All of the following are generally factors in calculating commercial heating and cooling loads except _____
a. extensive use of steel and/or glass facades
b. large, open areas
c. significant variations in people load
d. estimating instructions in ACCA Manual J
d
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Which of the following statements about centrifugal pumps is true?
a. With the valve in the discharge piping closed, the rotating impeller churns in the water causing the pressure at the outlet to rise to the shut-off head. b. If the discharge valve is gradually opened, allowing increasing flow of water, the pump head decreases. c. When the pump lifts water from a reservoir into a piping system; the resistance of flow at various rates of discharge is described by a system head curve. d. With increasing rate of discharge, pump efficiency rises to an optimum value and then slowly falls. e. All of the above.
A volt-ohm-milliammeter (VOM) is monitoring the output of a dc power supply. The VOM is set on the 25 V range and the meter shows 20.0 V. What is the internal resistance of the VOM if it has a 20 k?/V rating?
A) 400 k? B) 900 k? C) 500 k? D) 20 k?
If a transitional piece does not have fold lines, it is developed in the same manner as any other triangulation development.
Answer the following statement true (T) or false (F)
What is the correct tool for measuring input shaft and output shaft endplay?
A) Dial caliper B) Dial indicator C) Micrometer D) None of these