The evaporator in a low-pressure chiller:
A) Operates between 5 and 10 psig. B) Operates between 10 and 50 psig.
C) Is generally higher than the condenser pressure. D) Operates in a vacuum.
D
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Answer the following statement(s) true (T) or false (F)
1. Since the current flow through a series circuit is the same at all points in the circuit, the voltage drop across any particular resistance is equal to the total circuit current plus the value of that resistor. 2. In discussing the voltage distribution of a circuit, it is not good enough to merely refer to the magnitude of the voltages, because equal consideration should be given to the polarity of the voltages. 3. The concept of a reference point is important in describing not only polarity markings but voltage levels as well. 4. In the series-aiding method of connecting voltage sources, the positive pole of one source always connects with the positive pole of another source. 5. When two voltage sources are interconnected with identical poles, such connections are known as series-opposing.
Gravity bleeding is most effective _________
A) On antilock systems B) When speed is important C) On systems that trap small pockets of air D) On systems that have residual pressure check valves
In which location would it be necessary to install a GFCI?
A. living room B. bedroom C. bathroom D. dining room
To prevent the spread of smoke and fire, fire dampers are designed to close
A) all the time except when the system is operating B) using the NO contacts of the fire alarm relay C) automatically D) manually