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Mechanical Comprehension Test Flashcards

7 cards from real ASVAB 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 Comprehension Test flashcards as text

  1. A boat propeller converts engine torque into thrust. If the pitch of the propeller increases while RPM stays the same, what happens?

    Answer: The boat moves farther per revolution but requires more torque

    Higher pitch means more water moved per revolution, increasing thrust potential but also requiring more torque from the engine.

  2. A pipe narrows from a diameter of 4 cm to 2 cm. If water flows at 1 m/s in the wide section, what is the speed in the narrow section?

    Answer: 4 m/s

    By continuity (A₁v₁ = A₂v₂), area decreases by factor 4 (radius halved), so speed increases 4×: 1 × 4 = 4 m/s.

  3. A lever is used to lift a 300-lb rock. The rock is 2 feet from the fulcrum and effort is applied 6 feet from the fulcrum. How much effort force is needed?

    Answer: 100 lbs

    By the lever principle: effort × 6 = 300 × 2, so effort = 600/6 = 100 lbs.

  4. Which material property describes a material's ability to be drawn into a wire without breaking?

    Answer: Ductility

    Ductility is the property that allows a material to be stretched into thin wires under tensile stress.

  5. Two blocks are connected by a rope over a frictionless pulley. Block A (10 kg) is on a frictionless surface; Block B (5 kg) hangs vertically. What happens when released?

    Answer: Block A slides toward the pulley as Block B falls

    Block B's weight pulls the rope, accelerating Block A horizontally toward the pulley while Block B descends.

  6. A flywheel stores energy by spinning at high speed. What does increasing the flywheel's rotational inertia allow it to do?

    Answer: Store more energy at the same RPM

    Rotational KE = ½Iω²; greater rotational inertia (I) means more energy stored at any given angular speed.

  7. In a belt-and-pulley system, the drive pulley has a radius of 5 cm and the driven pulley has a radius of 25 cm. If the drive pulley turns at 500 RPM, what is the driven pulley's speed?

    Answer: 100 RPM

    Belt speed is equal on both pulleys; driven RPM = drive RPM × (drive radius / driven radius) = 500 × (5/25) = 100 RPM.