Instructions to Candidate’s
- Write your Name, Index Number, Class and Admission Number in the spaces provided above.
- Answer all the questions in section A in the spaces provided.
- Answer question 11 and any other three questions in section B.
QUESTIONS
SECTION A (40 Marks)
Answer all the questions in this section in the spaces provided.
- State four uses of internal combustion engine. (4 marks)
- State two safety precautions that should be observed when using each of the following tools.
- Hammer (2 marks)
- Spanner (2 marks)
-
- Give two reasons for allowing materials. (2 marks)
- Explain the functions of the following engine components. (2 marks)
- Spark plug
- Recoil starter
-
- Draw the following types of bearings.
- Flanged blind bearing. (1 mark)
- Plain bush (1 mark)
- Differentiate between a gasket and a seal in terms of their uses. (2 marks)
- Draw the following types of bearings.
- The table below shows components that are found in an engine cam shaft. State the function of each. (4 marks)
-
- Differentiate between a lean mixture and a rich mixture. (2 marks)
Component
Function
Cam lobes
Eccentric cam
Spiral gear
Bearing journals
- Explain the following types of an engine. (3 marks)
- Over square
- Under square
- Square
- Differentiate between a lean mixture and a rich mixture. (2 marks)
- List four causes of oil contamination in an engine. (4 marks)
- The following is a component found in an engine
- Name the component:(1 mark)
- State in which system it is found:1 mark)
- Name that parts labelled A and B;
A ___________________________ (1 mark)
B___________________________ (1 mark)
-
- Explain two reasons why an alternator is preferred to a d.c generator. (2 marks)
- Name the component of an labeled B below. (1 mark)
- State the use of the part labeled A. (1 mark)
- Sketch, in 1st Angle orthographic projection, the F.E. and E.E. of the shaped block shown. (3 marks)
SECTION B: (60 MARKS)
Answer question 11 and any other three questions from this section.
- The figure below shows components drawn in fist angle orthographic projection. On A3 paper provided draw full scale the isometric view of the object. (15 marks)
-
- State two functions of a soldering flux. (2 marks)
- State three properties of a good soldering flux. (3 marks)
- Explain the difference between welding and soldering. (2 marks)
- Study the diagram below.
- Name the parts labeled. (5 marks)
A______________________
C_______________________
D_______________________
G_______________________
H_______________________ - Explain the function of the following parts. (3 marks)
B_______________________
E_______________________
F_______________________
- Name the parts labeled. (5 marks)
- The diagram below shows a diesel fuel system with parts labeled A to F.
- State the name and function of the parts and fill your and the table below;(10 marks)
COMPONENT
NAME
FUNCTION
B
C
D
E
F
- State two functions of a fuel tank cap. (2 marks)
- List three types of diesel fuel filters. (3 marks)
- State the name and function of the parts and fill your and the table below;(10 marks)
-
- Draw a neat diagram of a dry plate clutch assembly and label at least four parts.(6 marks)
- Explain how the above assembly functions;
- During engagement (3 marks) _____________________
- During disengagement (3 marks) ______________________
- Explain the effect of the following in a clutch assembly. (3 marks)
- Presence of oil on the friction plate
- Weak thrust spring
- No cushion springs on the clutch plate
- The size of a four cylinder combustion engine is given by;
- Bore 90mm
- Stroke 90mm
- Clearance volume 71.6cc
Determine the following;- The engine capacity to the nearest cc. (5 marks)
- Compression ratio to one decimal place. (4 marks)
- Explain if the engine is spark ignition or compression ignition engine.(2 marks)
- Explain the following terms as used in engine description. (4 marks)
- Model
- Make
- Capacity
- Serial number
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