Fuels and Combustion

262.Naphthalene is used for making

1. Insecticides (e.g. moth balls)
2. Unsaturated polyesters
3. Drug intermediates e.g. β-naphthol
4. All (A), (B) and (C)

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263.Naphthalene recovered from coke oven gas is used

1. As moisture proof coating on fibres
2. As moth balls (insecticides)
3. As a fuel in furnaces
4. For making electrodes

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264.Narrow coke ovens as compared to wider coke ovens

1. Produce smaller coke
2. Produce stronger coke
3. Require less time of carbonisation
4. All (A), (B) and (C)

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265.Natural draft created by the chimney depends upon

1. Temperature of the flue gas
2. Its height
3. Both (A) & (B)
4. Neither (A) nor (B)

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266.Natural draught produced by a chimney depends upon the

1. Density of the chimney gases
2. Height of the chimney
3. Both (A) and (B)
4. Neither (A) nor (B)

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267.Net calorific value is the gross calorific value less the _________ heat of water in the product of combustion when cooled to 15°C.

1. Sensible
2. Latent
3. Sensible and latent
4. None of these

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268.Nitrogen in coal

1. Is present upto 1-2%
2. Comes from protein in parent vegetable matter
3. Is recovered as ammonia during its carbonisation
4. All (A), (B) and (C)

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269.Nitrogen present in the flue gas is determined in the Orsat apparatus by absorbing it in

1. KOH
2. Ammoniacal cuprous chloride
3. Pyrogallol solution
4. None of these

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270.Number of macrocomponents present in coal according to Stopes are:

1. Four
2. Five
3. Six
4. Two

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