chemical engineering MCQs – Page 284

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 Review each marked answer and report any item that may be outdated or unclear.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

5661. Which will have the least volatile matter and hence will be the most difficult to ignite ?
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A. Coke

B. Semi-bituminous coal

C. Anthracite

D. Bituminous coal

5662. Fusion point of coal ash increases with increase in its ____________ content?
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A. Lime and magnesia

B. All A., B. and C.

C. Iron silicate

D. Iron sulphate

5663. Pick out the correct statement ?
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A. All A., B. and C.

B. Oxygen content decreases from lignite to bituminous coal as the coalification increases

C. With increase in oxygen content, moisture holding capacity of coal increases and the caking power decreases

D. The less the oxygen content, better is the coal, as it reduces the calorific value

5664. Which of the following constituents of a fuel does not contribute to its calorific value on combustion ?
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A. Sulphur

B. None of these

C. Hydrogen

D. Carbon

5665. Bomb calorimeter is used for the determination of calorific value of the _____________ fuels?
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A. Gaseous

B. Solid

C. Liquid

D. Both B. and C.

5666. Percentage of methane in coke oven gas may be around _____________________?
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A. 25

B. 50

C. 5

D. 15

5667. A coal with high ash content is undesirable, as________________?
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A. causes its spalling due to different co-efficient of expansion/contraction of the refractory

B. the ash

C. All A., B. and C.

D. The ash retains the sulphur & phosphorus and thus affects the quality of products in

E. boiler tubes thereby reducing the heat transfer

F. The ash in molten condition gets absorbed in the pores of the refractory lining of the furnace

5668. Naphthalene is removed from coke oven gas by________________?
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A. Adsorbing on bog iron bed

B. None of these

C. Absorbing in vetro-coke solution

D. Scrubbing with wash oil (a petroleum product)

5669. The heat of combustion of a fuel___________________?
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A. Is always negative

B. Is always positive

C. Cant be known without calculating it

D. Is equal to the heat of formation

5670. Which of the following is not a by-product recovered in a high temperature coal carbonisation plant ?
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A. Pitch-creosote mixture (PCM)

B. Ethylene

C. Benzol

D. Naphthalene

5671. Out of the following, which is the most important parameter for the blast furnace grade coke ?
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A. Volatile matter content

B. Moisture content

C. Ash content

D. CSR & CRI

5672. Tar is a better fuel than furnace oil, because of its___________________?
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A. Higher calorific value

B. Lower sulphur content

C. Higher emissivity (0.8-0.9) resulting in higher radiation heat transfer rate

D. Both A. and B.

5673. Pick out the wrong statement ?
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A. Protein is a natural polymer

B. Neoprene is a natural rubber

C. Polythene is a copolymer, while SBR is a homopolymer

D. Polystyrene is a thermoplastic polymer

5674. Benzene is used__________________?
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A. For making insecticides (e.g., DDT, BHC etc.), detergent & rubber (SBR)

B. As an explosive

C. As a motor fuel

D. As a perfume

5675. Pick out the wrong statement ?
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A. Abrasion index of the coke is a measure of its hardness

B. Cokes of high reactivity are obtained from strongly coking coals

C. Reactivity of coke is inversely proportional to its absolute density

D. Cokes of high reactivity are obtained from weakly coking coals

5676. The main product of high temperature carbonisation of coal is__________________?
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A. Coke

B. Coke oven gas

C. Tar

D. Ammonia

5677. Which of the following has the highest calorific value (kcal/Nm3) ?
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A. Gobar gas

B. LPG

C. Natural gas

D. Carburetted water gas

5678. A carbonaceous fuel (containing no H2 or hydrocarbons) is burnt and the resulting flue gas contains 21% CO2. It means that___________________?
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A. 21% excess air has been used for combustion

B. Complete combustion of fuel has taken place

C. 21% excess oxygen has been used for combustion

D. No excess air has been used for combustion

5679. The main function of primary air in pulverised coal fired burner is to_________________?
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A. Dry and transport the coal

B. Have proper combustion by supplying it around the burner

C. Preheat the tertiary air used for complete combustion of CO to CO2

D. Burn CO to CO2

5680. Oxygen content in a flue gas was found to be 4%. It implies that excess air used for combustion was around ______________ percent?
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A. 20

B. 4

C. 96

D. 40

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