Combination gas valves used on standing pilot furnaces combine:
A) Gas heating control, fan operation, and air conditioning sequencing.
B) Pressure regulation, automatic gas control, and pilot safety.
C) The transformer, gas valve, and fan relay.
D) Pilot safety, fan control, and gas pressure regulation.
B
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The purpose of the ____ valve is to prevent gases from accidentally flowing out of one hose through the torch body and then into the other hose.
A. torch fuel B. reverse flow C. acetylene D. safety disc
Protect a vacuum pump by changing its oil every ____________________ hours or less.
Fill in the blank(s) with the appropriate word(s).
The evaporator in a low pressure chiller
A) operates in a vacuum B) operates between 5 and 10 psig C) is generally higher than the condenser pressure D) operates between 10 and 50 psig
In a universal curve, the current displayed decreases from approximately 100% to 0.7% of its peak value in
A) one time constant B) five time constants C) three time constants D) ten time constants