The controlled variable must deviate from the set point in an on/off controller to cause controlled action to occur.
Answer the following statement true (T) or false (F)
True
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A stream is being considered for a low-head hydro system. Its flow was measured at 5.1 cu. m/s. What is the flow in gal./s? (Round off to 2 decimal places.)?
Fill in the blank(s) with the appropriate word(s).
What is the major advantage of smoke detectors vs. thermal detectors?
A) Smoke detectors can be calibrated in situ. B) Smoke detectors are quicker to respond. C) Smoke detectors are less prone to dirt accumulation and easier to maintain.
Anything that occupies space and has weight is called ____________________.
Fill in the blank(s) with the appropriate word(s).
Subcooling the liquid refrigerant increases system efficiency by:
A) Ensuring a solid stream of liquid to the metering device. B) Ensuring no liquid enters the compressor. C) Adding refrigerant to the system that has already been cooled. D) Cooling off the compressor motor.