Engineering, Control Systems. Test 25

A piston of this type is composed of the following main parts:-

piston, piston rings, telescopic piping.
piston crown, piston body, piston rings.
piston body, piston flange, piston crown.
piston crown, piston rod, piston skirt, intermediate piece.

What would you call the assembly fitted on the piston rod, which fits into a flange on top of the crankcase block opening through which the piston rod moves in order to secure tightness ?

The piston rod stuffing box.
The scavenging air valve box.
The crankcase sealing assembly.
The piston underside valves.

For a turbo charger is running at full speed, what would be a usual oil sump temperature on the turbine side ?

45 to 50 degrees C
55 to 65 degrees C
72 to 82 degrees C
35 to 45 degrees C

A Main Engine revolution counter reads 69,980 at 0800; at noon the counter reads 90,932, if the clocks are advanced 20 mins. during the watch what was the average rpm during the 8-12 watch?

115.6 rpm
98.4 rpm
87.3 rpm
77.2 rpm

What would result from high charge air temperatures?

Jacket water temperature would rise.
Cylinder head relief valves would lift.
All exhaust temperatures would rise.
Charge pressure would increase.

What is the best way of preventing scavenge fires in a slow speed two stroke diesel?

Maintain correct cylinder lubrication.
Ensure fuel injectors are maintained.
Keep scavenge spaces clean.
Burn only the specified grade of fuel.

In a 4 cycle engine the inlet valve begins to open when the piston is _____

just before TDC on the exhaust stroke.
just before BDC on the suction stroke.
at BDC on the firing stroke.
after TDC on the suction stroke.

At what moment will the cylinder head starting air valve, shown here, open and allow 25 bar to flow into the cylinder ?

When control air is supplied to the top connection.
When the main starting air is opened from the bottle.
When the control air on top is vented by the starting cam.
When 25 kg/cm2 air is supplied on top by manoeuvring.

Review Answers