What type of refrigerants are normally used in CO2 cascade refrigeration systems?
A) CO2 refrigerant in the high temperature system and HFC refrigerant in the low temperature system
B) HFC refrigerant in the high temperature system and CO2 in the low temperature system
C) CO2 refrigerant in both the high and low temperature systems
D) HFC refrigerant mixed with CO2 in both systems
B
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What is the advantage of an oxyacetylene torch compared to an air acetylene torch?
A) It is a more intense flame that heats up the parts faster than air acetylene flames. B) Oxyacetylene flames cannot form carbon. C) Oxyacetylene equipment is simpler. D) Oxyacetylene torches do not oxidize metal when heating it like acetylene torches.
The _____________________ is the section of the furnace that encloses the gas flame.
Fill in the blank(s) with the appropriate word(s).
Task area fluorescent fixtures are generally two-, three-, or four-lamp fixtures made in lengths of _____.
a. 1' and 4' b. 3' and 6' c. 4' and 8' d. 5' and 9
Convert 100° Rankine to Fahrenheit
A) 100 - 460 = -360°F B) 100 + 460 = 560°F C) 100 - 273 = -173°F D) 100 + 273 = 373°F