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You Are On Multi Choice Question Bank SET 680
34001. Coking time in a commercial high temperature coal carbonisation plant is about __________ hours.
(A): 6 (B): 18 (C): 28 (D): 36
34002. Which of the following has the least calorific value (kcal/Nm3) ?
(A): Blast furnace gas (B): Coke oven gas (C): Sewage gas (D): Natural gas
34003. Commercial production of petrol from coal (as practised in a factory at Sasol in South Africa) is done by the __________ of coal.
(A): hydrogenation (B): gasification (C): carbonisation (D): none of these
34004. The combustion reaction, C + O2 = CO2, is
(A): exothermic (B): endothermic (C): autocatalytic (D): none of these
34005. For maximum discharge through a chimney, its height should be
(A): 200 meters. (B): infinitely long. (C): more than 105.7 metres. (D): equal to the height of the hot gas column producing draught.
34006. Which of the following is not applicable to fluidised bed combustion of coal ?
(A): It can not burn low grade coal. (B): It achieves higher fuel combustion efficiency. (C): Less heat transfer surface area is required in boilers. (D): None of these.
34007. Coal containing large quantity of __________ are difficult to wash.
(A): ash (B): inherent mineral matter (C): free impurities (D): volatile matter
34008. Which of the following is not a micro component present in coal ?
(A): Micrinite (B): Clarain (C): Fusinite (D): Liptinite
34009. Calorific values of both the solid as well as the liquid fuels can be determined by __________ calorimeter.
(A): bomb (B): none of these
34010. A coal containing high amount of volatile matter will have
(A): low ignition temperature (B): very little ash content (C): high fusion point of its ash (D): low adiabatic flame temperature
34011. The maximum adiabatic flame temperature in air is __________ the maximum flame temperature in pure oxygen.
(A): lower than (B): higher than (C): same as (D): not related to
34012. Which of the following gaseous fuels has the highest net calorific value (kcal/Nm3)?
(A): Producer gas (B): Carburetted water gas (C): Natural gas (D): Liquified petroleum gas
34013. Which of the following is coking ?
(A): Vitrain (B): Fussain (C): both & (D): Neither nor
34014. Undercharging of coal in the by-product coke ovens results in
(A): decrease in the c.v. of coke oven gas. (B): increase in its throughput. (C): increase in the c.v. of coke oven gas. (D): no change in the c.v. of coke oven gas.
34015. During the carbonisation of coal
(A): all tar is evolved at < 600°C. (B): evolution of H2 and formation of methane and aromatics occur at > 700°C. (C): hard semi-coke starts shrinking at 600°C. (D): all , and .
34016. Which of the following petrological constitutes is responsible for bright and lustrous black band of bituminous coal ?
(A): Vitrain (B): Clarain (C): Durain (D): Fussain
34017. Broad System of Ordering is a classification system or switching language developed by:
(A): UNESCO (B): UNISIST (C): UN (D): ISO
34018. White flue gas (resembling steam) coming out of the chimney of a thermal power plant indicates that the fuel used in the boiler furnace is
(A): tar (B): coke oven gas (C): pitch (D): pulverised coke
34019. Too much of excess air in combustion results in high
(A): fuel consumption for the same heat load. (B): stack gas temperature. (C): percentage of oxygen in flue gases. (D): all , and .
34020. A fuel with high heat release rate will
(A): require smaller combustion chamber. (B): have high calorific value. (C): have high adiabatic flame temperature. (D): none of these.
34021. Coke compared to the coal from which it has been made, contains
(A): less volatile matter. (B): more carbon. (C): greater percentage of ash. (D): all , and .
34022. A gaseous fuel in order to develop luminousity on burning, must contain
(A): carbon monoxide (B): hydrocarbons (C): hydrogen (D): oxygen
34023. Nitrogen present in the flue gas is determined in the orsat apparatus by absorbing it in
(A): KOH (B): ammoniacal cuprous chloride (C): pyrogallol solution (D): none of these
34024. The lowest temperature, at which a solid fuel produces enough vapors to support continuous combustion, is called
(A): fire point (B): smoke point (C): burning temperature (D): kindling temperature
34025. A coal having high volatile matter content will
(A): give less yield of tar and gas on carbonisation. (B): burn with a small non-smoky flame. (C): have a very high calorific value. (D): none of these.
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