C-20 HVAC Contractor Practice Exam

Question 1

What is "latent heat" in the context of air conditioning?

Accepted Answer

Heat energy involved in condensing moisture from air without changing temperature

Question 2

The California Mechanical Code requires HVAC systems to be sized based on which load calculation method?

Accepted Answer

An approved heat loss/heat gain calculation per Manual J or equivalent

Question 3

A contractor discovers that the actual job cost exceeds the original estimate by 20%. The most likely cause is:

Accepted Answer

Inaccurate takeoffs, omissions, scope changes not covered by change orders, or unforeseen conditions

Question 4

A cooling load calculation must account for heat gain from which of the following sources?

Accepted Answer

Solar gain, conduction, internal gains, and infiltration

Question 5

What is the purpose of a Manual N calculation?

Accepted Answer

Commercial building load calculations

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