Fuels and Combustion MCQs

469 MCQs  — Chemical Engineering MCQs  (Page 5 of 47)

Attempt Fuels and Combustion Quiz
High excess air in combustion of fuels results in____________________?
A. Increased fuel consumption
B. Incomplete combustion
C. Smoky flame
D. None of these
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Very ______________ coals are completely devoid of cokability i.e., it is non-coking ?
A. Young
B. Mature
C. Both a & b
D. Neither a nor b
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Incomplete combustion of a fuel is characterised by the high _______________ in the flue gas?
A. Smoke
B. Temperature
C. Oxygen
D. Carbon monoxide
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Pitch creosote mixture (PCM) as compared to furnace oil is a better fuel, because its ___________________?
A. Emissivity factor is higher
B. Sulphur content is lower
C. Flue gas has lower dew point thereby facilitating more waste heat recovery
D. All a., b. and c.
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Which is the most matured coal ?
A. Lignite
B. Bituminous
C. Semi-anthracite
D. Anthracite
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Percentage of carbon monoxide in blast furnace gas may be around ____________________ ?
A. 8
B. 14
C. 22
D. 52
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Main use of hard coke produced by high temperature carbonisation is in the ____________________ ?
A. Iron blast furnace
B. Cupola in foundries
C. Sinter making
D. Domestic ovens
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For every 10% increase in the excess air; the fuel consumption increases by _______________ percent?
A. 0.1
B. 0.2
C. 0.5
D. 1.0
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A coal gasifier operating at 20 atm. (e.g. Lurgi gasifier) as compared to one operating at atmospheric pressure (e.g. Kopper-Totzek or Winkler gasifier) will produce a gas having _____________________?
A. Higher methane content and thus higher calorific value
B. Higher carbon monoxide content
C. Lower carbon dioxide content
D. None of these
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“Overfire burning” in a furnace is a phenomenon characterised by the __________________?
A. Supply of excess fuel
B. Supply of excess air
C. Burning of carbon monoxide and other incombustibles in upper zone of furnace by supplying
MorE air
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Word of the Day
22 Jul
Combative
ready or eager to fight or argue.
لڑاکا، متنازع، جھگڑالو

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