Define the term “plenum.”
What will be an ideal response?
The plenum in CTW-302 is the open area directly under the fan. In an induced draft, cross flow cooling tower, the velocity of the air creates a partial vacuum under the fan as it expels the vapor enriched air.
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IDENTIFY TEST PROCESS SYMBOLS AND DIAGRAMS
The maximum safe concentration of carbon dioxide (CO2) in an occupied space is _____.
a. 900 ppm b. 1,000 ppm c. 1,200 ppm d. 1,500 ppm
Which of the following is a current transformer?
a. sealed b. oil-filled c. vacuum d. outdoor
Answer the following statement(s) true (T) or false (F)
1. Electromechanical relays, contactors, and motor starters operate by dissimilar principles, as indicated by differences in the amount of current that each associated contact must switch. 2. The action of relay contacts is to switch something “on” or “off ” depending on the configuration. 3. The silicon-controlled rectifier (SCR) is one of the most popular solid-state devices for controlling large and small electrical power loads. 4. The SCR conducts when the voltage across it is in the reverse direction, and also conducts in the forward direction when the proper signal (voltage) is applied to the gate terminal 5. Mechanical timers use air, a diaphragm, and an operating solenoid to cause a time delay.