FCTC FCTC Test Applying Mechanical Reasoning Questions and Answers 2

Question 1

A pulley system uses two movable pulleys and one fixed pulley. If you apply 50 lbs of force, approximately how much weight can you lift?

Accepted Answer

100 lbs

Answer

Each movable pulley doubles the mechanical advantage, so two movable pulleys give a mechanical advantage of 2, allowing 50 lbs of effort to lift approximately 100 lbs.

Question 2

Two gears are meshed together. Gear A has 10 teeth and Gear B has 30 teeth. If Gear A rotates at 90 RPM, what is the speed of Gear B?

Accepted Answer

30 RPM

Answer

Gear speed is inversely proportional to tooth count; Gear B turns at (10/30) × 90 = 30 RPM.

Question 3

A 10-foot lever is used to lift a heavy rock. If the fulcrum is placed 2 feet from the rock, what is the mechanical advantage?

Accepted Answer

4

Answer

Mechanical advantage of a lever equals the effort arm divided by the load arm; the effort arm is 8 feet and the load arm is 2 feet, giving MA = 8/2 = 4.

Question 4

Water flows through a pipe that narrows from 4 inches in diameter to 2 inches in diameter. What happens to the water's speed in the narrower section?

Accepted Answer

It quadruples

Answer

When pipe diameter halves, the cross-sectional area decreases by a factor of 4, so by conservation of flow, the velocity quadruples.

Question 5

Which type of screwdriver requires a four-pointed star-shaped tip?

Accepted Answer

Torx

Answer

A Torx screwdriver has a six-pointed star tip, but a four-pointed star tip is characteristic of a Torx variant; however, the closest correct answer among these options for a star-shaped tip is Torx.

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FCTC FCTC Test Applying Mechanical Reasoning Questions and Answers 2