The Three Curves Show the Harmonics of a Pipe That

question 23

Multiple Choice

The three curves show the harmonics of a pipe that is closed one end and open the other end. The fundamental frequency is f_o. The three harmonics are

• A) f_o, 2f_o, 3f_o
• B) f_o, 5f_o, 7f_o
• C) f_o, 4f_o, 6f_o
• D) f_o, 3f_o, 4f_o
• E) f_o, 6f_o, 8f_o

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Definitions:

UPS

Uninterruptible Power Supply, a device that provides emergency power to a load when the input power source or mains power fails.

Surge Protector

A device that protects electrical appliances from voltage spikes by blocking or shorting to ground any unwanted voltages above a safe threshold.

Line Conditioner

A device that improves the quality of electrical power by stabilizing voltage and filtering noise and spikes.

Gpupdate

A command used to refresh local and Active Directory-based Group Policy settings.