Ramsay Test Process Flow and Instrumentation 5

Question 1

A magnetic flowmeter (magmeter) can only measure the flow of fluids that are:

Accepted Answer

Electrically conductive, like water

Answer

A magmeter relies on Faraday's law and requires an electrically conductive fluid to generate a measurable voltage.

Question 2

In a feedforward control strategy, the controller acts based on:

Accepted Answer

A measured disturbance before it affects the controlled variable

Answer

Feedforward control measures a disturbance and corrects for it before it changes the process variable.

Question 3

Two block valves with a vent valve between them, used to positively isolate a line, is called a:

Accepted Answer

Double block and bleed

Answer

A double block and bleed uses two isolation valves with a bleed/vent between them for positive isolation.

Question 4

A pressure gauge reading 'gauge pressure' (psig) shows pressure relative to:

Accepted Answer

Atmospheric pressure

Answer

Gauge pressure is measured relative to local atmospheric pressure, reading zero at atmosphere.

Question 5

On a P&ID, the letters 'LSH' identify a:

Accepted Answer

Level switch, high

Answer

In ISA tagging, L=Level, S=Switch, H=High, so LSH is a level switch that trips on high level.

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