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INSTRUMENTATION NCCER STUDY GUIDE EXAM QUESTIONS AND ANSWERS
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INSTRUMENTATION NCCER STUDY GUIDE EXAM QUESTIONS AND ANSWERS
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INSTRUMENTATION NCCER STUDYGUIDE EXAM QUESTIONS AND
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? - 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
What does it mean to say that a controller is direct acting? - Answer-increases its output
signal when the measure medium increases
How does fail open relate to air to close? - Answer-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? - Answer-
For a temperature of 1500F, what is a common gasket material? - Answer-ceramic
gaskets
Any person working near energized equipment during lockout tagout is considered what
type of
employee? - Answer-affected employee
What does P&ID's provide? - Answer-illustrates the operational layout of a system
including its piping valves, instrumentation and flow of a product
When a transducer is used on a Pneumatic control valve that is set up at fail close, a
signal of 4mA will result in a pressure of 3 PSI which will close the valve? True or False
- Answer-true
What does a venturi tube measure? - Answer-flow rate
If the proportional band of a controller is adjusted to the minimum possible value, the
controller
is likely to act as an on/off? True or False - Answer-True
The standard of which an organization identifies the characteristics of metals used for a
particular application. - Answer-ASTM International American Society for testing
materials
When deburring tubing what should be avoided? - Answer-burrs lips can brake loose
causing chip silvers to enter the tubing system
In a nonlinear power supply the DC output voltage is regulated by which component? -
Answer-rectify
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