Engineering, Control Systems. Test 28

In diesel engines, cylinder lubrication has the primary function of _____ .

forming a film between liner and rings, acting as a sealing barrier to prevent the escape of combustion gases and reducing friction between parts.
flushing the carbon residue from the piston skirt and wash it down into the scavenge space.
ensuring that cylinder liner and piston are well oiled so that they will not overheat.
cooling the piston which would otherwise overheat and ensure that the carbon between the piston rings is cleared away.

If the output of this auxiliary diesel increases, say by 30 %, how will the thermometer readings on the outlet side of engine and turbocharger change ?

They will remain the same
They will slightly decrease (by 10 to 30 degrees C)
They will greatly increase (by 80 to 100 degrees C)
They will slightly increase (by 20 to 50 degrees C)

An auxiliary diesel Engine cylinder head valve guide is shown. Which are the correct guide dimensions for the nominal sizes shown?

00 : 27.00
11.92 : 27.05 11.81 : 27.04
12.00 : 27.04 11.96 : 26.96
11.65 : 27.21 11.60 : 27.23

In a constant pressure type turbocharger how does the exhaust gas enter the turbo charger?

Via a single, common exhaust gas manifold.
Via two or more exhaust manifold groups.
Via separate individual cylinder exhaust pipes.
A separate manifold for adjacent exhausts.

What is the fundamental difference between a 2-stroke and a 4-stroke engine?

Number of exhaust strokes each combustion cycle
Number of piston strokes each one needs to complete a revolution
Number of piston strokes required to complete a combustion cycle
Number of power strokes each combustion cycle

The water cooling space on the turbocharger is damaged and you have no spares. The cooling water must be closed. What steps would you take to ensure least possible damage?

Remove rotor assembly and fit the sealing plate.
Open turbine drains and tell the duty engineer to pay special attention for abnormalities.
Run the engine at lower speed with the turbine drains open.
Shut off cooling water and run at reduced rpm.

Review Answers