Instrumentation NCCER Study Guide
questions with correct answers
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? -
CORRECT ANSWERS ✔✔air supply
What type of service should Teflon paste never be used on? - CORRECT
ANSWERS ✔✔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? - CORRECT
ANSWERS ✔✔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? - CORRECT ANSWERS ✔✔nitrogen
What is the final step in commissioning; what should be the final step? -
CORRECT ANSWERS ✔✔gathering all the documentation
In reference to PID controller, reset relates to which variable? - CORRECT
ANSWERS ✔✔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? - CORRECT ANSWERS
✔✔exclusive control
The output of a thermocouple is expressed in what units? - CORRECT
ANSWERS ✔✔milli volts (mV)
A differential pressure transmitter mounted on a non-vented tank is used to
measure the _______ of the vessel? - CORRECT ANSWERS ✔✔level
When properly calibrated and installed the most accurate primary flow
element is the ________? - CORRECT ANSWERS ✔✔venturi tubes
What is the primary disadvantage of a direct operated regulator? - CORRECT
ANSWERS ✔✔non adjustable
What is the advantage of a pilot operated regulator? - CORRECT ANSWERS
✔✔The pilot regulator typically includes proportional band adjustments for
verifying the sensitivity.
A valve has linear characteristic when __________. - CORRECT ANSWERS
✔✔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?
- CORRECT ANSWERS ✔✔pneumatic signal
What does it mean to say that the controller is reverse acting? - CORRECT
ANSWERS ✔✔decreases the output signal when the measured medium
increases
What does it mean to say that a controller is direct acting? - CORRECT
ANSWERS ✔✔increases its output signal when the measure medium
increases
How does fail open relate to air to close? - CORRECT ANSWERS ✔✔without
the control medium, it stays open; to close, the the control medium must be
applied
What does the term fail open mean in relation to valve actuators? - CORRECT
ANSWERS ✔✔
For a temperature of 1500F, what is a common gasket material? - CORRECT
ANSWERS ✔✔ceramic gaskets
Any person working near energized equipment during lockout tagout is
considered what type of
employee? - CORRECT ANSWERS ✔✔affected employee
questions with correct answers
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? -
CORRECT ANSWERS ✔✔air supply
What type of service should Teflon paste never be used on? - CORRECT
ANSWERS ✔✔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? - CORRECT
ANSWERS ✔✔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? - CORRECT ANSWERS ✔✔nitrogen
What is the final step in commissioning; what should be the final step? -
CORRECT ANSWERS ✔✔gathering all the documentation
In reference to PID controller, reset relates to which variable? - CORRECT
ANSWERS ✔✔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? - CORRECT ANSWERS
✔✔exclusive control
The output of a thermocouple is expressed in what units? - CORRECT
ANSWERS ✔✔milli volts (mV)
A differential pressure transmitter mounted on a non-vented tank is used to
measure the _______ of the vessel? - CORRECT ANSWERS ✔✔level
When properly calibrated and installed the most accurate primary flow
element is the ________? - CORRECT ANSWERS ✔✔venturi tubes
What is the primary disadvantage of a direct operated regulator? - CORRECT
ANSWERS ✔✔non adjustable
What is the advantage of a pilot operated regulator? - CORRECT ANSWERS
✔✔The pilot regulator typically includes proportional band adjustments for
verifying the sensitivity.
A valve has linear characteristic when __________. - CORRECT ANSWERS
✔✔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?
- CORRECT ANSWERS ✔✔pneumatic signal
What does it mean to say that the controller is reverse acting? - CORRECT
ANSWERS ✔✔decreases the output signal when the measured medium
increases
What does it mean to say that a controller is direct acting? - CORRECT
ANSWERS ✔✔increases its output signal when the measure medium
increases
How does fail open relate to air to close? - CORRECT ANSWERS ✔✔without
the control medium, it stays open; to close, the the control medium must be
applied
What does the term fail open mean in relation to valve actuators? - CORRECT
ANSWERS ✔✔
For a temperature of 1500F, what is a common gasket material? - CORRECT
ANSWERS ✔✔ceramic gaskets
Any person working near energized equipment during lockout tagout is
considered what type of
employee? - CORRECT ANSWERS ✔✔affected employee
