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Question: Calorific value of dry wood may be around __________ Kcal/kg.
[A].

5

[B].

50

[C].

500

[D].

5000

Answer: Option A

Explanation:

No answer description available for this question.

Question: If the specific heat of gaseous products of combustion of a fuel is high, the abiabatic flame temperature will be
[A].

low

[B].

high

[C].

very high, if the fuel is of low calorific value

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.

Question: Grindability index of a coal is 100. It implies that the
[A].

coal can be pulverised with great difficulty.

[B].

coal can’t be pulverised.

[C].

coal can be easily pulverised.

[D].

power consumption in grinding the coal will be very high.

Answer: Option C

Explanation:

No answer description available for this question.

Question: With increase in calorific value of fuels, their adiabatic flame temperatures
[A].

increase

[B].

decrease

[C].

remain unchanged

[D].

may increase or decrease ; depends on the quantity of products of combustion

Answer: Option D

Explanation:

No answer description available for this question.

Question: 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:

No answer description available for this question.

Question: Adiabatic flame temperature of a fuel is dependent on the initial temperature of
[A].

fuel

[B].

air

[C].

both (a) & (b)

[D].

neither (a) nor (b)

Answer: Option C

Explanation:

No answer description available for this question.

Question: Orsat apparatus is meant for
[A].

gravimetric analysis of flue gas.

[B].

finding out combustion efficiency.

[C].

direct determination of nitrogen in flue gas by absorbing it in ammoniacal cuprous chloride.

[D].

none of these.

Answer: Option D

Explanation:

No answer description available for this question.

Question: The advantage of firing pulverised coal in the furnace lies in the fact, that it
[A].

permits the use of high ash content coal.

[B].

permits the use of low fusion point ash coal.

[C].

accelerates the burning rate and economises on fuel combustion.

[D].

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

Answer: Option C

Explanation:

No answer description available for this question.

Question: In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of
[A].

transportation of coal.

[B].

drying of coal.

[C].

combustion of coal by supplying it around the burner.

[D].

preheating the primary air.

Answer: Option C

Explanation:

No answer description available for this question.