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You Are On Multi Choice Question Bank SET 679
33951. A coal having higher volatile matter content, has lower
(A): smoking tendency on burning. (B): coke oven gas yield on carbonisation. (C): chance of catching fire during storage in open space. (D): ignition temperature.
33952. Weathering of coal during storage causes
(A): reduction in coal size. (B): increase in its friability. (C): decrease in its caking capacity. (D): all , and .
33953. With increase in the temperature of carbonisation of coal
(A): hydrogen content of coke oven gas increases due to cracking of hydrocarbons. (B): methane content in the coke oven gas decreases and carbon monoxide content increases. (C): calorific value of the coke oven gas decreases due to cracking of hydrocarbons which is not compensated by increase in CO & H2 content. (D): all , and
33954. The calorific value of natural gas is about __________ kcal/Nm3.
(A): 10, 000 (B): 2500 (C): 25, 000 (D): 35, 000
33955. Thrishna is a CDS/ISIS based software developed by:
(A): UGC (B): INSDOC (C): NISSAT (D): CSIR
33956. Critical Air Blast (CAB) value of coke is a direct measure of its
(A): reactivity (B): hardness (C): strength (D): none of these
33957. The function of secondary combustion air is to
(A): pneumatically convey the pulverised coal. (B): completely burn the volatile matter. (C): burn the lumpy coal. (D): none of these.
33958. The ratio of maximum adiabatic flame temperature in air to that in pure oxygen is always
(A): 1 (B): <1 (C): > 1 (D): unpredicatable
33959. Fixed carbon in coal is defined as
(A): that present in volatile matters. (B): the total quantity of carbon present in the coal. (C): hundred minus the percentage of volatile matter, ash and moisture. (D): the one which is present in the residue after combustion.
33960. Which of the following fuels has the highest calorific value per unit mass (kcal/kg) ?
(A): Coal (B): Kerosene (C): Natural gas (D): Furnace oil
33961. With increase in the time of carbonisation at a particular temperature (say 1000°C), the __________ percentage in coke oven gas increases.
(A): hydrogen (B): methane (C): unsaturated hydrocarbons (D): all , and
33962. During its calorific value determination by bomb calorimeter, coal is combusted by
(A): air (B): oxygen (C): oxygen enriched air (D): none of these
33963. Abel apparatus is used for those oils, whose flash points are___°F.
(A): <120 (B): >120 (C): >280 (D): 300-600
33964. Oxygen required for theoretically complete combustion of 1 Nm3 methane is __________ Nm3.
(A): 2 (B): 4 (C): 6 (D): 1
33965. Bomb calorimeter is used for the determination of calorific value of the __________ fuels.
(A): gaseous (B): solid (C): liquid (D): both and
33966. As the C/H ratio of the fuel increases, the amount of CO2 formed on combustion __________ for the same percentage of excess air.
(A): decreases (B): increases (C): remains same (D): may increase or decrease depending on the type of fuel
33967. Which of the following fuel gases has the highest calorific value ?
(A): Natural gas. (B): Coal bed methane (CBM). (C): Liquefied petroleum gas (LPG). (D): Sewage gas.
33968. Calorific value as determined by bomb calorimeter is the
(A): higher calorific value at constant volume. (B): gross calorific value at constant pressure. (C): lower calorific value at constant pressure. (D): net calorific value at constant volume.
33969. Which of the following can be made into briquettes without the use of a binder ?
(A): lignite (B): Bituminous coal (C): Anthracite coal (D): None of these
33970. As the equilibrium moisture content of the coal increases, its
(A): calorific value increases. (B): swelling number decreases. (C): swelling number increases. (D): bulk density decreases.
33971. Which of the following is a measure of the agglutinating (i.e., binding) property of coal?
(A): Thickness of plastic layer (B): Caking index (C): Swelling index (D): Gray-king index
33972. During coal carbonisation process, the conversion of semi-coke to coke is accompanied by an increase in the __________ of the mass.
(A): density (B): porosity (C): electrical resistivity (D): none of these
33973. Blast furnace gas burns with a bluish flame, because of the presence of
(A): CO (B): CH4 (C): CO2 (D): S
33974. Which of the following is not a by-product fuel?
(A): Producer gas (B): Blast furnace gas (C): Coke oven gas (D): Refinery gas
33975. Lignite is
(A): a high rank coal. (B): a coking coal. (C): can be used for gasification and steam generation. (D): a black banded coal which burns with a non-smoky yellowish flame.
33976. Shatter index of metallurgical coke on 2 inches and 0.5 inch screen should be respectively around __________ percent.
(A): 80 and 97 (B): 95 and 100 (C): 40 and 70 (D): 25 and 97
33977. Naphthalene recovered from coke oven gas is used
(A): as moisture proof coating on fibres. (B): as moth balls (insecticides). (C): as a fuel in furnaces. (D): for making electrodes.
33978. Method of maintaining fires in furnace during standby periods without undue consumption of fuel is called
(A): back draughting. (B): banking. (C): under pressurising. (D): none of these.
33979. Quantity of coke produced from metallurgical coal may be around __________ percent.
(A): 30 (B): 50 (C): 75 (D): 95
33980. Coal is heated in presence of air to a temperature of about __________ °C, while determining its ash content for proximate analysis.
(A): 500 (B): 750 (C): 950 (D): 1100
33981. Out of the following fuels, the difference between gross and net calorific value will be minimum in case of
(A): coke oven gas (B): water gas (C): natural gas (D): blast furnace gas
33982. Fuel for a fast breeder nuclear reactor is
(A): plutonium (B): uranium (C): radium (D): neptunium
33983. Which of the following gaseous fuels is likely to have the highest gross calorific value?
(A): Sewage gas (B): LPG (C): Producer gas (D): Natural gas
33984. Which of the following is called "blue gas" ?
(A): coke oven gas (B): water gas (C): natural gas (D): producer gas
33985. Caking index of a coal is a measure of its
(A): abradability (B): reactivity (C): agglutinating (binding) properties (D): porosity
33986. Calorific value of furnace oil is about __________ Kcal/kg.
(A): 10000 (B): 15000 (C): 5000 (D): 20000
33987. Universal Decimal Classification(UDC)is an example of:
(A): Freely faceted scheme (B): Almost freely faceted scheme (C): Almost enumerative scheme (D): Almost faceted scheme
33988. Which one of the following is an open source library software?
(A): Libsys (B): SOUL (C): CDS/ISIS (D): KOHA
33989. Removal of hydrogen from coke oven gas
(A): increases its calorific value. (B): decreases its calorific value. (C): does not alter its calorific value. (D): is not possible on commerical scale.
33990. If oxygen content in the flue gas rises too high, fuel is being wasted by
(A): incomplete combustion. (B): dry gas/stack gas loss. (C): moisture loss. (D): none of these.
33991. Increase in ash content of blast furnace coke
(A): reduces its consumption in the furnace. (B): increases its consumption in the furnace. (C): does not affect its consumption in the furnace. (D): decreases its hardness and abrasion resistance.
33992. Safe condition for storage of high V.M. bituminous coal is that
(A): height of the coal heap should be < 3 metres. (B): maximum 200 tons should be stored in a heap. (C): both and . (D): neither nor .
33993. Ignition temperature of a fuel in air is __________ that in pure oxygen.
(A): more than (B): less than (C): equal to (D): either more or less; depends on the type of fuel
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