Fuels and Combustion

111.Coke compared to the coal from which it has been made, contains

1. Less volatile matter
2. More carbon
3. Greater percentage of ash
4. All (A), (B) and (C)

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112.Coke having higher porosity has

1. Lower bulk density
2. Lower strength
3. Higher reactivity
4. All (A), (B) and (C)

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113.Coke made in narrower by-product coke ovens (as compared to wider ovens) is

1. Less reactive
2. Stronger
3. Smaller in size
4. All (A), (B) & (C)

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114.Coke oven gas after passing through return electrostatic tar precipitator (RETP) is used for the

1. Hot scarfing of steel slabs
2. Mixing with blast furnace gas
3. Coke oven battery heating
4. Steel ladle drying

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115.Coke oven gas burns with a yellowish flame, because of the presence of

1. CO₂
2. CH₄
3. H₂
4. NH3

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116.Coke oven gas compared to blast furnace gas is

1. More explosive and inflammable
2. Less poisonous
3. Lighter
4. All (A), (B) and (C)

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117.Coke oven gas constitutes mainly of

1. H₂ & CO
2. H₂ & CH₄
3. CH₄ & CO
4. H₂ & CO₂

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118.Coke oven gas is a better fuel than blast furnace gas, because of its higher

1. Calorific value, cleanliness and relatively low distribution cost (due to its low specific gravity)
2. Adiabatic flame temperature
3. Heat release rate (thus requiring smaller combustion chamber)
4. All (A), (B) and (C)

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119.Coke oven gas is stripped of its H₂S and mercaptans content by

1. Absorption in wash oil
2. Adsorption on bog iron bed
3. Bubbling it through dilute sulphuric acid
4. Adsorption on silica gel

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120.Coke oven gas produced by high temperature carbonisation of coal (as compared to that produced by low temperature carbonisation), has

1. Higher calorific value
2. Lower hydrogen content
3. Both (A) and (B)
4. Neither (A) nor (B)

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