The Coefficient of Linear Expansion of Steel Is 12 ×

question 24

Multiple Choice

The coefficient of linear expansion of steel is 12 × 10^-6 K^-1.What is the change in length of a 25-m steel bridge span when it undergoes a temperature change of 40 K from winter to summer?

• A)1.2 cm
• B)1.4 cm
• C)1.6 cm
• D)1.8 cm
• E)2.0 cm

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Definitions:

Terminals

The end points of an electrical device or a cable where connections are made to enable the flow of electrical current.

Diode

A semiconductor device that allows current to flow in one direction only, used in electronics for rectification and signaling.

Relay

Any of a number of devices that receives a signal and then effects an action. In vehicle electrical circuits, relays are used to allow a small current circuit to control a large current circuit such as in a starter relay. Also known as a pilot.

Transistor

A semiconductor device used to amplify or switch electronic signals and electrical power, fundamental in modern electronic circuits.