Instructions
- Answer ALL the questions
- All the answers and working must be written on the question paper in the spaces provided below each question or in A3 paper provided.
- Label every work drawn on A3 paper provided
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QUESTIONS
DESIGN PROBLEM (40 marks)
People working in an office in various institution often desire that their doors remain closed when they are inside. This posses a challenge to them whenever a visitor gets in and forgets to lock the door when the leave. Design an automatic door closing system considering the following:
- It has bars that are fixed on the door board and frame.
- It controls the speed at which it closes the door.
- It is strong enough to withstand the force applied on it.
- It is assembled on the door using screws.
Requirements- Make sketches of two possible solutions for your design (6 marks)
- Select one of the designs in (a) above and make a refined labelled pictorial sketch (14 marks)
- Make detailed sketches for the mechanisms to allow for each of the considerations above (15 marks)
- List three materials used and state one reason for the choice of each. (3 marks)
- State two methods of joining the parts and state where each is used (2 marks)
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MARKING SCHEME
DESIGN PROBLEM (40 marks)
People working in an office in various institution often desire that their doors remain closed when they are inside. This posses a challenge to them whenever a visitor gets in and forgets to lock the door when the leave. Design an automatic door closing system considering the following:
- It has bars that are fixed on the door board and frame.
- It controls the speed at which it closes the door.
- It is strong enough to withstand the force applied on it.
- It is assembled on the door using screws.
Requirements- Make sketches of two possible solutions for your design (6 marks)
Functionality-1 Functionality-1
Stability-1 Stability-1
Pictorial-1 Pictorial- 1 - Select one of the designs in (a) above and make a refined labelled pictorial sketch (14 marks)
Labeling-2
Pictorial-2
Stability-2
Finctionality-3
Frame bars-3
Provision of joining method by use of screws- 2 - Make detailed sketches for the mechanisms to allow for each of the considerations above (15 marks)
Frame bars- 3
Closing and opening position of the device- 5
Metal bar made of strong material- 1
Securing using screws- 2
Device that enhance automatic closing- 4 - List three materials used and state one reason for the choice of each. (3 marks)
Steel- to make strong arms √ 1
Iron- for screws because it can easily be threaded√ 1
Rubber- used a washer in conjunction with bolts and nuts√ 1 - State two methods of joining the parts and state where each is used (2 marks)
Use of bolt and nut- to join the arms√ 1
Screws- to secure frame bars on frames√ 1
- Make sketches of two possible solutions for your design (6 marks)
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