In a water-cooled condenser, what do an increase in head pressure and a decrease in temperature difference across the condenser indicate?
A) Undersized condenser B) Low water flow
C) Scaling on tubing D) Low-pH water
C
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Preparing a quantity takeoff of concrete work requires the estimator to measure a combination of items-some of which are shown on the drawings, while others are to be inferred from the drawings.
Answer the following statement true (T) or false (F)
When we have multiple power sources and use the superposition theorem to determine just how much each power source contributes toward the branch currents, we do this by considering ____.
a. only one power source at a time b. all the power sources at one time c. at least two power sources at a time d. only half of the power sources
When the heating thermostat contact closes, a circuit exists to the time delay relay (TDR) and ____.
a. condensing unit b. door interlock c. lock-out relay d. draft motor relay (DMR)
Which of the following is not a factor that influences the amount of draft necessary?
A. the quality of the pattern B. the height of vertical surfaces C. the type of material being used D. the ease with which the pattern must be drawn from the mold E. none of the above