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Design and Technology

Systems and control

Mechanisms - Test

1.

Which of these are levers used for?

2.

What class of lever is a wheelbarrow?

3.

How is the velocity ratio of a lever calculated?

4.

A load of 600N is moved by an effort of 200N. What is the mechanical advantage?

5.

Linkages can be used to change:

6.

A bicycle breaking system is an example of a reverse-motion linkage: true or false?

7.

Windscreen wipers are an example of a treadle linkage: true or false?

8.

A cam mechanism has three basic parts: cam, slide and follower: true or false?

9.

What type of cam is required to make the follower dwell for half the cycle, then rise and fall smoothly?

10.

A number of gears connected together are called a what?

11.

The input, perhaps a motor, is connected to the what?

12.

What type of gears change the direction of rotary motion by 90 degrees?

13.

A pulley system has two pulley wheels. The driven wheel is 90mm wide and the driver wheel is 30mm wide. What is the velocity ratio?

14.

What type of motion is a pendulum in a clock?

15.

Which of the mechanisms listed below would be used to change linear motion to rotary motion, or rotary to linear?

16.

An open driving belt will cause two pulleys to turn in the same direction. What effect will a crossed driving belt have on two pulleys?