Technical Skills & Application 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 Technical Skills & Application flashcards as text
When using a micrometer to measure shaft diameter, which technique ensures the most accurate reading?
Answer: Use the ratchet stop to apply consistent measuring pressure
The ratchet stop limits measuring force to a consistent level, preventing over-tightening that would compress the part and give a falsely small reading.
A journeyman electrician must calculate the ampacity of a conductor. The formula is based on which primary factors?
Answer: Conductor material, cross-sectional area, and ambient temperature rating
Ampacity depends on conductor material (copper vs aluminum), cross-sectional area (AWG/kcmil), and the temperature rating of the insulation in the installation environment.
In welding, what is the purpose of a preheat treatment applied to base metal before welding?
Answer: To reduce the hardening and cracking risk by slowing post-weld cooling
Preheating slows the cooling rate after welding, reducing thermal gradients that cause hydrogen-induced cracking and martensitic hardening in high-carbon or alloy steels.
An apprentice plumber is installing a drain line and needs to maintain a proper slope for gravity drainage. What is the standard minimum slope per foot for a 3-inch drain line?
Answer: 1/4 inch per foot
The International Plumbing Code requires a minimum slope of 1/4 inch per foot for drain lines 3 inches and smaller to ensure self-scouring velocity.
Which type of bearing is best suited for absorbing both radial and axial (thrust) loads simultaneously in a gearbox application?
Answer: Angular contact ball bearing
Angular contact ball bearings are designed with an offset contact angle that allows them to support combined radial and axial loads, making them standard for gearbox output shafts.
When reading a hydraulic circuit diagram, a symbol showing a rectangle with a single arrow pointing in one direction represents which component?
Answer: A fixed-displacement hydraulic pump
In ISO hydraulic symbols, a rectangle (or circle) with one arrow pointing inward represents a fixed-displacement pump; one arrow pointing outward represents a fixed-displacement motor.
An HVAC technician measures superheat in a refrigeration system. Superheat is defined as the temperature difference between which two values?
Answer: Suction line temperature and the saturation temperature at suction pressure
Superheat is measured at the suction line: actual suction line temperature minus the saturation (boiling) temperature corresponding to suction pressure — confirming full vaporization before the compressor.