Final answer:
Fabric filters can achieve efficiencies of over 99%, capturing more than 99% of particulate matter. The formula to calculate percentage efficiency is 'Efficiency = Eff × 100%'. Improving efficiency results in energy savings as less energy is wasted.
Step-by-step explanation:
The efficiency that can be attained by fabric filters in a plant is often very high. Typically, fabric filters can achieve efficiencies of over 99% when they are properly maintained and operated under suitable conditions. This means that they are capable of capturing more than 99% of particulate matter from the airstream, making them highly efficient for air pollution control. The option c. +99% efficient is the correct answer.
To calculate percentage efficiency in general terms, you can use the formula: percentage efficiency = Eff × 100%. So if a process has an efficiency (Eff) of 42.0%, the percentage efficiency would be 42.0 × 100%, which equals 42.0%. Changes in efficiency also impact the amount of energy saved or lost; for instance, improving a heat engine's efficiency from 70.7% to 75.0% would result in energy savings because less heat is wasted.