Instrumentation. Test 5 – Online Maritime Tests

U-tube manometers are often used to measure differential pressure. Which of the listed pressures is U-tube manometers mostly used for?

High differential pressures
Cargo pressure
Low differential pressures
Absolute zero pressure

Which component does this graphical symbol illustrate?

PH analyzer
Pressure indicator, installed on panel/console
Pressure relief valve, self-contained
Pressure indicator, installed locally

Two reference points for pressure exist, absolute zero and atmospheric pressure. What do you call pressures measured relative to absolute zero?

Gauge pressure
Absolute pressure
Vacuum pressure
Pressure drop

Liquid flow through pipe lines is often measured by means of differential pressure across a restriction (orifice) in the pipe as illustrated by this figure. Which of the listed formulas will you utilize for calculating the volumetric flow F?

Formula 1
Formula 2
Formula 3
Formula 4

This circuit symbol is an amplifier system and its frequency response diagram. Which control function is the system performing?

Proportional + integral + derivate (PID)
Integral (I)
Proportional + derivate (PD)
Proportional + integral (PI)

When calibrating an pressure transducer we have to adjust both SPAN and ZERO. Please indicate in which order these adjustments should be done.

First Zero adjustment and the Span adjustment. Then Zero should be rechecked.
First Span adjustment and then Zero adjustment. After that Span setting should be checked gain.
First Span adjustment and then Zero adjustment. After that Span setting should be checked again.
The order of adjustment is of no importance.

Two reference points for pressure exist, absolute zero and atmospheric pressure. What do you call pressures measured relative to atmospheric pressure?

Atmospheric pressure
Absolute pressure
Gauge pressure
Pressure drop

What is an A/D and a D/A converter?

A converter that converts an analogue signal to a digital signal and vice versa.
A converter that converts alternating current into direct current and vice versa.
A converter stabilising the voltage.
An amplifier for direct current.

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