Junker's calorimeter is used to determine the calorific value of (A) Pulverised coal (B) Gaseous fuels (C) Fuel oil (D) None of these

Junker's calorimeter is used to determine the calorific value of
(A) Pulverised coal
(B) Gaseous fuels
(C) Fuel oil
(D) None of these
by

1 Answer

Answer :

(B) Gaseous fuels
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Use of pulverised coal in boilers provides (A) Higher calorific value (B) Better combustion (C) Smokeless burning (D) Less erosion on furnace wall

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In practical operation of any furnace, zero oxygen percentage or theoretical CO2 percentage in flue gas is rarely achieved, because of (A) Use of non-preheated combustion air (B) Use of pulverised solid fuels (C) Imperfect mixing of fuel & air and infiltration of air (D) Use of excessive positive draft in the furnace

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Last Answer : (A) Type (solid, liquid or gaseous)

Among the fuels given below, the one with highest calorific value is – (1) Coke (2) Coal (3) Wood (4) Natural gas

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Last Answer : Natural gas

Which of the following statement is incorrect?  A. The liquid fuels consist of hydrocarbons.  B. The liquid fuels have higher calorific value than solid fuels.  C. The solid fuels have higher calorific value than liquid fuels.  D. A good fuel should have low ignition point.

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Last Answer : Answer: C

Calorific value as determined by bomb calorimeter is the (A) Higher calorific value at constant volume(B) Gross calorific value at constant pressure(C) Lower calorific value at constant pressure(D) Net calorific value at constant volume

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Last Answer : (A) Higher calorific value at constant volume

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The advantages 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 consumption (D) All (A), (B) and (C)

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Last Answer : (C) Accelerates the burning rate and economises on fuel consumption

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Last Answer : (C) Accelerates the burning rate and economises on fuel combustion

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Last Answer : (A) Low amount of excess combustion air

Which of the following fuel gases has the highest calorific value? (A) Natural gas (B) Coal bed methane (CBM) (C) Liquefied petroleum gas (LPG) (D) Sewage gas

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Last Answer : (C) Liquefied petroleum gas (LPG)

Fuels that may classified conveniently in solid, liquid and gaseous.  a. Unleaded fuel  b. Diesel fuel  c. Fossil fuel  d. All of the above

Description : Fuels that may classified conveniently in solid, liquid and gaseous.  a. Unleaded fuel  b. Diesel fuel  c. Fossil fuel  d. All of the above

Last Answer : Fossil fuel

The function of an economiser in a boiler is to preheat the (A) Feedwater (B) Combustion air (C) Pulverised coal (D) Furnace oil

Description : The function of an economiser in a boiler is to preheat the (A) Feedwater (B) Combustion air (C) Pulverised coal (D) Furnace oil

Last Answer : (A) Feedwater

Which of the following would require maximum amount of % excess air for complete combustion? (A) Coke oven gas (B) Furnace oil (C) Pulverised coal (D) Lump coal (fixed on chain grate)

Description : Which of the following would require maximum amount of % excess air for complete combustion? (A) Coke oven gas (B) Furnace oil (C) Pulverised coal (D) Lump coal (fixed on chain grate)

Last Answer : (D) Lump coal (fixed on chain grate)

Pitch (a product of coal tar distillation) is always mixed with creosote oil, when it is to be burnt in a burner, because (A) Its calorific value is very less (B) Tar neutralises the residual acids present in pitch (C) It reduces viscosity and imparts fluidity for its transportation through pipelines at economic pressure drop (D) All (A), (B) and (C)

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Last Answer : (C) It reduces viscosity and imparts fluidity for its transportation through pipelines at economic pressure drop

Fossil fuels mean (A) Solid fuels (B) Liquid fuels (C) Those fuels which are found in the crust of earth (D) Premature fuels with low calorific value

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Last Answer : (C) Those fuels which are found in the crust of earth

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

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Out of the following fuels, the difference between gross and net calorific value will be minimum in case of (A) Coke oven gas (B) Water gas (C) Natural gas (D) Blast furnace gas

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