Fuels And Combustion MCQ Questions & Answers

81

Pick out the wrong statement.

A) Percentage of ash in coke produced from medium coking coal is more than that in coal B) The calorific value (kcal/Nm³) of coke oven gas reduces on removal of hydrogen from it by cryogenic method C) Ash is normally removed as D) Coal based fertiliser plants in India at Talcher (Orissa) and Ramagundam (A.P.) employ Kopper-Totzek process of coal gasification

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Answer & Solution

Answer: Option C

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82

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

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

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Answer & Solution

Answer: Option C

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83

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

A) 2000 B) 600 C) 1100 D) 1600

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Answer & Solution

Answer: Option C

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84

Actual flame temperature is always lower than the adiabatic flame temperature, because there is

A) No possibility of obtaining complete combustion at high temperature B) Always loss of heat from the flame C) Both A & B D) Neither A nor B

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Answer & Solution

Answer: Option C

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85

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

A) 1 B) < 1 C) > 1 D) Unpredicatable

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Answer & Solution

Answer: Option B

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86

Sometimes water is sprayed during coal charging in the coke oven, which helps in

A) Prevention of clinker formation in the oven B) Controlling the dust nuisance while charging the coal C) Reducing the cracking of hydrocarbons in the gas and increasing the percentage of CO & H₂ in the gas (due to the endothermic reaction represented by C + H₂O = CO + H₂) D) All of the above

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Answer & Solution

Answer: Option D

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87

The main drawback of supplying more excess air in the combustion of fuel is the

A) Excessive power requirement of air blower B) Enhanced sensible heat loss in the flue gas C) Intermittant and uncontrolled combustion of the fuel D) High exit flue gas temperature from the furnace

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Answer & Solution

Answer: Option B

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88

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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Answer & Solution

Answer: Option C

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89

Which of the following has the highest calorific value?

A) Lignite B) Sub-bituminous coal C) Anthracite D) Peat

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Answer & Solution

Answer: Option C

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90

Which of the following coke has the least percentage of ash?

A) Petroleum coke B) Beehive coke C) Foundary coke D) Metallurgical coke

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Answer & Solution

Answer: Option A

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Fuels And Combustion MCQ Questions & Answers | Chemical Engineering