EEI TECH EEI Tech Mechanical Concept 2

Question 1

Two gears mesh together. The driver gear has 10 teeth and the driven gear has 30 teeth. If the driver turns at 300 RPM, how fast does the driven gear turn?

Accepted Answer

100 RPM

Answer

Speed is inversely proportional to teeth count: 300 × (10/30) = 100 RPM.

Question 2

A lever has its fulcrum at the center, with equal arm lengths. To lift a 50 lb load, how much effort force is needed at the other end?

Accepted Answer

50 lb

Answer

With equal arm lengths the mechanical advantage is 1, so effort equals load.

Question 3

When two pulleys are connected by a belt, what determines the direction the driven pulley turns relative to the driver in an open belt drive?

Accepted Answer

Same direction

Answer

An open (uncrossed) belt drive makes both pulleys turn in the same direction.

Question 4

A hydraulic system applies 20 lb of force on a small piston of 1 sq in. The large piston has 5 sq in area. What output force is produced?

Accepted Answer

100 lb

Answer

Pressure is equal, so force scales with area: 20 × (5/1) = 100 lb.

Question 5

Which simple machine is a doorknob an example of?

Accepted Answer

Wheel and axle

Answer

A doorknob turns a small axle using a larger wheel, a classic wheel and axle.

EEI TECH Test Practice Test

EEI TECH Test Practice Test

EEI TECH EEI Tech Mechanical Concept 2