Using Data from the 2010 Census,the Current Population of the United

question 43

Multiple Choice

Using data from the 2010 Census,the current population of the United States is estimated to be about.

• A)171 million
• B)311 million
• C)439 million
• D)695 million

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Definitions:

FMVSS 121

Legislation that defines minimum standards for all highway operated air brake equipment.

System Pressure

Usually refers to the range of pneumatic circuit pressures between cut-out and cut-in pressure values in an FMVSS 121–compliant air brake system. Can refer to other fluid power circuit pressures such as those in transmission hydraulics and engine lube circuits.

Tractor/Trailer Combination

A configuration consisting of a tractor unit that provides the motive power and a trailer unit that carries the cargo, commonly used for freight transport.