cameroon gce A level 2024 engine systems 1
cameroon gce A level 2024 engine systems 1
Engine decarbonisation is the cleaning of
A exhaust carbon from the exhaust
manifold.
B carbon deposits from the crankcase
C carbon deposits on piston crown, valve
seats, valves and cylinder head.
D carbon deposits from the inlet manifold
2. A common rail direct injection diesel engine
misfires on cylinder number 3. This could be
caused by
A an open circuited cylinder N9‘3 glow plug
B a low compression in cylinder N®-3
| C a short circuited cylinder | glow plug. |
| D an incorrect fuel cetane rating |
7. The swept volume in cm1 of an engincTwitha
bore of 110mm and stroke of 140mm is
A 13300000cm3
B 0.00133cm3
C 1330cm3
D 133cm3
8. Two of the three connecting rod bearing loads
that increase as engine speed increase are
A torsional and pressure loads
B pressure and inertia loads
C centrifugal and inertial loads
D pressure and centrifugal loads
3. The formulae used to calculate die speed of die
piston is given by
A rcSN
B 2SN
C 2nSN
D 2ITsn/30 9. Part 12 of figure 2 is mounted in EFI engines to
4. Dampeners are used on some fuel rails to
A increase the pressure in the rail
B reduce ( decrease) the fuel pressure in the
t
I; ;;::0
rail. ? * i. ” * «
– ; o
C reduce noise
D trap dirt and keep it away from the
injectors
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1 J
9
5. A multi–cylinder engine
A has a higher power to weight ratio than
single cylinder engine
B reduces engine output power as engine
speed increases
C lacks proper balance which increases
engine vibration
D is not efficient for use where more torque
is required
Figure 2
A eliminate the reaction of other gases in the
exhaust system
B compare the oxygen content in the exhaust
with that of the outside air
C sense the level of water in the exhaust gas
D sense the level of carbon dioxide in the
exhaust gas
