The first step in starting a chilled water system is to ____.
A. activate the compressor unloading system
B. activate the chilled water circulating system
C. activate the condenser heat removal system
D. start the compressor operation sequence
Answer: B
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What kind of mounting is often used in tunnels and other underground installations where equipment is separated by long distances?
a. Wall mounting b. Direct rod mounting c. Trapeze mounting d. Center-hung mounting
Explain a flashback and what should be done if one occurs
What will be an ideal response?
A concrete wall with a surface area of 20?m2 and a thickness of 0.30 m separates conditioned room air from ambient air. The temperature of the inner surface of the wall (T1) is maintained at 25°C. (a) Determine the heat loss through the concrete wall for three thermal conductivity values of 0.75, 1, and 1.25?W/m•K and outer wall surface temperatures of T2?=???15, ??10, ??5, 0, 5, 10, 15, 20, 25, 30, and 38°C (a total of 11 data points for each thermal conductivity value). Tabulate the results for all three cases in one table. Also provide a computer-generated graph [Heat loss, vs. Outside wall temperature, T2(°C)] for the display of your results. The results for all three cases should be plotted on the same graph. (b) Discuss your results for the three cases.
What will be an ideal response?
The Chevy VOLT HV batteries are recharged by ________
A) Plugging in the 110 volt AC cable B) Allowing the engine to idle C) Driving at more than 70 mph D) None of these