chemical engineering fuels and combustion MCQs – Page 11

Practise multiple-choice questions from chemical engineering fuels and combustion for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering fuels and combustion Mcqs
201. Abel apparatus is used for those oils, whose flash points are ___________F?
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A. < 120

B. 300-600

C. > 120

D. > 280

202. Which of the following fuel gases has the highest calorific value ?
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A. Liquefied petroleum gas (LPG)

B. Sewage gas

C. Natural gas

D. Coal bed methane (CBM)

203. Coalification means the ___________________?
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A. Complete combustion of coal

B. Direct hydrogenation of coal

C. Process of conversion of lignite into anthracite

D. Underground gasification of coal

204. Grindability index of a coal is 100. It implies that the ___________________?
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A. Coal can be pulverised with great difficulty

B. Power consumption in grinding the coal will be very high

C. Coal can be easily pulverised

D. Coal cant be pulverised

205. Lurgi gasifier (high pressure gasifier) as compared to Kopper Totzek gasifier (atmospheric pressure gasifier) produces __________________?
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A. Higher amount of methane

B. Lower amount of hydrogen

C. Both A. and B.

D. Higher amount of both methane and hydrogen

206. Presence of free moisture in coal during its high temperature carbonisation _____________________?
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A. None of these

B. Reduces the coking time

C. Increases the loss of fine coal dust from the ovens when charging

D. Protects the volatile products from pyrolysis (cracking) in the presence of hot coke and hot

E. n walls</strong>

207. Compound coke ovens are those which can be heated by __________________?
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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.
208. The ratio of % total carbon obtained in the ultimate analysis of coke and % fixed carbon obtained in the proximate analysis is always ___________________?
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A. > 1

B. < 1

C. 1

D. Unpredictable

209. Which of the following is not applicable to fluidised bed combustion of coal ?
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A. None of these

B. It cannot burn low grade coal

C. Less heat transfer surface area is required in boilers

D. It achieves higher fuel combustion efficiency

210. Which of the following is not used as a binder in coal briquetting ?
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A. Line

B. Tar

C. Molasses

D. Pitch

211. Presence of force moisture in coal is most disadvantageous during its __________________?
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A. Pulverisation

B. Transportation and handling

C. Washing

D. Storage

212. Washing of coal does not reduce its______________________?
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A. Fusion point of ash

B. None of these

C. S & P content

D. Heating value

213. A fuel with high heat release rate will_________________?
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A. None of these

B. Have high calorific value

C. Require smaller combustion chamber

D. Have high adiabatic flame temperature

214. A coal having high ratio of volatile matter to fixed carbon as compared to a coal having low ratio of volatile matter to fixed carbon _________________?
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A. Is less liable to spontaneous combustion on storage

B. Requires smaller combustion space and less secondary air

C. None of these

D. Is more difficult to ignite and produces a shorter flame

215. Low temperature oxidation and spontaneous combustion of freshly mined coal is accentuated, if __________________?
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A. It is stored in tall heaps

B. All A., B. and C.

C. Smaller fines are stored in large quantity

D. It contains large amount of volatile matter

216. Pick out the wrong statement ?
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A. Cokes of high reactivity are obtained from weakly coking coals

B. Cokes of high reactivity are obtained from strongly coking coals

C. Reactivity of coke is inversely proportional to its absolute density

D. Abrasion index of the coke is a measure of its hardness

217. Junkers calorimeter is used to determine the calorific value of______________________?
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A. None of these

B. Gaseous fuels

C. Pulverised coal

D. Fuel oil

218. Coking time in a commercial high temperature coal carbonisation plant is about ______________ hours?
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A. 36

B. 18

C. 6

D. 28

219. Yield of charcoal in high temperature carbonisation of wood is about _____________ percent?
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A. 50

B. 75

C. 10

D. 25
220. Which of the following coal gasification processes will produce gas having maximum methane content ?
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A. Lurgi process

B. Winkler process

C. All can produce same methane content

D. Kopper-Totzek process