Instrumentation Technician Level I
Exam Practice Questions And Correct
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1.Which instrument is primarily used to measure pressure in an industrial
process?
A. Thermocouple
B. Pressure gauge
C. Rotameter
D. Hygrometer
Rationale: A pressure gauge is specifically designed to measure the pressure
of gases or liquids in a process system. Thermocouples measure
temperature, rotameters measure flow, and hygrometers measure humidity.
2. Which SI unit is used to measure pressure?
A. Newton
B. Pascal
C. Joule
D. Watt
Rationale: The pascal (Pa) is the SI unit of pressure and is defined as one
newton per square meter.
3. A thermocouple measures temperature based on which principle?
A. Piezoelectric effect
, B. Seebeck effect
C. Hall effect
D. Doppler effect
Rationale: Thermocouples operate using the Seebeck effect, where a voltage
is generated due to a temperature difference between two dissimilar metals.
4. Which device is commonly used to measure liquid flow in a closed
pipeline?
A. Barometer
B. Tachometer
C. Flowmeter
D. Lux meter
Rationale: A flowmeter measures the rate of fluid flow through a pipe,
making it essential in process industries.
5. What is the primary function of a transmitter?
A. Display process values
B. Record process values
C. Convert a measured variable into a standardized signal
D. Control a valve manually
Rationale: A transmitter senses a process variable and converts it into a
standard signal such as 4–20 mA for transmission to a control system.
6. The standard analog current signal used in industrial instrumentation
is:
A. 0–10 mA
B. 4–20 mA
C. 10–50 mA
D. 1–5 mA
Rationale: The 4–20 mA current loop is the most widely used industrial
standard because it is reliable and allows detection of circuit failures.
, 7. Which instrument measures the level of liquid inside a storage tank?
A. Pressure switch
B. Level transmitter
C. Temperature sensor
D. Flow switch
Rationale: A level transmitter continuously measures the liquid level and
sends the information to monitoring or control systems.
8. A digital multimeter can measure all of the following EXCEPT:
A. Voltage
B. Resistance
C. Current
D. Flow rate
Rationale: A digital multimeter measures electrical quantities such as
voltage, current, and resistance but cannot directly measure fluid flow.
9. Which instrument converts pneumatic pressure into electrical output?
A. I/P converter
B. P/I converter
C. Positioner
D. Rotameter
Rationale: A P/I converter converts pneumatic pressure into an electrical
signal, whereas an I/P converter performs the opposite function.
10. Which process variable is measured in degrees Celsius?
A. Pressure
B. Flow
C. Temperature
D. Level
Rationale: Temperature is commonly expressed in degrees Celsius or
Fahrenheit in industrial processes.
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationale 2026 Q&A| Instant Download
1.Which instrument is primarily used to measure pressure in an industrial
process?
A. Thermocouple
B. Pressure gauge
C. Rotameter
D. Hygrometer
Rationale: A pressure gauge is specifically designed to measure the pressure
of gases or liquids in a process system. Thermocouples measure
temperature, rotameters measure flow, and hygrometers measure humidity.
2. Which SI unit is used to measure pressure?
A. Newton
B. Pascal
C. Joule
D. Watt
Rationale: The pascal (Pa) is the SI unit of pressure and is defined as one
newton per square meter.
3. A thermocouple measures temperature based on which principle?
A. Piezoelectric effect
, B. Seebeck effect
C. Hall effect
D. Doppler effect
Rationale: Thermocouples operate using the Seebeck effect, where a voltage
is generated due to a temperature difference between two dissimilar metals.
4. Which device is commonly used to measure liquid flow in a closed
pipeline?
A. Barometer
B. Tachometer
C. Flowmeter
D. Lux meter
Rationale: A flowmeter measures the rate of fluid flow through a pipe,
making it essential in process industries.
5. What is the primary function of a transmitter?
A. Display process values
B. Record process values
C. Convert a measured variable into a standardized signal
D. Control a valve manually
Rationale: A transmitter senses a process variable and converts it into a
standard signal such as 4–20 mA for transmission to a control system.
6. The standard analog current signal used in industrial instrumentation
is:
A. 0–10 mA
B. 4–20 mA
C. 10–50 mA
D. 1–5 mA
Rationale: The 4–20 mA current loop is the most widely used industrial
standard because it is reliable and allows detection of circuit failures.
, 7. Which instrument measures the level of liquid inside a storage tank?
A. Pressure switch
B. Level transmitter
C. Temperature sensor
D. Flow switch
Rationale: A level transmitter continuously measures the liquid level and
sends the information to monitoring or control systems.
8. A digital multimeter can measure all of the following EXCEPT:
A. Voltage
B. Resistance
C. Current
D. Flow rate
Rationale: A digital multimeter measures electrical quantities such as
voltage, current, and resistance but cannot directly measure fluid flow.
9. Which instrument converts pneumatic pressure into electrical output?
A. I/P converter
B. P/I converter
C. Positioner
D. Rotameter
Rationale: A P/I converter converts pneumatic pressure into an electrical
signal, whereas an I/P converter performs the opposite function.
10. Which process variable is measured in degrees Celsius?
A. Pressure
B. Flow
C. Temperature
D. Level
Rationale: Temperature is commonly expressed in degrees Celsius or
Fahrenheit in industrial processes.
