Chemical Engineering - Fuels and Combustion

6. 

Softening temperature of coal ash is a measure of the __________ of coal.

A. caking tendency
B. coking tendency
C. clinkering tendency
D. size stability

Answer: Option C

Explanation:

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7. 

A fuel containing carbon and carbon monoxide (but containing no hydrogen or its compounds) is burnt in pure oxygen at constant pressure. Its gross calorific value as compared to net calorific value will be

A. more
B. less
C. same
D. data insufficient; can't be predicted.

Answer: Option C

Explanation:

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8. 

Presence of phosphorous in metallurgical coal

A. is not undersirable.
B. reduces its calorific value.
C. badly affects the quality of steel.
D. increases its caking power.

Answer: Option C

Explanation:

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9. 

Initial pressure of oxygen introduced into the 'bomb' of the bomb calorimeter for determination of calorific value of coal/fuel oil may be around __________ atm.

A. 3-5
B. 25-30
C. 60-65
D. 95-100

Answer: Option B

Explanation:

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10. 

'Fat' coal means a coal having

A. low calorific value.
B. high volatile matter,
C. low ash content.
D. non smoking tendency.

Answer: Option B

Explanation:

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