Instrumentation NCCER Study
Guide Comprehensive
Questions (Frequently Tested)
with Verified Answers Graded
A+
When inspecting a regulator control nitrogen pad system on a large storage tank and no
pressure is found what critical item besides a regulator should be checked? - Answer: air supply
What type of service should Teflon paste never be used on? - Answer: service oxygen lines. PTFE
materials are not recommended for service on oxygen lines due to their anaerobic nature.
A What is the principle behind how a solenoid valve opens? - Answer: it consists of a valve body,
a magnetic core attached to a valve stem, and a solenoid coil that works of inductance.
Which of the following gasses should be used to purge tubing and pipe after cleaning? - Answer:
nitrogen
What is the final step in commissioning; what should be the final step? - Answer: gathering all
the documentation
, In reference to PID controller, reset relates to which variable? - Answer: reset or integral
provides an output that is proportional to the time integral of the input. Eliminates offset.
An employee deenergizes a piece of equipment by removing the power plug from the outlet, if
the employees continue to hold the power plug once removed. The employee is said to have
what type of control over the energy potential? - Answer: exclusive control
The output of a thermocouple is expressed in what units? - Answer: milli volts (mV)
A differential pressure transmitter mounted on a non-vented tank is used to measure the
_______ of the vessel? - Answer: level
When properly calibrated and installed the most accurate primary flow element is the
________? - Answer: venturi tubes
What is the primary disadvantage of a direct operated regulator? - Answer: non adjustable
What is the advantage of a pilot operated regulator? - Answer: The pilot regulator typically
includes proportional band adjustments for verifying the sensitivity.
A valve has linear characteristic when __________. - Answer: flow rate provided is proportional
to the amount of value lift
What type of input signal does a valve actuator receive from a V/P transducer? - Answer:
pneumatic signal
What does it mean to say that the controller is reverse acting? - Answer: decreases the output
signal when the measured medium increases
Guide Comprehensive
Questions (Frequently Tested)
with Verified Answers Graded
A+
When inspecting a regulator control nitrogen pad system on a large storage tank and no
pressure is found what critical item besides a regulator should be checked? - Answer: air supply
What type of service should Teflon paste never be used on? - Answer: service oxygen lines. PTFE
materials are not recommended for service on oxygen lines due to their anaerobic nature.
A What is the principle behind how a solenoid valve opens? - Answer: it consists of a valve body,
a magnetic core attached to a valve stem, and a solenoid coil that works of inductance.
Which of the following gasses should be used to purge tubing and pipe after cleaning? - Answer:
nitrogen
What is the final step in commissioning; what should be the final step? - Answer: gathering all
the documentation
, In reference to PID controller, reset relates to which variable? - Answer: reset or integral
provides an output that is proportional to the time integral of the input. Eliminates offset.
An employee deenergizes a piece of equipment by removing the power plug from the outlet, if
the employees continue to hold the power plug once removed. The employee is said to have
what type of control over the energy potential? - Answer: exclusive control
The output of a thermocouple is expressed in what units? - Answer: milli volts (mV)
A differential pressure transmitter mounted on a non-vented tank is used to measure the
_______ of the vessel? - Answer: level
When properly calibrated and installed the most accurate primary flow element is the
________? - Answer: venturi tubes
What is the primary disadvantage of a direct operated regulator? - Answer: non adjustable
What is the advantage of a pilot operated regulator? - Answer: The pilot regulator typically
includes proportional band adjustments for verifying the sensitivity.
A valve has linear characteristic when __________. - Answer: flow rate provided is proportional
to the amount of value lift
What type of input signal does a valve actuator receive from a V/P transducer? - Answer:
pneumatic signal
What does it mean to say that the controller is reverse acting? - Answer: decreases the output
signal when the measured medium increases
