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MCQs 1: Gardually increasing temperature of flue gases at inlet to chimney for given steam outputs is an indication of__________________?

higher effectiveness of boiler high calorific value coal being burnt fouling of heat transfer surfaces raising of steam temperature leakage of air
Answer Explanation

MCQs 2: The three “Ts” for good combustion are____________________?

temperature, time, and turbulance total air, true fuel, and turbulance thorough mixing, total air, and temperature total air, time, and temperature none of the above
Answer Explanation

MCQs 3: The safety valve on boiler drum compared to safety valve on super heater is set at ________________?

same value higher value lower value lower/higher depending on steam flow unpredicatble
Answer Explanation

MCQs 4: The proximate analysis of fuel lists__________________?

various chemical constituents, carbon, hydrogen, oxygen etc, plus ash as per-cents by volume various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as per-cents by weight fuel constituents as percents by volume of moisture, volatile, fixed carbon and ash fuel constituents as percents by weight of moisture, volatile, fixed carbon and ash moisture and ash free heating value
Answer Explanation

MCQs 5: Green coal, in order to be burnt, must be____________________?

heated sufficiently burnt in excess air heated to its ignition point burnt as powder burnt as lumps
Answer Explanation

MCQs 6: Sulphur in coal results in___________________?

causing clinkering and slagging corroding air heaters spontaneous combustion during coal storage facilitating ash precipitation all of the above
Answer Explanation

MCQs 7: The behaviour of coal in a furnace is determained by_______________________?

the content of sulphur the content of ash and heating value the proximate analysis the exact analysis its type
Answer Explanation

MCQs 8: Pour point of fuel oil is the____________________?

lowest temperature at which oil will flow under set condition storage temperature temperature at which fuel is pumped through burners temperature at which oil is transported none of the above
Answer Explanation

MCQs 9: Gusset stays in a boiler are provided to____________________?

prevent the bulging of flat surfaces avoid explosion in furnace prevent leakage of hot flue gases support furnace freely from top prevent atmospheric air leaking into furnace
Answer Explanation

MCQs 10: Sulphur content of fuels is very important to the plant operators because it____________________?

has high heating value retards electric precipitation promotes complete combustion has highly corrosive effect facilitates ash removal
Answer Explanation

MCQs 11: An economiser in a boiler______________________?

increases steam pressure increases steam flow decreases fuel consumption decreases steam pressure increases life of boiler
Answer Explanation

MCQs 12: Spontaneous combustion is a phenomenon in which____________________?

all the fuel burns instantaneously producing high energy release fuel burns with less air coal bursts into flame without any external ignition source but by itself due to gradual increase in temperature as a result of heat released by combi explosion in furnace none of the above
Answer Explanation

MCQs 13: Ultimate analysis of fuel is determination of percentage of____________________?

carbon, hydrogen, nitrogen, sulphur, moisture fixed carbon, ash, volatile matter, moisture higher calorific value lower calorific value best analysis
Answer Explanation

MCQs 14: Which device is used in thermal power plants to reduce level of pollution___________________?

induced draft fan smoke meter chimney precipitator pulveriser
Answer Explanation

MCQs 15: The maximum discharge through a chimney occurs when the height of chimney is_____________________?

infinitely long around 200 meters equal to the height of the hot gas column producing draught outside temperature is very low more than the tallest building nearby
Answer Explanation

MCQs 16: In locomotives, the draught is produced by_________________?

chimney induced draft fan both combined A. and B. steam jet draught none of the above
Answer Explanation

MCQs 17: Vacuum for reciprocating steam engines compared to steam turbines is__________________?

more equal less could be more or less depending on the size of plant none of the above
Answer Explanation

MCQs 18: The height of chimney in a power plant is governed by__________________?

the draft to be created limitation of construction facilities control of pollution quantity of flue gases to be handled all of the above
Answer Explanation

MCQs 19: The function of injector used in small capacity boilers is to____________________?

create vacuum inject chemical solution in feed pump pump water, similar to boiler feed pump add make up water in the system none of the above
Answer Explanation

MCQs 20: In designing air preheater, the important design consideration is that_________________?

approach temperature should be as low as possible handling and maintenance should be easier heat transfer area should be optimum stack gases should not be cooled to the dew point none of the above
Answer Explanation

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