UPSC Prelims 2015 – Question 95

95.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?
   a) 1 only
   b) 2 and 3 only
   c) 1 and 3 only
   d) 1, 2 and 3

The correct answer is 1 only. 

• Fuel Cells 
  • If pure hydrogen is employed as a fuel, fuel cells release only heat and water as by-products. Hence statement 1 is correct. 
  • Fuel cells might power our cars, with hydrogen replacing petroleum fuels. 
  • It can power almost any portable device or machine that uses batteries. Laptop computers, cellular phones, and hearing aids could be powered by portable fuel cells. Hence statement 2 is incorrect. 
  • Hydrogen-powered fuel cells are more energy-efficient than traditional combustion technologies. 
  • It produces electricity in the form of direct current (DC). Hence statement 3 is incorrect. 

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