How is a temperature-pressure relief valve on a hot-water boiler tested?

A) Pressurize the boiler with nitrogen until the pressure relief valve opens.
B) Pressure relief valves are optional, so testing is not required.
C) Jump the high limit and operate the burners until the pressure relief valve opens.
D) Pull lever and look for water at outlet of discharge pipe.


D

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Electrical devices or components are shown in their ____________________ condition on a ladder diagram.

Fill in the blank(s) with the appropriate word(s).

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One advantage blast freezing offers over some other forms of freezing is _____.

a. the ability to freeze foods of irregular size and shape b. that dehydration is minimized c. that it is the most rapid freezing method d. that foods become lighter in weight and need no future refrigeration

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Soil should always be covered with an inorganic mulch, which provides food for the good microorganisms

Indicate whether the statement is true or false

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Which of the following objects can represent any type of faceted surface?

a. Region b. 3D face c. Polygon mesh d. 2D solid

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