CALIBRATION & INSTRUMENT TECHNICIAN
PRACTICE Test Questions With Correct
Answers (Verified Answers) Plus Rationales
2026 Q&A | Instant Download Pdf
1. What is the primary purpose of calibration in instrumentation?
A. To increase signal strength
B. To ensure measurement accuracy against a standard
C. To reduce instrument size
D. To eliminate maintenance needs
Rationale: Calibration ensures that an instrument’s output
matches a known reference standard for accuracy.
2. Which device is commonly used as a standard reference for
pressure calibration?
A. Multimeter
B. Thermocouple
C. Dead weight tester
D. Oscilloscope
Rationale: A dead weight tester provides precise pressure
standards for calibration.
3. What does a 4–20 mA signal represent in industrial
instrumentation?
, A. Digital communication
B. Voltage range
C. Standard analog current signal for process control
D. Frequency output
Rationale: 4–20 mA is a widely used current loop for transmitting
analog signals.
4. Which instrument measures electrical resistance?
A. Voltmeter
B. Ammeter
C. Ohmmeter
D. Tachometer
Rationale: An ohmmeter is specifically designed to measure
resistance.
5. What is the function of a thermocouple?
A. Measure pressure
B. Measure flow
C. Measure temperature using voltage difference
D. Measure humidity
Rationale: Thermocouples generate a voltage proportional to
temperature difference.
6. Which unit is used for pressure measurement in SI system?
A. PSI
B. Pascal (Pa)
, C. Bar
D. Torr
Rationale: Pascal is the SI unit of pressure.
7. What is “zero calibration”?
A. Adjusting full scale
B. Setting instrument output to zero when input is zero
C. Increasing sensitivity
D. Replacing sensors
Rationale: Zero calibration ensures correct baseline measurement.
8. Which instrument is used to measure electrical current?
A. Voltmeter
B. Ammeter
C. Ohmmeter
D. Wattmeter
Rationale: Ammeters measure current flow in a circuit.
9. What does a pressure transmitter do?
A. Converts temperature to voltage
B. Converts pressure into an electrical signal
C. Measures resistance
D. Controls flow rate directly
Rationale: Pressure transmitters convert pressure into
standardized signals.
PRACTICE Test Questions With Correct
Answers (Verified Answers) Plus Rationales
2026 Q&A | Instant Download Pdf
1. What is the primary purpose of calibration in instrumentation?
A. To increase signal strength
B. To ensure measurement accuracy against a standard
C. To reduce instrument size
D. To eliminate maintenance needs
Rationale: Calibration ensures that an instrument’s output
matches a known reference standard for accuracy.
2. Which device is commonly used as a standard reference for
pressure calibration?
A. Multimeter
B. Thermocouple
C. Dead weight tester
D. Oscilloscope
Rationale: A dead weight tester provides precise pressure
standards for calibration.
3. What does a 4–20 mA signal represent in industrial
instrumentation?
, A. Digital communication
B. Voltage range
C. Standard analog current signal for process control
D. Frequency output
Rationale: 4–20 mA is a widely used current loop for transmitting
analog signals.
4. Which instrument measures electrical resistance?
A. Voltmeter
B. Ammeter
C. Ohmmeter
D. Tachometer
Rationale: An ohmmeter is specifically designed to measure
resistance.
5. What is the function of a thermocouple?
A. Measure pressure
B. Measure flow
C. Measure temperature using voltage difference
D. Measure humidity
Rationale: Thermocouples generate a voltage proportional to
temperature difference.
6. Which unit is used for pressure measurement in SI system?
A. PSI
B. Pascal (Pa)
, C. Bar
D. Torr
Rationale: Pascal is the SI unit of pressure.
7. What is “zero calibration”?
A. Adjusting full scale
B. Setting instrument output to zero when input is zero
C. Increasing sensitivity
D. Replacing sensors
Rationale: Zero calibration ensures correct baseline measurement.
8. Which instrument is used to measure electrical current?
A. Voltmeter
B. Ammeter
C. Ohmmeter
D. Wattmeter
Rationale: Ammeters measure current flow in a circuit.
9. What does a pressure transmitter do?
A. Converts temperature to voltage
B. Converts pressure into an electrical signal
C. Measures resistance
D. Controls flow rate directly
Rationale: Pressure transmitters convert pressure into
standardized signals.
