Engines App

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Poor engine performance and engine overheating can be caused by

• too rich a petrol-air mixture
• a hole in the exhaust silencer
• a blown cylinder head gasket
• a loose V belt

In a direct injection compression ignition engine the injector

• injects fuel into the ante-chamber
• injects fuel into the combustion chamber
• injects the fuel into the throttle body
• injects fuel into the manifold

If there is a lack of engine power and the exhaust gives off a smelly blue smoke, the likely fault is

• water in the engine oil
• burnt out exhaust valves
• burnt out inlet valves
• broken piston rings

Which of the following is the most likely cause of water in the engine oil

• an inoperative cooling fan
• a blown cylinder head gasket
• multiple broken piston rings
• a defective thermostat

Which of the following is the correct procedure to follow if a petrol fire occurs on a vehicle

• try to extinguish the fire with an air line
• extinguish the flames with a CO2 extinguisher
• quickly drive the vehicle out of the workshop
• quickly try to find your workshop supervisor

Diesel engines re fitted with a speed limiting device to

• reduce particulate emissions
• limit fuel pressure
• control injection timing
• prevent over revving

Broken piston rings are likely to cause

• high oil pressure
• high oil consumption
• low oil pressure
• low fuel consumption

An SI engine has a compression ratio of 9:1. If the engine is in good condition it would have a compression ratio of approximately

• 10.50kPa (1,520 psi)
• 1050 kN/m2 (152 psi)
• 105 kg/cm2 (190 psi)

An engines valve timing is;' Inlet valve lead 11 degrees , Inlet valve lag 59 degrees. Exhaust valve lead 53 degrees, Exhaust valve lag 13 degrees. This means

• The vale overlap is 22 degrees
• the valve overlap is 23 degrees
• the exhaust valve opens for 236 degrees
• the inlet valve opens for 250 degrees