Evaluating Mechanisms: Enhance Your Design Technology Skills

Question 1

Which factor does not affect the efficiency of a mechanism?

Accepted Answer

Color

Answer

Friction

Answer

Weight

Answer

Power

Question 2

Which material would be most suitable for making a gear?

Accepted Answer

Metal

Answer

Wood

Answer

Plastic

Answer

Fabric

Question 3

Which type of friction occurs when two surfaces slide past each other?

Accepted Answer

Sliding friction

Answer

Rolling friction

Answer

Fluid friction

Answer

Static friction

Question 4

How does lubrication affect friction?

Accepted Answer

It reduces friction

Answer

It increases friction

Answer

It does not affect friction

Answer

It makes friction unpredictable

Question 5

What is the term for the force that resists movement between two surfaces?

Accepted Answer

Friction

Answer

Gravity

Answer

Inertia

Answer

Tension

Question 6

Which of these is often used to change turning motion into straight-line motion?

Accepted Answer

Rack and pinion

Answer

Gear train

Answer

Pulley

Answer

Lever

Question 7

What is a possible problem with using a belt drive in a mechanism?

Accepted Answer

It might slip, causing power loss

Answer

It needs to be fixed often

Answer

It is not very efficient

Answer

It is only good for slow speeds

Question 8

What is the purpose of a flywheel in a mechanism?

Accepted Answer

To store and release energy

Answer

To stop it vibrating

Answer

To change which way it turns

Answer

To make it stronger

Question 9

When do we say sliding friction happens?

Accepted Answer

When two surfaces are moving past each other

Answer

When two surfaces are not moving

Answer

When two surfaces are rolling past each other

Answer

When two surfaces are rubbing against each other with lots of force

Question 10

What is the best kind of mechanical advantage for a mechanism?

Accepted Answer

Greater than 1

Answer

Less than 1

Answer

Equal to 1

Answer

Zero

Question 11

What is the job of a cam in a mechanism?

Accepted Answer

Change a spinning motion into a straight motion

Answer

Change how fast something spins

Answer

Make something stronger

Answer

Make something less likely to rub

Question 12

What does a flywheel do in a mechanism?

Accepted Answer

Store energy

Answer

Make it shake less

Answer

Make it go faster

Answer

Change the direction it's spinning

Question 13

A cam in a mechanism is designed to:

Accepted Answer

Convert rotary motion into linear motion

Answer

Create a smooth, continuous motion

Answer

Transfer force between gears

Answer

Change the direction of motion

Question 14

Which type of gear is best for transferring motion over a long distance with minimal energy loss?

Accepted Answer

Helical gear

Answer

Spur gear

Answer

Bevel gear

Answer

Worm gear

Question 15

A lever is used primarily to:

Accepted Answer

Amplify force

Answer

Change the direction of motion

Answer

Transmit motion

Answer

Increase speed

Question 16

The purpose of a flywheel in a mechanism is to:

Accepted Answer

Store kinetic energy

Answer

Reduce vibrations

Answer

Amplify force

Answer

Change the direction of motion

Question 17

When evaluating the efficiency of a mechanism, which factor should NOT be considered?

Accepted Answer

Appearance

Answer

Friction

Answer

Load

Answer

Speed

Question 18

What is the main purpose of a flywheel in a mechanism?

Accepted Answer

To store and release energy

Answer

To minimize friction

Answer

To accelerate speed

Answer

To reverse direction

Question 19

What is the primary function of a cam in a mechanism?

Accepted Answer

Converts rotary motion into linear motion

Answer

Converts linear motion into rotary motion

Answer

Increases speed

Answer

Reduces friction

Question 20

What is the main advantage of using a ball bearing in a mechanism?

Accepted Answer

Reduces friction

Answer

Increases speed

Answer

Enhances durability

Answer

Provides lubrication

Question 21

What is the function of a cam mechanism?

Accepted Answer

Converting rotary motion into linear motion

Answer

Increasing the speed of a mechanism

Answer

Changing the direction of force

Answer

Reducing friction

Question 22

What is the main purpose of a bearing in a mechanism?

Accepted Answer

Reducing friction

Answer

Increasing speed

Answer

Changing the direction of force

Answer

Storing energy

Question 23

What is the primary function of a lever?

Accepted Answer

Amplifying force

Answer

Changing the direction of force

Answer

Storing energy

Answer

Reducing friction

Question 24

A mechanism with a mechanical advantage of 2 means that:

Accepted Answer

It can lift twice as much weight with the same effort.

Answer

It takes twice as much effort to lift the same weight.

Answer

It moves twice as far with the same effort.

Answer

It is twice as fast as a similar mechanism.

Question 25

What is the job of a gear ratio in a mechanism?

Accepted Answer

To change how fast something turns

Answer

To change the direction something turns

Answer

To make something turn more powerfully

Answer

To reduce friction

Question 26

What is the main purpose of a cam in a mechanism?

Accepted Answer

To turn spinning motion into straight motion

Answer

To turn straight motion into spinning motion

Answer

To make something turn more powerfully

Answer

To reduce friction

Question 27

Which of these is NOT a common material used to build mechanisms?

Accepted Answer

Glass

Answer

Metal

Answer

Plastic

Answer

Wood

Question 28

What is the difference between a lever and a pulley?

Accepted Answer

Levers use force, while pulleys change direction.

Answer

Pulleys use force, while levers change direction.

Answer

Levers are used for lifting heavy things, while pulleys are used for changing direction.

Answer

Pulleys are used for lifting heavy things, while levers are used for changing direction.

Question 29

Which test would best measure the efficiency of a lever?

Accepted Answer

Timing how long it takes to lift an object

Answer

Observing the smoothness of the lever's movement

Answer

Measuring the distance moved by the lever

Answer

Determining the angle of the lever's movement

Question 30

A mechanism has an overall efficiency of 75%. What does this mean?

Accepted Answer

75% of the input energy is transformed into useful output energy

Answer

75% of the output energy is lost to friction

Answer

75% of the input energy is converted into heat

Answer

75% of the mechanism is made of recycled materials

Question 31

What's the purpose of a cam in a mechanism?

Accepted Answer

To change rotary motion into linear motion

Answer

To amplify force

Answer

To change the direction of motion

Answer

To reduce friction

Question 32

Which tool is best for measuring the angle of a cam?

Accepted Answer

Protractor

Answer

Ruler

Answer

Stopwatch

Answer

Calipers

Question 33

Which of these is **not** a factor to consider when evaluating the efficiency of a mechanism?

Accepted Answer

Appearance of the mechanism

Answer

Effort needed to operate it

Answer

Speed at which it operates

Answer

Ease of maintaining it

Question 34

What is the main purpose of a ratchet in a machine?

Accepted Answer

To stop movement in one direction

Answer

To make the machine spin faster

Answer

To change spinning motion into sliding motion

Answer

To decrease the amount of friction

Question 35

What does a cam do in a mechanism?

Accepted Answer

Changes spinning motion to back-and-forth motion

Answer

Increases the turning force of a shaft

Answer

Slows down a mechanism

Answer

Provides a steady point for spinning

Question 36

Which material would be best for making a lever in a machine?

Accepted Answer

Metal

Answer

Wood

Answer

Plastic

Answer

Cloth

Question 37

What is the main purpose of a flywheel in a machine?

Accepted Answer

To store and release energy when needed

Answer

To increase the speed of spinning

Answer

To decrease the torque needed to operate the machine

Answer

To prevent the machine from overheating

Question 38

What does a cam follower in a mechanism do?

Accepted Answer

Makes a turning motion into a straight-line motion

Answer

Makes moving parts rub together less

Answer

Makes the mechanism stronger

Answer

Changes the direction in which something moves

Question 39

What does a flywheel do in a mechanism?

Accepted Answer

Stores and releases energy

Answer

Stops it from shaking

Answer

Changes the direction of movement

Answer

Makes it stronger

Question 40

What is the job of a lubricant in a mechanism?

Accepted Answer

Stops parts rubbing together

Answer

Stops it from rusting

Answer

Cools moving parts

Answer

Makes it work better

Question 41

When evaluating how well a mechanism works, which of these should NOT be considered?

Accepted Answer

How durable it is

Answer

How much power it uses

Answer

What it produces as an output

Answer

The amount of friction it has

Question 42

Which of these is a benefit of using levers in mechanisms?

Accepted Answer

They allow the direction of the force to be changed

Answer

They always stay in place once moved

Answer

They only work in one direction

Answer

They need a lot of force to work

Question 43

When evaluating how well a mechanism works, what is the most important thing to think about?

Accepted Answer

Can it do what it is supposed to do?

Answer

Is it easy to fix?

Answer

How much does it cost?

Answer

Does it look good?

Question 44

What is the maximum possible efficiency of a mechanism?

Accepted Answer

100%

Answer

50%

Answer

75%

Answer

25%

Question 45

Which of these is a common way to make a mechanism more efficient?

Accepted Answer

Reducing friction

Answer

Adding more gears

Answer

Making the mechanism bigger