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Organic Chemistry F. The Fuel

📆 October 23, 2024

Total Questions: 56

11. Consider the following statements and choose the right options given below: [Chhattisgarh P.C.S. (Pre) 2023]

  1. Fuel obtained from plastic waste has low octane rating.
  2. Lower the octane number, more is the ability of the fuel to withstand compression without detonating.
Correct Answer: (c) Both the statements (1) and (2) are incorrect
Solution:Fuel obtained from plastic waste has high octane rating. It contains no lead and is known as 'green fuel'. An octane rating, or octane number, is a standard measure of a fuel's ability to withstand compression in an internal combustion engine without undergoing pre-ignition. The higher the octane number, the more compression the fuel can withstand before detonating. Hence, both statements are incorrect.

12. Octane number is a measure of the quality of – [U.P. Lower Sub. (Pre) 2009]

Correct Answer: (b) Petrol
Solution:The octane number of a fuel (petrol) is the measure of its antiknock quality when it is used in a spark ignition, internal combustion engine as compared to the antiknock quality of ISO-octane. The higher octane number of a fuel means the better anti-knocking capacity for that fuel.

13. The quality of petrol is expressed by: [66th B.P.S.C. (Pre) (Re. Exam) 2020]

Correct Answer: (b) Octane number
Solution:The octane number of a fuel (petrol) is the measure of its antiknock quality when it is used in a spark ignition, internal combustion engine as compared to the antiknock quality of ISO-octane. The higher octane number of a fuel means the better anti-knocking capacity for that fuel.

14. Cetane number is used as a quality parameter mainly for which of the following? [U.P. Lower Sub. (Pre) 2015]

Correct Answer: (c) Diesel
Solution:As the octane number is used to measure the ignition stability of gasoline (petrol), the cetane number is used as a quality parameter for diesel. The combustion of diesel without spark is provided by compression. Thus, as soon as the diesel fuel is ignited and compressed, the cetane number will be higher. This identifies the good quality of diesel. A higher cetane number means the fuel will ignite more readily and result in smoother engine operation.

15. The fuel used in a diesel engine is: [U.P.P.C.S. (Pre) 1994]

Correct Answer: (a) Vapour of diesel and air
Solution:A diesel engine is an internal combustion engine in which ignition in fuel is generated by using heat produced by compressing air in a closed place. There is no carburetor in diesel engines for combustion as in petrol engines. In a diesel engine, the air inside a cylinder is compressed to such a level that the temperature of air reaches 80°F, and this temperature works as combustion in diesel engines.

16. Cooking gas is mainly – [44th B.P.S.C. (Pre) 2000]

Correct Answer: (c) Methane
Solution:Methane is the chief component of biogas or gobar gas which is used for domestic purposes.

17. Which one of the following gases, released from biogas plant, is used as a fuel gas? [U.P. P.C.S. (Pre) 2016]

Correct Answer: (c) Methane
Solution:Methane is the principal gas in biogas. It is also the main component of natural gas, a fossil fuel, and can be used to replace natural gas in many applications including cooking, heating, steam production, etc.

18. Biogas mainly consists of – [U.P. U.D.A./L.D.A. (Pre) 2010]

Correct Answer: (c) Carbon dioxide and Methane
Solution:Biogas typically refers to a mixture of different gases produced by the breakdown of organic matter in the absence of oxygen. Biogas is primarily methane and carbon dioxide and may have small amounts of hydrogen sulfide, moisture, and siloxanes. Biogas or gobar gas generally contains about 50%-75% Methane and about 25%-45% carbon dioxide.

19. Which among the following is the main constituent of biogas? [67th B.P.S.C. (Pre) (Re. Exam) 2022]

Correct Answer: (a) Methane
Solution:Biogas typically refers to a mixture of different gases produced by the breakdown of organic matter in the absence of oxygen. Biogas is primarily methane and carbon dioxide and may have small amounts of hydrogen sulfide, moisture, and siloxanes. Biogas or gobar gas generally contains about 50%-75% Methane and about 25%-45% carbon dioxide.

20. The main component of biogas is: [Uttarakhand P.C.S. (Pre) 2012]

Correct Answer: (b) Methane
Solution:Biogas typically refers to a mixture of different gases produced by the breakdown of organic matter in the absence of oxygen. Biogas is primarily methane and carbon dioxide and may have small amounts of hydrogen sulfide, moisture, and siloxanes. Biogas or gobar gas generally contains about 50%-75% Methane and about 25%-45% carbon dioxide.
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