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

300 RPM

Answer

900 RPM

Answer

30 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

25 lb

Answer

100 lb

Answer

12.5 lb

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

Opposite direction

Answer

It stops

Answer

Random 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

20 lb

Answer

4 lb

Answer

25 lb

Question 5

Which simple machine is a doorknob an example of?

Accepted Answer

Wheel and axle

Answer

Inclined plane

Answer

Pulley

Answer

Wedge

Question 6

If a spring stretches 2 inches under a 10 lb load, how far will it stretch under a 25 lb load (assuming it stays within its elastic limit)?

Accepted Answer

5 inches

Answer

2 inches

Answer

10 inches

Answer

2.5 inches

Question 7

Which type of friction must be overcome first to start a stationary object moving?

Accepted Answer

Static friction

Answer

Kinetic friction

Answer

Rolling friction

Answer

Fluid friction