Here is Question No. 43 a part of our series on UPSC Prelims 2019
Q43. 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:
- The main advantage of the use of HCNG is the elimination of carbon monoxide emissions.
- H-CNG as fuel reduces carbon dioxide and hydrocarbon emissions.
- Hydrogen up to one -fifth by volume can be blended with CNG as fuel for buses.
- H-CNG makes the fuel less expensive than CNG.
Which of the statements given above is/are correct?
(a) 1 only
(b) 2 and 3 only
(c) 4 only
(d) 1, 2, 3 and 4
Answer: B
- Statement 1 is not correct: Compared to conventional CNG, use of H-CNG can reduce the emission of carbon monoxide up to 70%, not complete emission.
- Statement 2 is correct: H-CNG as fuel also reduces carbon dioxide and hydrocarbon emissions.
- Statement 3 is correct: Hydrogen-enriched CNG (H-CNG) is a blend of hydrogen and CNG, the ideal hydrogen concentration being 18%. The US, Brazil, Canada, and South Korea have all conducted trials and found that they get a reduction in emissions from buses using H-CNG.
- Statement 4 is not correct: Physical blending of CNG and hydrogen involves a series of energy-intensive steps that would make HCNG more expensive than CNG.
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