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Fuels and Combustion

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

0.5
2.5
10
20

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Fuels and Combustion
Eschka mixture, which is used for the determination of sulphur in coal, is a mixture of

MgO & Na₂CO₃
MgCO₃ & NaCl
MgSO₄ & BaCl₂
BaSO₄ & NaCl

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Fuels and Combustion
One kg of carbon for theoretically complete combustion requires __________ kg of air.

23
12
0.5
11.5

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Fuels and Combustion
A travelling grate stoker is meant for the efficient burning of __________ coal.

Caking
Non-caking
Pulverised
High ash

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Fuels and Combustion
Higher percentage of ash in coal meant for the production of metallurgical grade coke

Decreases the hardness of coke
None of these
Decreases the abrasion resistance of coke
Causes brittleness in steel

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Fuels and Combustion
Soft coke is not

Used in blast furnaces
None of these
A domestic fuel
Produced by low temperature carbonisation of coal

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