Critical Reasoning (CR) | Re: A new silencing device for domestic appliances operates by producing

A new silencing device for domestic appliances operates by producing sound waves that cancel out the sound waves produced by the appliance. The device, unlike conventional silencers, actively eliminates the noise the appliance makes, and for that reason vacuum cleaners designed to incorporate the new device will operate with much lower electricity consumption than conventional vacuum cleaners.

Which one of the following, if true, most helps to explain why the new silencing device will make lower electricity consumption possible?

(A) Designers of vacuum cleaner motors typically have to compromise the motors’efficiency in order to reduce noise production. - CORRECT. At first looks irrelevant but for it to makes sense one has to assume that less efficient motors consume less electricity. Along with that new silencing device are used thus consuming less electricity.

(B) The device runs on electricity drawn from the appliance’s main power supply. - WRONG. This is the most confusing
...

Statistics : Posted by unraveled • on 26 Mar 2020, 01:09 • Replies 5 • Views 5645

---