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S&rmvec T2 March

The document discusses servicing and repairing vehicle engine components. It provides definitions for internal combustion engine, cylinder bore and swept volume. It also describes overhead valve arrangement, advantages of multi-cylinder engines, functions of the cooling system and effects of engine overheating and undercooling. The document differentiates between valve seat and valve face and states causes of engine overheating.

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waudogodfrey47
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36 views3 pages

S&rmvec T2 March

The document discusses servicing and repairing vehicle engine components. It provides definitions for internal combustion engine, cylinder bore and swept volume. It also describes overhead valve arrangement, advantages of multi-cylinder engines, functions of the cooling system and effects of engine overheating and undercooling. The document differentiates between valve seat and valve face and states causes of engine overheating.

Uploaded by

waudogodfrey47
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOC, PDF, TXT or read online on Scribd
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071605T4

AUTOMOTIVE TECHNICIAN LEVEL 6


ENG/CU/AUT/CR/2/6/A
Page | 1
SERVICE AND REPAIR VEHICLE ENGINE COMPONENTS
DAE 023S

RIFT VALLEY TECHNICAL TRAINING INSTITUTE


P.O BOX 244 – 30100
ELDORET
MECHANICAL AND AUTOMOTIVE ENGINEERING DEPARTMENT
WRITTEN FORMATIVE ASSESSMENT TOOL
MARCH 2024 SERIES
TIME: 3 HOURS
INSTRUCTIONS TO CANDIDATES

 This paper consists of TWO sections A and B


 Answer ALL the questions in section A and three questions in section B
 Marks for each question are indicated in the brackets
 Do not write on this question paper
NAME………………………………………………………………..

ADMISSION NO…………………………………………………….

CLASS………………………………………………………………….

1
SECTION A (40MARKS)

ANSWER ALL THE QUESTIONS FROM THIS SECTION 1

1. Define the following terms:


Page | 2
(a) Internal combustion engine

(b) Cylinder bore

(c) Swept volume. (6 marks)

2. State TWO functions of the piston. (2 marks)

3. Differentiate between valve seat and valve face. (2 marks)

4.With the aid of a well labeled diagram describe an overhead valve arrangement. (6 marks)

5. Highlight THREE advantages of a multi cylinder engine over a single cylinder engine. (3 marks)

6. Outline THREE functions of the cooling system in a vehicle (3 marks)

7. State TWO:

(I) effects of engine overheating

(ii) effects of engine under cooling. (4 marks)

8.Using a well labeled diagram , explain the construction of a hemispherical combustion

chamber used on a spark ignition engine. (6 marks)

9.With the aid of a well labeled diagram differentiate between valve seat and valve face

(6 marks)

10. State FOUR probable causes of overheating in an internal combustion engine. (2 mark

2
SECTION B (60MARKS)

ANSWER THREE QUESTIONS FROM THIS SECTION

11. (a) Describe the procedure of dismantling an engine cylinder head (10mks)
Page | 3
(b) Describe the procedure of grinding valve seats (10mks)

12.(a) State TWO advantages of air-cooled engine as compared to water-cooled engine.


(3 marks)

(b) Explain the function of a thermostat in a motor vehicle engine cooling system

(5 marks )

(C) With the aid of a well labeled diagram explain the operation of a wax pellet

thermostat. (12 marks)

13. (a) State TWO advantages of diesel engines. (4 marks)

(b) With the aid of a well labeled diagram explain the operation of an inline

fuel injection pump. (16 marks)

14. (a) Explain THREE operational differences between a spark ignition engine and a

compression ignition engine (6 marks)

(b) Discuss the merits and demerits of a single cylinder engine. (14 marks)

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