Final answer:
The incorrect statement is that fuel cells have high noise levels because they are known for operating quietly, which is contrary to the claim in the question. Option D is correct.
Step-by-step explanation:
The incorrect statement among the options provided is that 'The noise levels of fuel cells are high'. Fuel cells are known for their high efficiency, generally between 40% and 60%, which is higher than traditional internal combustion engines.
They are inherently low-emission as their by-products are often just water and heat, particularly in the case of hydrogen fuel cells. In terms of their design, fuel cells can be modular, allowing for scalability depending on the power requirements. However, one of the characteristics of fuel cells is that they operate quietly, making the statement about high noise levels incorrect.
The incorrect statement is option d) The noise levels of fuel cells are high.
Fuel cells are known for their high efficiency, producing electrical energy at a higher rate compared to internal combustion engines. They also have low emission levels, far below the permissible limits, making them environmentally friendly.
Fuel cells are modular, allowing for easy scalability and integration into different systems. However, fuel cells are not loud and do not produce high noise levels. In fact, they are relatively quiet compared to traditional engine-based power sources.