Practice Test Geeks(PC) Plumber Certification Practice Test
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Troubleshooting & Diagnostics Flashcards

7 cards from real PC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Troubleshooting & Diagnostics flashcards as text

  1. A sump pump runs continuously but the pit water level keeps rising. After confirming the pump is running, the NEXT diagnostic step is to:

    Answer: Check the discharge line for an obstruction or siphon break issue

    If the pump runs but water rises, the discharge line may be blocked, kinked, or back-siphoning water into the pit, preventing effective pumping.

  2. A lavatory drain is slow even after the pop-up stopper mechanism has been cleaned. The MOST effective next step is to:

    Answer: Snake the drain through the overflow opening

    Snaking through the overflow port directly accesses the drain line below the stopper, clearing blockages that surface cleaning cannot reach.

  3. A customer reports rust-colored water only when the hot water is first used in the morning. This MOST likely indicates:

    Answer: Deteriorating anode rod inside the water heater tank

    A depleted anode rod allows the steel tank lining to corrode overnight, releasing rust particles that appear when hot water is first drawn.

  4. A toilet tank takes over five minutes to refill after flushing. The MOST likely cause is:

    Answer: Partially closed or faulty fill valve

    A partially closed supply stop or a clogged/faulty fill valve restricts water flow into the tank, dramatically increasing refill time.

  5. A plumber detects a drop in system pressure between two points in a supply line with no visible leaks. This is BEST described as:

    Answer: Pressure drop due to friction loss or a hidden restriction

    A measurable pressure differential between two points with no obvious leak indicates friction loss from a partial blockage, undersized pipe, or hidden restriction.

  6. A bathroom exhaust fan does not relieve humidity, causing persistent moisture problems. The plumber discovers the duct terminates in the attic rather than outdoors. The CORRECT fix is to:

    Answer: Extend the duct to terminate through the roof or soffit

    Exhaust ducts must terminate outside the building; terminating in the attic deposits moisture there, failing to remove it from the bathroom.

  7. A copper supply line is found to have pitting corrosion on its interior surface. This type of corrosion is MOST commonly associated with:

    Answer: Low pH (acidic) water below 6.5

    Low pH (acidic) water aggressively attacks copper pipe interiors, causing pitting corrosion that eventually leads to pinhole leaks.