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

ASHRAE 62.2 requires whole-house mechanical ventilation in new residential construction to maintain acceptable indoor air quality continuously.

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

NEC requires GFCI protection for ALL receptacle outlets in bathrooms, regardless of their distance from water sources.

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

An AAV allows air to enter the drain system to equalize pressure and prevent siphoning of trap seals without requiring a full vent pipe penetration through the roof.

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

The IRC limits trap arm length (distance from the trap weir to the vent) to 24 inches for a 1.5-inch diameter drain to ensure adequate drainage and trap protection.

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

NEC designates green insulation or bare copper wire as the equipment grounding conductor in branch circuit wiring.

General Contractor License Practice Test

General Contractor License Practice Test

General Contractor License Mechanical, Electrical, and Plumbing Systems 2