Hvac Pretest Boma |100 Questions| With Correct Answers.

The unit used to measure electrical power is the ____. a. volt b. ampere c. watt d.ohm {Ans: c. watt}An example of a power consuming device would be a ____ while an example of a non-power consuming device would be a ___. a. single-pole single-throw switch, light bulb b. light bulb, electric motor c. electric motor, light bulb d. light bulb, single-pole single-throw switch {Ans: d. light bulb, single-pole single-throw switch}A split-phase motor can use a ____ to energize and de-energize the start winding. a. potential relay b. current relay c. centrifugal switch d. all of the above {Ans: d. all of the above}The volume of gas varies inversely with the absolute pressure, provided the temperature remains constant. This is called ____. a. Charles' Law b. Tom's Law c. Boyle's Law d. Dalton's Law {Ans: c Boyle's Law}How many Btus are required to change one pound of ice at 20°F to steam at 220°F? a. 1,304 Btu/h b. 2,608 Btu/h c. 6,520 Btu/h d. 3,912 Btu/h {Ans: a. 1,304 Btu/h}Measuring velocity pressure in a duct indicates the ___. a. volume of air through a duct b. speed at which the air is moving c. pressure