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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 lever 10 feet long has its fulcrum 2 feet from one end. A 200 lb load is placed at the short end. What force must be applied at the long end to balance it?

    Answer: 50 lbs

    Torque balance: Load × short arm = Effort × long arm → 200 × 2 = Effort × 8, so Effort = 400/8 = 50 lbs.

  2. Which of the following would cause a V-belt drive to slip on its pulley?

    Answer: Insufficient belt tension

    A V-belt requires adequate tension to generate the friction needed to transfer torque without slipping.

  3. An inclined plane is 12 feet long and rises 3 feet. What is its mechanical advantage?

    Answer: 4

    Mechanical advantage of an inclined plane = length / height = 12 / 3 = 4.

  4. Two gears are in mesh. Gear A has 20 teeth and rotates at 600 RPM. Gear B has 60 teeth. What is the speed of Gear B?

    Answer: 200 RPM

    Speed ratio = teeth of driver / teeth of driven = 20/60, so Gear B speed = 600 × (20/60) = 200 RPM.

  5. A pressure gauge on a boiler reads 150 PSI. If the boiler's safety valve is set to 175 PSI, what is the pressure margin before the valve opens?

    Answer: 25 PSI

    Pressure margin = safety valve setting − current pressure = 175 − 150 = 25 PSI.

  6. A screw has 16 threads per inch. How far does it advance into a material with one full revolution?

    Answer: 1/16 inch

    Pitch (advance per revolution) = 1 / threads per inch = 1/16 inch.

  7. When two springs with the same spring constant are connected in parallel, the combined spring constant is:

    Answer: Twice the individual spring constant

    Springs in parallel add their constants: k_total = k₁ + k₂ = 2k for identical springs.