Blog

Which major refrigeration cycle component absorbs heat into the liquid refrigerant causing it to boil into a vapor?

A customer has an older 80,000 Btu/h oil furnace and wants to replace it with an electric furnace. Approximately what size electric furnace will they need? (disregard efficiency) (1kw = 3413 Btu/kWh)

 Which are true of gas shut off valves? 

Select the option that completes the sentence correctly. Lenses use ____________ to focus (or disperse) light. Focusing light means making it __________ to a point.  The lens in our eyes is capable of ___________________, which enables the eye to focus on near and approaching objects.

Regarding Head Tracked Displays, please mark True or False for the items below: 1. Head Tracked Displays (HTDs) track the location of the user’s head and update the image shown based on the user’s perspective. [1]  2. Fishtank VR is not considered a type of Head Tracked Display. [2]  3. One of the pros of HTDs is that they obscure the real world. [3]  4. A con of HTDs is that they have a larger physical footprint compared to other VR systems. [4]  5. Most HTDs are not stereoscopic. [5] 

The standard type of copper tubing used most frequently in the HVAC industry is:

Heat that travels through space and heats solid objects without heating the space in between would be defined as what type of heat transfer?

Carbon monoxide in significant amounts is formed during fuel gas combustion:

When larger A/C loads require larger contactors that operate on line voltage because of their larger size, what additional component must be used to control these contactors?

Referring to the drawing above, which operating sequence description listed below would be correct assuming the system switch and cooling thermostat are closed?