I&C Technician Sample Questions

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.