EEI TECH EEI Tech Mechanical Concept 3

Question 1

A first-class lever has the effort 4 ft from the fulcrum and the load 1 ft from the fulcrum. What is its mechanical advantage?

Accepted Answer

4

Answer

Mechanical advantage equals effort arm divided by load arm: 4/1 = 4.

Question 2

Which gear arrangement allows a driver and driven shaft to rotate in the SAME direction using gears alone?

Accepted Answer

Two gears with an idler gear between them

Answer

An idler gear placed between two gears reverses direction twice, keeping driver and driven turning the same way.

Question 3

On a screw, the distance the screw advances in one full turn is called the:

Accepted Answer

Pitch

Answer

Pitch is the linear distance traveled per complete revolution of the screw.

Question 4

A 200 lb load sits on a frictionless inclined plane 10 ft long with a vertical rise of 2 ft. What is the ideal mechanical advantage?

Accepted Answer

5

Answer

Ideal mechanical advantage equals length divided by height: 10/2 = 5.

Question 5

Which of the following best describes torque?

Accepted Answer

A rotational force that tends to cause rotation

Answer

Torque is the turning effect produced by a force acting at a distance from a pivot.

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