What is the difference between a mercury barometer and an aneroid barometer?
What will be an ideal response?
The mercury barometer compares atmospheric pressure against the weight of a mercury column. The aneroid barometer compares atmospheric pressure against pressure inside closed bellows.
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A(n) ____ is an electric safety switch that automatically opens a circuit when excessive amperage occurs.
A. breaker B. inverter C. transformer D. panel
The final choice of piping material for many applications, including fuel gases, is often controlled by _____.
a. building codes b. the material cost c. personal preference d. the installing contractor
Almost all commercial lines are white pigs.
Answer the following statement true (T) or false (F)
A purge unit ____.
A. helps to provide subcooling in the condenser B. helps to provide superheat in the suction line C. relieves non-condensable gases from the system to the atmosphere D. provides capacity control