EIAT Gears, Pulleys, and Levers 5

Question 1

What is 'backlash' in a gear system?

Accepted Answer

The small gap between meshing gear teeth

Answer

Reverse rotation of the drive shaft

Answer

Gear tooth breakage under load

Answer

Vibration caused by unbalanced gears

Question 2

A compound lever system uses two levers in series. If each lever has a mechanical advantage of 4, the total mechanical advantage is:

Accepted Answer

16

Answer

4

Answer

8

Answer

2

Question 3

A traction elevator uses rope friction over the drive sheave rather than a drum winder. The primary advantage is:

Accepted Answer

Allowing unlimited travel height without rope length limits

Answer

Eliminating the need for a counterweight

Answer

Greater speed at lower cost

Answer

Simpler motor control

Question 4

Gear pitch (diametral pitch) refers to:

Accepted Answer

The number of teeth per inch of pitch diameter

Answer

The angle of the gear teeth

Answer

The rotational speed of the gear

Answer

The material hardness of the gear

Question 5

If the effort arm of a lever is 3 feet and the load arm is 1 foot, and you apply 40 lb of effort, what load is lifted?

Accepted Answer

120 lb

Answer

40 lb

Answer

80 lb

Answer

160 lb

Question 6

In a V-belt and pulley system, if the drive pulley has a 4-inch diameter and the driven pulley has a 12-inch diameter, the speed ratio is:

Accepted Answer

1:3 (driven is slower)

Answer

3:1 (driven is faster)

Answer

1:1

Answer

1:2

Question 7

When a pulley system is said to be '100% efficient,' it means:

Accepted Answer

No energy is lost to friction

Answer

The mechanical advantage equals 1

Answer

The system runs at maximum speed

Answer

The rope never stretches