INSTRUMENTATION FINAL NRCC EXAM QUESTIONS AND
ANSWERS
What does an O2 sensor in a boiler stack do? - CORRECT ANSWER✅✅To make sure the boiler is running
efficiently and make sure there is a good fuel to oxygen ratio.
Intrinsically Safe - CORRECT ANSWER✅✅A protection feature for the safe operation of electronic
equipment in explosive atmospheres and/or under irregular operating conditions.
What are three temperature scales? - CORRECT ANSWER✅✅Fahrenheit, Celsius, Kelvin
Manometer - CORRECT ANSWER✅✅A device for measuring pressure with a liquid filled tube.
Thermowell - CORRECT ANSWER✅✅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? - CORRECT ANSWER✅✅Occupational Safety and Health Administration is a federal
agency that develops and enforces workplace safety guidelines.
ControlNet - CORRECT ANSWER✅✅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 - CORRECT ANSWER✅✅Byte-wide network that can support 64 nodes and a maximum of
2048 field I/O devices.
DIN rail - CORRECT ANSWER✅✅A narrow channel of metal - made of bent sheet steel or extruded
aluminum - with edges designed for plastic components to "clip" on.
Endothermic reaction - CORRECT ANSWER✅✅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 - CORRECT ANSWER✅✅convection and conduction
Viscosity - CORRECT ANSWER✅✅A liquid's resistance to flowing
hygrometer - CORRECT ANSWER✅✅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 - CORRECT ANSWER✅✅temperature and pressure at which water will coexist as a
solid, liquid, gas.
Static Head - CORRECT ANSWER✅✅Pressure of a fluid due to the head of fluid above some reference
point.
Material Mass Flow Meter - CORRECT ANSWER✅✅Is used to measure the actual quantity of mass of a
flowing liquid.
Dry leg - CORRECT ANSWER✅✅Impulse line that is filled with a noncondensing gas used to protect an
instrument.
specific gravity - CORRECT ANSWER✅✅The ratio of a density of fluid to the density of reference fluid.
Reynolds number - CORRECT ANSWER✅✅The ratio of inertial forces to viscous forces. (How laminar
and turbulent flow is)
ORP - CORRECT ANSWER✅✅oxidation-reduction potential
Heatsink - CORRECT ANSWER✅✅removes heat from electronic components
Fieldbus - CORRECT ANSWER✅✅Serial - two way communication network
ANSWERS
What does an O2 sensor in a boiler stack do? - CORRECT ANSWER✅✅To make sure the boiler is running
efficiently and make sure there is a good fuel to oxygen ratio.
Intrinsically Safe - CORRECT ANSWER✅✅A protection feature for the safe operation of electronic
equipment in explosive atmospheres and/or under irregular operating conditions.
What are three temperature scales? - CORRECT ANSWER✅✅Fahrenheit, Celsius, Kelvin
Manometer - CORRECT ANSWER✅✅A device for measuring pressure with a liquid filled tube.
Thermowell - CORRECT ANSWER✅✅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? - CORRECT ANSWER✅✅Occupational Safety and Health Administration is a federal
agency that develops and enforces workplace safety guidelines.
ControlNet - CORRECT ANSWER✅✅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 - CORRECT ANSWER✅✅Byte-wide network that can support 64 nodes and a maximum of
2048 field I/O devices.
DIN rail - CORRECT ANSWER✅✅A narrow channel of metal - made of bent sheet steel or extruded
aluminum - with edges designed for plastic components to "clip" on.
Endothermic reaction - CORRECT ANSWER✅✅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 - CORRECT ANSWER✅✅convection and conduction
Viscosity - CORRECT ANSWER✅✅A liquid's resistance to flowing
hygrometer - CORRECT ANSWER✅✅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 - CORRECT ANSWER✅✅temperature and pressure at which water will coexist as a
solid, liquid, gas.
Static Head - CORRECT ANSWER✅✅Pressure of a fluid due to the head of fluid above some reference
point.
Material Mass Flow Meter - CORRECT ANSWER✅✅Is used to measure the actual quantity of mass of a
flowing liquid.
Dry leg - CORRECT ANSWER✅✅Impulse line that is filled with a noncondensing gas used to protect an
instrument.
specific gravity - CORRECT ANSWER✅✅The ratio of a density of fluid to the density of reference fluid.
Reynolds number - CORRECT ANSWER✅✅The ratio of inertial forces to viscous forces. (How laminar
and turbulent flow is)
ORP - CORRECT ANSWER✅✅oxidation-reduction potential
Heatsink - CORRECT ANSWER✅✅removes heat from electronic components
Fieldbus - CORRECT ANSWER✅✅Serial - two way communication network
