General Contractor License Mechanical, Electrical, and Plumbing Systems 2

Question 1

Under ASHRAE 62.2, which ventilation method is considered the minimum standard for indoor air quality in new residential construction?

Accepted Answer

Whole-house mechanical ventilation

Answer

Spot exhaust fans only

Answer

Opening windows daily

Answer

Kitchen exhaust recirculation only

Question 2

A GFCI outlet must be installed in which of the following locations in a residential bathroom?

Accepted Answer

All outlets regardless of location

Answer

Only within 3 feet of the sink

Answer

Any outlet within 6 feet of a water source

Answer

Only near the bathtub or shower

Question 3

What is the purpose of an air admittance valve (AAV) in a plumbing drain-waste-vent system?

Accepted Answer

Allow air into drain lines without extending vent pipes through the roof

Answer

Increase water pressure at fixtures

Answer

Prevent backflow from the sewer

Answer

Regulate hot water temperature

Question 4

According to the IRC, what is the maximum distance a P-trap can be located from its fixture drain outlet (trap arm length)?

Accepted Answer

24 inches

Answer

18 inches

Answer

36 inches

Answer

48 inches

Question 5

Which electrical conductor color is designated as the grounding conductor per NEC in the United States?

Accepted Answer

Green or bare copper

Answer

White or gray

Answer

Red

Answer

Black

Question 6

When installing forced-air HVAC ductwork, what is the primary reason supply registers and return air grilles should NOT be located in the same wall cavity?

Accepted Answer

Short-cycling occurs when conditioned air is immediately pulled back to the return

Answer

It increases duct leakage rates

Answer

It violates insulation requirements

Answer

It causes condensation on walls