Fuels And Combustion MCQ Questions & Answers

61

Fuel gases containing hydrocarbons (ie.g. coke oven gas) are not preheated before burning, mainly because

A) The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot B) It reduces its calorific value tremendously C) It reduces its flame temperature tremendously D) There are chances of explosion during preheating

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Answer & Solution

Answer: Option A

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62

Pick out the wrong statement.

A) LPG is also used as fuel for automobiles & small furnaces and for cutting & welding of metals B) The minimum temperature, at which a petroleum oil vapor catches fire and continues to burn, is called its flash point C) Each ton of petroleum oil on distillation produces about 30 - 50 Nm³ of gas D) Maximum yield of naphthalene is obtained on distillation of crude oil

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Answer & Solution

Answer: Option B

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63

Benzene is used

A) As a motor fuel B) As an explosive C) For making insecticides (e.g., DDT, BHC etc.), detergent & rubber (SBR) D) As a perfume

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Answer & Solution

Answer: Option C

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64

Wood charcoal is obtained by the destructive distillation of wood. It is used in the production of activated carbon, which is not used for the

A) Decolourisation of sugar B) Solvent recovery from air and gases C) Absorption of gases and vapor D) Electrode manufacture

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Answer & Solution

Answer: Option D

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65

Bright coal

A) Contains more than 90% durain B) Contains more than 90% fussain C) Contains mainly vitrain & clarain and is generally coking D) Is non-coking

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Answer & Solution

Answer: Option C

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66

'Fuel' can be defined as a substance which produces heat by

A) Combustion B) Nuclear fission C) Nuclear fusion D) All of the above

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Answer & Solution

Answer: Option D

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67

Tolerable concentration of toxic carbon monoxide in atmospheric air is about __________ PPm.

A) 50 B) 1000 C) 5000 D) 10000

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Answer & Solution

Answer: Option A

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68

Caking coal is desirable for

A) Burning on travelling grate B) Coke making C) Burning on firebars D) All of the above

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Answer & Solution

Answer: Option B

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69

When steam is passed over coal resulting in the endothermic reaction represent by, C + H₂O = CO + H₂, it is called the __________ of coal.

A) Carbonisation B) Oxidation C) Coalification D) Gasification

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Answer & Solution

Answer: Option D

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70

Calorific value of

A) Light paraffinic fuel oils is equal to that of equivalent olefins B) N-paraffin is lower than that of iso-paraffins of the same compounds C) Light paraffinic fuel oils is higher than that of equivalent olefins D) Light paraffinic fuel oils is lower than that of equivalent olefins

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Answer & Solution

Answer: Option C

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Fuels And Combustion MCQ Questions & Answers | Chemical Engineering