ASHI Plumbing, Electrical & HVAC Systems 2

Question 1

What is the minimum required slope for a horizontal drain pipe in a residential plumbing system?

Accepted Answer

1/4 inch per foot

Answer

Horizontal drain pipes require a minimum slope of 1/4 inch per foot to ensure adequate flow and self-cleaning velocity.

Question 2

During a home inspection, you observe a water heater flue pipe with a 1-inch clearance to combustibles. What is the correct action?

Accepted Answer

Report it as a safety hazard requiring correction

Answer

Single-wall flue pipes must maintain at least 6 inches of clearance from combustibles, making 1 inch a reportable fire hazard.

Question 3

A 200-amp residential electrical service panel is inspected and found to have double-tapped breakers. Which statement is most accurate?

Accepted Answer

Some breakers are listed for double-tapping; the inspector should note it and defer to an electrician

Answer

Certain breakers (e.g., Square D QO series) are listed to accept two conductors, so an inspector should note the condition and recommend electrician evaluation.

Question 4

What does a high-pitched squealing noise from an HVAC air handler most commonly indicate?

Accepted Answer

Failing blower motor bearings

Answer

A high-pitched squeal from an air handler typically signals worn or failing blower motor bearings requiring service.

Question 5

Which pipe material is identified by its purple/lavender color and is commonly found in older mobile homes?

Accepted Answer

Polybutylene

Answer

Polybutylene pipe, often gray but sometimes marked with purple fittings, was widely used 1978–1995 and is known for premature failure.

(ASHI) ASHI Certified Home Inspector Practice Test

(ASHI) ASHI Certified Home Inspector Practice Test

ASHI Plumbing, Electrical & HVAC Systems 2