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
Joints could be damaged.
Air start valves could jam.

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 led to two or three sections of the exhaust gas manifold.
are entering into a spacious exhaust gas manifold.
are driving only one single turbocharger.

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

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

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

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.
Increase the lubrication oil temperature.
Start to purify the oil.
Decrease the lubrication oil temperature.

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

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

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

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

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

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

Review Answers

Engineering, Control Systems. Test 27

Engineering, Control Systems. Test 27

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