Trade Theory Flashcards
7 cards from real AIT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Trade Theory flashcards as text
Which hand tool is used to measure and mark a 90-degree angle on material?
Answer: Speed square or try square
A speed square or try square is specifically designed to check or mark 90-degree (right) angles on material, making it essential for layout work in many trades.
In welding, what is the purpose of a flux coating on a shielded metal arc welding (SMAW) electrode?
Answer: To protect the molten weld pool from atmospheric contamination
The flux coating on SMAW electrodes melts during welding to create a protective gas shield and slag layer that prevents oxygen and nitrogen from contaminating the molten weld pool.
What is the main function of a pressure relief valve in a hydraulic or plumbing system?
Answer: To prevent system pressure from exceeding a safe maximum
A pressure relief valve opens automatically when system pressure reaches a preset maximum, releasing excess pressure to prevent equipment damage or dangerous ruptures.
When measuring with a vernier caliper, what does the vernier scale allow you to do?
Answer: Read fractional measurements more precisely than the main scale alone
The vernier scale on a caliper allows the user to read fractional increments (typically 0.02 mm or 0.001 inch) that fall between the main scale divisions, greatly increasing measurement precision.
In construction trades, what is the purpose of a vapor barrier?
Answer: To prevent moisture from migrating through walls, floors, or ceilings
A vapor barrier (or vapor retarder) is a material used to slow or prevent moisture vapor from passing through building assemblies, preventing condensation and moisture damage within walls and structures.
What type of thread is most commonly used on plumbing pipe fittings in North America?
Answer: National Pipe Taper thread (NPT)
National Pipe Taper (NPT) threads are the standard thread type used on most plumbing pipe fittings in North America; the tapered design creates a seal as the fitting is tightened.
What does the term 'load-bearing' mean when referring to a wall in a building?
Answer: The wall supports the weight of the structure above it
A load-bearing wall is a structural element that carries and transfers the weight of the floors, roof, and other structural components above it down to the foundation.