________?
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A. Liquid fuels

B. Gaseous fuels

C. Fat coals

D. Solid fuels

5611. Soft coke is not ___________________?
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A. Used in blast furnaces

B. None of these

C. Produced by low temperature carbonisation of coal

D. A domestic fuel

5612. Tar yield in the low temperature and high temperature carbonisation of dry coal may be respectively ______________ percent?
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A. 10 & 3

B. 3 & 10

C. 15 & 8

D. 10 & 20

5613. Which of the following gaseous fuels has the highest net calorific value (kcal/Nm3) ?
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A. Carburetted water gas

B. Natural gas

C. Producer gas

D. Liquefied petroleum gas
5614. Which of the following is coking ?
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A. Vitrain

B. Fussain

C. Both A. & B.

D. Neither A. nor B.

5615. Which of the following is not a by-product fuel ?
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A. Blast furnace gas

B. Refinery gas

C. Pitch

D. Petrol
5616. Gas yield in the Kopper-Totzek coal gasifier is about ______________ Nm3/ton coal (ash = 35%)?
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A. 1500

B. 3500

C. 150

D. 5000

5617. Sulphur in metallurgical coal__________________?
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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.

5618. Pure carbon is completely burnt in oxygen. The flue gas analysis is 70%CO2, 20%CO and 10%O2. The percent excess oxygen used is __________________?
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A. 10

B. 12.5

C. 20

D. 0
5619. The ratio of maximum adiabatic flame temperature in air to that in pure oxygen is always___________________?
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A. 1

B. < 1

C. > 1

D. Unpredictable

5620. The ratio of % total carbon obtained in the ultimate analysis of coke and % fixed carbon obtained in the proximate analysis is always ___________________?
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A. < 1

B. 1

C. Unpredictable

D. > 1
5621. With increase in moisture content of coal, its_____________________?
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A. Clinkering tendency during combustion increases

B. Calorific value increases sometimes

C. Bulk density always decreases

D. None of these
5622. Pick out the wrong statement ?
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A. ing pulverised fuel

B. None of these

C. h pulverised fuel firing

D. Low grade coal can be used, but generally high volatile matter coals are more suitable for

E. Pulverised fuel can be completely burnt with less percentage of excess air compared to lump

F. Regulation of furnace temperature and atmosphere (oxidising or reducing) is easily possible

5623. Natural draught produced by a chimney depends upon the _____________________?
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A. Density of the chimney gases

B. Height of the chimney

C. Both A. and B.

D. Neither A. nor B.

5624. Calorific value of tar is about _____________ Kcal/kg?
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A. 8800

B. 12000

C. 16000

D. 14000

5625. Power alcohol as compared to straight run gasoline has lower ________________?
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A. Calorific value

B. Viscosity

C. Specific gravity

D. Octane number

5626. KOH solution used in Orsat apparatus absorbs____________________?
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A. CO2

B. SO2

C. Both A. & B.

D. Neither A. nor B.

5627. In Orsats apparatus, ammoniacal cuprous chloride is used for selectivity absorbing________________?
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A. O2

B. CO2

C. CO

D. H2O

5628. Pensky-Marten apparatus is used for those oils, whose flash points are _____________ F?
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A. 90-110

B. > 120

C. < 90

D. < 120

5629. Pick out the wrong statement ?
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A. Adiabatic flame temperatures of actual combustions are always less than the maximum values

B. Theoretical flame temperature is the temperature attained by the products of combustion, when the fuel is burned without loss or gain of heat

C. Burning the fuel with excess pure oxygen results in maximum theoretical flame temperature

D. Burning the fuel with theoretically required amount of pure oxygen results in attainment of maximum adiabatic flame temperature

5630. Which of the following can be made into briquettes without the use of a binder ?
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A. Bituminous coal

B. None of these

C. Lignite

D. Anthracite coal

5631. Lignite is ___________________?
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A. A high rank coal

B. A coking coal

C. A black banded coal which burns with a non-smoky yellowish flame

D. Can be used for gasification and steam generation
5632. Which of the following is a single stage, fixed bed high pressure coal gasification process ?
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A. Kopper-Totzek process

B. Winkler process

C. None of these

D. Lurgi Process
5633. Removal of hydrogen from coke oven gas ___________________?
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A. Decreases its calorific value

B. Is not possible on commercial scale

C. Does not alter its calorific value

D. Increases its calorific value
5634. Which of the following fuel gases has the highest calorific value ?
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A. Coal bed methane (CBM)

B. Natural gas

C. Sewage gas

D. Liquefied petroleum gas (LPG)
5635. Producer gas comprises mainly of _______________________?
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A. CO2 & N2

B. CO & H2

C. CO & N2

D. CO2 & H2

5636. Gray King Assay and Swelling Index of a coal is a measure of its ____________________?
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A. Agglutinating properties

B. Abradability

C. Resistance to impact breakage

D. Swelling characteristics
5637. Quantity of coke oven gas produced by high temperature carbonisation of one ton of dry coal may be around ______________ Nm3?
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A. 3,000

B. 30

C. 30,000

D. 300
5638. Coke oven gas constitutes mainly of ____________________?
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A. H2 & CO2

B. H2 & CH4

C. CH4 & CO

D. H2 & CO

5639. For maximum discharge through a chimney, its height should be___________________?
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A. More than 105.7 metres

B. Infinitely long

C. 200 meters

D. Equal to the height of the hot gas column producing draught
5640. In flue gas analysis by Orsats apparatus, carbon dioxide is absorbed by______________________?
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A. Alkaline pyrogallol solution

B. Cuprous chloride

C. Dilute potassium carbonate

D. Potassium hydroxide
5641. High temperature in gasification of coal favours________________?
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A. High production of CO2

B. Low production of CO2

C. High production of CO

D. Both B. and C.
5642. Presence of free moisture in coal during its high temperature carbonisation _____________________?
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A. Protects the volatile products from pyrolysis (cracking) in the presence of hot coke and hot

B. Reduces the coking time

C. n walls</strong>

D. Increases the loss of fine coal dust from the ovens when charging

E. None of these

5643. Pick out the wrong statement?
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A. Crimp is a measure of the difference between the length of the straightened and unstraightened fibre

B. Nylon fibres have greater water absorption capacity than polyester fibres

C. Dacron fibres, acrylic fibres, viscose rayon fibres & cellulose acetate fibres are all prepared by wet spinning

D. Denier is defined as weight in gm of 9000 metres length of a fibre, while tex is defined as weight in gm of 1000 metres length of fibre

5644. The calorific value of a gas of composition CO2 = 20%, H2 = 50%, CH4 = 30%, is y. If the composition of gas is changed to H2 = 50%, CH4 = 30%, CO2 = 10%, N2 = 10%, then the calorific value will be___________________?
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A. 1.05 y

B. y

C. 0.95 y

D. 1.8 y

5645. The maximum adiabatic flame temperature is attained, when the fuel is burnt with ______________________?
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A. Theoretically required amount of air

B. More than theoretically required amount of air

C. Less than theoretically required amount of air

D. Theoretically required amount of oxygen
5646. Which of the following is unsuitable fuel for producer gas manufacture ?
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A. Coal having low fusion point of its ash

B. Coke

C. Coal having high fusion point of its ash

D. Anthracite

5647. Calorific value of coke even gas produced by low temperature carbonisation of coal is about ____________ Kcal/Nm3?
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A. 2500

B. 10000

C. 4000

D. 6500
5648. Low temperature oxidation and spontaneous combustion of freshly mined coal is accentuated, if __________________?
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A. Smaller fines are stored in large quantity

B. It is stored in tall heaps

C. It contains large amount of volatile matter

D. All A., B. and C.
5649. Which of the following is not a manufactured fuel ?
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A. Coke breeze

B. Charcoal

C. Soft coke

D. Colloidal fuels

5650. As the equilibrium moisture content of the coal increases, its___________________?
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A. Swelling number decreases

B. Swelling number increases

C. Calorific value increases

D. Bulk density decreases