Natural gas is mainly composed of propane, which typically makes up about 70-90% of its volume



Indicate whether the statement is true or false.


F

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A part made from 1040 hot-rolled steel is to be heat treated to increase its strength to approximately 100 kpsi. What Brinell hardness number should be expected from the heat-treated part?

What will be an ideal response?

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Dual-check valve backflow preventer assemblies are difficult for plumbers to remove, test, or replace because they _____.

a. have left-hand threaded connections b. do not have replaceable valve inserts c. are installed in very tight spaces d. are not normally fitted with shutoff valves or test cocks

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In a recirculating water system condenser, the leaving water temperature is normally ____________________°F lower than the condensing temperature of the refrigerant.

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

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Which type of electrical space heater has the greatest potential for overheating?

A) Convection baseboard electric space heaters B) Forced-air electric space heaters C) Cabinet-type electric space heaters D) Suspended-force fan-unit electric space heaters

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