NCCER Review Questions And Answers
The density of a liquid affects the displacer's:
length
height
buoyancy - ANS-buoyancy
What mode MUST the controller be in before any changes are made to the process variable?
automatic
manual
shut-down
power off - ANS-manual
Bills of material...
When bench calibrating a temperature RTD transmitter, the instrument technician should apply:
hot air pressure
cold air pressure
,resistance
voltage - ANS-✔✔resistance
Before working on a de-energized circuit containing a capacitor, what must be done?
discharge the capacitor
re-energize the circuit
defibrillate the system
remove the lockouts - ANS-✔✔discharge the capacitor
The MINIMUM value of the measured process range is considered to be:
upper measured value
3 psi and 4 ma
zero input value
span value - ANS-✔✔3 psi and 4 ma
A solenoid valve is often used to
regulate temperature
direct airflow that opens or closes an air operated valve
regulate the amp that is used to open/close control valve
control the voltage that is used to open/close contacts - ANS-✔✔direct airflow that opens or closes an
air-operated valve
Viscosity is analyzed in all of the following ways EXCEPT:
,the falling all method
the viscositron method
the rotating disc method
the capillary method - ANS-✔✔the viscositron method
The process parameter that is selected for control is called the:
process rate
controlled energy
process setpoint
controlled variable - ANS-✔✔controlled variable
Optimal gain is the MAXIMUM allowable value of gain in which the system is:
stable
oscillating
at its highest amplitude
NOT responding - ANS-✔✔stable
Carbon dioxide is produced commercially:
by extraction from the atmosphere
as a byproduct of manufacturing
by extraction from ocean water
, through chemical bonding - ANS-✔✔as a byproduct of manufacturing
The MOST reliable relay is a/an:
EMR
pneumatic
SSR
LED - ANS-✔✔SSR
In modulating control, the first step is to compute the error between controlled variable and setpoint.
The second step is to produce a(n):
output signal
modulating mode
feedback set point
process feedback - ANS-✔✔output signal
A dashpot timer relay:
is well suited for fast on-off cycles
is a type of pneumatic relay
has NO moving parts
requires a long reset time - ANS-✔✔is a type of pneumatic relay
A photosensor is a:
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