Fuels And Combustion MCQ Questions & Answers

91

Which will have the least volatile matter and hence will be the most difficult to ignite?

A) Bituminous coal B) Coke C) Semi-bituminous coal D) Aanthracite

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Answer & Solution

Answer: Option B

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92

Ratio of primary air to secondary air increases with increase in the rank of coal, because the

A) High rank coals have higher amount of volatile matter B) Ratio of fixed carbon to volatile matter increases C) Oxygen content progressively decreases D) Calorific value of the coal increases

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Answer & Solution

Answer: Option B

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93

White flue gas (resembling steam) coming out of the chimney of a thermal power plant indicates that the fuel used in the boiler furnace is

A) Tar B) Coke oven gas C) Pitch D) Pulverised coke

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Answer & Solution

Answer: Option B

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94

Calorific value of both the solid & liquid fuels can be determined by using __________ calorimeter.

A) Junker's B) Bomb C) Boy's D) None of these

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Answer & Solution

Answer: Option B

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95

Oxygen percentage (by weight) in atmospheric air is

A) 19 B) 21 C) 23 D) 29

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Answer & Solution

Answer: Option C

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96

Which of the following can be made into briquettes without the use of a binder?

A) Lignite B) Bituminous coal C) Anthracite coal D) None of these

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Answer & Solution

Answer: Option A

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97

Octane number of 2, 2, 4 - trimethyl pen-tane is

A) 0 B) 100 C) In between 0 and 100 D) More than 100

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Answer & Solution

Answer: Option B

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98

During coking of coal, the ash content (percentage)

A) Increases B) Decreases C) Remains constant D) None of these

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Answer & Solution

Answer: Option A

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99

Abel apparatus is used for those oils, whose flash points are___°F.

A) <120 B) >120 C) >280 D) 300-600

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Answer & Solution

Answer: Option A

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100

Pick out the wrong statement.

A) Theoretical flame temperature is the temperature attained by the products of combustion, when the fuel is burned without loss or gain of heat B) Burning the fuel with theoretically required amount of pure oxygen results in attainment of maximum adiabatic flame temperature C) Burning the fuel with excess pure oxygen results in maximum theoretical flame temperature D) Adiabatic flame temperatures of actual combustions are always less than the maximum values

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Answer & Solution

Answer: Option C

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Fuels And Combustion MCQ Questions & Answers | Chemical Engineering