CCST Level II Practice Exam Questions

ISA Certified Control Systems Technician (CCST) Level II Practice Exam Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

Subjects Covered: Process Measurement, Control Systems, Final Control

Elements, Digital Systems, and Troubleshooting

• A 4–20 mA signal represents a process range of 0–100 psi. What

pressure corresponds to a 12 mA signal?

• 25 psi
• 50 psi
• 60 psi
• 75 psi

Rationale: 12 mA is halfway between 4 and 20 mA, so it represents

50% of the range, which is 50 psi. 1 / 4

• What is the purpose of a transmitter in a control loop?

a) To receive data from a controller

b) To control the final control element

c) To convert a process variable into a standardized signal

d) To store historical process data

Rationale: A transmitter measures a process variable and sends a

proportional signal (e.g., 4–20 mA) to a controller.

3. A thermocouple produces a voltage signal that depends on:

a) Resistance changes

b) Pressure differences

c) Temperature differences between junctions

d) Flow rate

Rationale: Thermocouples generate a voltage proportional to the

temperature difference between the hot and cold junctions.

• What does PID stand for in a controller?

a) Process, Instrument, Display

b) Proportional, Integral, Derivative

c) Pressure, Indicator, Display

d) Position, Input, Delay

Rationale: PID represents the three modes of control used in

feedback loops: proportional, integral, and derivative.

• What is the main function of a control valve positioner?

a) To limit valve movement 2 / 4

b) To amplify pneumatic signals

c) To ensure valve position corresponds to the control signal

d) To measure valve stem position

Rationale: A positioner adjusts air pressure to ensure the valve stem

accurately follows the controller signal.

• In a current loop, what happens if the loop resistance increases?

a) The signal current increases

b) The signal current decreases

c) The voltage at the transmitter increases

d) The loop becomes unstable

Rationale: Increased resistance causes a voltage drop, reducing loop

current if voltage supply is limited.

• What type of control action eliminates steady-state error?

a) Proportional

b) Integral

c) Derivative

d) Feedforward

Rationale: Integral action continuously sums the error over time,

eliminating offset.

• What device converts a pneumatic signal to an electrical signal?

a) I/P transducer

b) P/I transducer

c) Controller 3 / 4

d) Positioner

Rationale: A P/I transducer converts pneumatic (pressure) signals

into electrical signals.

• A flow transmitter calibrated 0–100 GPM gives 12 mA output. What is

the flow rate?

• 25 GPM
• 50 GPM
• 75 GPM
• 100 GPM

Rationale: 12 mA is 50% of span; 50% of 100 GPM equals 50 GPM.

• What is the purpose of a 250-ohm resistor in a 4–20 mA loop?

a) To reduce loop voltage

b) To convert current to voltage for monitoring (1–5 VDC)

c) To increase loop current

d) To isolate loop grounds

Rationale: A 250-ohm resistor converts 4–20 mA to 1–5 V for input to

devices requiring voltage signals.

• What is the output of an RTD proportional to?

a) Resistance

b) Voltage

c) Current

d) Temperature difference

• / 4