ISA CERTIFIED CONTROL SYSTEMS TECHNICIAN
(CCST) LEVEL II EXAMINATION COMPLETE
QUESTIONS AND DETAILED SOLUTIONS LATEST
UPDATE THIS YEAR JUST RELEASED
Tested Content Areas
Process Measurement and Instrumentation
o Calibration, accuracy, pressure, temperature, flow, and level measurement principles.
2. Control Loop Performance
o PID control, loop tuning, controller response, stability, and troubleshooting oscillations.
3. Final Control Elements
o Control valves, valve positioners, actuators, dampers, and variable frequency drives.
4. Industrial Communications
o HART, Foundation Fieldbus, Modbus, Profibus, Ethernet/IP, and digital communication
diagnostics.
5. Electrical Fundamentals
o AC/DC circuits, grounding, shielding, power supplies, signal isolation, and electrical
safety.
6. Control Systems and PLCs
o PLC operation, I/O modules, logic troubleshooting, interlocks, sequencing, and
distributed control systems.
7. Process Safety
o Safety Instrumented Systems (SIS), lockout/tagout, hazardous locations, permits, and
risk reduction.
8. Maintenance and Troubleshooting
o Root cause analysis, preventive maintenance, predictive maintenance, documentation,
and testing.
9. Documentation and Standards
o P&IDs, loop diagrams, instrument datasheets, ISA standards, and calibration records.
10. Installation Practices
Instrument installation, tubing, wiring, conduit, grounding, environmental protection, and
commissioning.
ISA CCST Level II Examination
,Questions 1–50
Question 1
A pressure transmitter calibrated over a 0–200 psi range consistently
indicates 150 psi while the reference standard measures 146 psi during
multiple verification checks. What should the technician conclude first?
A. The transmitter span is likely shifted upward.
B. The transmitter has excessive hysteresis.
C. The process pressure is unstable.
D. The reference standard is automatically incorrect.
Answer: A
Rationale: A consistent positive error throughout repeated measurements
generally indicates a calibration offset or span-related issue. The technician
should verify zero and span adjustments before suspecting hysteresis or
reference equipment.
Question 2
A control loop continues oscillating after replacing a properly functioning
control valve without modifying controller settings. Which explanation most
accurately describes the likely cause?
A. New valve dynamics differ from previous valve characteristics.
B. Pressure transmitter immediately requires recalibration.
C. Flow meter has permanently failed.
D. Process fluid composition automatically changed.
Answer: A
,Rationale: Different valve gain, deadband, or actuator response may
significantly alter loop dynamics. Controller tuning often requires
adjustment whenever final control element characteristics change.
Question 3
Which instrument characteristic most directly describes the ability of a
transmitter to repeatedly produce nearly identical outputs under identical
operating conditions?
A. Repeatability
B. Resolution
C. Sensitivity
D. Rangeability
Answer: A
Rationale: Repeatability measures how consistently an instrument
reproduces the same output for identical input conditions. High
repeatability is essential for reliable process control.
Question 4
While troubleshooting an erratic 4–20 mA signal, a technician discovers
electrical noise entering the cable from nearby variable frequency drive
wiring. Which corrective action is most appropriate?
A. Separate signal cables from power cables and improve shielding.
B. Increase transmitter span adjustment.
C. Replace the control valve.
D. Reduce process pressure.
Answer: A
, Rationale: Electromagnetic interference commonly affects analog signals.
Proper cable routing, shielding, and grounding reduce electrical noise and
improve measurement stability.
Question 5
A differential pressure flow transmitter suddenly reads zero while process
flow remains normal. Which component should be inspected first before
replacing the transmitter?
A. Impulse lines for blockage
B. Controller tuning constants
C. Valve positioner linkage
D. Operator interface software
Answer: A
Rationale: Plugged impulse lines frequently prevent pressure transmission
to the sensing element, producing inaccurate or zero readings despite
normal process conditions.
Question 6
When tuning a PID controller, increasing proportional gain excessively
without changing other parameters will most likely produce which operating
condition?
A. Increased oscillation and reduced stability
B. Slower controller response
C. Complete sensor failure
D. Improved measurement accuracy
Answer: A
(CCST) LEVEL II EXAMINATION COMPLETE
QUESTIONS AND DETAILED SOLUTIONS LATEST
UPDATE THIS YEAR JUST RELEASED
Tested Content Areas
Process Measurement and Instrumentation
o Calibration, accuracy, pressure, temperature, flow, and level measurement principles.
2. Control Loop Performance
o PID control, loop tuning, controller response, stability, and troubleshooting oscillations.
3. Final Control Elements
o Control valves, valve positioners, actuators, dampers, and variable frequency drives.
4. Industrial Communications
o HART, Foundation Fieldbus, Modbus, Profibus, Ethernet/IP, and digital communication
diagnostics.
5. Electrical Fundamentals
o AC/DC circuits, grounding, shielding, power supplies, signal isolation, and electrical
safety.
6. Control Systems and PLCs
o PLC operation, I/O modules, logic troubleshooting, interlocks, sequencing, and
distributed control systems.
7. Process Safety
o Safety Instrumented Systems (SIS), lockout/tagout, hazardous locations, permits, and
risk reduction.
8. Maintenance and Troubleshooting
o Root cause analysis, preventive maintenance, predictive maintenance, documentation,
and testing.
9. Documentation and Standards
o P&IDs, loop diagrams, instrument datasheets, ISA standards, and calibration records.
10. Installation Practices
Instrument installation, tubing, wiring, conduit, grounding, environmental protection, and
commissioning.
ISA CCST Level II Examination
,Questions 1–50
Question 1
A pressure transmitter calibrated over a 0–200 psi range consistently
indicates 150 psi while the reference standard measures 146 psi during
multiple verification checks. What should the technician conclude first?
A. The transmitter span is likely shifted upward.
B. The transmitter has excessive hysteresis.
C. The process pressure is unstable.
D. The reference standard is automatically incorrect.
Answer: A
Rationale: A consistent positive error throughout repeated measurements
generally indicates a calibration offset or span-related issue. The technician
should verify zero and span adjustments before suspecting hysteresis or
reference equipment.
Question 2
A control loop continues oscillating after replacing a properly functioning
control valve without modifying controller settings. Which explanation most
accurately describes the likely cause?
A. New valve dynamics differ from previous valve characteristics.
B. Pressure transmitter immediately requires recalibration.
C. Flow meter has permanently failed.
D. Process fluid composition automatically changed.
Answer: A
,Rationale: Different valve gain, deadband, or actuator response may
significantly alter loop dynamics. Controller tuning often requires
adjustment whenever final control element characteristics change.
Question 3
Which instrument characteristic most directly describes the ability of a
transmitter to repeatedly produce nearly identical outputs under identical
operating conditions?
A. Repeatability
B. Resolution
C. Sensitivity
D. Rangeability
Answer: A
Rationale: Repeatability measures how consistently an instrument
reproduces the same output for identical input conditions. High
repeatability is essential for reliable process control.
Question 4
While troubleshooting an erratic 4–20 mA signal, a technician discovers
electrical noise entering the cable from nearby variable frequency drive
wiring. Which corrective action is most appropriate?
A. Separate signal cables from power cables and improve shielding.
B. Increase transmitter span adjustment.
C. Replace the control valve.
D. Reduce process pressure.
Answer: A
, Rationale: Electromagnetic interference commonly affects analog signals.
Proper cable routing, shielding, and grounding reduce electrical noise and
improve measurement stability.
Question 5
A differential pressure flow transmitter suddenly reads zero while process
flow remains normal. Which component should be inspected first before
replacing the transmitter?
A. Impulse lines for blockage
B. Controller tuning constants
C. Valve positioner linkage
D. Operator interface software
Answer: A
Rationale: Plugged impulse lines frequently prevent pressure transmission
to the sensing element, producing inaccurate or zero readings despite
normal process conditions.
Question 6
When tuning a PID controller, increasing proportional gain excessively
without changing other parameters will most likely produce which operating
condition?
A. Increased oscillation and reduced stability
B. Slower controller response
C. Complete sensor failure
D. Improved measurement accuracy
Answer: A
