Engine Performance. Test 5

If the measured value bellow is connected to the output of the jacket CW temperature transmitter and the Pu of the controller is 9 psi, and we reduce the temperature setting from 75 to 72 degree C what happens to the Pu ?

It will decrease below 9 psi.
It will increase to 20 psi.
It will decrease to 0 psi.
It will increase above 9 psi.

Since the output of the pressure transmitter is not linear with the flow in the pipe as measured over the measuring flange the output signal should be sent to a _____

balancing valve.
equaliser.
root extractor.
summator.

The use of a steam trap has a beneficial influence on the thermal balance of the heat exchanger fitted before that trap. This is because _____

all heat is used under corresponding saturated pressure.
it will allow the steam to expand to atmospheric pressure.
all heat will be extracted from the steam before turning to water.
it will allow the steam to expand below atmosphere to vacuum.

Suppose the INPUT of the pneumatic controller is 4 psi and the PB is 25 %. If variation on the input is 1psi down, what is the variation on the output expressed in psi ?

4 psi
2 psi
6 psi
1 psi

Whatwill happen if the charge air pressure drops?

The cylinder cooling water flow becomes too high.
The turbochargers cooling water flow becomes to high.
The performance of the engine is nearly the same.
The performance of the engine is reduced noticeably

Graph 'd' of this characteristic showing output pressure Pu of a controller effecting valve lift, represents ZERO proportional band over INFINITIVE amplification. How does the system works ?

It works FULL OPEN/FULL CLOSE, unsteady, offset NIL.
It works with intolerable offsets.
It works with maximum range offsets.
It does not regulate the level at all.

This characteristic shows output pressure of a controller effecting valve lift. If PB = 100 % is the graph shown in 'a ' . What is the amplification factor and the proportional band represented by graph 'f' ?

Amplification 0, Proportional Band infinitive
Amplification 50 %, Proportional Band 100 %
Amplification infinitive, Proportional band 0
Proportional band 50 %, amplification 100 %

If the input flow Q1 increases to Q1' and level L increases to L' what will initially happen ?

The output pressure Pu will increase proportionally to L'
The amplification factor K will change
The proportional band PB will change
The amplifier will increase its air output pressurising bellow P

If Q1 is the filling volume of the tank and Q2 the outflow volume of the tank and the level L is constant by controller output pressure Pu = 9 psi, the valve V2 will be open for _____

50 %
100 %
75 %
25 %

Review Answers

Engine Performance. Test 5

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