Mechanical Engineering MCQs

Page No. 4

Spontaneous combustion is a phenomenon in which____________________?


aall the fuel burns instantaneously producing high energy release

✖


bfuel burns with less air

✖


ccoal bursts into flame without any external ignition source but by itself due to gradual increase in temperature as a result of heat released by combination of oxygen with coal

✓


dexplosion in furnace

✖



An economiser in a boiler______________________?


aincreases steam pressure

✖


bincreases steam flow

✖


cdecreases fuel consumption

✓


ddecreases steam pressure

✖



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


ahas high heating value

✖


bretards electric precipitation

✖


cpromotes complete combustion

✖


dhas highly corrosive effect

✓



Gusset stays in a boiler are provided to____________________?


aprevent the bulging of flat surfaces

✓


bavoid explosion in furnace

✖


cprevent leakage of hot flue gases

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dsupport furnace freely from top

✖



Pour point of fuel oil is the____________________?


alowest temperature at which oil will flow under set condition

✓


bstorage temperature

✖


ctemperature at which fuel is pumped through burners

✖


dtemperature at which oil is transported

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The behaviour of coal in a furnace is determained by_______________________?


athe content of sulphur

✖


bthe content of ash and heating value

✖


cthe proximate analysis

✓


dthe exact analysis

✖



Sulphur in coal results in___________________?


acausing clinkering and slagging

✖


bcorroding air heaters

✖


cspontaneous combustion during coal storage

✖


dall of the above

✓


View Answer all of the above

Green coal, in order to be burnt, must be____________________?


aheated sufficiently

✖


bburnt in excess air

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cheated to its ignition point

✓


dburnt as powder

✖



The proximate analysis of fuel lists__________________?


avarious chemical constituents, carbon, hydrogen, oxygen etc, plus ash as per-cents by volume

✖


bvarious chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as per-cents by weight

✖


cfuel constituents as percents by volume of moisture, volatile, fixed carbon and ash

✖


dfuel constituents as percents by weight of moisture, volatile, fixed carbon and ash

✓



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


asame value

✖


bhigher value

✓


clower value

✖


dlower/higher depending on steam flow

✖


View Answer higher value

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