Tools and Testing Instruments Flashcards
6 cards from real G3 practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Tools and Testing Instruments flashcards as text
How is a U-tube manometer read correctly?
Answer: Read the difference between water levels in both columns
The reading is the difference between the two water levels in inches of water column.
What is a multimeter used for in gas appliance diagnostics?
Answer: Measuring voltage, current, and resistance in electrical components
It measures electrical properties of thermocouples, gas valves, igniters, and control circuits.
How should soap bubble solution be properly used for leak testing?
Answer: Apply directly to each joint with a brush, then watch for bubbles
Apply to each connection point individually and observe carefully for bubble formation.
What does a clamp-on ammeter measure?
Answer: Electrical current without breaking the circuit
It measures current flowing through a wire by clamping around the conductor.
What is a temperature probe used for in gas appliance service?
Answer: Measuring temperatures of flue gases, heat exchangers, and ductwork
Temperature readings at various points help evaluate performance, efficiency, and safety.
Why must gas testing instruments be calibrated regularly?
Answer: To ensure accurate readings affecting safety decisions and code compliance
Accuracy directly affects safety decisions—uncalibrated instruments can miss dangerous conditions.