chemical engineering MCQs – Page 294

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 Review each marked answer and report any item that may be outdated or unclear.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

5861. Beehive coke oven________________?
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A. Facilitates by-products recovery

B. Gives larger yield of coke (around 85%) as compared to by-product ovens

C. Produces coke with very poor strength

D. Takes 2-3 days for coking of coal but requires no external fuel for heating

5862. Coke oven gas after passing through return electrostatic tar precipitator (RETP) is used for the_______________?
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A. Hot scarfing of steel slabs

B. Mixing with blast furnace gas

C. Coke oven battery heating

D. Steel ladle drying

5863. In high temperature carbonisation (as compared to low temperature carbonisation) of coal, the______________?
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A. Gas yield is less

B. Aromatic content of tar produced is more

C. Tar yield is more

D. Ignition temperature of coke produced is less

5864. Coal tar (produced by high temperature carbonisation) is the main source of_________________?
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A. Aliphatic compounds

B. Olefins

C. Paraffins

D. Aromatic compounds

5865. Which of the following accounts for maximum energy loss in a boiler ?
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A. Ash content in the fuel

B. Incomplete combustion

C. Flue gases

D. Unburnt carbon in flue gases

5866. Ionisation potential applied across the electrodes of electrostatic tar precipitator is around_____________________?
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A. 60 KV DC

B. 60 KV AC

C. 230 V AC

D. 230 V DC

5867. Carbon Content by weight in air dried wood may be about _______________ percent?
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A. 50

B. 10

C. 80

D. 25

5868. With increases in carbonisation temperature_______________________?
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A. Methane percentage in the coke oven gas increases

B. Tar yield increases

C. Coke even gas yield increases

D. Hydrogen percentage in the coke oven gas decreases

5869. Low temperature carbonisation of coal takes place at ______________ C?
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A. 300

B. 700

C. 150

D. 1100

5870. A good quality coal should have ___________________?
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A. Low fusion point of ash

B. High ash content

C. High sulphur

D. None of these

5871. Quantity of coke produced from metallurgical coal may be around _____________ percent?
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A. 75

B. 30

C. 95

D. 50

5872. Insitu theory and drift theory are related to the____________________?
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A. Coalification

B. Variation of coal quality with depth

C. Origin of coal

D. Origin of petroleum oil

5873. Gross and net calorific value of a fuel will be the same__________________?
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A. Under no circumstances

B. If its carbon content is very low

C. If its ash content is zero

D. If its hydrogen/hydrogen compound content is zero

5874. Low temperature oxidation of coal is accelerated by the____________________?
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A. Storage in compressed piles

B. Absence of porous or friable particles

C. Storage in large heaps

D. All A., B. and C.

5875. Silicon carbide refractories are used in the _____________?
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A. Ceramic recuperators

B. Muffle furnace

C. Zinc smelting furnace

D. All A., B. and C.

5876. Fuel combustion is never cent per cent efficient due to___________________?
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A. Moisture loss

B. All A., B. and C.

C. Dry gas/stack gas loss

D. Incomplete combustion

5877. Segar cones are used for the determination of ____________ of refractories?
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A. Resistance to slag attack

B. Spalling resistance

C. Softening temperature

D. Electrical conductivity

5878. The calorific value of natural gas is about ______________ kcal/Nm3?
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A. 2,500

B. 35,000

C. 10,000

D. 25,000

5879. The combustion reaction, C + O2 = CO2, is ___________________?
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A. Exothermic

B. Autocatalytic

C. Endothermic

D. None of these

5880. When incomplete combustion loss is high, the flue gas analysis shows large amount of ________________?
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A. O2

B. CO2

C. CO

D. C

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