Chemical Engineering - Fuels and Combustion

1. 

The calorific value of natural gas is about __________ kcal/Nm3.

A. 10, 000
B. 2500
C. 25, 000
D. 35, 000

Answer: Option A

Explanation:

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2. 

Low temperature carbonisation of coal takes place at __________ °C.

A. 300
B. 1100
C. 700
D. 150

Answer: Option C

Explanation:

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3. 

Critical Air Blast (CAB) value of coke is a direct measure of its

A. reactivity
B. hardness
C. strength
D. none of these

Answer: Option A

Explanation:

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4. 

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.

Answer: Option B

Explanation:

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5. 

The ratio of maximum adiabatic flame temperature in air to that in pure oxygen is always

A. 1
B. <1
C. > 1
D. unpredicatable

Answer: Option B

Explanation:

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