chemical engineering MCQs – Page 292

Practise multiple-choice questions from chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs

5821. By-products are _____________ recovered in Beehive ovens ?
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A. Negligibly

B. Partially

C. Fully

D. Not at all

5822. Efficient burning of anthracite coal requires______________________?
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A. All A., B. and C

B. Fine grinding

C. Low preheat of air

D. High excess air

5823. The advantage of firing pulverised coal in the furnace lies in the fact, that it____________________?
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A. Permits the use of high ash content coal

B. Permits the use of low fusion point ash coal

C. All A., B. and C.

D. Accelerates the burning rate and economises on fuel combustion

5824. Chrome magnesite bricks are_________________?
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A. Neutral in nature

B. Made by mixing 30% Chromite and 70% Periclase

C. Having higher RUL than silica bricks

D. Acidic in nature

5825. Chrome magnesite is not used in the ____________________?
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A. All A., and B. and C.

B. Aluminium melting furnaces

C. Wear out lining of steel melting furnaces

D. Inner lining of L.D. converter

5826. Semi-silica bricks compared to silica bricks have_______________?
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A. Less fusion point

B. Better spalling resistance

C. Both A. and B.

D. Neither A. not B.

5827. Producer gas containing least amount of tar is produced by the_________________?
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A. Atmospheric pressure gasification of coal (e.g., in Kopper-Totzek gasifier)

B. Partial combustion of coal

C. High pressure gasification of coal (e.g. in Lurgi gasifier)

D. Partial combustion of large size (< 50 mm) coke

5828. Presence of force moisture in coal is most disadvantageous during its __________________?
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A. Washing

B. Storage

C. Pulverisation

D. Transportation and handling

5829. Shatter index of metallurgical coke on 2 inches and 0.5 inch screen should be respectively around _______________ percent?
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A. 80 and 97

B. 95 and 100

C. 40 and 70

D. 25 and 97

5830. 64-132) rank coal (ASTM) means a coal with 64%___________________?
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A. None of these

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

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

D. Fixed carbon and having a heating value around 13, 200 BTU/1b

5831. The sequence of absorption in flue gas analysis by Orsats apparatus is respectively_______________________?
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A. CO, O2, CO2

B. CO2, O2, CO

C. CO2, CO, O2

D. O2, CO2, CO

5832. Yield of blast furnace gas is about _______________ Nm3 /ton of pig iron?
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A. 10000

B. 5000

C. 300

D. 2000

5833. Kopper-Totzek coal gasifier (installed in a coal based nitrogeneous fertiliser plant) employs a/an ______________ bed gasifier?
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A. Moving

B. Entrained

C. Fluidised

D. Fixed

5834. Which of the following is not a neutral refractory ?
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A. Chromite

B. Silicon carbide

C. Magnesite

D. Graphite

5835. When the coal is heated in absence of air, it is called its ________________?
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A. Gasification

B. Coalification

C. Deoxidation

D. Carbonisation

5836. Which of the following is not an acidic refractory?
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A. Bauxite bricks

B. Magnesia bricks

C. Silica bricks

D. Fireclay bricks

5837. An indication of degree of firing in silica brick is its____________________?
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A. None of these

B. Specific gravity

C. RUL

D. Fusion point

5838. Which one contains maximum percentage of Al2O3 ?
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A. Firebrick

B. Magnesite

C. Aluminous firebrick

D. Sillimanite

5839. Zircon refractories have__________________?
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A. High spalling resistance

B. All A., B. and C.

C. High RUL (1600C) and refractoriness (> 2000C)

D. Low co-efficient of expansion

5840. Lurgi gasifier (high pressure gasifier) as compared to Kopper Totzek gasifier (atmospheric pressure gasifier) produces __________________?
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A. Higher amount of methane

B. Lower amount of hydrogen

C. Both A. and B.

D. Higher amount of both methane and hydrogen

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