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Aptitude Test Mechanical Principles and Pulleys Questions and Answers Flashcards

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

Read the first 6 Aptitude Test Mechanical Principles and Pulleys Questions and Answers flashcards as text

  1. A block-and-tackle system has 4 rope segments supporting the load. If the load weighs 400 lbs, what force must be applied (ignoring friction)?

    Answer: 100 lbs

    With 4 supporting rope segments, the mechanical advantage is 4. Force = 400 ÷ 4 = 100 lbs.

  2. Which type of lever is a wheelbarrow an example of?

    Answer: Second-class lever

    A wheelbarrow has the load between the fulcrum (wheel) and the effort (handles), making it a second-class lever.

  3. Two gears are meshed together. Gear A has 20 teeth and Gear B has 60 teeth. If Gear A rotates at 180 RPM, at what speed does Gear B rotate?

    Answer: 60 RPM

    Speed ratio is inverse of tooth ratio. Gear B speed = 180 × (20/60) = 180 × 1/3 = 60 RPM.

  4. Which simple machine is a screw considered?

    Answer: A wedge wrapped around a cylinder

    A screw is an inclined plane (wedge) wrapped in a helical path around a cylinder.

  5. A fixed pulley is used to lift a 200-lb load. What effort force is required?

    Answer: 200 lbs

    A fixed pulley only changes the direction of force, not the magnitude. The effort equals the load: 200 lbs.

  6. If a 6-foot lever is used with the fulcrum 2 feet from the load, and a 300-lb load is placed on the short end, what effort is needed at the other end?

    Answer: 150 lbs

    Load arm = 2 ft, effort arm = 4 ft (6-2). MA = 4/2 = 2. Effort = 300 ÷ 2 = 150 lbs.