Online Chemical Engineering Test - Fuels and Combustion Test

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Total number of questions: 20.
Time allotted: 30 minutes.
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Which of the following constituents of coal is the most important in the production of coke?

Moisture

Ash

Volatiles

Carbon

[#]

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

Phenol & naphthalene

Benzol & pitch

Anthracene & creosote

None of these

[#]

Ratio of primary air to secondary air increases with increase in the rank of coal, because the

high rank coals have higher amount of volatile matter.

ratio of fixed carbon to volatile matter increases.

oxygen content progressively decreases.

calorific value of the coal increases.

[#]

The sequence of absorption in flue gas analysis by Orsat's apparatus is respectively

CO₂, O₂, CO

CO, O₂, CO₂

CO₂, CO, O₂

O₂, CO₂, CO

[#]

Spontaneous combustion of coal on storage results due to

inadequate ventilation.

low temperature oxidation.

storage in large heaps with small surface to volume ratio.

all (a), (b)and (c).

[#]

Artificial draught produced by a fan can be controlled by the

speed of the fan.

damper.

variation in the pitch of the fan blades.

all (a), (b)and(c).

[#]

Coke having higher porosity has

lower bulk density.

lower strength.

higher reactivity.

all (a), (b) and (c).

[#]

Supply of excess air for complete combustion of fuel is necessitated to facilitate

its thorough mixing with air.

attainment of chemical equilibrium.

attainment of high temperature.

none of these.

[#]

Highly reactive coke have lower

porosity.

coke reactivity index (CRI).

Critical air blast (CAB) value.

both (b) and (c).

[#]

10.

Gasification of the solid fuel converts its organic part into combustible by interaction with air/oxygen and steam so as to obtain a secondary gaseous fuel of high calorific value having no ash. Gasification reactions are normally carried out at about __________ °C.

400-500

900-1000

1400-1500

1700-1800

[#]

11.

Which of the following constituents of a fuel does not contribute to its calorific value on combustion ?

Hydrogen

Sulphur

Carbon

None of these

[#]

12.

Cannel coal

is non-coking.

has a high volatile matter content and burns with a luminous smoky flame.

is a non-banded coal which can be ignited easily with a match stick or candle flame, hence is so named.

all (a), (b) and (c).

[#]

13.

Heat penetration rate in narrow coke ovens in high temperature carbonisation of coal is around __________ cm/hr.

2.5

0.5

[#]

14.

Ignition temperature decreases progressively from anthracite to lignite, because

volatile matter content increases.

carbon content decreases.

moisture content increases.

ash content increases.

[#]

15.

Correct viscosity of furnace oil at the burner tip for proper atomisation is about 25 centistokes. To reduce the viscosity of high viscosity furnace oil (250 centistokes) to the correct atomisation viscosity (i.e. 25 cst), it should be preheated to about____°C.

105

145

[#]

16.

C/H ratio is the maximum in case of

coal

furnace oil

natural gas

naphtha

[#]

17.

Calorific value of wood gas is about __________ kcal/Nm³.

1500

3300

5400

8500

[#]

18.

Pick out the wrong statement.

Main constituents of LPG are propane and butane.

C.V. of natural gas is about 10000 KCal/Nm³.

C.V. of LPG is about 26000 kcal/Nm³(11500 kcal/kg).

L.P.G. is lighter than air.

[#]

19.

Fusion point of coal ash increases with increase in its __________ content.

iron sulphate

iron silicate

lime and magnesia

all (a), (b) and (c)

[#]

20.

Washing of coal decreases its

caking index.

mineral matter content.

ash content.

both (b) and (c).

[#]

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Online Chemical Engineering Test - Fuels and Combustion Test

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