cameroon gce A level diesel engine technology 1

cameroon gce A level diesel engine technology 1

cameroon gce A level diesel engine technology 1

1. What will be the consequence of a too small valve clearance?
A Valve opening lag
B Valve expansion
C Valve clearance
D Valve deformation.
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2. What is the role of the cylinder head gasket?
A To ensure the sealing between the cylinder head and the cylinders block
B To protect the pistons
C To constitute the combustion chamber
D To ensure the oil and drainage duct.
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3. Which ring ensures the sealing and avoids oil consumption?
A Fire segment
B Burning ring
C Scraper ring
D Intermediary or seal ring
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4. How do we lubricate cylinder liners?
A With a pump
B With a special element
C By projecting oil on the liners
D Oil will come from the combustion chamber.
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5. What does “SAE” means?
A Safe the Automotive Engineers
B Society of Automotive Engineering
C Society of All Engineers
D Safety for All Engines
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6. With the cold start, the engine needs a:
A Richer mixture
B Leaner mixture
C Chemically equal mixture
D Weaker mixture
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7. Maximum torque is generated by an engine when:
A It runs at lowest speed
B It develops maximum power
C It consumes maximum fuel
D It runs at maximum speed
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8. The Diesel mixture cycle is the combination of two cycles in which
A All the combustible gas burns at constant volume and a part at constant pressure
B One part of combustible gas burns at constant volume and another at constant pressure
C All the combustible gas burns at constant volume and constant pressure
D All the combustible gas burns at constant pressure and at constant pressure.
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9. The compression ratio of the diesel engines is always higher than that of the petrol engines? Because of:
A Big dimensions of the diesel engines parts
B The fuel used
C Self ignition
D The shape of the combustion chambers
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10. At what phase of operation should we bleed a diesel engine?
A When engine is at idle speed
B When engine is at rest
C When engine is at high speed
D When engine is in full load
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11. A common rail direct injection (C.D.I) diesel
engine has an active diagnostic trouble code
for single cylinder No 3 misfires. This could be
caused by:
A A low compression in cylinder No 3
B An open circuited No3 cylinder glow plug
C A short circuited No 3 cylinder glow plug
D Incorrect fuel cetane rating
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12. This exhaust emission is not produced by a diesel engine.
A CO
B HC
C NOX
D SiH4
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13. In an electronic diesel injection system, which element determines the flow and the beginning of injection?
A The fuel pump
B The electronic control unit
C The high pressure pump
D Injectors
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14. The function of a diesel injector is to:
A Mix the fuel and air
B Ignite the air – fuel injector mixture
C Provide flame front for ignition
D Spray atomized fuel in the cylinder
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15. The time of injection is the very short time which passes between the fuel exit from the:
A Fuel tank at the entry of the fuel pump
B Fuel pump at the entry of the injection pump
C Injection pump exit and the beginning of injection in the cylinder
D Injection pump at the entry of the injectors
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