31. Which country is the largest consumer of natural gas in the world?
a) United States
b) Russia
c) China
d) Japan
Answer: c) China
32. What is the process of converting natural gas into electricity and useful heat called?
a) Cogeneration
b) Combustion
c) Gasification
d) Vaporization
Answer: a) Cogeneration
33. Which gas is the primary component of compressed natural gas (CNG)?
a) Oxygen
b) Carbon dioxide
c) Methane
d) Nitrogen
Answer: c) Methane
34. What is the process of injecting chemicals into an oil reservoir to enhance oil recovery called?
a) Chemical flooding
b) Water flooding
c) Fracking
d) Acidizing
Answer: a) Chemical flooding
35. Which country is the largest producer of petroleum products in the world?
a) United States
b) Russia
c) Saudi Arabia
d) China
Answer: a) United States
