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Fuels And Combustion Online Exam Quiz

Important questions about Fuels And Combustion. Fuels And Combustion MCQ questions with answers. Fuels And Combustion exam questions and answers for students and interviews.

1. The gas which contributes maximum to the heating value of natural gas is


A : CO

B : CO 2

C : H 2

D : CH 4

2. Low temperature carbonisation


A : is mainly for producing the smokeless domestic coke.

B : is meant for the production of 'metallurgical coke'.

C : produces higher quantity of gas than high temperature carbonisation.

D : produces less quantity of tar than high temperature carbonisation.

3. Presence of free moisture in coal during its high temperature carbonisation


A : reduces the coking time.

B : protects the volatile products from pyrolysis (cracking) in the presence of hot coke and hot oven walls.

C : increases the loss of fine coal dust from the ovens when charging.

D : none of these.

4. Natural draught produced by a chimney depends upon the


A : density of the chimney gases.

B : height of the chimney.

C : both (a) and (b).

D : neither (a) nor (b).

5. Calorific value of coal middling generated in coal washeries during washing of coal may be around __________ Kcal/kg.


A : 1000

B : 4000

C : 6000

D : 8000

6. Fuel gases containing hydrocarbons (ie.g. coke oven gas) are not preheated before burning, mainly because


A : the hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot.

B : it reduces its calorific value tremendously.

C : it reduces its flame temperature tremendously.

D : there are chances of explosion during preheating.

7. Which of the following is the most reactive (as regards the formation of CO + H 2 from C + H 2 O)?


A : Blast furnace coke

B : Low temperature coke

C : Anthracite coal

D : Sub-bituminous coal

8. Which of the following is not a product of tar distillation?


A : Phenol & naphthalene

B : Benzol & pitch

C : Anthracene & creosote

D : None of these

9. Presence of __________ in a dry gaseous fuel does not contribute to its calorific value.


A : sulphur

B : oxygen

C : hydrogen

D : carbon

10. A coal containing very high percentage of durain is called __________ coal.


A : bright

B : splint

C : non-banded

D : boghead

1. Which of the following is not a by-product recovered in a high temperature coal carbonisation plant?


A : Benzol

B : Pitch-cresosote mixture (PCM)

C : Napthalene

D : Ethylene

2. Combustion reaction of fuels is a/an __________ reaction.


A : auto catalytic

B : exothermic

C : endothermic

D : none of these

3. Higher efficiency in the combustion of solid fuel can not be achieved by


A : proper fuel preparation.

B : keeping the flue gas exhaust temperature very high.

C : adopting efficient-fuel firing technique & equipment.

D : supplying correct quantity of combustion air.

4. High temperature in gasification of coal favours


A : high production of CO 2 .

B : low production of CO 2 .

C : high production of CO.

D : both (b) and (c).

5. Which of the following is used for making the explosive 'TNT'?


A : Benzol

B : Toluene

C : Pyridine

D : Cerosote

6. Gray King Assay and Swelling Index of a coal is a measure of its


A : swelling characteristics.

B : abradability.

C : agglutinating properties.

D : resistance to impact breakage.

7. Junker's calorimeter is used to determine the calorific value of


A : pulverised coal

B : gaseous fuels

C : fuel oil

D : none of these

8. Which of the following accentuates clinker-ing trouble on furnace grate burning coal?


A : Low reactivity of carbonised residue containing high proportions of iron & sulphur.

B : Low forced draught and fuel bed temperature.

C : Thick fire bed and preheated primary air.

D : All (a), (b) and (c).

9. Explosion limit of blast furnace gas is 37 to 71% gas in gas-air mixture. It means that the blast furnace gas will explode when burnt in a confined space, if its concentration in the gas-air mixture is __________ percent.


A : < 37%

B : >71%

C : in between 37 & 71%

D : none of these

10. Actual flame temperature is always lower than the adiabatic flame temperature, because there is


A : no possibility of obtaining complete combustion at high temperature.

B : always loss of heat from the flame.

C : both (a) and (b).

D : neither (a) nor (b).

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