WTMA Levers, Pulleys, and Gears 4

Question 1

A lever with a mechanical advantage greater than 1 means:

Accepted Answer

The load arm is shorter than the effort arm

Answer

When the effort arm is longer than the load arm, the mechanical advantage exceeds 1, multiplying the input force.

Question 2

A rack and pinion converts:

Accepted Answer

Rotational motion to linear motion (and vice versa)

Answer

A rack and pinion can convert rotational to linear motion and linear to rotational, depending on which part is driven.

Question 3

You need to raise a 500 lb engine block using a rope and pulley. Which setup requires the LEAST effort?

Accepted Answer

A pulley system with 5 rope segments supporting the load

Answer

Five supporting rope segments give a mechanical advantage of 5, requiring only 100 lb of effort versus more in all other options.

Question 4

Gear backlash refers to:

Accepted Answer

The slight gap between meshing gear teeth

Answer

Backlash is the small clearance between gear teeth when they mesh, allowing for thermal expansion and lubrication.

Question 5

A bevel gear set is used to:

Accepted Answer

Change the direction of rotation between intersecting shafts

Answer

Bevel gears transmit power between shafts that intersect at an angle, typically 90 degrees.

WTMA - Wiesen Test of Mechanical Aptitude Practice Test