Mechanical Engineering MCQs

Page No. 7

The steam temperature with increase in load in case of a boiler fitted with radiation super heater________________?


aincreases


bdecreases


cremains unaffected


dfirst increases and then decreases


View Answer decreases

A supercritical boiler is one that operates above the pressure and temperature of following values_____________________?


a100 kg/cm2 and 540°C


b1 kg/cm2 and 100°C


c218 kg/cm2 abs and 373°C


d218 kg/cm2 abs and 540°C



Maximum energy loss in a boiler occurs due to _______________________?


aunburnt carbon in ash


bincomplete combustion


cash content


dflue gases


View Answer flue gases

The balanced draft furnace is one using _________________________?


ainduced draft fan and chimney


binduced draft fan and forced draft fan


cforced draft fan and chimney


dany one of the above



Evaporative capacity of boiler is expressed as____________________?


akg of steam produced


bsteam pressure produced


ckg of fuel fired


dkg of steam produced per kg of fuel fifed



Pulverized fuel is used for___________________?


abetter burning


bmore calorific value


cless radiation loss


dmedium sized units


View Answer better burning

Incomplete combustion can be best judged by__________________?


asmoky chimney exit


bexcess air in flue gases


cmeasuring carbon mono-oxide in flue gases


dmeasuring temperature of flue gases at exit of furnace



Heating value of fuel used is as on fired basis. If it is reported for dry or moisture free fuel, then latter should be multiplied by the following factor to correct for as fired value ___________________?


a(1- moisture content)


b(1 + moisture content)


c1 + moisture content


d1 – moisture content


View Answer (1- moisture content)

Tertiary air is the air used to____________________?


aprovide air around burners for obtaining optimum combustion


btransport and dry the coal


ccool the scanners


dconvert CO (formed in lower zone of furnace) into C02 at higher zone



The ultimate 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



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