On a building with a two-stage heating thermostat, the first stage closes at the setpoint and the next stage closes:

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

Mark True or False regarding tracking systems. 1. Inertial Measurement Units merge accelerometers and gyroscopes, often alongside a magnetometer. [1] 2. For tracking in VR, we typically care about linear acceleration or angular velocity, not position and orientation. [2] 3. Integration converts measurements of velocity or acceleration in positions and orientations. [3] 4. Drift is typically corrected by additional sensors. [4] 5. Mechanical Linkage Systems use sensors at joints to detect angles, and compute a position. [5]  

Which of the following combustible gases is lighter than air?

 Vent connectors shall not be increased in size more than________ greater than the listed appliance categorized vent diameter, flue collar, or draft hood outlet.

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?

In the HVAC and plumbing industry, steel pipe is usually joined by _______________ pipe threads.

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

The approximate heating value of natural gas is:

What type of flame is characteristic of incomplete combustion?