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Auto Mechanics Paper 2,Nov/Dec 2008.  
Questions:   1 2 3 4 5   Main
General Comments
Weakness/Remedies
Strength















Question 3

(a) Name in sequential order, the four cycles of a petrol engine.

(b) With the aid of a sketch, describe the first stroke.

(c) State two differences between the four stroke compression ignition cycle and the four stroke spark

        ignition cycle.

_____________________________________________________________________________________________________
OBSERVATION

Most of the candidates attempted this question and gave the required response correctly.  However Part (c) of the question was not correctly responded to by the candidates.  The correct response to Part (c) is given in tabular form below.

Operational Sequence

C.I Cycle

S.I. Cycle

i

Induction

Air only

Air/fuel mixture

ii.

Compression

High compression ratio

Low compression ratio

iii

Power

Self ignition

Spark plug ignites the charge

iv

Exhaust

Less poisonous

Highly poisonous

 

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