Go To Top Reset
<<= Back
Next =>>
You Are On Multi Choice Question Bank SET 676
33801. Percentage of carbon monoxide in blast furnace gas may be around
(A): 8 (B): 14 (C): 22 (D): 52
33802. The main drawback of supplying more excess air in the combustion of fuel is the
(A): excessive power requirement of air blower. (B): enhanced sensible heat loss in the flue gas. (C): intermittant and uncontrolled combustion of the fuel. (D): high exit flue gas temperature from the furnace.
33803. Width of the coke oven towards coke side is slightly more than that on pusher side to
(A): facilitate easy discharging of coke as it swells during carbonisation. (B): facilitate uniform heating of the oven. (C): increase the output of the coke. (D): none of these.
33804. __________ process is meant for direct hydrogenation of coal to produce liquid fuel.
(A): Fischer-Tropsch (B): Bergius (C): Lurgi (D): None of these
33805. Producer gas containing least amount of tar is produced by the
(A): partial combustion of coal. (B): partial combustion of large size (< 50 mm) coke. (C): high pressure gasification of coal (e.g. in Lurgi gasifier). (D): atmospheric pressure gasification of coal (e.g., in Kopper-Totzek gasifier).
33806. Air/gas ratio for complete combustion will be the highest for
(A): LPG (B): gobar gas (C): coke oven gas (D): carburetted water gas
33807. Beehive coke oven
(A): facilitates by-products recovery. (B): takes 2-3 days for coking of coal but requires no external fuel for heating. (C): gives larger yield of coke (around 85%) as compared to by-product ovens. (D): produces coke with very poor strength.
33808. Turndown ratio of a gas burner is equal to the
(A): maximum to minimum heat input ratio. (B): maximum to minimum permissible gas flow rate. (C): both & . (D): minimum to maximum heat input ratio.
33809. Which of the following fuels is generally not used in thermal power plant boiler firing?
(A): Furnace oil, light diesel oil and tar/PCM. (B): Pulverised coking coal. (C): Coal middling from washeries. (D): B.F. gas, coke oven gas and L.D. converter gas.
33810. A sooty flame can be made non-luminous by
(A): admitting more gas. (B): shutting gas supply. (C): admitting more air. (D): shutting air supply.
33811. A coal that softens and fuses on heating is
(A): classified (B): carbonised (C): caking (D): non-caking
33812. Which of the following reactions occuring during coal gasification is called the Neumann reversal reaction ?
(A): 2CO C + CO2 (B): CO + H2O CO2 + H2 (C): C + H2O CO + H2 (D): C + 2H2O CO2 + 2H2
33813. 'Mixed gas' used in steel plants is a mixture of
(A): B.F. gas and coke oven gas. (B): coke oven gas and converter gas. (C): coke oven gas and L.P.G. (D): blast furnace gas and naphtha vapor.
33814. Orsat apparatus is meant for
(A): gravimetric analysis of flue gas. (B): finding out combustion efficiency. (C): direct determination of nitrogen in flue gas by absorbing it in ammoniacal cuprous chloride. (D): none of these.
33815. Library and Information Science Abstract(LISA)is published by:
(A): The British Library (B): The Library Association (C): American Library Association (D): Library of Congress
33816. 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 and .
33817. Assam coals suffers mainly from the disadvantage of high __________ content.
(A): ash (B): volatile matter (C): sulphur (4-6%) (D): moisture
33818. 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 , and .
33819. In high temperature carbonisation (as compared to low temperature carbonisation) of coal
(A): coke oven gas yield is more. (B): tar yield is less but free carbon in tar is more. (C): calorific value of coke oven gas is less. (D): all , , and .
33820. Anthracite coal
(A): contains more volatile matter than bituminous coal. (B): ignites more easily than bituminous coal. (C): is essentially a coking coal. (D): burns with short, bluish, yellow-tipped flame producing very little smoke.
33821. Number of macrocomponents present in coal according to Stopes are
(A): four (B): five (C): six (D): two
33822. The maximum adiabatic flame temperature in air as compared to that in pure oxygen is
(A): much lower. (B): much higher. (C): same. (D): either lower or higher, depends on the type of fuel.
33823. Yield of charcoal in high temperature carbonisation of wood is about __________ percent.
(A): 10 (B): 25 (C): 50 (D): 75
33824. International Serial Data System(ISDS)is an information centre developed by:
(A): UNISIST (B): FID (C): IFLA (D): LC
33825. Preheating of a gaseous fuel results in increased
(A): flame length (B): flame temperature (C): quantity of flue gas (D): ignition temperature
33826. Eschka mixture, which is used for the determination of sulphur in coal, is a mixture of
(A): MgO & Na2CO3 (B): MgSO4 & BaCl2 (C): BaSO4 & NaCl (D): MgCO3 & NaCl
33827. Fossil fuels mean
(A): solid fuels (B): liquid fuels (C): those fuels which are found in the crust of earth. (D): premature fuels with low calorific value.
33828. Sometimes water is sprayed during coal charging in the coke oven, which helps in
(A): prevention of clinker formation in the oven. (B): controlling the dust nuisance while charging the coal. (C): reducing the cracking of hydrocarbons in the gas and increasing the percentage of CO & H2 in the gas (due to the endothermic reaction represented by C + H2O = CO + H2) (D): all , and .
33829. Which of the following is not a binder for coal briquetting ?
(A): Coal tar (B): Bitumen (C): Molasses (D): None of these
33830. The liquid used for the washing of coal in an industrial coal washery is a mixture of water and
(A): carbon tetrachloride. (B): sand (40%). (C): mineral oil of high viscosity & specific gravity (1.6) (D): none of these.
33831. Spontaneous combustion of coal on storage results due to
(A): inadequate ventilation. (B): low temperature oxidation. (C): storage in large heaps with small surface to volume ratio. (D): all , and .
33832. LibQual is a tool for measuring library service quality developed by:
(A): The British Library (B): Library of Congress (C): American Library Association (D): Association of Research Libraries
33833. Which of the following is the most poisonous gas ?
(A): Coke oven gas (B): Producer gas (C): Blast furnace gas (D): L.D. converter gas
33834. Volatile matter content of metallurgical coke may be around __________ percent.
(A): 1-2 (B): 10-15 (C): 22-26 (D): 30-33
33835. Calorific value of bituminous coal may be around __________ Kcal/kg.
(A): 500 (B): 1500 (C): 6500 (D): 20000
33836. Gobar gas is produced by the __________ of cown dung.
(A): fermentation (B): oxidation (C): hydrogenation (D): none of these
33837. In Orsat's apparatus, ammoniacal cuprous chloride is used for selectivity absorbing
(A): CO (B): CO2 (C): O2 (D): H2O
33838. LIS Forum is an email discussion forum run by:
(A): Indian Institute of Science,Bangalore (B): SNDT Womens University,Lucknow (C): Indian Institute of Technology,Chennai (D): Indian Institute of Management,Calcutta
33839. Which of the following coke has the least percentage of ash ?
(A): Petroleum coke (B): Beehive coke (C): Foundary coke (D): Metallurgical coke
33840. Soft coke is not
(A): produced by low temperature carbonisation of coal. (B): a domestic fuel. (C): used in blast furnaces. (D): none of these.
33841. Mineral matter, 'M' and ash percentage 'A' in coal are roughly related as
(A): M = 1.8 A (B): M = 0.5 A (C): M = 1.1 A (D): M = A
33842. Blast furnace gas constitutes mainly of
(A): N2 & CH4 (B): N2 & H2 (C): N2 & CO (D): CH4 & CO2
33843. A good coking coal should have high __________ content.
(A): ash (B): sulphur & phosphorus (C): moisture (D): none of these
33844. In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of
(A): transportation of coal. (B): drying of coal. (C): combustion of coal by supplying it around the burner. (D): preheating the primary air.
33845. Largest constituent of coke oven gas is
(A): N2 (B): H2 (C): CH4 (D): CO2
33846. Fussain
(A): is friable, charcoal like substance. (B): has highest fixed carbon and lowest volatile matter content of all the four banded components of coal. (C): is non-coking, but when blended with highly coking coal, controls its swelling and produces high strength coke on carbonisation. (D): all , and .
33847. Producer gas comprises mainly of
(A): CO & N2 (B): CO & H2 (C): CO2 & N2 (D): CO2 & H2
33848. In high temperature carbonisation (as compared to low temperature carbonisation) of coal, the
(A): gas yield is less. (B): tar yield is more. (C): ignition temperature of coke produced is less. (D): aromatic content of tar produced is more.
33849. Calorific value of pitch creosote mixture (PCM) i.e., C.T.F.-200 is about
(A): 8800 kcal/m3 (B): 8800 kcal/kg (C): same as that of coal middling (D): 25000 kcal/kg
33850. 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.
<<= Back
Next =>>
Terms And Service:We do not guarantee the accuracy of available data ..We Provide Information On Public Data.. Please consult an expert before using this data for commercial or personal use
Powered By:Omega Web SolutionsPrivacy | Terms And Conditions
Powered By:Omega Web Solutions