Fuels and Combustion

81.Caking index of the coal blend used for the manufacture of metallurgical coke should be around

1. 5
2. 21
3. 40
4. 48

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82.Calorific value as determined by bomb calorimeter is the

1. Higher calorific value at constant volume
2. Gross calorific value at constant pressure
3. Lower calorific value at constant pressure
4. Net calorific value at constant volume

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83.Calorific value of

1. Light paraffinic fuel oils is equal to that of equivalent olefins
2. n-paraffin is lower than that of iso-paraffins of the same compounds
3. Light paraffinic fuel oils is higher than that of equivalent olefins
4. Light paraffinic fuel oils is lower than that of equivalent olefins

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84.Calorific value of a typical dry anthracite coal may be around _________ Kcal/kg.

1. 1000
2. 4000
3. 8000
4. 15000

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85.Calorific value of bituminous coal may be around _________ Kcal/kg.

1. 500
2. 1500
3. 6500
4. 20000

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86.Calorific value of blast furnace gas is around _________ KCal/Nm³.

1. 850
2. 1800
3. 4200
4. 6500

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

1. Junker's
2. Bomb
3. Boy's
4. None of these

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88.Calorific value of coal middling generated in coal washeries during washing of coal may be around _________ Kcal/kg.

1. 1000
2. 4000
3. 6000
4. 8000

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89.Calorific value of coke even gas produced by low temperature carbonisation of coal is about _________ Kcal/Nm³.

1. 4000
2. 2500
3. 6500
4. 10000

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90.Calorific value of coke oven gas is around _________ Kcal/Nm³.

1. 900
2. 4200
3. 7500
4. 2000

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