Engineering, Control Systems. Test 27

Why is it so important to maintain air start lines clear of oil?

Increased risk of fire in compressed air
Air start distributor valve could seize
Air start valves could jam.
Joints could be damaged.

What is the final engine test before starting the main engine for departure?

Blow indicator cocks, test reversing of engine, short firing kick.
Open air to engine, drain air bottles, blow indicator cocks
Put out the turning gear and turn the lubricators.
Close safety valves, blow indicator cocks, fill air bottles

What is the main function of the lub oil priming pump on a Diesel engine?

Circulate oil after overhaul.
Stand-by lub oil pressure pump.
Circulate oil system for starting.
Priming lub oil filters after cleaning.

In an 'impulse type' exhaust gas turbocharger, the exhaust gases of the main engine _____

are driving only one single turbocharger.
are entering into a spacious exhaust gas manifold.
are led in pipe groups directly and separately to the turbocharger.
are led to two or three sections of the exhaust gas manifold.

What is referred to as 'masking' of Diesel engine inlet and exhaust valve heads?

Build up of carbon on valve seats.
When the valve seat becomes recessed into the head.
When the valve edge becomes very thin.
Build up of carbon on the valve stems.

You have checked the oil viscosity in an auxiliary engine with the viscosity test kit. The result shows that the viscosity is low. What will you do ?

Clean the system and change the oil.
Decrease the lubrication oil temperature.
Increase the lubrication oil temperature.
Start to purify the oil.

What is the purpose of the starting valve fitted on the cylinder head of a diesel engine ?

To activate the main air starting valve fitted on the engine.
To allow starting air of 25 kg/cm2 into the cylinder when starting.
To allow air from the main air bottle to enter the cylinder directly.
To block the fuel and air supply unless in 'START' position.

Why can the temperature of the scavenge air after the scavenge air cooler not be lowered below a given temperature and why has the temperature to be regulated above this value ?

To maintain the thermal efficiency of the diesel.
To avoid misfiring and starting problems.
To avoid cracking of the cylinder liner.
To avoid condensate and water entering the engine.

Review Answers