Plumbing
100: This flexible, rubber-cupped tool uses suction to clear minor clogs in sinks and toilets.
Answer: What is a plunger?
100: Concrete is made of three main ingredients: water, aggregate, and this binding powder.
Answer: What is Portland Cement?
100: MIG stands for this, referring to the type of gas used to protect the weld puddle.
Answer: What is Metal Inert Gas?
100: This is the common name for Shielded Metal Arc Welding.
Answer: What is Stick welding?
100: To prevent a dangerous explosion, an Acetylene tank should never be stored or used in this position.
Answer: What is horizontal (or laying down)?
200: This common blue or white tape is wrapped around pipe threads to ensure a watertight seal.
Answer: What is Teflon tape (or PTFE tape)?
200: These steel rods are embedded in concrete to provide tensile strength and prevent cracking.
Answer: What is rebar?
200: This part of the MIG welder feeds the wire through the cable and out the nozzle.
Answer: What is the drive roll (or wire feeder)?
200: On a 7018 electrode, the first two digits (70) represent this many thousands of pounds of tensile strength per square inch.
Answer: What is 70,000 PSI?
200: The oxygen hose is color-coded green, while the acetylene hose is always this color.
Answer: What is red?
300: This "U" or "S" shaped pipe under a sink holds water to prevent sewer gases from entering the home.
Answer: What is a P-trap?
300: This term describes the process of maintaining moisture and temperature in new concrete to reach full strength.
Answer: What is curing?
300: This is the most common gas mixture used for MIG welding carbon steel.
Answer: What is 75% Argon / 25% CO2 (C25)?
300: This hardened layer forms on top of a finished weld and must be chipped away.
Answer: What is slag?
300: This type of flame is achieved when there is a perfect one-to-one balance of oxygen and acetylene.
Answer: What is a neutral flame?
400: This method of joining copper pipes involves heating a fitting and melting a filler metal into the joint.
Answer: What is sweating (or soldering)?
400: This test measures the consistency and workability of a concrete mix before it is poured.
Answer: What is a slump test?
400: If your weld has "porosity" (tiny holes), it is most likely caused by a lack of this.
Answer: What is shielding gas?
400: This occurs when the arc wanders from its intended path, usually caused by magnetic fields in DC welding.
Answer: What is arc blow?
400: This safety device is designed to stop a flame from traveling back up the hoses into the regulators.
Answer: What is a flashback arrestor?
500: In a water heater, this sacrificial rod is designed to corrode so the tank itself doesn’t rust.
Answer: What is an anode rod?
500: This is the standard chemical reaction that occurs when water and cement mix, creating heat.
Answer: What is hydration?
500: MIG welding, this term refers to the distance between the contact tip and the workpiece.
Answer: What is electrode stick-out (or CTWD)?
500: This specific electrode is known as a "Fast-Freeze" rod, commonly used for pipe root passes.
Answer: What is 6010?
500: This is the maximum safe "free" pressure (PSI) for Acetylene gas before it becomes unstable.
Answer: What is 15 PSI?