Engineering, Control Systems. Test 32

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

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

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

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

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

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

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

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

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

What determines delivery pressure on a Bosch type fuel pump?

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

Review Answers

Engineering, Control Systems. Test 32

Engineering, Control Systems. Test 32

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