Question 1
On a psychrometric chart, what does the dew-point temperature (DPT) represent for a given moist-air state point?
Correct Answer:
The dry-bulb temperature at which the air is saturated at that humidity ratio
Question 2
Air at 75°F DBT and 50% RH has a humidity ratio of approximately 0.00925 lb_w/lb_da and an enthalpy of about 28.1 BTU/lb_da. If this air is sensibly heated to 95°F (no moisture added), what happens to the relative humidity?
Correct Answer:
RH decreases because saturation pressure rose while vapor pressure stayed the same
Question 3
A space requires 20,000 BTU/h of sensible cooling and 5,000 BTU/h of latent cooling. What is the sensible heat ratio (SHR) of the space load?
Correct Answer:
0.80
Question 4
Outdoor air at 95°F DBT and W = 0.018 lb_w/lb_da is mixed with return air at 75°F DBT and W = 0.010 lb_w/lb_da in the ratio 25% OA / 75% RA by mass. What is the mixed-air dry-bulb temperature?
Correct Answer:
80°F
Question 5
A cooling coil has an entering condition of 80°F DBT / 67°F WBT and a leaving condition of 55°F DBT / 54°F WBT. The apparatus dew-point (ADP) is 50°F. What is the coil bypass factor (BF)?
Correct Answer:
0.17
Question 1
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About this Exam

Prepare with the PE Mechanical HVAC Practice Questions - PE Mechanical HVAC and Refrigeration Exam practice quiz. This question bank includes 100 questions covering cooling, heat, ashrae, standard, and temperature. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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PE Mechanical HVAC Practice Questions - PE Mechanical HVAC and Refrigeration Exam

This practice set contains 100 questions from the matching question bank and focuses on cooling, heat, ashrae, standard, and temperature. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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