Main Propulsion, Turbines, Boilers. Test 2

We have two kinds of turbocharging systems: constant pressure and impulse. The difference between these two can be found in:

The blades on the exhaust gas turbine
The scavenging valves of the engine.
The exhaust gas receiver
Scavenging air coolers

How is the quantity of fuel oil, in HP fuel oil pump adjusted when the engine is running ?

By adjustment of the pressure valve in the pump.
Adjusting oil flow to the HP fuel oil pump.
By adjusting the length of the pump stroke.
Turning the plunger piston according to engine load.

During inspection of the crank bearing for one of the units in the main engine, the bearing shell was found as follows: Surface of the white metal was black and very hard. Patches of black incrustations have worn grooves in the journal. What was the cause?

Wrong casting of bearing shell
Water in the lubricating oil during service
Bearing shell service time exceeded.
Dirt in the lubricating oil

What is the purpose of the cylinder head safety valve?

To adjust the cylinder pressure to a safe working pressure
To relieve excessive high pressure in the cylinder to protect the engine from being damaged
For indication of engine being overloaded.
A valve for safety stop (emergency) of the engine

The engine is started by compressed air. Which one of the following statements is correct ?

If we have lost the starting air pressure, we can use a pressurized oxygen bottle from the welding equipment for an emergency start of the engine.
If the engine does not turn when we open for the starting air, we can use the turning bar together with the starting air to get the engine out of a deadlock position.
The starting air shall always contain some water.
A heavily leaking starting air valve can cause an explosion in the starting air pipe system.

We have two kinds of turbocharging systems: constant pressure and impulse. The difference between these two can be found in:

Scavenging air coolers.
The scavenging valves of the engine.
The exhaust gas receiver.
The blades on the exhaust gas turbine.

When a changeover from HFO to diesel oil is going to take place, we want this to be carried out as follows:

as fast as possible to save HFO.
as quick as possible, to obtain a fast temperature reduction to cool the HP fuelpumps.
as fast as possible to save steam.
slow to get slow cooling.

We have a problem with surging in the turbocharger. Which of the following could be the cause?

Dirty rotor blades.
Worn out bearings on the turbocharger.
Dirty scavenging air cooler on the air side.
The lubrication oil pump is malfunctioning.

The lubricating oil on the exhaust side of the turbine blower gets very dirty after only a few hours in service. What can the reason be?

Worn out bearing turbine side.
Exhaust gas leaking into the oil chamber.
Wrong type of oil used.
Lubricating oil is mixed with salt water.

During inspection and calibration of one unit, you observe the situation shown. The conclusion is clover leafing. The main engine uses high grade TBN cylinder oil. What do you have to do in order to reduce wear?

Decrease jacket cooling water temperature to avoid heat stress
Increase cylinder oil consumption to neutralize the sulfur
Contact engine maker for advice.
Increase the jacket cooling water temperature to avoid the sulfur dew point

Review Answers