Engineering, Control Systems. Test 32

What is the mechanism that moves the injection needle upwards in the injector and causes the injector to spray fuel under pressure into the cylinder ?

The mechanical force of the fuel cam.
The balance pressure obtained by the injector spring.
The hydraulic pressure in the fuel line.
The lifting pressure of the pump plunger.

What determines delivery pressure on a Bosch type fuel pump?

The fuel cam profile.
The spring setting on the fuel injector.
The length of stroke of the fuel pump.
The position of the fuel pump control rack.

A clogged or dirty lubrication oil filter can best be detected by _____ .

visual inspection of the filter elements.
high lube oil temperature.
a decrease in oil viscosity.
the pressure drop across the filter.

Why should anti- friction greases not be used on cylinder head nuts?

Allows them to loosen in use.
Increases the actual pressure exerted at the set torque reading.
Contaminates the engine lub oil.
Enables them to be over tightened.

What do you consider to be the most important task on completion of maintenance work on the piston?

Starting the auxiliary blower to ventilate the scavenging belt, the cylinder liners, to ensure that the engine has sufficient fresh air to start.
Starting the engine to see that it rotates.
A search inside the crankcase for tools and rags.
Patching up destroyed paintwork on the crankcase doors.

How is the air-tightness of the sliding piston (moved by control air pressure and spring) ensured in starting air valves of this type ?

Teflon seals are fitted.
Labyrinth seals are fitted.
Piston rings are fitted.
O-ring seals are fitted.

Review Answers

Engineering, Control Systems. Test 32

Engineering, Control Systems. Test 32

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