With reference to 'fuel cells' in which hydrogen-rich fuel and oxygen are used to generate electricity, consider the following statements:
1. If pure hydrogen is used as a fuel, the fuel cell emits heat and water as by-products.
2. Fuel cells can be used for powering buildings and not for small devices like laptop computers.
3. Fuel cells produce electricity in the form of Alternating Current (AC).
Which of the statements given above is/are correct?
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A.
1 only
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B.
2 and 3 only
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C.
1 and 3 only
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D.
1, 2 and 3
Correct Answer:
A. 1 only
Explanation:
With reference to bio-toilets used by the Indian Railways:
The decomposition of human waste in bio-toilets is initiated by bacteria, not fungal inoculum.
The decomposition produces mainly methane, carbon dioxide, and water vapor, not just ammonia and water vapor.
So, both statements 1 and 2 are incorrect, meaning the correct answer is (d) Neither 1 nor 2.
Explanation about fuel cells based on the search:
If pure hydrogen is used as fuel, the fuel cell emits heat and water as by-products. This is correct.
Fuel cells can be used for powering small devices like laptop computers as well as larger applications, so statement 2 is incorrect.
Fuel cells produce electricity in the form of Direct Current (DC), not Alternating Current (AC), so statement 3 is incorrect.
Therefore, only statement 1 is correct, and the correct answer is (a) 1 only.
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