Instrumentation True and False Flashcards
A common method of installing a flange gasket is to first install only half of the bolts (in the holes lower than the centerline of the pipe), drop the gasket between the flanges, insert the remaining bolts, then proceed to tighten all bolts to the proper torque.
true
On instrument diagrams, flanges are denoted by two short parallel lines, both perpendicular to the pipe.
true
Safety is affected by improper connections between instruments and the process, but not from instrument to instrument.
false
Ring-type joints (RTJ) are typically found on high-pressure applications where leakage control is more challenging.
true
Tube fittings designed to connect one tube to another are called connectors.
false
A certain level of uncertainty is perfectly acceptable for a process flow diagram (PFD), because its purpose is merely to show the general flow of the process itself, and only a bare minimum of control instrumentation.
true
Function diagrams are used to document the strategy of a control system.
true
To examine details, including cable types, wire numbers, terminal blocks, junction boxes, instrument calibration ranges, failure modes, power sources, and the like, in the instrumentation process, one must turn to a document called a process and instrument diagram (P&ID).
false
When troubleshooting a complex control system, an instrument technician must use only one diagram that shows all details.
false
Gaskets are manufactured from materials harder than the flange material so that when sandwiched between a pair of flanges, the gasket will not get “crushed” between them to seal all potential leak paths.
false
The number of studs holding each flange set together gives some indication of the pressure of the fluid within a pipe.
true
An open circle instrument “bubble” indicates Field-mounted.
true
A ring of metal, usually welded to the end of a pipe, with holes drilled in it parallel to the pipe centerline to accept several bolts is called a gasket.
false
A busway is also sometimes known as a bus duct.
true
The type of “bubble” used for each instrument tells us something about its material type.
false
In the interest of safety and longevity, one can simply route electrical power and signal cables randomly between different locations.
false
The first step in instrumentation is measurement.
true
The only difference between a branch tee and a run tee is the orientation of the pipe end with regard to the two tube ends.
true
The final control device in instrumentation can take a form of a control valve.
true
In instrumentation, once the quantity of interest is measured, a signal representing the quantity is transmitted to an indicating or computing device where either human or automated action then takes place.
true
Bulkhead fittings are designed to fit through holes drilled in panels or enclosures to provide a way for a fluid line to pass through the wall of the panel or enclosure.
true
By far the most common type of tube fitting for instrument impulse lines is the compression-style fitting, which uses a compressible ferrule to perform the task of sealing fluid pressure.
true
Instruments bearing a common “loop number” in the instrumentation process indicate they are all part of the same control system.
true
A traditional and rugged technique for cable routing is conduit.
true
The Swagelok-brand provides a special gauge that has the ability to reveal an overtightened fitting, but not an under-tightened fitting.
false
A reducing union tube joins together different tube sizes rather than tubes of the same size.
true
All instruments connect to their respective processes and to each other by means of pipe, tube, and/or wires.
true
If possible, a goal in tube bending is to eliminate as many connections as possible because connections invite leaks, and leaks are problematic.
true
Regardless of the brand, compression-style instrument tube fittings are incredibly strong and versatile.
true
Plastic conduits are superior to metal conduits with regard to providing electrical grounding or shielding.
false
The common home thermostat is an example of a measurement and control system, with the home’s internal air temperature being the “process” under control.
true
Plastic is a common pipe material for many industrial applications, including instrumentation.
true
In instrumentation, each and every instrument has an input and an output, and there is always a predictable (and testable) correlation from one to the other, which help when diagnosing where a problem lies within a measurement or control system.
true
In order to safely and efficiently produce a continuous flow of steam, in instrumentation involving steam boiler, one must ensure the steam drum is entirely full of water.
false
An obvious advantage of using DIN rail to secure electrical components versus individually attaching those components to a subpanel with their own sets of screws is convenience: much less labor is required to mount and unmount a DIN rail-attached component than a component attached with its own set of dedicated screws.
true
Tubing elbows are tube connectors with a bend that are useful for making turns in tube runs without having to bend the tubing itself.
true
Swagelok gauges are referred to in the industry as no-go gap gauges because their inability to fit between the nut and body shoulder of a tube fitting indicates a properly-tightened fitting.
true
Instrumentation is the science of automated measurement and control.
true
Union tees join three tube ends.
true
Flanges differ with regard to their color and thermal conductivity.
false
The proper form of diagram for the lowest level of instrumentation with fine details is called a process flow diagram.
false
The narrowing of scope with the progression from process flow diagram (PFD) to loop diagram may be visualized as a process of “zooming in” as though one were viewing a process through the lens of a microscope at different powers.
true
An industry-standard structure for attaching terminal blocks and small electrical components to flat metal panels is called a DIN rail.
true
No special procedures are required to “re-make” a disassembled instrument fitting connection: merely tighten the nut “snug” to maintain adequate force holding the ferrule to the fitting body, but not so tight that the ferrule compresses further around the tube than it did during initial assembly.
true
An “up” arrow (↑), in instrumentation, represents a reverse-acting instrument: one whose output signal decreases as the input stimulus increases.
false
In the United States of America, most large industrial pipes are joined together by flanges.
true
A piece designed to seal off the open end of a tube fitting is called a cap, while a piece designed to seal off the end of an open tube is called a plug.
false
Conduit resembles piping used to convey fluids, except that it is much thinner-walled than fluid pipe and is not rated to withstand internal pressure as pipe is.
true
Over-tightening of a compression fitting is not as bad as under-tightening, as the fitting can form a robust seal even when the ferrule and tube have been deformed.
false
At the highest level, the instrument technician is interested in the interconnections of individual instruments, including all the wire numbers, terminal numbers, cable types, instrument calibration ranges, etc.
false
Raised-face (RF) flanges are designed to seal against a gasket by means of a set of concentric grooves machnined on the face of the flange, forming a sealing surface with far greater leakage path length than if the face were smooth, thus discouraging leakage of process fluid under pressure.
true
Twisting, soldering, crimping (using compression connectors), and clamping (either by the tension of a spring or under the compression of a screw) are some of the popular techniques for connecting electrical conductors together.
true
Unlike pipe fittings, tube fittings may be disconnected and reconnected with ease.
true
The direction of action of each instrument is a typical detail one can see on a loop diagram.
true
The Swagelok-brand provides a special gauge designed such that its thickness will fit between the nut and fitting shoulder if the nut is insufficiently tightened, but will not fit if it is sufficiently tightened.
true
Tube fittings designed to connect a tube to pipe threads are called unions.
false
Both measurement devices and the final control device connect to some physical system called the “process”.
true
Tee fittings join three fluid lines together.
true
It is typical to view the flow of the process as well as the “flow” of information between instruments measuring and controlling the process in a process flow diagram (PFD).
false
