What types of machines use sequence control?
What will be an ideal response?
Sequence control is used by such machines as hydraulic presses that must have a high pressure pump operating before they can be used, or by some air conditioning systems that require that the blower be in operation before the compressor starts.
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A pulsating sound coming from an oil furnace indicates _____.
a. the flame is touching the combustion chamber b. a defective blower c. under-firing d. soot buildup on the heat exchanger
What are some advantages of common use grazing?
What will be an ideal response?
The cluster gear is supported by ________
A) Bushings B) Roller bearings between the countershaft and the case C) Either A and B D) Neither A nor B
In which stage of a typical refrigeration cycle does high-pressure gas change state to become a high-pressure liquid?
A. compression stage B. condensation stage C. expansion stage D. evaporation stage