Engineering, Control Systems. Test 27

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

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

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

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

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

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 ?

Increase the lubrication oil temperature.
Start to purify the oil.
Decrease the lubrication oil temperature.
Clean the system and change 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 air from the main air bottle to enter the cylinder directly.
To block the fuel and air supply unless in 'START' position.
To allow starting air of 25 kg/cm2 into the cylinder when starting.

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

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

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

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

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

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

Review Answers

Engineering, Control Systems. Test 27

Engineering, Control Systems. Test 27

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