Factors that contribute to hydrogen cracking are:
A) Oil, grease, or paint B) Moisture absorbed in the electrode
C) Contaminated shielding gas D) All of the above
D
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In the USA, natural gas suppliers supply gas with a heat content of about 1,050 Btu/cu. ft.
Answer the following statement true (T) or false (F)
A Wet Standpipe system always has water under pressure in the piping so it should be protected from freezing. In some cases it may be necessary to increase the water pressure by means of a
A. diverter valve B. gravity booster C. auxiliary system D. fire pump
The accuracy of a thermometer is more important when working on high temperature refrigeration (air conditioning) systems.
Answer the following statement true (T) or false (F)
The number of protons in the nucleus of the atom is called the element's ____.
A. atomic number B. atomic weight C. atomic mass D. relative atomic mass