ISA CERTIFIED CONTROL SYSTEMS TECHNICIAN (CCST)
LEVEL II 350 PRACTICE EXAM QUESTIONS WITH ANSWERS
AND RATIONALES
DOMAIN I: CALIBRATION (Questions 1–85)
1. Which calibration parameter describes the difference between the
measured value when the input is increasing versus decreasing?
A) Linearity
B) Hysteresis
C) Repeatability
D) Sensitivity
Correct Answer: B
Rationale: Hysteresis is the maximum difference in output for a given input
when the input is approached from opposite directions (increasing versus
decreasing).
2. A NISTtraceable dry block is primarily used for calibrating which type of
instrument?
A) Pressure transducers
,B) Temperature transmitters
C) Flow meters
D) Level gauges
Correct Answer: B
Rationale: Dry blocks provide stable temperature references for calibrating
temperature devices such as RTDs, thermocouples, and temperature
transmitters.
3. When documenting calibration, "AsFound" data refers to:
A) Values after adjustment
B) Manufacturerspecified limits
C) Measurements before any correction
D) Values recorded in the calibration certificate
Correct Answer: C
Rationale: "AsFound" data is the raw measurement taken prior to any
adjustments or corrections during calibration.
4. What instrument is used to calibrate a pressure transmitter?
,A) Multimeter
B) Clamp meter
C) Deadweight tester
D) Oscilloscope
Correct Answer: C
Rationale: A deadweight tester provides precise, known pressure references
for calibrating pressure transmitters by applying weights to a pistoncylinder
assembly.
5. When performing a zero adjustment on a 4–20 mA pressure transmitter,
which condition must be met?
A) The transmitter must be at full scale pressure
B) The process pressure must be at its minimum measurable value
C) The temperature must be at the highest rated value
D) The output must be set to 12 mA
Correct Answer: B
Rationale: Zero adjustment aligns the 4 mA output with the minimum process
pressure, typically atmospheric or a defined low point.
, 6. A transmitter is calibrated for +40 to +140 inches of water for a level
application. This is a ________ zero range.
A) Suppressed
B) Elevated
C) Nominal
D) Biased
Correct Answer: A
Rationale: A suppressed zero range occurs when the lower range value (LRV)
is above zero—in this case, +40 inches of water. The zero is "suppressed"
upward.
7. What is the purpose of a fivepoint calibration check?
A) To verify calibration at 0%, 25%, 50%, 75%, and 100% of span
B) To check calibration five times in a row
C) To calibrate five different instruments simultaneously
D) To verify calibration at five different temperatures
Correct Answer: A
Rationale: A fivepoint calibration check verifies instrument accuracy at 0%,
25%, 50%, 75%, and 100% of the instrument's calibrated span to ensure
linearity throughout the range.
LEVEL II 350 PRACTICE EXAM QUESTIONS WITH ANSWERS
AND RATIONALES
DOMAIN I: CALIBRATION (Questions 1–85)
1. Which calibration parameter describes the difference between the
measured value when the input is increasing versus decreasing?
A) Linearity
B) Hysteresis
C) Repeatability
D) Sensitivity
Correct Answer: B
Rationale: Hysteresis is the maximum difference in output for a given input
when the input is approached from opposite directions (increasing versus
decreasing).
2. A NISTtraceable dry block is primarily used for calibrating which type of
instrument?
A) Pressure transducers
,B) Temperature transmitters
C) Flow meters
D) Level gauges
Correct Answer: B
Rationale: Dry blocks provide stable temperature references for calibrating
temperature devices such as RTDs, thermocouples, and temperature
transmitters.
3. When documenting calibration, "AsFound" data refers to:
A) Values after adjustment
B) Manufacturerspecified limits
C) Measurements before any correction
D) Values recorded in the calibration certificate
Correct Answer: C
Rationale: "AsFound" data is the raw measurement taken prior to any
adjustments or corrections during calibration.
4. What instrument is used to calibrate a pressure transmitter?
,A) Multimeter
B) Clamp meter
C) Deadweight tester
D) Oscilloscope
Correct Answer: C
Rationale: A deadweight tester provides precise, known pressure references
for calibrating pressure transmitters by applying weights to a pistoncylinder
assembly.
5. When performing a zero adjustment on a 4–20 mA pressure transmitter,
which condition must be met?
A) The transmitter must be at full scale pressure
B) The process pressure must be at its minimum measurable value
C) The temperature must be at the highest rated value
D) The output must be set to 12 mA
Correct Answer: B
Rationale: Zero adjustment aligns the 4 mA output with the minimum process
pressure, typically atmospheric or a defined low point.
, 6. A transmitter is calibrated for +40 to +140 inches of water for a level
application. This is a ________ zero range.
A) Suppressed
B) Elevated
C) Nominal
D) Biased
Correct Answer: A
Rationale: A suppressed zero range occurs when the lower range value (LRV)
is above zero—in this case, +40 inches of water. The zero is "suppressed"
upward.
7. What is the purpose of a fivepoint calibration check?
A) To verify calibration at 0%, 25%, 50%, 75%, and 100% of span
B) To check calibration five times in a row
C) To calibrate five different instruments simultaneously
D) To verify calibration at five different temperatures
Correct Answer: A
Rationale: A fivepoint calibration check verifies instrument accuracy at 0%,
25%, 50%, 75%, and 100% of the instrument's calibrated span to ensure
linearity throughout the range.
