Wednesday, March 26, 2014

Bite Size Question 17

Electronics:

1. A thyristor is normally used in an alarm system.

Describe, with the aid of sketches, how a thyristor is used in an alarm system. [4]

Bite Size Question 16

Electronics:

1. There are different types of sensors used in electronic circuits.

a) The Light Dependent Resistor (LDR) is a type of sensor. Describe how this sensor works. [2]

b) Another type of sensor is affected by heat. Name and sketch this electronic component. [2]

Bite Size Question 15

Electronics:

1. Switches are used to make or break an electronic circuit.

a) Name two different types of switches.

b) A transistor is also known as an 'automatic switch'. Explain, with sketches and annotations, how a transistor works.




Thursday, March 20, 2014

littleBits

'LittleBits is like Lego for the Ipad generation'. See the link below to know more about littleBits and what they can do.

http://littlebits.cc/about

Sunday, March 16, 2014

Bite Size Question 14

Mechanisms:

One type of motion in mechanisms is linear motion, which is defined by motion in a straight line.

a) Identify and sketch out the other 3 types of motion. [6]

Bite Size Question 13

Mechanisms:

The figure below shows a wheelbarrow.

Source: http://sweetclipart.com/wheelbarrow-line-art-1107

a) Identify the class of lever used in the figure above. [1]

b) Sketch out the wheelbarrow and mark the positions of the load (L), fulcrum (F) and effort (E) clearly using arrows. [4]

Bite Size Question 12

Mechanisms:

1. A spur gear system is one of the gear systems used in machines.

a) Identify and sketch out another 2 types of gear mechanisms. [4]


Bite Size Question 11

Structures:

1. Structures can be be made more rigid and firm using reinforcements.

a) Identify and sketch out 2 types of reinforcement used in structures. [4]

Bite Size Question 10

Structures:

1. The figure below shows a man on a diving board.


Source: http://vecto.rs/1024/vector-of-a-cartoon-man-hugging-a-diving-board-outlined-coloring-page-by-ron-leishman-19352.jpg

a) Redraw the diagram and mark the position of the forces acting on the diving board. [3]

b) Name the force/s experienced by the diving board. [3]

Bite Size Question 9

Structures:

1. Structures can be categorised as frame and shell structures.

a) Explain the difference between a frame and a shell structure. [2]

b) Name an example of each type of structure. [2]


Bite Size Question 8

The figure below shows two type of drawings.


Source: http://www.flickr.com/photos/93090508@N07/8461937487/

a) Name the type of drawings shown above. [2]

b) Explain the purpose of the drawings used. [2]

Bite Size Question 7

1. The figure below shows a type of drawing.


Source: http://www.nomenclaturo.com/tag/acoustic-guitar

a) Name the type of drawing shown in the figure above. [1]

b) Explain why this type of drawing is used. [2]

Thursday, March 13, 2014

Bite Size Question 6

1. It is important to select the best idea for development after ideation.

a) Give 2 advantages of PMI as compared to SWOT in selecting the best idea for development. [2]

b) Describe any 2 aspects of development in the design process. [4]