Exhibit 2-2

question 53

Multiple Choice

Exhibit 2-2.The following is a list of five of the world's busiest airports by passenger traffic for 2010. Refer to Exhibit 2-2.The percentage of passenger traffic in the five busiest airports that occurred in Asia is closest to __________.

• A)18%
• B)21%
• C)25%
• D)38%

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Definitions:

Two Processors

A system configuration that involves two central processing units (CPUs) working together, often to increase performance or provide redundancy.

Actuator

A device used to convert a control signal into mechanical motion.

Discrete Output

Pertains to an output signal in automation systems that has only two states, commonly referred to as On or Off.

PLC

Programmable Logic Controller, an industrial digital computer which has been ruggedized and adapted for the control of manufacturing processes.