OPSC OAS 2022 PrelimsScience & TechnologyQuestion 2
Solved previous year question from the OPSC OAS/OCS 2022 Preliminary Examination (General Studies), with the official answer key and a detailed explanation.
Question
Jet fuel used in turbine based aviation engine mainly consists of
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Answer & Explanation
Correct answer: (C) Kerosene
Jet fuel used in turbine-based aviation engines (jet engines and turboprop engines) is primarily composed of kerosene — a refined petroleum product derived from crude oil through fractional distillation.
Types of jet fuel
- Jet A and Jet A-1 – Most widely used commercial jet fuels, kerosene-based
- JP-8 – Military jet fuel, also kerosene-based
- Jet B – A blend of gasoline and kerosene (less common, used in very cold climates)
- Aviation Turbine Fuel (ATF)-Kerosene based,Used in India for commercial aviation.
Why kerosene is used
- High energy density – Provides more energy per unit volume
- Appropriate flash point – Safe for storage and handling (above 38°C)
- Freezing point – Remains liquid at high altitudes where temperatures are very low
- Clean burning – Produces fewer deposits in engines
- Stability – Does not degrade easily during storage
