I&C Technician Sample Questions
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Questions and Answers

Which characteristic distinguishes thermocouple extension wire from regular thermocouple-grade wire?

  • Insulation color
  • Thickness
  • Special markings on wire’s insulation
  • Outer sheath color (correct)

    • What type of dynamic fluid effect is illustrated by a flag flapping in the breeze?

  • Transitional flow
  • Coriolis effect
  • Vortex shedding (correct)
  • Inertial effects

    • What flow condition is necessary for accurate operation of orifice plate flow meters?

  • Turbulent flow
  • Fully-developed turbulent flow (correct)
  • Transitional flow
  • Plug flow

    • What does Cascade control involve?

    <p>One controller providing a set point for another controller</p> Signup and view all the answers

    What type of signal is associated with a mechanical input to an electronic transmitter?

    <p>Mechanical signal</p> Signup and view all the answers

    Where should one look to understand the meaning of a symbol on a P&ID?

    <p>Master sheet</p> Signup and view all the answers

    What condition describes Quarter-wave damping in control systems?

    <p>Good control with rapid oscillation decay</p> Signup and view all the answers

    What happens to an incompressible fluid as it moves through a restriction?

    <p>Velocity increases and pressure decreases</p> Signup and view all the answers

    Which temperature sensing element is considered the most linear?

    <p>RTD</p> Signup and view all the answers

    What metals are used to construct a type K thermocouple?

    <p>Chromel and Alumel</p> Signup and view all the answers

    When converting a level measurement system from a dry leg to a wet leg, which calibration aspect must be changed?

    <p>Transmitter’s zero</p> Signup and view all the answers

    Under what condition are flow-straightening vanes necessary for orifice plates?

    <p>Insufficient straight-pipe length exists</p> Signup and view all the answers

    What condition could result in pressure gauge A showing a higher reading than pressure gauge B in a liquid process?

    <p>High flow rate from left to right</p> Signup and view all the answers

    Which level measurement technology is least likely to maintain accuracy with changing liquid density?

    <p>Differential pressure transmitter</p> Signup and view all the answers

    What is the primary purpose of performing an 'As Found' calibration on a pressure transmitter?

    <p>To establish a baseline for detecting drift</p> Signup and view all the answers

    Which of the following is NOT a typical method for measuring pH in a process?

    <p>Conductivity measurement</p> Signup and view all the answers

    What is the primary purpose of a control valve positioner?

    <p>Increase the accuracy of valve positioning</p> Signup and view all the answers

    How does an alkaline solution typically rank in pH value?

    <p>Greater than 5</p> Signup and view all the answers

    In a process with constant differential pressure, which valve characteristic is most suitable?

    <p>Linear</p> Signup and view all the answers

    What should be verified before connecting an ohmmeter to a circuit?

    <p>Circuit is electrically dead</p> Signup and view all the answers

    Given a drop in pressure of 19 PSID, what is the necessary Cv rating for a control valve at a maximum flow rate of 250 GPM?

    <p>54.41</p> Signup and view all the answers

    When classifying control valves, which of the following order represents the types in a typical setup?

    <p>Ball, Gate, Butterfly, Plug</p> Signup and view all the answers

    In calculating Cv rating for a liquid service control valve, which factors must be considered?

    <p>Pressure drop, specific gravity, maximum flow rate</p> Signup and view all the answers

    What is a common unit for expressing reset control action?

    <p>Percent</p> Signup and view all the answers

    Study Notes

    I&C Technician Sample Questions & Answers

    • Question 1: The most linear temperature sensing element is an RTD.

    • Question 2: A type K thermocouple is made from Chromel and Alumel.

    • Question 3: If a level measurement system changes from a dry leg to a wet leg, the transmitter's zero needs to be changed.

    • Question 4: Flow-straightening vanes are used upstream of orifice plate flow elements when insufficient straight-pipe length exists, or when the process fluid is a gas.

    • Question 5: A high rate of flow from left to right (top to bottom) in a liquid process could cause pressure gauge A to register a greater pressure than pressure gauge B.

    • Question 6: A differential pressure transmitter will not maintain accurate liquid height measurement in a vessel with unpredictable density changes.

    • Question 7: The purpose of an “As Found” calibration on a pressure transmitter is to establish a baseline for comparison to detect calibration drift.

    • Question 8: The LRV for the given DP-based liquid level measurement system is 84 "H2O and URV is 444 "H2O.

    • Question 9: A load cell cannot be adapted to measure solid (powder) levels in a vessel.

    • Question 10: A guided-wave radar transmitter measures liquid interface levels based on differences in the dielectric constant between the two liquids.

    • Question 11: The hydrostatic pressure at the bottom of a vessel holding 12 vertical feet of liquid with a density of 50 lb/ft3 is 14.98 PSI.

    • Question 12: The negative lead of a thermocouple in North America is colored black.

    • Question 13: Reference junction compensation is necessary in thermocouple-based temperature instruments because the reference junction generates a temperature-dependent voltage.

    • Question 14: Thermocouple extension wire can be distinguished from regular thermocouple wire by its outer sheath color.

    • Question 15: As an incompressible fluid moves through a restriction, velocity increases and pressure decreases.

    • Question 16: For accurate orifice plate flow meters, fully-developed turbulent flow is required.

    • Question 17: Based on the relative position of the transmitter and orifice plate, this flow measuring installation is suitable for gas flow.

    • Question 18: If the flow measurement range is decreased to 0 to 700 GPH, the new calibration range for the DP transmitter is 0 to 34.03 "H2O.

    • Question 19: A thermal flowmeter inherently measures mass flow rate.

    • Question 20: The pH of a liquid solution is a measure of hydrogen ion activity

    • Question 21: Flue gas oxygen measurement is important in combustion control systems for reducing NOx emissions.

    • Question 22: A chromatograph separates molecule types in a fluid stream by adsorption time-delay.

    • Question 23: ORP measurement is often used where the addition of an oxidant must be controlled.

    • Question 24: A varying voltage is an analog signal.

    • Question 25: Computers rely on sensors for input signals.

    • Question 26: A suppressed zero in a DP cell means the transmitter is located below the 0% liquid level mark.

    • Question 27: The height of the building and flow rate must be determined prior to selecting a hydronic circulator.

    • Question 28: The minimum wall thickness of pipe for a hydraulic system is Schedule 40 pipe.

    • Question 29: Fluid power actuators convert fluid to motion.

    • Question 30: A buffer solution is used to calibrate pH probes.

    • Question 31: A flue gas oxygen measurement is important to reduce NOx emissions in combustion control systems.

    • Question 32: Feedforward control reduces the effect of process variable noise on stability.

    • Question 33: In PLC programming, a retentive function defaults to the "off" state and is not reset after a power cycle.

    • Question 34: When noise is present and offset isn't acceptable in a control application, PID control is used.

    • Question 35: Voltage between terminals 15 and 16 depends on flow rate.

    • Question 36: A load disturbance is a deviation from set point due to load variation.

    • Question 37: The correct ring type joint RTJ gasket for a hydraulic line is type D (crush ring).

    • Question 38: Integer variables in a digital control system are used to represent the status of single switches or count discrete events.

    • Question 39: The statement that the standard analog signal 4-20 mA is the most common and used in the process control industry today is true.

    • Question 40: To get the best pumping rate from a two-pipe convertible deep well jet system, open the pump discharge control valve fully.

    • Question 41: Digital control systems are generally superior to analog systems but are less user friendly.

    • Question 42: A triple modular redundant (TMR) digital control system is used to control a dangerous process.

    • Question 43: A symbol of a pneumatic valve is a combination of a cross and a circle (like the letter 'D').

    • Question 44: PPE stands for Personal Protective Equipment.

    • Question 45: Increasing spring tension on a valve causes it to open more quickly.

    • Question 46-48: Instructions and descriptions for the related instruments.

    • Question 49: In an instrument needing calibration, the zero adjustment is usually done first.

    • Question 50: A pressure switch activates the motor of an instrument air compressor.

    • Question 51: The calculated fluid pressure working against the piston, given a force and piston diameter, is 1082.3 PSI.

    • Question 52: The proper sequence for taking a differential pressure transmitter out of service, using a three-valve manifold and bleed, is closing one block valve and opening the equalizing valve and then opening the bleed.

    • Question 53: The warning lamp of a charging system is activated by a difference in voltage.

    • Question 54: A maximum pressure relief valve is typically mounted on the tank.

    • Question 55-70: Instructions and descriptions related to various parameters.

    • Question 71-84: Instructions related to various instruments and their purposes.

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    I&C Technician Sample Question & Answer PDF

    Description

    Test your knowledge with these sample questions for I&C technicians. The quiz covers various topics including temperature sensing elements, level measurement systems, and differential pressure transmitters. Perfect for those preparing for exams or looking to refresh their understanding of instrumentation and control.

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