Engine Performance. Test 9 – Online Maritime Tests

Why is this connecting rod eye split obliquely?

To decrease the bottom end bolt shock loading.
To avoid setting up unecessary stress in the rod eye.
To allow the piston/connecting rod to pass through the liner.
To allow access to both of the bolts and bearing from one side of the engine.

What is the function of valve V in relation to the outlet pressure Pu of this pneumatic amplifier

To allow venting of pressure Pu to the atmosphere
To allow stabilising feedback pressure on the membrane
To push spring S open via the ball B
To transmit the pressure Pu to the membrane

What is the purpose of part number 2 ?

To reduce the bowl speed to adapt to the type of liquid.
To prevent clean liquid mixing with the in-coming dirty liquid.
To keep the liquid separated.
To accelerate the liquid to the same speed as the bowl.

The basic type of reversing air starting system that can be used only on two-stroke, ported, direct coupled, propulsion Diesel engines is the _____

reversing latch.
distributor type.
rotating camshaft.
sliding camshaft.

From this drawing of a pneumatic pressure transmitter, what is the Proportional Band setting ?

Proportional Band more than 100 %, amplification K less than 1
Proportional Band 0%, amplification infinitive
Proportional Band less than 100 %, amplification K more than 1
Proportional Band = 100 %, amplification K = 1

The flow through this heat exchanger is determined by the 'Reynolds number'. Depending on certain factors, this allows the system designer to select either _____

streamline flow or contra flow.
turbulent flow or laminar flow.
parallel flow or contra flow.
parallel flow or turbulent flow.

To find the indicated power developed in the cylinder the indicator card is used to determine the _____

mean height of the diagram.
mean effective pressure.
firing pressure.
compression pressure.

Which of the following is a record of the pressure existing in the cylinder at various positions of the piston throughout the engine cycle ?

a Cycle diagram.
A Timing diagram.
An Indicator diagram.
A Temperature diagram.

What method is employed in the design of waste heat boilers to obtain maximum heat transfer while maintaining low overall weight ?

Steel fins are installed on the generating tubes to increase the effective surface area.
Feedwater is preheated in a separately fired economizer.
An unfired exhaust gas preheater is added to increase the heat transfer rate.
An external superheated unit is located above the boiler to the gas passages.

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