chemical engineering MCQs – Page 288

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 Review each marked answer and report any item that may be outdated or unclear.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
5741. Fat coal means a coal having ___________________?
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A. Low ash content

B. Low calorific value

C. Non smoking tendency

D. High volatile matter
5742. Calorific value of ____________________?
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A. Light paraffinic fuel oils is equal to that of equivalent olefins

B. n-paraffin is lower than that of iso-paraffins of the same compounds

C. Light paraffinic fuel oils is lower than that of equivalent olefins

D. Light paraffinic fuel oils is higher than that of equivalent olefins
5743. Percentage of hydrogen in coke oven gas may be around ___________________?
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A. 45

B. 60

C. 25

D. 10

5744. Mixed gas used in steel plants is a mixture of___________________?
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A. B.F. gas and coke oven gas

B. Coke oven gas and converter gas

C. Coke oven gas and L.P.G

D. Blast furnace gas and naphtha vapor

5745. Main constituents of purified Lurgi gas are___________________?
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A. CO2, O2 & CO

B. CO, H2 & CH4

C. N2, H2 & CO2

D. H2, CmHn & CO2

5746. Calorific value of coke oven gas is around ______________ Kcal/Nm3?
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A. 7500

B. 900

C. 2000

D. 4200
5747. Highly reactive coke have lower ___________________?
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A. Porosity

B. Coke reactivity index (CRI)

C. Critical air blast (CAB) value

D. Both B. and C.

5748. Hard pitch is used for making_____________________?
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A. Insecticides

B. Perfumes

C. Plastics

D. Pulverised fuel
5749. Flue gas obtained on complete combustion of pure acetylene (a hydrocarbon fuel) will contain __________________?
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A. CO

B. CO2

C. H2O

D. Both B. & C.
5750. Pick out the wrong statement ?
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A. Addition polymers are generally formed by chain growth polymerisation

B. Teflon is formed by step growth polymerisation

C. Bakelite is formed by step growth polymerisation

D. Condensation polymers are generally formed by step growth polymerisation

5751. Rate of low temperature oxidation of coal due to bad storage conditions_______________?
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A. Is accelerated by storage in large heaps with small surface to volume ratio

B. Is more for low volatile coal compared to high volatile coal

C. Decreases with increase in surface area

D. Does not vary with increase in surface area

5752. Pick out the wrong statement ?
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A. Cross-linked branched chain polymers are either elastometric or thermosetting

B. Linear polymers are formed from bifunctional groups only and are normally thermoplastic

C. ction</strong>

D. unctional monomer formulation reduces its solubility and increases the softening point

E. Branching in case of cross-linked polymers caused by small amount of impurities in

F. Dibasic acids reacts with dihydric alcohols to give polyesters using addition polymerisation
5753. Width of the coke oven towards coke side is slightly more than that on pusher side to____________________?
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A. None of these

B. Increase the output of the coke

C. Facilitate easy discharging of coke as it swells during carbonisation

D. Facilitate uniform heating of the oven

5754. Low temperature oxidation of coal during storage does not decrease its__________________?
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A. Caking power

B. None of these

C. Calorific value

D. Oxygen content

5755. Net calorific value is the gross calorific value less the _______________ heat of water in the product of combustion when cooled to 15C ?
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A. None of these

B. Sensible and latent

C. Sensible

D. Latent

5756. A good coking coal should have high ______________ content?
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A. Ash

B. Sulphur & phosphorus

C. None of these

D. Moisture

5757. Coke ovens in steel plant are heated by ___________________?
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A. Electricity

B. Coke oven gas

C. Mixed gas

D. Both B. & C.
5758. Which of the following accentuates clinkering trouble on furnace grate burning coal ?
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A. Low reactivity of carbonised residue containing high proportions of iron & sulphur

B. All A., B. and C.

C. Thick fire bed and preheated primary air

D. Low forced draught and fuel bed temperature

5759. Fuel can be defined as a substance which produces heat by___________________?
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A. All A., B. & C.

B. Nuclear fission

C. Nuclear fusion

D. Combustion

5760. C/H ratio is the minimum in case of_________________?
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A. Coal

B. Naphtha

C. Furnace oil

D. Natural gas