One of the Earliest Recorded Air Pollution Events in a City

question 30

Multiple Choice

One of the earliest recorded air pollution events in a city that was associated with human deaths was

• A) heavy smog in Los Angeles prior to the Clean Air Act.
• B) disruption of the Beijing Olympic Games in 2008.
• C) smoke and fog over London due to burning of coal in the late 1800s.
• D) a pesticide release in India in the 1980s.
• E) the 2012 forest fires outside Colorado Springs.

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Definitions:

Binary Input

A digital input signal that has two possible states, 0 or 1, representing off or on conditions in electronic devices.

Analog Output

An electrical signal that represents a continuous physical quantity, used in control systems to drive or modulate external devices.

Electrical Isolation

A technique of preventing direct electrical current flow between two parts of an electrical system, often achieved through the use of optoisolators or transformers, to protect against surges and interference.

Points per Module

The number of inputs or outputs that a single module in a modular system, such as a PLC, can handle or support.