Answer the following statement(s) true (T) or false (F)
1.Programmable logic controllers are all programmed the same way.
2. As a general rule, for programmable logic controllers, coils can be connected in a series.
3. As far as programmable logic controllers are concerned, the program will scan in the order that it is entered.
4. Programmable logic controllers know what device is connected to which input.
5. Programmable logic controllers operate by scanning the program that has been entered into memory.
1. False
2. False
3. True
4. False
5. True
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The dampers on registers are normally not used for balancing the system airflow because:
A) They will produce excessive noise in the space. B) They do not seal off tightly enough to be used for balancing dampers. C) Most registers do not have integral dampers. D) They are more difficult to adjust than dampers in the duct system.
How can water-tubing fouling be prevented in tube-and-shell water-cooled condenser systems?
A) Through annual chemical treatment of the water B) Through a monthly external scrubbing with bleach C) Through annual draining of the water, removing access plates, and running brushes through the water tubes D) Through annual draining and replacement of the water in the condenser and annual chemical treatment of the water
What does software such as Bendix ACom allow the technician to perform on an ABS circuit?
A. read fault codes B. troubleshoot both brake and ABS failures C. analyze brake performance D. all of the above
Define critical point
A) The pressure and temperature where a solid and a liquid have the same properties B) The pressure and temperature where a substance can exist simultaneously as a solid, a liquid, and a gas in thermal equilibrium C) The pressure and temperature at which gas and liquid have the same properties D) The pressure and temperature above which a substance will cease to exist