Fuels and Combustion

101.Catalyst used in Fischer-Tropsch process is

1. Nickel
2. Zinc oxide
3. Alumina
4. Thorium oxide

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102.Coal containing large quantity of _________ are difficult to wash.

1. Ash
2. Inherent mineral matter
3. Free impurities
4. Volatile matter

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103.Coal is heated in absence of air for 7 minutes at a temperature of about _________ °C, during its volatile matter determination for proximate analysis.

1. 550
2. 750
3. 950
4. 1150

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104.Coal is heated in presence of air to a temperature of about _________ °C, while determining its ash content for proximate analysis.

1. 500
2. 750
3. 950
4. 1100

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105.Coal is pulverised before burning in large capacity boiler furnaces mainly to

1. Ensure its complete combustion
2. Facilitate easy ash removal
3. Enhance its calorific value
4. Provide trouble free operation

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106.Coal tar (produced by high temperature carbonisation) is the main source of

1. Aromatic compounds
2. Aliphatic compounds
3. Paraffins
4. Olefins

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107.Coal tar fuel - 200 (CTF 200) is a mixture of

1. Pitch and creosote oil
2. Light oil and pitch
3. Anthracene and crecosote oil
4. Solar oil and pitch

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108.Coal tar fuels (CTF) as compared to petroleum based fuel oils have higher

1. Calorific value
2. Higher C/H ratio
3. Sulphur content
4. Difference in gross & net calorific value

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109.Coalification means the

1. Process of conversion of lignite into anthracite
2. Underground gasification of coal
3. Complete combustion of coal
4. Direct hydrogenation of coal

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110.Coals used for the generation of producer gas should have

1. High caking index
2. Low fusion point of ash
3. High volatile matter content
4. Very low ash content (8-10%)

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