Ignites less easily than anthracite

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

Produces coke with very poor strength

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

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

Facilitates by-products recovery

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Q. Optimum preheating temperature for pitch creosote mixture (PCM) which is also termed as C.T.F-200, before atomisation through burners is

(A) 200°R
(B) 200°K
(C) 200°C
(D) 200°F

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Q. The ratio of % total carbon obtained in the ultimate analysis of coke and % fixed carbon obtained in the proximate analysis is always

(A) 1
(B) < 1
(C) > 1
(D) Unpredictable

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Q. Compound coke ovens are those which can be heated by

(A) Both steam and electrical power
(B) Lean gas (e.g., B.F. gas)
(C) Rich gas (e.g., coke oven gas)
(D) Both B and C

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Q. Bomb calorimeter is used to determine the (where, GCV - Gross Calorific Value. NCV - Net Calorific Value.)

(A) GCV at constant pressure
(B) GCV at constant volume
(C) NCV at constant pressure
(D) NCV at constant volume

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Q. Which of the following is a measure of the agglutinating (i.e., binding) property of coal?

(A) Caking index
(B) Thickness of plastic layer
(C) Gray-king index
(D) Swelling index

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Q. Bituminous coal

(A) Ignites less easily than anthracite
(B) Is generally coking
(C) Burns with smoky yellow flame
(D) Both B and C

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Q. The main product of high temperature carbonisation of coal is

(A) Coke
(B) Ammonia
(C) Tar
(D) Coke oven gas

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Q. With increase in the temperature of carbonisation of coal

(A) Hydrogen content of coke oven gas increases due to cracking of hydrocarbons
(B) Methane content in the coke oven gas decreases and carbon monoxide content increases
(C) Calorific value of the coke oven gas decreases due to cracking of hydrocarbons which is not compensated by increase in CO & H₂ content
(D) All of the above

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Q. Flue gas discharge velocity through chimney of a big thermal power plant may be around __________ m/sec.

(A) 0.5
(B) 10
(C) 50
(D) 500

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Q. Beehive coke oven

(A) Produces coke with very poor strength
(B) Gives larger yield of coke (around 85%) as compared to by-product ovens
(C) Takes 2-3 days for coking of coal but requires no external fuel for heating
(D) Facilitates by-products recovery

Fuels and Combustion MCQs with answers Page - 16

Q. Optimum preheating temperature for pitch creosote mixture (PCM) which is also termed as C.T.F-200, before atomisation through burners is

Q. The ratio of % total carbon obtained in the ultimate analysis of coke and % fixed carbon obtained in the proximate analysis is always

Q. Compound coke ovens are those which can be heated by

Q. Bomb calorimeter is used to determine the (where, GCV - Gross Calorific Value. NCV - Net Calorific Value.)

Q. Which of the following is a measure of the agglutinating (i.e., binding) property of coal?

Q. Bituminous coal

Q. The main product of high temperature carbonisation of coal is

Q. With increase in the temperature of carbonisation of coal

Q. Flue gas discharge velocity through chimney of a big thermal power plant may be around __________ m/sec.

Q. Beehive coke oven

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