Fuel Technologies Problems MCQs

1. Which fuel has the highest hydrogen-to-carbon ratio?

(A) Diesel

(B) Gasoline

(C) Natural gas

(D) Coal

2. Knocking in petrol engines is mainly caused by:

(A) Slow combustion

(B) Premature ignition

(C) Low flame temperature

(D) Excess air supply

3. Which parameter indicates diesel ignition quality?

(A) Octane number

(B) Cetane number

(C) Flash point

(D) Cloud point

4. The major impurity in coal that causes SO₂ emissions is:

(A) Sulfur

(B) Nitrogen

(C) Carbon dioxide

(D) Moisture

5. The main cause of incomplete combustion is:

(A) Low air supply

(B) High fuel temperature

(C) Excess pressure

(D) High viscosity

6. Fuel with high ash content generally:

(A) Burns faster

(B) Has higher calorific value

(C) Has lower efficiency

(D) Has no effect on boilers

7. Which fuel has the lowest calorific value per kg?

(A) Coal

(B) Hydrogen

(C) Wood

(D) Diesel

8. High moisture in coal causes:

(A) Higher flame temperature

(B) Faster burning

(C) Reduced calorific value

(D) Higher efficiency

9. Which gas is the major component of CNG?

(A) Ethane

(B) Butane

(C) Propane

(D) Methane

10. High viscosity in fuel oil leads to:

(A) Better atomization

(B) Poor atomization

(C) Lower pump pressure

(D) Higher flame temperature

11. A high octane number fuel resists:

(A) Preheat

(B) Flash point

(C) Detonation

(D) Exhaust loss

12. The flash point indicates:

(A) Burning temperature

(B) Fuel density

(C) Flame speed

(D) Vapour ignition level

13. Greater carbon content in coal results in:

(A) Lower calorific value

(B) Less heat output

(C) More ash

(D) Higher calorific value

14. The main pollutant from incomplete combustion is:

(A) CO₂

(B) NOₓ

(C) SO₂

(D) CO

15. The best fuel for high-compression engines is:

(A) Low octane gasoline

(B) Diesel

(C) High octane gasoline

(D) Furnace oil

16. The major cause of SOx emissions from fuel oil is:

(A) Carbon

(B) Sulfur

(C) Moisture

(D) Nitrogen

17. The calorific value of a fuel is measured in:

(A) Watts

(B) Pascal

(C) kg/m³

(D) Joules

18. Which fuel is used in fuel cells?

(A) Hydrogen

(B) Diesel

(C) Furnace oil

(D) Coal

19. The main problem with very low flash point fuels is:

(A) Slow burning

(B) High viscosity

(C) Poor ignition

(D) High explosion risk

20. Water contamination in fuel oil results in:

(A) Higher fire point

(B) Flame instability

(C) Increased calorific value

(D) Lower sulfur level

21. Heavy fuel oil requires preheating to reduce:

(A) Calorific value

(B) Viscosity

(C) Sulfur content

(D) Octane number

22. The presence of ash in coal reduces:

(A) Flame speed

(B) Sulfur emissions

(C) Heating efficiency

(D) Moisture content

23. Which fuel is prone to knocking in SI engines?

(A) High octane fuel

(B) Low octane fuel

(C) Diesel

(D) LNG

24. LPG mainly contains:

(A) Methane

(B) Hydrogen

(C) CO₂

(D) Propane & butane

25. A higher cetane number indicates:

(A) Poor ignition quality

(B) Good ignition quality

(C) High volatility

(D) Low flash point

26. Diesel engines typically suffer from:

(A) Knocking

(B) Spark plug failure

(C) Ignition delay

(D) Fuel vaporization issues

27. Fuel atomization improves with:

(A) Higher viscosity

(B) Higher ash

(C) Lower viscosity

(D) More moisture

28. High sulfur fuels cause:

(A) Higher calorific value

(B) Improved efficiency

(C) Boiler corrosion

(D) Faster ignition

29. CNG storage cylinders are filled at:

(A) Low pressure

(B) High pressure

(C) Vacuum conditions

(D) Atmospheric pressure

30. Coal with the highest carbon content is:

(A) Lignite

(B) Bituminous

(C) Peat

(D) Anthracite

31. Fuel oil deposits in burners are due to:

(A) High flash point

(B) High viscosity

(C) Overheating

(D) Excess oxygen

32. Petrol engine knocking is reduced by:

(A) Increasing compression

(B) Using diesel

(C) Using high octane fuel

(D) Reducing ignition delay

33. The main cause of smoke in diesel engines is:

(A) Low sulfur

(B) Incomplete combustion

(C) High octane number

(D) Excess air

34. Hydrogen as a fuel has:

(A) Low flame speed

(B) Low calorific value

(C) High flame speed

(D) High viscosity

35. Coal gasification converts coal into:

(A) Liquid fuel

(B) Producer gas

(C) Diesel

(D) Coke

36. Biofuels are primarily produced from:

(A) Metals

(B) Plastics

(C) Agricultural biomass

(D) Minerals

37. The major pollutant from diesel engines is:

(A) Ozone

(B) SOx

(C) Helium

(D) Particulate matter

38. A high pour point indicates a fuel will:

(A) Flow easily at low temperature

(B) Solidify at high temperature

(C) Not flow at low temperature

(D) Vaporize quickly

39. LNG is stored at:

(A) High temperature

(B) Very low temperature

(C) Room temperature

(D) High pressure

40. The purpose of fuel additives is:

(A) Increase fuel density

(B) Increase ash content

(C) Improve performance

(D) Lower vaporization

41. Which fuel is most prone to auto-ignition?

(A) Hydrogen

(B) Gasoline

(C) LPG

(D) Diesel

42. Low cetane number leads to:

(A) Longer ignition delay

(B) Quick ignition

(C) Lower emissions

(D) Stable combustion

43. Which pollutant forms acid rain?

(A) CO

(B) SO₂

(C) Argon

(D) Helium

44. Fuel with higher volatility vaporizes:

(A) Not at all

(B) Slower

(C) Only at high pressure

(D) Faster

45. Calorific value decreases with increase in:

(A) Carbon

(B) Hydrogen

(C) Moisture

(D) Paraffin content

46. Which is a renewable fuel?

(A) Diesel

(B) Ethanol

(C) Furnace oil

(D) Coal

47. The main component of biogas is:

(A) Methane

(B) Oxygen

(C) CO₂

(D) Ethane

48. Catalyst poisoning in fuel reformers is due to:

(A) Sulfur compounds

(B) Helium

(C) Hydrogen

(D) Water

49. The fire point of a fuel is:

(A) Minimum ignition temperature

(B) Temperature at which sustained combustion occurs

(C) Temperature of flame quenching

(D) Max vapor pressure point

50. High ash coal results in:

(A) Boiler slagging

(B) Higher efficiency

(C) Cleaner combustion

(D) Less emissions