Engine Performance. Test 6 – Online Maritime Tests

This characteristic shows the output pressure of a controller effecting valve lift. If PB = 100 % is the graph shown in 'a' . What is the graph of PB = 50 % ?

Graph e
Graph f
Graph b
Graph d

This is an actual lay-out drawing of a pneumatic amplifier block. Where is the 20 psi supply air admitted ?

At air passage item 14
At air passage item 15
At air passage item 12
At air passage item 13

How is it ensured that the flow of the scavenge air is directed symmetrically through the cylinder ?

By the turbocharger.
By the uniflow system.
By the reverse system.
By the scavenge port shape.

This drawing shows which kind of pneumatic controller ?

A proportional controller.
A proportional integrating controller.
A proportional integrating-differential controller.
A proportional differentiating controller.

A diesel engine cylinder diameter is 700 mm, its stroke is 1200 mm, its IMP is 8.9 bar and its revolutions 120 RPM. What is the POWER developed per cylinder ?

1095 IHP
2344 metric HP
1633 shaft horsepower
2052 BHP

Suppose the variation of INPUT is 1 psi down instead of 1 psi up on this pneumatic P-Controller. If the proportional band PB is 25 % what will be the output pressure ?

3 psi
0 psi
6 psi
2 psi

As we can use only the linear part of the characteristic, this shows that the flapper can only travel 0.01 mm, therefore DELTA psi obtained can only be less than 1 psi. Can we use the flapper nozzle system ?

No, the nozzle/flapper assembly needs modification.
Yes, but the readings obtained between DELTA psi need to be amplified.
No , the flapper system will gives erratic readings.
Yes, but the valves need a servo booster.

What would be the variation of output on this pneumatic controller if Proportional B and PB = infinity, by varying the input as shown here ?

No response, nil
Between 3 and 15 psi
Infinity, full open, full close control system
1 psi

Review Answers