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5th > Instrumentation > Flashcards

Instrumentation Flashcards

1
Q

Impulse tubing carries the signal from the___ to the____.

A

Process to the transmitter

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2
Q

Process tubing should be routed as____ as possible.

A

Short

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3
Q

Process tubing should be routed____ from the transmitter to the process for liquid measurement

A

Upward

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4
Q

Process tubing should be routed___from the transmitter to the process for gas measurement.

A

Downward

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5
Q

The purge connections should be as close to the ____as possible.

A

Taps

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6
Q

It is the ____signal that carries the process variable from an electronic transmitter to the controller.

A

Electric

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7
Q

Most wiring methods incorporate the use of ____

Wiring.

A

Twisted pair with shields

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8
Q

The act or method of making a processing or manufacturing system without the necessary operator intervention; to operate independently is called

A

Automation

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9
Q

The rapid cycling on and off of a device in a control process is called _____.

A

chatter

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10
Q

An integrated circuit is often called a(n) ____.

A

chip

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11
Q

The conformity to an indicated, standard, or true value, usually expressed as a percentage deviation (of span, reading, or upper-range value) from the indicated, standard, or true value is referred to as the ___ of the device.)

A

accuracy

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12
Q

The electrical noise induced upon the signal wires that obscures the wanted information is called _____

A

electrical interference

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13
Q

To find and correct mistakes in a program is to ___ a control program.

A

debug

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14
Q

The departure from a desired value. The system deviation that exists after the process has been stabilized is called_____.

A

Deviation

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15
Q

A change of reading or a set point value over log periods due to several factors, including change in ambient temperature, time, and line voltage is called _____.

A

Drift

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16
Q

The minimum number of cycles a transducer can endure and remain within a specified tolerance is called the ___ of the device.

A

Life cycle

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17
Q

Process and instrumentation diagrams are often referred o by the abbreviation

A

P & ID

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18
Q

A separate unit or part of a circuit that supplies power to the rest of the circuit or system is called a_____

A

Power supply

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19
Q

The ability of an instrument to provide the same output signal given the identical input is referred to as_____.

A

Repeatability

20
Q

The specified pressure which may be applied to the sensing element of a transducer without causing permanent change in the output characteristics is called ______.

A

proof pressure

21
Q

The length of time it takes a transducer to return to normal after a proof-pressure has been applied is called _____.

A

Recovery time

22
Q

The exactness with which a measurement or other condition can be duplicated over time is called _____.

A

Reproducibility

23
Q

A process connection in which no instrument is permanently connected, but which is intended for the temporary or intermittent connection of an instrument is called a ____.

A

Test point

24
Q

A _____ schedule is often adopted by a working site as a possible security measure to detect faulty devices.

A

Preventative maintenance

25
Q

Online testing is procedure that allows the testing of a device while it is recording and transmitting ____.

A

process variables

26
Q

PM schedules will often incorporate ____ troubleshooting steps into the procedure

A

predetermined

27
Q

List several error sources and/or accuracy tests that regular PM schedules are written to test for: (4)

A
  1. Accuracy
  2. Functionality
  3. Signal
  4. Repeatability
28
Q

List several possible causes of an error signal that is not caused by the device

A
  1. Faulty wiring
  2. Termination points
  3. Configuration in controllers
  4. Location
  5. Weather change
29
Q

The first step when beginning a maintenance or troubleshooting procedure is_____

A

Remove power sources and supply pressures.

30
Q

When using a smart communicator, potential causes of communications failure generally lie with the ____.

A

Loop wiring

31
Q

A possible source of communication error is at any____ wiring barriers that are in the loop wiring.

A

intrinsically

32
Q

Briefly list the steps that can be taken to diagnose a signal that has an error that is consistently high.

A
  1. Check process tubing, look for leaks and breaks, or potential blockages.
  2. Check power supply output voltage, and check voltages at devices.
  3. Check transmitter electronics
33
Q

For smart instruments, the power supply should have its output verified as to whether it is within an established working range for a voltage level to prevent___ readings.

A

Faulty

34
Q

What is the signal output of a Rosemount transmitter that is configured in the multidrop mode?

A

4mA

35
Q

If the instrument signal is low, how can the loop impedance play a role in limiting current?

A

If the loop impedance is too high, it will limit the output signal

36
Q

Group of instruments working together to control a process variable

A

control loop

37
Q

Name the 5 instruments comprising a control loop

A

Sensing, Transmitting, Control, I/P, Final Control Element

38
Q

Pneumatic Instruments

A

Powered by Air or gas

39
Q

Power by electricity

A

Electronic Instruments

40
Q

3 types of signals for electronic instruments

A

Analog, Digital, Analog Digital Hybrid

41
Q

Final Control Element

A

The last active device in an instrument control loop. Directly controls the manipulated variable.

42
Q

The accumulated error of each device in the loop

A

Loop error

43
Q

The desired value where the process should be maintained is called the ___

A

Set point

44
Q

The variable for which supply and demand must be balanced-the system under control, excluding the equipment that does the controlling is called the____ .

A

Process

45
Q

The part of the process that changes, and therefore needs to be controlled, is called the___.

A

Process variable

5th (3 decks)

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