When should a technician read the SDS for a particular refrigerant?
A) Before using the refrigerant B) On the way to the hospital
C) After being exposed to the refrigerant D) In the event of an emergency
A
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Fuses and circuit breakers provide the needed protection for motors
Indicate whether the statement is true or false.
Traditionally, seal shafts consisted of _____
a. rope or braided style packing in a stuffing box b. O-rings and gaskets around a shaft c. a spring-loaded shaft seal d. a stuffing box packed with grease
The law that states that "energy is neither created or destroyed, but can be converted from one form to another" is called the ______________________________.
Fill in the blank(s) with the appropriate word(s).
Answer the following statement(s) true (T) or false (F)
1. For current-generation hydronic heating systems, the controlled variable is usually indoor air temperature. 2. Most of the closed-loop control systems used for hydronic heating continually seek to eliminate any error that exists between the target value and measured value of the controlled variable. 3. Heat output from the heat emitter occurs whenever the supply water temperature equals the room air temperature. 4. The combination of near-continuous circulation and very gradual changes in water temperature tends to maximize expansion noises from the distribution piping and heat emitters. 5. Most heat source reset controllers have an adjustable minimum supply temperature.