A Best Way To Crack Gorenment Job Exams

Fuels and Combustion MCQs

Chemical Engineering Objective Questions

Home / Chemical Engineering / Fuels and Combustion



435. Which of the following gaseous fuels has the lowest calorific value?
A. Gobar gas
B. Refinery gas
C. Converter gas
D. Blast furnace gas
Discussion
436. As the C/H ratio of the fuel increases, the amount of CO2 formed on combustion __________ for the same percentage of excess air.
A. Decreases
B. Increases
C. Remains same
D. May increase or decrease depending on the type of fuel
Discussion
437. Which of the following would require least amount of secondary air for combustion?
A. Coke breeze containing 25% ash and 2% volatile matter
B. Anthracite containing 10% volatile matter and 8% ash
C. Bituminous coal containing 20% ash and 25% volatile matter
D. Semi-bituminous coal containing 25% ash and 20% volatile matter
Discussion
438. The function of secondary combustion air is to
A. Pneumatically convey the pulverised coal
B. Completely burn the volatile matter
C. Burn the lumpy coal
D. None of these
Discussion
439. KOH solution used in orsat apparatus absorbs
A. CO2
B. SO2
C. Both A & B
D. Neither A nor B
Discussion
440. When the coal is heated in absence of air, it is called its
A. Deoxidation
B. Gasification
C. Coalification
D. Carbonisation
Discussion
441. During combustion of gaseous fuels, deficiency of air
A. Lengthens the flame
B. Tends to shorten the flame
C. Does not affect the flame length
D. Increases the flame temperature
Discussion

Page 63 of 72

« 61 62  63  6465 »