When a geothermal heat pump system uses anti-freeze in the loop, how is antifreeze added to the loop?
A) pumping the antifreeze in under pressure
B) pouring the antifreeze in the loop after it is connected
C) temporarily connecting a purge unit
D) pouring the antifreeze in the loop before it is connected
C
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What is considered a good vacuum level for a deep vacuum?
A) 500 microns B) 100 microns C) 28" hg vacuum D) 1000 microns
A surface profile outlines the form or shape of a complete surface in ____________________ dimensions.
Fill in the blank(s) with the appropriate word(s).
The abbreviation for part is ____________________.
Fill in the blank(s) with the appropriate word(s).
What is the difference between a push belt and a pull chain?
A) A pull-chain is made up of links and link pins B) A push-belt is made up of about 400 wedge -shaped segments C) A pull chain looks similar to a silent chain D) All of the above