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


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



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


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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