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Preguntas del test (33)
1To measure current in a circuit, without a clamp on probe, you must measure in ______, and the circuit must be _______
- AA. parallel, de-energized
- BB. series, de-energized
- CC. parallel, energized
- DD. series, energized
2To change a 4–20 mA analog signal from a transmitter to the signal required by a digital controller, a(n) _____ must be between the transmitter and controller in the measurement loop.
- AA. I/P transducer
- BB. P/I transducer
- CC. DP transmitter
- DD. A/D converter
3In a bubbler (dip tube) level measuring system, for a bubble to be emitted at the open end of the purge pipe, the air pressure at that point is _______ the pressure exerted by the liquid at that point.
- AA. twice
- BB. equal to
- CC. less than
- DD. three times
4In order to provide a sample to a gas chromatograph or other extractive field analytical instrument at the proper temperature, pressure, flow, or concentration to make it most compatible with the analyzer, the sample should pass through a ____________ prior to entering the analyzer chamber.
- AA. glass capillary tube
- BB. sample probe calibration system
- CC. sample conditioning system
- DD. smooth-walled pipe
5Primary standard reference units and physical constants are maintained by ________.
- AA. NIST
- BB. testing labs
- CC. instrument techs
- DD. the plant instrument shop
6In logical analysis troubleshooting, which step comes immediately after the first step: “Identify and define the problem”?
- AA. Implement a solution or conduct a test.
- BB. If the problem is not resolved, reiterate until the problem is found and resolved.
- CC. Gather information about the problem.
- DD. Evaluate the information/data.
7An instrument location plan shows the _________ of each instrument
- AA. location and wiring plan
- BB. location, elevation, and tag number
- CC. specification number and tag number
- DD. location, specification number, and elevation
8Which of the following valve actuation methods would be the best choice for an application that requires a very large force and a small actuator?
- AA. pneumatic actuation
- BB. hydraulic actuation
- CC. manual actuation
- DD. electrical actuation
91. Hydrostatic head is another way of expressing:
- AA. gallons.
- BB. pressure.
- CC. length.
- DD. mass.
10 All physical measurements arise from the fundamental quantities of:
- AA. mass, length, and time.
- BB. density, viscosity, and specific gravity.
- CC. flow, volume, and temperature.
- DD. pressure, density, and specific gravity.
11Which of the following is true of most pressure measurement methods?
- AA. They are not able to measure a small differential pressure.
- BB. The sensor matches the digital or analog signal conditioning and transmission.
- CC. They are sensitive to volume but not temperature.
- DD. They measure pressure by sensing the deflection of the diaphragm.
12A fluid is flowing through a 10-inch diameter pipe at a velocity of 6 ft/sec. When the pipe reduces to an 8-inch diameter, and all other flowing parameters remain the same, the fluid velocity becomes ________ ft/sec.
- AA. 2.550
- BB. 6.075
- CC. 9.375
- DD. 12.75
13When connecting a “K” type thermocouple to a control system where extension wires are required, it is important to use only properly installed “KX” extension wires because:
- AA. this prevents the formation of a second temperature measurement junction.
- BB. the manufacturer’s warranty for the thermocouple would be voided if “KX” extension wire is not used.
- CC. “KX” thermocouple extension wire comes with special connectors for making the connection.
- DD. “KX” thermocouple extension wire is cheaper than “JX” thermocouple extension wire and reduces installation cost.
14Which of the following calibration instruments will be the best choice to calibrate a high-range electronic pressure transmitter for a range of 0–1000 psig?
- AA. decade box
- BB. squeeze bulb
- CC. function generator
- DD. dead-weight tester
15Which troubleshooting technique replaces suspected bad components until the problem is found?
- AA. Substitution method
- BB. Consultation method
- CC. "Remove and conquer" method
- DD. Fault insertion method
16Which of the following describes a controller in which an increase in the process variable results in an increase in the output to the manipulated variable?
- AA. reverse acting
- BB. direct acting
- CC. nonlinear
- DD. fail safe
17A controller is being tuned for a fast control loop. It has proportional action and the gain has been adjusted for a value by the technician. As reset action is added to the loop, which of the following will need to take place?
- AA. add derivative
- BB. increase the gain
- CC. decrease the gain
- DD. increase the dead time
18You have a standard pneumatic instrument loop with a span of 200 units. What is the steady state gain?
- AA. 0.06 psig/unit
- BB. 0.07 psig/unit
- CC. 0.08 psig/unit
- DD. 0.12 psig/unit
19A circuit has a 100 Ω resistor, a 50 Ω resistor, and a 200 Ω resistor all in parallel with each other. What is the total resistance of the circuit?
- AA. 28.6 Ω
- BB. 35.0 Ω
- CC. 175 Ω
- DD. 0.28 M Ω
20Which of the following is a valid form of the PID algorithm?
- AA. Proportional and derivative modes on error, integral on measurement
- BB. Proportional and integral modes on measurement, derivative on error
- CC. Proportional, integral, and derivative modes on error
- DD. Proportional, integral, and derivative modes on measurement
21In troubleshooting a system failure, a suspected bad component is replaced with a known good component. This does not correct the problem. What is the next best course of action?
- AA. build software traps involving additional logic and code to detect the problem
- BB. further analyze the problem and collect additional data as necessary
- CC. set additional alarms to pinpoint the problem
- DD. retain a consultant who specializes in this type of repair
22Which of the following is most typical regarding loop diagrams?
- AA. They are relatively inexpensive to produce.
- BB. They are produced on an as-needed basis after the plant is running.
- CC. They show both the minimum and optional items that are required.
- DD. They are typically developed by a company's engineering staff.
23Which of the following measurement methods is most cost effective for measuring the level of a highly corrosive media?
- AA. radioactive
- BB. ultrasonic
- CC. capacitance
- DD. float
24A switch placed to sense when a mechanism has reached the end of its travel is called:
- AA. a limit switch
- BB. a terminator
- CC. a solenoid
- DD. Form C contacts
251. Design Standards are defined as standards which:
- AA. Are least able to be enforced by regulatory bodies.
- BB. Are imposed by agencies such as OSHA, etc.
- CC. Have been agreed upon by various regulating bodies and refer to all aspects of defining quality and methods of fabrication or installation of materials and equipment.
- DD. Are developed by design companies.
262. Mandatory Standards are defined as standards:
- AA. Grouped within codes, supplemented by rules and regulations.
- BB. And conventions set by trade groups.
- CC. Which refer to content and presentation of documents.
- DD. None of the above
273. Data sheets:
- AA. Convey all useful information about an instrument.
- BB. Constitute a short form of specifications for an individual instrument or instrument type.
- CC. Contain necessary process data, physical maintenance requirements, environmental conditions, electrical requirements, and expected operational behavior for the instrument.
- DD. All of the above
281. A process is _______________ if heat is produced by a reaction.
- Aendothermic
- Bcontinuous
- Cintermittent
- Dexothermic
292. A process is _______________ if heat input is required to produce a reaction.
- Aendothermic
- Bcontinuous
- Cintermittent
- Dexothermic
30The span, in inches of water, of a differential pressure transmitter used to measure the full level of a tank that is 5 ft, 6 in high and contains a process material with a specific gravity of 0.9 should be:
- A73.3
- BB. 59.4
- CC. 66.0
- DD. 5.6
31A 0-30 psig gage is undergoing calibration. Starting at 0 psi, the technician applies a pressure of 15 psi. The gage reads 14.9 psi. Then the technician applies 30 psi of pressure. The technician then reduces the calibration pressure to 15 psi. The gage reads 15.2 psig. What type of error do these readings suggest?
- AA. hysteresis error
- BB. span error
- CC. zero shift error
- DD. linearity error
32A plant has a 30-foot-high water tank mounted on top of a 70-foot platform. What is the water level in the tank, measured in feet, if a pressure gage on the first floor, height 5 ft, reads 40 psi?
- AA. 22.3
- BB. 27.3
- CC. 30
- DD. 10
33A ground loop on shielded cable can be avoided by:
- AA. Attaching a safety ground to the instrument casing
- BB. Grounding the shield at only one end of the circuit
- CC. Attaching a safety ground to the control panel
- DD. Grounding the shield at both ends of the cable
Información
- Descripción
- Test sobre Sin título, creado por hatim ahmed el 31/10/2017.
- Autor
- hatim ahmed
- Idioma
- English
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