In the context of proposals to the use of hydrogen-enriched CNG (H-CNG) as fuel for buses in public transport, consider the following statements:
1. The main advantage of the use of H-CNG is the elimination of carbon monoxide emissions.
2. H-CNG as fuel reduces carbon dioxide and hydrocarbon emissions.
3. Hydrogen up to one-fifth by volume can be blended with CNG as fuel for buses.
4. H-CNG makes the fuel less expensive than CNG.

Which of the statements given above is/are correct?

1 only

2 and 3 only

4 only

1, 2, 3 and 4

APEDIA

UPSC Prelims

2019 • 02 Jun, 2019 • Paper-1

In the context of proposals to the use of hydrogen-enriched CNG (H-CNG) as fuel for buses in public transport, consider the following statements:
1. The main advantage of the use of H-CNG is the elimination of carbon monoxide emissions.
2. H-CNG as fuel reduces carbon dioxide and hydrocarbon emissions.
3. Hydrogen up to one-fifth by volume can be blended with CNG as fuel for buses.
4. H-CNG makes the fuel less expensive than CNG.

Which of the statements given above is/are correct?

Correct Answer

2 and 3 only

Statement 1 Analysis: This is incorrect because of the extreme word 'elimination'. While H-CNG significantly reduces carbon monoxide emissions (up to 70%), it d......

💡 Analysis & Explanation

Statement 1 Analysis ▼

This is incorrect because of the extreme word 'elimination'. While H-CNG significantly reduces carbon monoxide emissions (up to 70%), it does not completely eliminate them.

Statement 2 Analysis ▼

This is correct. The addition of hydrogen promotes more complete combustion, leading to a marked reduction in carbon dioxide and unburned hydrocarbon emissions compared to regular CNG.

Statement 3 Analysis ▼

This is correct. Global and Indian testing standards generally recognize that hydrogen can be safely blended up to 18-20% (roughly one-fifth) by volume with CNG for optimal engine performance without requiring major modifications.

Statement 4 Analysis ▼

This is incorrect. The complex process of extracting and blending hydrogen actually makes H-CNG more expensive to produce than conventional CNG.

Conclusion ▼

Statements 2 and 3 are factually accurate, making option B the correct choice.

Choose Language

See you soon!