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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