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
A measurement instrument error is the difference between the actual value of the measured variable and:
A. It’s true value
B. The calibration standard
C. Input and output signals
D. The indication of the instrument
D. The indication of the instrment
To ensure the accuracy of a pneumatic controller throughout it’s range, you must precisely adjust all of the following EXCEPT:
A. supply pressure
B. input
C. span
D. zero
A. supply pressure
A device that converts alternating current to direct current is called:
A. rectifier
B. ratio station
C. differential amplifier
D. comparator
A. rectifier
A test instrument that displays a waveform is a(n)
A. function generator
B. ammeter
C. multi-meter
D. oscilloscope
D. oscilloscope
If an open tube manometer indicates 6.11 in. of HG, what is the pressure measurement?
A. 2 PSI
B. 3 PSIA
C. 17.89 PSIG
D. 3 PSIG
D. 3 PSIG
Which of the following could be used to calibrate a pressure gauge 0 - 800 PSI?
A. Dead weight tester
B. A mercury manometer
C. The plant instrument air supply
D. Multi-meter
A. Dead weight tester
2 PSI is equal to ____ inches of water.
A. 1
B. 27.7
C. 14.7
D. 55.4
D. 55.4
Which of the following is usually adjusted first when calibrating an electronic pressure transmitter?
A. Linearity
B. Span
C. Zero
D. Range
C. Zero
The calibration plot (Fig. 1-1, page 21) shows that the transmitter does need recalibration to correct for:
A. a zero error
B. a span error
C. both a zero and span error
D. a linearity error
A. a zero error
The calibration plot (Fig 1-2, page 21) indicates that the pneumatic controller has ______ and must be calibrated.
A. a zero error
B. a span error
C. both a zero and span error
D. a linearity error
C. both a zero and a span error
This electronic DP cell (Fig. 1-3, page 22) requires calibration to correct for the:
A. zero error
B. span error
C. zero, span, and linearity errors
D. zero and span errors
C. zero, span, and linearity errors
This pneumatic level transmitter (Fig. 1-4, page 22) has:
A. hysteresis
B. a zero error
C. a span error
D. zero, span, and linearity errors
D. zero, span, and linearity errors
_______ is a relative measure of the time delay between two events, states, or actions.
A. Backlash
B. Dead time
C. Hysteresis
D. Dead band
B. Dead time
This function symbol from ISA-5.1-1984 (R1992) – “Instrument Symbols and Identification” indicates a _____ in a primary location, normally accessible to the operator.
A. discrete instruments
B. shared display, shared control
C. programmable logic controller
d. a computer function
C. programmable logic controller
Which of the following symbols from ISA-5.1-1984 (1992) – “Instrument Symbols and Identification” is used to indicate shared display, shared control in a primary location normally accessible to the operator? (see photo)
A. (see photo)
This primary element (see photo) identifies a(n):
A. Oriface plate
B. venturi tube
C. vortex sensor
D. flow nozzle
A. oriface plate
The Reynolds No determines:
A. the venturi effect
B. the Coriolis acceleration
C. the fluid viscosity
D. if the flow is laminar or turbulent
D. If the flow is laminar or turbulent
The flow rate in gallons per minute of water with a specific gravity of 1 provided by a pressure differential of 1.0 PSI through a fully opened control valve is a definition of:
A. Cv
B. DP
C. Ov
D. SG
A. Cv
One significant advantage of an electromechanical actuator is:
A. low cost compared to pneumatic actuators
B. easily made “fail safe” (open or closed)
C. normally, very low maintenance requirements
D. it does not require clean, dry, instrument air
D. it does not require clean, dry, instrument air
A displacer has a diameter of 4 inches and a length of 30 inches. If it is submerged to a depth of 20 inches in a liquid with a specific gravity of 0.8, how many pounds of upward buoyancy force will be exerted on the displacer? (round all digits to the hundredths place)
A. 9.07
B. 7.238
C. 35.5
D. 426.3
B. 7.238
A plant has a 30 ft. high water tank mounted on top of a 70 ft. platform. What is the water level in the tank, measured in feet, if a pressure gauge on the first floor, height 5 ft, reads 40 PSI?
A. 22.3
B. 27.3
C. 30
D. 10
B. 27.3
A 0-30 PSIG gauge is being calibrated. Starting at 0 PSI, the technician apples a pressure of 15 PSI. The gauge reads 14.9 PSI. Then, the technician applies 30 PSI. When the pressure is reduced to 15 PSI the reading is 15.2 PSIG. What type of error might these readings indicate?
A. hysteresis error
B. span error
C. zero shift error
D. linearity error
A. Hysteresis error
If the range of a 3-15 PSI pneumatic transmitter is 50-350 deg. C, what is the output signal value, in PSI, at 198 deg. C?
A. 5.7
B. 7.2
C. 8.9
D. 12.6
C. 8.9
Memory is normally organized in bit words called:
A. bytes
B. instructions
C. nibblers
D. registers
A. bytes
In a test of the accuracy of a pneumatic comparator with a pressure gauge, presure readings of the test gauge and the gauge being tested are compared at a number of test points. Test readings are made:
A. only as the pressure is slowly increased
B. only as the presure is slowly decreased
C. in no particular sequence
D. as the pressure is increased and as the pressure is decreased
D. as the pressure is increased and the pressure is decreased
A properly calibrated pressure transmitter connected to a 20 ft. tall tank with a water level of 15 ft would indicate a pressure of approximately:
A. 19 PSIG
B. 10 PSIG
C. 180 inches of water
D. 150 inches of water
C. 180 inches of water
The span, in inches of water, of a differential pressure transmitter used to measure the full level of a tank that is 5 ft, 6 inches high contains a process material with a specific gravity of 0.9 should be:
A. 73.3
B. 59.4
C. 66.0
D. 5.6
59.4
Closing high and low pressure tap block valves, venting the low side to atmosphere and connecting and applying a known calibration pressure to the high side is done to check:
A. the condition of the block valves
B. tubing for leaks
C. zero and span of a DP cell
D. none of the above
C. zero and span of a DP cell
An oscilloscope waveform spans 5.5 vertical divisions. The vertical gain control is set at 2 volts/division. The approximate peak-to peak voltage of the signal represented on the oscilloscope is:
A. 33 volts
B. 22 volts
C. 11 volts
D. 2.75 volts
C. 11 volts
When checking the calibration of an instrument, the first information you should record should be:
A. original span
B. original zero
C. calibration data before adjustment
D. final calibration data
C. calibration data before adjustment
What is the value of a resistor that is color coded gray - black - orange - silver?
A. 51 Kohms +/- 10%
B. 80 Kohms +/- 10%
C. 51 ohms +/- 10%
D. 803 ohms +/- 10%
B. 80 Kohms +/- 10%
The time constant (first order lag) ina transmission system is the time necessary (after dead time) following an upset for the response curve to reach _________ of it’s final value.
A. 100%
B. 63.2%
C. 50%
D. 37.8%
B. 63.2%
Load cells and strain gauges measure the amount of material in a tank by measuring:
A. thermal conductivity
B. hydrostatic head
C. ultrasonic frquency
D. weight
D. weight
____________ is generally accepted as an 8-bit segment of a computer word.
A. Bus
B. Bit
C. Byte
D. Base
C. Byte
Which of the folowing is the most temporay form of information storage?
A. magnetic tape
B. EEPROM
C. hard disk
D. RAM
D. RAM
A hexidecimal value of 0D converts to _____________ binary.
A. 00101101
B. 00011001
C. 00010001
D. 00001101
D. 00001101
