Fuels and Combustion MCQs

469 MCQs  — Chemical Engineering MCQs  (Page 28 of 47)

Attempt Fuels and Combustion Quiz
Preheating of coal charge for the coke ovens reduces the __________________?
A. Time of carbonisation
B. Yield of gas and tar
C. Fuel consumption in coking
D. All a., b. and c.
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Washing of coal does not reduce its______________________?
A. S & p content
B. Heating value
C. Fusion point of ash
D. None of these
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Pure carbon is completely burnt in oxygen. The flue gas analysis is 70%CO2, 20%CO and 10%O2. The percent excess oxygen used is __________________?
A. 20
B. 12.5
C. 0
D. 10
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Blast furnace gas constitutes mainly of_________________?
A. N2 & ch4
B. N2 & h2
C. N2 & co
D. Ch4 & co2
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Which of the following is a single stage, fixed bed high pressure coal gasification process ?
A. Winkler process
B. Kopper-totzek process
C. Lurgi process
D. None of these
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In low temperature carbonisation of coal, the________________?
A. Yield of coke oven gas is 290 nm3 /ton dry coal
B. Volatile matter in coke is zero
C. Temperature maintained is 700°c
D. Yield of tar is about 3% of dry coal
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Furnace oil consumption in a furnace for a given duty employing preheated combination air (at 300°) may be reduced by about ______________ percent as compared to the use of atmospheric combustion air?
A. 5
B. 10
C. 20
D. 35
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Gray King Assay and Swelling Index of a coal is a measure of its ____________________?
A. Swelling characteristics
B. Abradability
C. Agglutinating properties
D. Resistance to impact breakage
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Coke made in narrower by-product coke ovens (as compared to wider ovens) is _____________________?
A. Less reactive
B. Stronger
C. Smaller in size
D. All a., b. & c.
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_____________ present in coal is not determined in its ultimate analysis ?
A. Fixed carbon
B. Total carbon
C. Hydrogen
D. Nitrogen
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Word of the Day
23 Jul
Aisle
a passage between rows of seats in a building such as a church or theatre, an aircraft, or train.
طویل تنگ راستہ، نشتوں کے درمیان راستہ

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