Domain 1 / Calibration Flashcards
A gauge pressure of 195 PSI is roughly what in PSIA?
A. 151
B. 164
C. 178
D. 210
D. 210
What pressure, in PSI, would be indicated by an absolute pressure gauge that is lying on a work bench not connected to anything?
A. 0
B. 29
C. 14.7
D. 2.9
C. 14.7
Which of the following will have the highest pressure difference between the surface and 6 in. below the surface?
A. A 12 in. vertical straw filled with water
B. A 10 ft. diameter open tank filled with water
C. A 5 ft. diameter vertical pipe filled with water
D. None of the above, because the pressure difference in each is the same.
D. None of the above, because the pressure difference in each is the same.
If a cubic foot of water weighs 62.4 pounds in a one ft. cube, it exerts a pressure of how many pounds PSI on the bottom of the container?
A. 0.036
B. 2.308
C. 0.433
D. 14.7
C. 0.433
Hydrostatic head is another way of expressing:
A. Gallons
B. pressure
C. Length
D. Mass
B. Pressure
All physical measurements are based on the fundamental qualities of:
A. Mass, length, and time
B. Density, viscosity, and specific gravity
C. Flow, volume, and temperature
D. Pressure, density, and specific gravity
A. Mass, length, and time
Dividing the density of the process fluid by the density of _____ gives a dimensionless number called specific gravity.
A. Mercury or mercury vapors
B. Oil or natural gas
C. Water or air
D. Any known liquid or gas
C. Water or air
Gallons per minute is a unit of measurement for:
A. Level
B. Flow
C. Pressure
D. Temperature
B. Flow
As the speed (velocity) of a fluid increases through a restriction, the fluid pressure:
A. Increases
B. Decreases
C. Remains unchanged
D. First increases then decreases
B. Decreases
What Celsius temperature reading is within an oven temperature of 215 to 220 deg F?
A. 103
B. 110
C. 329
D. 338
A. 103
The difference between the indication of the instrument and the actual value of the measured variable is:
A. The controlled variable
B. Called set point
C. An error in the measuring instrument
D. Discarded
C. An error in the measuring instrument
Hydrostatic head, weight, radioactive properties, density, and sonic detectors are all used in what method of level measurement?
A. Point
B. Pressure
C. Inferential
D. Direct
C. Inferential
Differential pressure transmitters measure level by inference from:
A. Capacitance
B. Conductivity
C. Hydrostatic head
D. Thermal energy
C. Hydrostatic head
Thermal elements infer level by measuring:
A. Temperature
B. Capacitance
C. Thermal conductivity
D. Displacement
A. Temperature
All of the following types of level instruments can be used to detect the location of liquid surfaces except:
A. Capacitance
B. Float
C. Hydrostatic head
D. Ultrasonic
C. Hydrostatic head
The temperature range of a transmitter is 100 to 200 deg F. The output signal range is 3 - 15 PSIG. What would be the expected output signal for an input temperature of 150 deg F?
A. 6 PSIG
B. 9 PSIG
C. 11.25 PSIG
D. 12 PSIG
B. 9 PSIG
75% output on a 4-20 ma transmitter is:
A. 12 ma
B. 15 ma
C. 16 ma
D. 20 ma
C. 16 ma
What is the designation used for a transducer that converts current to voltage?
A. E/I
B. I/P
C. P/I
D. I/E
D. I/E
An instrument gives the same indication each time it measures a variable under identical conditions. This defines:
A. Static accuracy
B. Dynamic accuracy
C. Sensitivity
D. Repeatability
D. Repeatability
The range of values over which an input signal to a transmitter may be changed upon reversal of direction with no observable change in output is called:
A. Instrument accuracy
B. Reverse precision
C. Zero point
D. Dead band
D. Dead band
The steady state gain of a standard 4-20 mA electronic hydrostatic head level transmitter with a measurement range of 50 - 250 inches of water is:
A. 0.08 mA / inch of water
B. 0.10 mA / inch of water
C. 16 mA / 200 inches of water
D. 20 mA / 250 inches of water
A. 0.08 mA / inch of water
The temperature range of a transmitter is 0-200 deg. F. The output signal range is 3-15 PSIG. What would the expected output signal be for an input temperature of 150 deg. F?
A. 6 PSIG
B. 9 PSIG
C. 11.25 PSIG
D. 12 PSIG
D. 12 PSIG
Using ANSI / ISA standards, the red lead from a thermocouple or extension wire is always the ____ lead.
A. Positive
B. Negative
C. Neutral
D. Ground
B. Negative