INSTRUMENTATION FINAL NRCC EXAM QUESTIONS WITH VERIFIED ANSWERS LATEST UPDATE
2026
What does an O2 sensor in a boiler stack do? - Answers To make sure the boiler is running
efficiently and make sure there is a good fuel to oxygen ratio.
Intrinsically Safe - Answers A protection feature for the safe operation of electronic equipment
in explosive atmospheres and/or under irregular operating conditions.
What are three temperature scales? - Answers Fahrenheit, Celsius, Kelvin
Manometer - Answers A device for measuring pressure with a liquid filled tube.
Thermowell - Answers A closed tube used to protect a temperature instrument from process
conditions and allow instrument maintenance to be performed w/o draining the process fluid.
What is OSHA? - Answers Occupational Safety and Health Administration is a federal agency that
develops and enforces workplace safety guidelines.
ControlNet - Answers A Real-time device network providing for high-speed transport of time-
critical I/O data, messaging, peer to peer communications, and the uploading and downloading
of programs.
DeviceNet - Answers Byte-wide network that can support 64 nodes and a maximum of 2048
field I/O devices.
DIN rail - Answers A narrow channel of metal - made of bent sheet steel or extruded aluminum -
with edges designed for plastic components to "clip" on.
Endothermic reaction - Answers A reaction that ABSORBS energy in the form of heat. Therefore
more heat and energy needs to be added to sustain the reaction.
2 Ways heat is transferred - Answers convection and conduction
Viscosity - Answers A liquid's resistance to flowing
hygrometer - Answers A humidity analyzer that measures the physical and electrical changes
that occur in various materials as they absorb or release moisture.
triple point of water - Answers temperature and pressure at which water will coexist as a solid,
liquid, gas.
Static Head - Answers Pressure of a fluid due to the head of fluid above some reference point.
, Material Mass Flow Meter - Answers Is used to measure the actual quantity of mass of a flowing
liquid.
Dry leg - Answers Impulse line that is filled with a noncondensing gas used to protect an
instrument.
specific gravity - Answers The ratio of a density of fluid to the density of reference fluid.
Reynolds number - Answers The ratio of inertial forces to viscous forces. (How laminar and
turbulent flow is)
ORP - Answers oxidation-reduction potential
Heatsink - Answers removes heat from electronic components
Fieldbus - Answers Serial - two way communication network
variable area flow meter - Answers maintains a constant differential pressure and allows the
flow area to change with flow rate. An example is a rotometer.
What is the voltage drop across a diode? - Answers 0.7v
MAC address - Answers Media Access Control Address - machines physical address
Economizer - Answers Heat exchanger used to reduce energy consumption
BCD display - Answers Binary Coded Decimal - A numbering system that uses groups of four bits
to represent a group of decimal numbers.
Optocoupler - Answers A device used to isolate electronic devices by using diodes and light.
convert psig to psia - Answers add 14.7 to the gauge
What does CR1 stand for? - Answers Control Relay 1
What does K1 stand for? - Answers Relay 1
Cascade control - Answers A control technique where a primary controller adjusts the setpoint
of a secondary controller.
Zero Suppression - Answers When a transmitter is mounted below the bottom of a tank.
Zero elevation - Answers When the transformer is mounted above the bottom of the tank.
Resolver - Answers type of rotary electrical transformer used for measuring degrees of rotation.
Split Range Control - Answers Output of a controller is split and sent to two or more control
valves.
2026
What does an O2 sensor in a boiler stack do? - Answers To make sure the boiler is running
efficiently and make sure there is a good fuel to oxygen ratio.
Intrinsically Safe - Answers A protection feature for the safe operation of electronic equipment
in explosive atmospheres and/or under irregular operating conditions.
What are three temperature scales? - Answers Fahrenheit, Celsius, Kelvin
Manometer - Answers A device for measuring pressure with a liquid filled tube.
Thermowell - Answers A closed tube used to protect a temperature instrument from process
conditions and allow instrument maintenance to be performed w/o draining the process fluid.
What is OSHA? - Answers Occupational Safety and Health Administration is a federal agency that
develops and enforces workplace safety guidelines.
ControlNet - Answers A Real-time device network providing for high-speed transport of time-
critical I/O data, messaging, peer to peer communications, and the uploading and downloading
of programs.
DeviceNet - Answers Byte-wide network that can support 64 nodes and a maximum of 2048
field I/O devices.
DIN rail - Answers A narrow channel of metal - made of bent sheet steel or extruded aluminum -
with edges designed for plastic components to "clip" on.
Endothermic reaction - Answers A reaction that ABSORBS energy in the form of heat. Therefore
more heat and energy needs to be added to sustain the reaction.
2 Ways heat is transferred - Answers convection and conduction
Viscosity - Answers A liquid's resistance to flowing
hygrometer - Answers A humidity analyzer that measures the physical and electrical changes
that occur in various materials as they absorb or release moisture.
triple point of water - Answers temperature and pressure at which water will coexist as a solid,
liquid, gas.
Static Head - Answers Pressure of a fluid due to the head of fluid above some reference point.
, Material Mass Flow Meter - Answers Is used to measure the actual quantity of mass of a flowing
liquid.
Dry leg - Answers Impulse line that is filled with a noncondensing gas used to protect an
instrument.
specific gravity - Answers The ratio of a density of fluid to the density of reference fluid.
Reynolds number - Answers The ratio of inertial forces to viscous forces. (How laminar and
turbulent flow is)
ORP - Answers oxidation-reduction potential
Heatsink - Answers removes heat from electronic components
Fieldbus - Answers Serial - two way communication network
variable area flow meter - Answers maintains a constant differential pressure and allows the
flow area to change with flow rate. An example is a rotometer.
What is the voltage drop across a diode? - Answers 0.7v
MAC address - Answers Media Access Control Address - machines physical address
Economizer - Answers Heat exchanger used to reduce energy consumption
BCD display - Answers Binary Coded Decimal - A numbering system that uses groups of four bits
to represent a group of decimal numbers.
Optocoupler - Answers A device used to isolate electronic devices by using diodes and light.
convert psig to psia - Answers add 14.7 to the gauge
What does CR1 stand for? - Answers Control Relay 1
What does K1 stand for? - Answers Relay 1
Cascade control - Answers A control technique where a primary controller adjusts the setpoint
of a secondary controller.
Zero Suppression - Answers When a transmitter is mounted below the bottom of a tank.
Zero elevation - Answers When the transformer is mounted above the bottom of the tank.
Resolver - Answers type of rotary electrical transformer used for measuring degrees of rotation.
Split Range Control - Answers Output of a controller is split and sent to two or more control
valves.
