⚙️Mechanical Engineering MCQs
Mechanical Engineering MCQs
488 MCQs431
The relative heat absorption for successively added equal areas of boiler convection heating surfaces____________________?
Aincreases
Bdecreases
Cremains unaffected
Dfirst increases and then decreases E. first decreases and then increases
432
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 E. unpredictable
433
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 E. 100 kg/cm2 abs and 373°C
434
Maximum energy loss in a boiler occurs due to _______________________?
Aunburnt carbon in ash
Bincomplete combustion
Cash content
Dflue gases E. radiation losses
435
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 E. none of the above
436
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 E. kg of water evaporated
437
Pulverized fuel is used for___________________?
Abetter burning
Bmore calorific value
Cless radiation loss
Dmedium sized units E. stoker fired boilers
438
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 E. measuring oxygen in flue gases
439
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
440
The basic job of feed water treatment in boilers is to overcome the problem of __________________?
Acorrosion
Bscale
Ccarryover
Dembrittlement E. all of the above