Question

drew is showing his friends a device that he claims is able to trap 90 percent of the pollutants in automobile exhaust. to build the device, drew

• outfitted a vacuum cleaner with a specially - designed air filter.
• modified the vacuum cleaner to allow it to receive electricity from a gasoline - powered engine, and
• attached a rubber fitting and adjustable clamp to the end of the vacuum hose.

which of drews modifications to the vacuum cleaner could potentially reduce the effectiveness of his device?

a. allowing it to receive electricity from gasoline - powered engines
b. outfitting it with a specially designed air filter
c. attaching a rubber fitting and adjustable clamp to the hose
d. all of these

Explanation:

A gasoline - powered engine may introduce contaminants, vibrations, and inconsistent power supply which could disrupt the vacuum cleaner's normal operation and reduce its effectiveness in trapping pollutants. A specially designed air filter (B) is likely to enhance effectiveness, and attaching a rubber fitting and adjustable clamp (C) is a structural modification that doesn't inherently reduce effectiveness.

Answer:

A. allowing it to receive electricity from gasoline - powered engines