SHI Test Prep practice questions and answers 2026. Tap an option to test yourself — you'll see the correct answer and a plain-English explanation for every question. Free, no login.
Q21What is the primary purpose of pressure testing a solar heating system during installation?
✓ Correct answer: D. To identify leaks in the piping system
Pressure testing is performed to identify and fix any leaks in the system before filling it with the heat transfer fluid. This ensures the system's integrity and prevents costly leaks after commissioning.
Q22When mounting solar collectors on a sloped roof, what is the minimum recommended distance between the collector and the roof edge?
✓ Correct answer: C. 3 feet
A minimum of 3 feet clearance from roof edges is recommended for safety during installation and maintenance, as well as to comply with most building codes and wind load considerations.
Q23Which type of insulation is best suited for solar loop piping that reaches temperatures above 250°F?
✓ Correct answer: B. High-temperature mineral wool insulation
High-temperature mineral wool insulation is designed to withstand temperatures above 250°F without degrading, making it ideal for solar loop piping that can reach high stagnation temperatures.
Q24When installing an expansion tank in a glycol-based solar heating system, where should it be positioned?
✓ Correct answer: A. On the cold return line
The expansion tank should be installed on the cold return line where temperatures are lower to protect the tank's diaphragm from high temperatures that could cause premature failure.
Q25What is the recommended method for securing solar collector mounting hardware to a shingle roof?
✓ Correct answer: D. Lag screws driven into roof rafters
Lag screws driven into roof rafters provide the strongest and most secure attachment for solar collectors, ensuring they can withstand high winds and weather conditions.
Q26What personal protective equipment (PPE) is most critical when working with glycol-based heat transfer fluids?
✓ Correct answer: C. Chemical-resistant gloves and eye protection
Chemical-resistant gloves and eye protection are essential when handling glycol-based heat transfer fluids to prevent skin irritation and potential eye damage from splashes.
Q27When connecting copper piping in a solar loop, which joining method offers the most reliable high-temperature performance?
✓ Correct answer: B. Silver soldering (brazing)
Silver soldering (brazing) creates joints that can withstand the high temperatures experienced in solar heating systems, providing more reliability than standard soft solder or compression fittings.
Q28What is the proper sequence for filling a closed-loop solar heating system?
✓ Correct answer: A. Close the system, create a vacuum, introduce heat transfer fluid, pressurize
The proper sequence is to close the system, create a vacuum, introduce heat transfer fluid, and pressurize the system. This eliminates air pockets that could reduce system efficiency and cause pump cavitation.
Q29What safety device must be installed on a closed-loop solar heating system to protect against excessive pressure?
✓ Correct answer: D. Pressure relief valve
A pressure relief valve is a critical safety component that releases pressure if it exceeds safe levels, protecting the system from potential rupture or damage due to excessive pressure buildup.
Q30When installing a solar storage tank, what should be verified before connection to the solar loop?
✓ Correct answer: C. The tank's pressure rating
The tank's pressure rating must be verified to ensure it can safely handle the maximum pressure that may occur in the solar heating system, preventing potential tank failure.
Use the free SHI Test Prep sample, download the PDF, then unlock web-based timed mock exams for a full exam rehearsal.
Theory