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Mechanical Comprehension Flashcards

7 cards from real EIAT 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 flashcards as text

  1. A safety gear (progressive safety) on an elevator is activated by:

    Answer: Overspeed detected by the governor rope

    The governor monitors cab speed and, if overspeed occurs, trips the governor rope which mechanically activates the safety gear to grip the guide rails.

  2. What is the primary purpose of a buffer at the bottom of an elevator pit?

    Answer: Absorb the kinetic energy of the cab or counterweight at the end of travel

    Buffers (oil or spring type) are energy-absorbing devices designed to stop a descending cab or counterweight that travels beyond its normal limit.

  3. In a simple pulley system with a fixed pulley and a movable pulley, the mechanical advantage is:

    Answer: 2

    A system with one fixed and one movable pulley provides a mechanical advantage of 2, meaning half the effort is needed to lift the load.

  4. Viscosity of hydraulic oil in an elevator system affects:

    Answer: The flow resistance and heat generation in the hydraulic circuit

    Higher viscosity increases flow resistance and heat generation; lower viscosity reduces efficiency and can cause leakage — proper viscosity ensures smooth, efficient operation.

  5. A driven gear has 60 teeth and the driving gear has 20 teeth. The gear ratio (output:input) is:

    Answer: 3:1 speed reduction

    Gear ratio = driven teeth / driving teeth = 60/20 = 3:1, meaning the output shaft turns at one-third the speed of the input shaft.

  6. Thermal expansion is an important consideration in elevator guide rails because:

    Answer: Rail length changes with temperature and must be accommodated to prevent buckling

    Steel rails expand when heated; splice joints include expansion gaps so rails can grow without buckling or binding guide shoes.

  7. Which component converts the rotational motion of the elevator motor into the linear motion needed to raise the cab?

    Answer: The drive sheave and ropes

    The drive sheave (grooved pulley) rotates with the motor; the hoisting ropes wrapped over it convert that rotation into linear movement of the cab and counterweight.