Instrumentation

Question 1

Impulse tubing carries the signal from the___ to the____.

Answer 1

Process to the transmitter

Question 2

Process tubing should be routed as____ as possible.

Answer 2

Short

Question 3

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

Answer 3

Upward

Question 4

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

Answer 4

Downward

Question 5

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

Answer 5

Taps

Question 6

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

Answer 6

Electric

Question 7

Most wiring methods incorporate the use of ____

Wiring.

Answer 7

Twisted pair with shields

Question 8

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

Answer 8

Automation

Question 9

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

Answer 9

chatter

Question 10

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

Answer 10

chip

Question 11

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.)

Answer 11

accuracy

Question 12

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

Answer 12

electrical interference

Question 13

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

Answer 13

debug

Question 14

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

Answer 14

Deviation

Question 15

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 _____.

Answer 15

Drift

Question 16

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

Answer 16

Life cycle

Question 17

Process and instrumentation diagrams are often referred o by the abbreviation

Answer 17

P & ID

Question 18

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

Answer 18

Power supply

Question 19

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

Answer 19

Repeatability

Question 20

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

Answer 20

proof pressure

Question 21

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

Answer 21

Recovery time

Question 22

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

Answer 22

Reproducibility

Question 23

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 ____.

Answer 23

Test point

Question 24

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

Answer 24

Preventative maintenance

Question 25

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

Answer 25

process variables

Question 26

PM schedules will often incorporate ____ troubleshooting steps into the procedure

Answer 26

predetermined

Question 27

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

Answer 27

1. Accuracy 2. Functionality 3. Signal 4. Repeatability

Question 28

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

Answer 28

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

Question 29

The first step when beginning a maintenance or troubleshooting procedure is_____

Answer 29

Remove power sources and supply pressures.

Question 30

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

Answer 30

Loop wiring

Question 31

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

Answer 31

intrinsically

Question 32

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

Answer 32

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

Question 33

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.

Answer 33

Faulty

Question 34

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

Answer 34

4mA

Question 35

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

Answer 35

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

Question 36

Group of instruments working together to control a process variable

Answer 36

control loop

Question 37

Name the 5 instruments comprising a control loop

Answer 37

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

Question 38

Pneumatic Instruments

Answer 38

Powered by Air or gas

Question 39

Power by electricity

Answer 39

Electronic Instruments

Question 40

3 types of signals for electronic instruments

Answer 40

Analog, Digital, Analog Digital Hybrid

Question 41

Final Control Element

Answer 41

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

Question 42

The accumulated error of each device in the loop

Answer 42

Loop error

Question 43

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

Answer 43

Set point

Question 44

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

Answer 44

Process

Question 45

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

Answer 45

Process variable