NACE CP2 COMPREHENSIVE STUDY
GUIDE 2026 FULL QUESTIONS AND
SOLUTIONS GRADED A+
◍ This rectifier uses a transformer that is a much smaller, uses a high
frequency, ferrite-core transformerA) Silicon -Controlled RectifiersB) Pulse
RectifierC) Thermoelectric rectifierD) Switch-mode rectifiers.
Answer: d
◍ True or False (t or f)In regards to rectifiersTo improve efficiency and reduce
ripple, manufacturers normally add filters to theoutput terminals.
Answer: t
◍ Rather than adjusting theoutput voltage level using a large, laminated steel
core transformer, ______ control the DC output voltage level by producing
a series ofhigh frequency (typically 50 to 500 k Hz) DC pulses and adjusting
the timing of DC pulses to produce the required output DC voltage level.A)
Silicon -Controlled RectifiersB) Pulse RectifierC) Thermoelectric
rectifierD) Switch-mode rectifiersE) Constant Voltage rectifier.
Answer: d
◍ In regards to a Standard Transformer Rectifier, but the following in order
from left to right: RectifierAC InputFilter (if used)Low Frequency
Transformer w/TAPsDC Output.
Answer: nan
◍ In regards to a Switching Mode Rectifier, put the following in order from
left to rightDC OutputPrimary FilterTransformerSecondary FilterSecondary
RectifierSensing/Switching CircuitPrimary RectifierAC InputSolid State
Switch.
Answer: nan
,◍ In regards to a switching mode rectifier:The DC pulses are fed through a
high frequency ____ to isolate the output.A) transformerB) primary filterC)
secondary rectifierD) solid state switch.
Answer: a
◍ In regards to a switching mode rectifier:The _______ next converts the DC
to high frequency DC pulsesA) transformerB) primary filterC) secondary
rectifierD) solid state switch.
Answer: d
◍ In regards to a switching mode rectifier:The _______ circuit provides
feedback control to the _______ to control the "on" and "off" timing (pulse
width) of the switchA) solid state switch, sensing / switch controlB)
secondary rectifier, primary filterC) solid state switch, secondary rectifierD)
sensing/switch control, solid state switch.
Answer: d
◍ The primary advantages of a switching-mode rectifier over a standard
transformer/ rectifier areI higher reliability due to number of componentsII
Small size and weightIII Prone to higher rippleIV High efficiency at low
rated outputA) only IB) I, II, IVC) II, IVD) I, II, IIIE) I, II, III, IV.
Answer: c
◍ In this type of rectifier, the output voltage is adjusted by changing the
secondary transformer tapsA) Silicon -Controlled RectifiersB) Pulse
RectifierC) Thermoelectric rectifierD) Switch-mode rectifiersE) Constant
Voltage rectifierF) Constant Current rectifier.
Answer: e
◍ True or false (t or f)In a switching mode rectifier:Repair of individual
modules is easy and practical.
Answer: fit is NOT practical
◍ Adjustment of the output is acombination of varying the frequency and
adjusting capacitors that in turn setthe duty cycle with this type of
rectifierA) Silicon -Controlled B) PulseC) Thermoelectric D) Switch-mode.
, Answer: b
◍ The primary use of pulse rectifiers is on _____A) foreign linesB)
mountainous areasC) well casingsD) anode beds.
Answer: c
◍ If the external resistance changes, this rectifier output voltage is increased or
decreased to maintain the preset value and an external reference electrode is
not used in this type of rectifierA) Silicon -Controlled RectifiersB) Constant
Current rectifierC) Thermoelectric rectifierD) Switch-mode rectifiersE)
Constant Voltage rectifierF) Pulse Rectifier.
Answer: b
◍ A constant current rectifier can also be achieved using ____-controlled
diodesA) seleniumB) silicon.
Answer: b
◍ This ____ uses an external structure-to-electrolyte potential and compares it
to the preset value. If the structure-to-electrolyte potential changes from
thepreset value, the rectifier current either increases or decreases current
output to bring the potential back to its preset valueA) Silicon -Controlled
RectifiersB) Constant Current rectifierC) Thermoelectric rectifierD)
Switch-mode rectifiersE) Constant Potential rectifierF) Pulse Rectifier.
Answer: e
◍ These rectifiers should be manufacturedwith a current limiting circuit in the
event of a loss of reference cell input signalA) Silicon -Controlled
RectifiersB) Constant Current rectifierC) Thermoelectric rectifierD)
Switch-mode rectifiersE) Constant Potential rectifierF) Pulse Rectifier.
Answer: e
◍ _____can be supplied with the rectifier to allow cycling the unit on and off
for testing purposesA) FiltersB) Surge protectionC) InterruptersD) Remote
MonitoringE) Warning Devices and Signal Lights.
Answer: c
◍ ___ is used to protect the rectifier from lightningA) FiltersB) Surge
, protectionC) InterruptersD) Remote MonitoringE) Warning Devices and
Signal Lights.
Answer: b
◍ Efficiency _____ are used to decrease the AC ripple of the DC output,
whichdecreases the operating cost of the rectifierA) FiltersB) Surge
protectionC) InterruptersD) Remote MonitoringE) Warning Devices and
Signal Lights.
Answer: a
◍ ____ are used to alert personnel to operating malfunctions of the unitA)
FiltersB) Surge protectionC) InterruptersD) Remote MonitoringE) Warning
Devices and Signal Lights.
Answer: e
◍ True or False (t or f)The rectifier MUST be turned off at the breaker before
any taps are changed, and changes should be made one at a time.
Answer: t
◍ The _____ rectifiers are usually adjusted by changingthe transformer tap
settingsA) Silicon -Controlled B) Constant CurrentC) Thermoelectric D)
Switch-mode E) Constant Voltage F) Pulse.
Answer: e
◍ In regards to rectifiers: The general procedure to change taps is to turn off
rectifier, increase the ____ one settingmaking certain that the connections
are tight, and turn on the rectifier checking ____output voltageA) Coarse
tap, DCB) Fine tap, DCC) Coarse tap, ACD) Fine tap, AC.
Answer: b
◍ In regards to rectifiers:When the Fine taps have reached the _____, lowerit
to the first setting and increase the ____ one setting.A) minimum, fine tapB)
maximum, coarse tapC) maximum, fine tapD) minimum, coarse tap.
Answer: b
◍ Potential control and constant current rectifiers are controlled using
a______adjustment found on the controlling circuit boardA) multimeterB)
GUIDE 2026 FULL QUESTIONS AND
SOLUTIONS GRADED A+
◍ This rectifier uses a transformer that is a much smaller, uses a high
frequency, ferrite-core transformerA) Silicon -Controlled RectifiersB) Pulse
RectifierC) Thermoelectric rectifierD) Switch-mode rectifiers.
Answer: d
◍ True or False (t or f)In regards to rectifiersTo improve efficiency and reduce
ripple, manufacturers normally add filters to theoutput terminals.
Answer: t
◍ Rather than adjusting theoutput voltage level using a large, laminated steel
core transformer, ______ control the DC output voltage level by producing
a series ofhigh frequency (typically 50 to 500 k Hz) DC pulses and adjusting
the timing of DC pulses to produce the required output DC voltage level.A)
Silicon -Controlled RectifiersB) Pulse RectifierC) Thermoelectric
rectifierD) Switch-mode rectifiersE) Constant Voltage rectifier.
Answer: d
◍ In regards to a Standard Transformer Rectifier, but the following in order
from left to right: RectifierAC InputFilter (if used)Low Frequency
Transformer w/TAPsDC Output.
Answer: nan
◍ In regards to a Switching Mode Rectifier, put the following in order from
left to rightDC OutputPrimary FilterTransformerSecondary FilterSecondary
RectifierSensing/Switching CircuitPrimary RectifierAC InputSolid State
Switch.
Answer: nan
,◍ In regards to a switching mode rectifier:The DC pulses are fed through a
high frequency ____ to isolate the output.A) transformerB) primary filterC)
secondary rectifierD) solid state switch.
Answer: a
◍ In regards to a switching mode rectifier:The _______ next converts the DC
to high frequency DC pulsesA) transformerB) primary filterC) secondary
rectifierD) solid state switch.
Answer: d
◍ In regards to a switching mode rectifier:The _______ circuit provides
feedback control to the _______ to control the "on" and "off" timing (pulse
width) of the switchA) solid state switch, sensing / switch controlB)
secondary rectifier, primary filterC) solid state switch, secondary rectifierD)
sensing/switch control, solid state switch.
Answer: d
◍ The primary advantages of a switching-mode rectifier over a standard
transformer/ rectifier areI higher reliability due to number of componentsII
Small size and weightIII Prone to higher rippleIV High efficiency at low
rated outputA) only IB) I, II, IVC) II, IVD) I, II, IIIE) I, II, III, IV.
Answer: c
◍ In this type of rectifier, the output voltage is adjusted by changing the
secondary transformer tapsA) Silicon -Controlled RectifiersB) Pulse
RectifierC) Thermoelectric rectifierD) Switch-mode rectifiersE) Constant
Voltage rectifierF) Constant Current rectifier.
Answer: e
◍ True or false (t or f)In a switching mode rectifier:Repair of individual
modules is easy and practical.
Answer: fit is NOT practical
◍ Adjustment of the output is acombination of varying the frequency and
adjusting capacitors that in turn setthe duty cycle with this type of
rectifierA) Silicon -Controlled B) PulseC) Thermoelectric D) Switch-mode.
, Answer: b
◍ The primary use of pulse rectifiers is on _____A) foreign linesB)
mountainous areasC) well casingsD) anode beds.
Answer: c
◍ If the external resistance changes, this rectifier output voltage is increased or
decreased to maintain the preset value and an external reference electrode is
not used in this type of rectifierA) Silicon -Controlled RectifiersB) Constant
Current rectifierC) Thermoelectric rectifierD) Switch-mode rectifiersE)
Constant Voltage rectifierF) Pulse Rectifier.
Answer: b
◍ A constant current rectifier can also be achieved using ____-controlled
diodesA) seleniumB) silicon.
Answer: b
◍ This ____ uses an external structure-to-electrolyte potential and compares it
to the preset value. If the structure-to-electrolyte potential changes from
thepreset value, the rectifier current either increases or decreases current
output to bring the potential back to its preset valueA) Silicon -Controlled
RectifiersB) Constant Current rectifierC) Thermoelectric rectifierD)
Switch-mode rectifiersE) Constant Potential rectifierF) Pulse Rectifier.
Answer: e
◍ These rectifiers should be manufacturedwith a current limiting circuit in the
event of a loss of reference cell input signalA) Silicon -Controlled
RectifiersB) Constant Current rectifierC) Thermoelectric rectifierD)
Switch-mode rectifiersE) Constant Potential rectifierF) Pulse Rectifier.
Answer: e
◍ _____can be supplied with the rectifier to allow cycling the unit on and off
for testing purposesA) FiltersB) Surge protectionC) InterruptersD) Remote
MonitoringE) Warning Devices and Signal Lights.
Answer: c
◍ ___ is used to protect the rectifier from lightningA) FiltersB) Surge
, protectionC) InterruptersD) Remote MonitoringE) Warning Devices and
Signal Lights.
Answer: b
◍ Efficiency _____ are used to decrease the AC ripple of the DC output,
whichdecreases the operating cost of the rectifierA) FiltersB) Surge
protectionC) InterruptersD) Remote MonitoringE) Warning Devices and
Signal Lights.
Answer: a
◍ ____ are used to alert personnel to operating malfunctions of the unitA)
FiltersB) Surge protectionC) InterruptersD) Remote MonitoringE) Warning
Devices and Signal Lights.
Answer: e
◍ True or False (t or f)The rectifier MUST be turned off at the breaker before
any taps are changed, and changes should be made one at a time.
Answer: t
◍ The _____ rectifiers are usually adjusted by changingthe transformer tap
settingsA) Silicon -Controlled B) Constant CurrentC) Thermoelectric D)
Switch-mode E) Constant Voltage F) Pulse.
Answer: e
◍ In regards to rectifiers: The general procedure to change taps is to turn off
rectifier, increase the ____ one settingmaking certain that the connections
are tight, and turn on the rectifier checking ____output voltageA) Coarse
tap, DCB) Fine tap, DCC) Coarse tap, ACD) Fine tap, AC.
Answer: b
◍ In regards to rectifiers:When the Fine taps have reached the _____, lowerit
to the first setting and increase the ____ one setting.A) minimum, fine tapB)
maximum, coarse tapC) maximum, fine tapD) minimum, coarse tap.
Answer: b
◍ Potential control and constant current rectifiers are controlled using
a______adjustment found on the controlling circuit boardA) multimeterB)
