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Mechanical Reasoning Principles Questions and Answers Flashcards

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

Read the first 7 Mechanical Reasoning Principles Questions and Answers flashcards as text

  1. A centrifugal pump's impeller speed is doubled. By approximately what factor does the pump's flow rate change?

    Answer: 2×

    By the centrifugal pump affinity laws, flow rate is directly proportional to impeller speed.

  2. Which material would be the best thermal insulator in a mechanical system?

    Answer: Fiberglass

    Fiberglass has very low thermal conductivity, making it an excellent insulator compared to metals.

  3. A shaft transmits 10 hp at 1,000 RPM. If the speed is reduced to 500 RPM while maintaining the same power, the torque will:

    Answer: Double

    Power = Torque × Speed; if speed halves and power stays constant, torque must double.

  4. A pipe joint leaks when pressure increases. The most likely cause is:

    Answer: A failed or worn gasket

    Gaskets create the seal between pipe flanges; a worn or damaged gasket will fail under increased pressure.

  5. In a simple electrical circuit, if the resistance is doubled while voltage stays the same, the current will:

    Answer: Be halved

    By Ohm's Law, I = V/R; if R doubles and V is constant, current (I) is cut in half.

  6. A ball valve is preferred over a globe valve when the primary requirement is:

    Answer: Full-open or full-closed shutoff with minimal pressure drop

    Ball valves open fully with a quarter-turn, offering very low pressure drop and fast shutoff.

  7. A class 2 lever has the load between the fulcrum and the effort. A common example is:

    Answer: A wheelbarrow

    In a wheelbarrow, the wheel is the fulcrum, the load sits in the bin between the wheel and the handles where effort is applied.