FCTC Pulleys, Gears, and Levers 4

Question 1

A bevel gear set is used primarily to accomplish which task?

Accepted Answer

Transmit power between shafts at an angle

Answer

Increase gear speed

Answer

Transmit power between parallel shafts

Answer

Reduce noise in a gear train

Question 2

A scissors jack on a car is an example of which simple machine principle?

Accepted Answer

Lever and screw combination

Answer

Pulley system

Answer

Fixed gear train

Answer

Block and tackle

Question 3

In a clock, why are gears of different sizes used together?

Accepted Answer

To control different speeds for hour, minute, and second hands

Answer

To make the clock heavier

Answer

To reduce friction

Answer

To increase the clock's power source

Question 4

When the effort arm of a lever is shorter than the load arm, the lever provides which of the following?

Accepted Answer

Less force but greater speed and range

Answer

Greater force but less speed

Answer

Equal force and speed

Answer

Greater force and greater speed

Question 5

A worm gear is most commonly used to achieve which result?

Accepted Answer

Very large gear reductions in a compact space

Answer

High speed transmission

Answer

Parallel shaft power transfer

Answer

Equal input and output speeds

Question 6

On a bicycle, shifting to a larger rear sprocket (more teeth) while pedaling causes what effect?

Accepted Answer

Easier pedaling but slower wheel speed

Answer

Faster wheel speed with same pedaling effort

Answer

No change in wheel speed

Answer

Increased mechanical efficiency

Question 7

What does the term 'mechanical advantage' measure in simple machines?

Accepted Answer

The ratio of output force to input force

Answer

The speed at which a machine operates

Answer

The total energy consumed by the machine

Answer

The weight of the machine itself