Instrumentation. Test 7 – Online Maritime Tests

In a fresh water tank we are using a pressure transmitter with a range of 0-0.5 bar / 4-20mA for level measurement. The transmitter is for different reasons installed 30 centimeters from the bottom of the tank, and the tank is 5 meters high. What will the output from the transmitter be when the tank is full? (Pending no calibration is made)

21,2 mA.
30 mA
18,8 mA.
20 mA.

What is the definition of DEAD BAND?

A missing electrical signal.
The change needed in the input signal to produce a change in the output signal.
The largest difference in the output signal for the same change in the input signal.
The change in the output signal produced by a certain change in the input signal.

In a fresh water tank with a height of 5 meters we shall use a pressure transmitter for level measurement. The tank has a vent-pipe leading to deck 8 meters above the top of the tank. What pressure shall we use as a guidance when ordering the pressure transducer?

0,8 Bar.
0,5 Bar.
1,3 Bar.
2,0 Bar.

This is an electronic temperature controller. You have been asked to adjust the controllers integrating action. Which button on the front of the controller shall be utilized for this adjustment?

Pos. 6
Pos. 2
Pos. 8
Pos. 7

What is the purpose of the Oil Mist Detector?

To detect the circulating oil
To avoid stuffing box leakages
To detect oil mist (explosive atmosphere in the crankcase).
To avoid hot spots in crankcase

Temperature sensors of all types are normally mounted in a well, or pocket, when used in pipelines. Why?

Avoid electric current flowing from the sensor to the liquid.
Suppress electro-magnetic interference between liquid in the pipe and the sensor.
Decrease the temperature gradient between the liquid and the sensor.
Allow removal of the sensor also when liquid is flowing in the pipe.

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