chemical engineering MCQs – Page 295

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 Review each marked answer and report any item that may be outdated or unclear.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
5881. Which of the following is not a manufactured fuel ?
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A. Furnace oil

B. Bagasse

C. Kerosene

D. Semi-coke

5882. Resistance to slag attack of a refractory _____________________?
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A. Depends on the nature of slag & refractory

B. All A., B. and C.

C. Decreases, if defective joints & cracks exist in the refractory

D. Decreases at higher temperature

5883. Improper storage condition results in the weathering of coal and spontaneous combustion, which increases its_________________?
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A. Calorific value

B. Yield of carbonised products

C. Friability & oxygen content

D. Caking index

5884. During combustion of a gaseous fuel, the presence of a non-luminous flame is an indication of the____________________?
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A. Incomplete combustion

B. Complete combustion

C. High oxygen in flue gas

D. None of these

5885. Degree of carbonisation of coal during coke making can be roughly judged by the ______________ of the coke produced?
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A. Moisture content

B. Colour

C. Volatile matter

D. Ash content

5886. Calorific value of bituminous coal may be around ______________ Kcal/kg?
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A. 500

B. 6500

C. 1500

D. 20000

5887. Chromite refractories_____________________?
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A. All A., B. and C.

B. Are bonded with lime and clay

C. (Free from silica) have better thermal fatigue resistance than silica and magnesite refractories.

D. Are resistant to basic slag

5888. A steel member used in the furnace construction to take the thrust of the brickwork is called___________________?
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A. Breast wall

B. Baffle

C. Buckstay

D. Armouring

5889. As the C/H ratio of the fuel increases, the amount of CO2 formed on combustion _______________ for the same percentage of excess air?
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A. May increase or decrease depending on the type of fuel

B. Remain same

C. Decreases

D. Increases
5890. Explosion limit of blast furnace gas is 37 to 71% gas in gas-air mixture. It means that the blast furnace gas will explode when burnt in a confined space, if its concentration in the gas-air mixture is _______________ percent?
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A. 71%

B. None of these

C. In between 37 & 71%
5891. The calorific value is the highest out of the following for__________________?
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A. Blast furnace gas

B. Producer gas

C. Coke oven gas

D. Water gas

5892. An ideal refractory should have high__________________?
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A. None of these

B. Shrinkage ability

C. Fusion point

D. Spalling rate

5893. Calorific values of both the solid as well as the liquid fuels can be determined by ______________ calorimeter?
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A. None of these

B. Boys

C. Bomb

D. Junkers

5894. Orsat apparatus is meant for ___________________?
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A. Finding out combustion efficiency

B. None of these

C. Gravimetric analysis of flue gas

D. Direct determination of nitrogen in flue gas by absorbing it in ammoniacal cuprous chloride

5895. During coking of coal, the ash content (percentage)________________?
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A. Remain constant

B. None of these

C. Decreases

D. Increases
5896. The function of secondary combustion air is to ______________________?
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A. None of these

B. Completely burn the volatile matter

C. Burn the lumpy coal

D. Pneumatically convey the pulverised coal

5897. Magnesite bricks are used in those parts of furnaces, which are __________________?
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A. None of these

B. Subjected to temperature fluctuation

C. Required to resist corrosive basic slag

D. Subjected to high load

5898. Which of the following fuel gases will require maximum amount of air for combustion of 1 Nm3 gas ?
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A. Blast furnace gas

B. Producer gas

C. Natural gas

D. Water gas

5899. Hollow refractory bricks are made by___________________?
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A. Hand moulding

B. Extrusion

C. Slip casting

D. pressing/machine moulding

5900. Preheating of a gaseous fuel results in increased____________________?
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A. Ignition temperature

B. Flame temperature

C. Flame length

D. Quantity of flue gas