chemical engineering MCQs – Page 291

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 Review each marked answer and report any item that may be outdated or unclear.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
5801. Conversion of silica mineral to Cristobalite is accompanied by reduction in its ____________________?
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A. Volume

B. Specific gravity

C. Both A. & B.

D. Neither A. nor B.

5802. Blast furnace coke is made from coal by_____________________?
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A. High temperature carbonisation

B. Low temperature carbonisation

C. Medium temperature carbonisation

D. Heating the coal in an oven in presence of air

5803. Magnesite chrome bricks are used in the___________________?
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A. Reheating furnaces

B. All A., B. and C.

C. Soaking pits

D. Roof lining of basic open hearth & other basic furnaces

5804. Water content in ground refractory material to be shaped into bricks by hand moulding is about ______________ percent?
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A. 20

B. 5

C. 40

D. 55

5805. Coke oven gas is a better fuel than blast furnace gas, because of its higher________________?
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A. Heat release rate (thus requiring smaller combustion chamber)

B. Adiabatic flame temperature

C. All A., B. and C.

D. Calorific value, cleanliness and relatively low distribution cost (due to its low specific gravity)

5806. Lower part of hot metal mixer are lined with _____________ bricks?
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A. Carborundum

B. High alumina

C. Superduty fireclay

D. Silica

5807. Zirconia refractory_________________?
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A. Has poor electrical conductivity at high temperature

B. Cannot be used as an insulator

C. Is produced from baddeleyite

D. Does not react with basic slags

5808. By-products recovery process from coal carbonisation is termed as direct, indirect and semi direct process depending upon the method of recovery of_______________?
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A. Ammonia

B. None of these

C. Benzol

D. Tar

5809. Which of the following impurities reduces the refractoriness of magnesite bricks ?
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A. SiO2

B. Al2O3

C. All A., B. & C.

D. CaO

5810. _____________ is not a single oxide-refractory?
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A. Silicon carbide

B. Magnesia

C. None of these

D. Zirconia

5811. Most Cermets, which normally have high thermal conductivity and high thermal shock resistance, comprises of ceramic & metallic components of ______________ percent respectively?
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A. 20 and 80

B. 80 and 20

C. 50 and 50

D. 60 and 40

5812. _____________ nozzles are used in continuous casting of steel?
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A. Thoria

B. Beryllia

C. Carborundum

D. Zircon
5813. Stack heat losses can be minimised by________________?
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A. Using low c.v. fuels

B. Controlling the excess air

C. Oxygen enrichment of combustion air

D. Maintaining proper draft in the furnace

5814. Which of the following is a primary fuel ?
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A. Blast furnace coke

B. Wood charcoal

C. Natural gas

D. Gasoline

5815. Fuel gases containing hydrocarbons (e.g. coke oven gas) are not preheated before burning, mainly because __________________?
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A. It reduces its flame temperature tremendously

B. It reduces its calorific value tremendously

C. The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot

D. There are chances of explosion during preheating

5816. A certain thickness of the coal, if stored unscientifically on soft (katcha) ground having no metallic/concrete flooring gets sunked into the ground, which is termed as the carpet loss. The carpet loss may be of the order of ______________ cms?
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A. 1 to 2

B. 20 to 40

C. 3 to 4

D. 5 to 15
5817. Bright coal__________________?
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A. Contains more than 90% durain

B. Contains mainly vitrain & clarain and is generally coking

C. Contains more than 90% fussain

D. Is non-coking

5818. Refractoriness/fusion points of Superduty refractories is _______________ C?
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A. > 1730

B. 1520-1630

C. 1630-1670

D. > 2000

5819. SiO2 percentage in firebrick is about____________________?
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A. 35-40

B. 55-60

C. > 94

D. 80-85

5820. Water gas constitutes mainly of __________________?
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A. CO2 & H2

B. CO & N2

C. CO & H2

D. CH4 & H2