Instrument Technician Quiz

1. In a pressure transmitter, what does "rangeability" mean?

A) Size of the transmitter B) Accuracy of the transmitter C) The ratio of maximum to minimum measurable range D) Type of process connection

2. Which sensor is commonly used for measuring temperature?

A) Strain Gauge B) RTD C) Ultrasonic Sensor D) Proximity Switch

3. What does 4-20mA signal represent in instrumentation?

A) Hydraulic Power B) Mechanical Movement C) Standard Electrical Signal D) Data Communication

4. Why do we prefer 4 mA as the minimum signal instead of 0 mA?

A) To save power B) To detect a cable break C) To increase range D) To reduce heat

5. Which device is used to measure flow rate?

A) Thermocouple B) Orifice Plate C) Limit Switch D) Pressure Gauge

6. What is the purpose of a diaphragm seal in a pressure transmitter?

A) Enhance signal B) Avoid vibration C) Protect against corrosive media D) Increase flow

7. In control valves, what does "fail safe" mean?

A) Valve operates faster B) Valve will go to a safe position on failure C) Valve stops working D) Valve runs continuously

8. What is the output of a proximity sensor?

A) Pneumatic B) Digital C) Analog D) Hydraulic

9. Which type of cable is commonly used for RTD?

A) Coaxial Cable B) Fiber Optic Cable C) 3-Core Shielded Cable D) Power Cable

10. What is the function of a SMART transmitter?

A) Only sends analog signals B) Only measures flow C) Converts digital to analog D) Provides digital communication and self-diagnosis

11. What device converts a signal into a pneumatic output?

A) Transducer B) Thermocouple C) Vortex Meter D) Data Logger

12. What is the color code of a positive lead in a standard thermocouple?

A) Red B) Yellow C) Black D) Green

13. What unit is commonly used to measure pressure?

A) Lux B) Pascal C) Ohm D) dB

14. What happens if a pressure transmitter impulse line is blocked?

A) Over-range reading B) Normal operation C) Zero reading D) Alarm silenced

15. In loop checking, which tool is mainly used?

A) Megger B) Multimeter C) HART Communicator D) Vibration Meter

16. What is the main function of a solenoid valve?

A) Measure pressure B) Act as a flow controller C) Detect temperature D) Calculate speed

17. Which of the following is a passive instrument?

A) Pressure Gauge B) Control Valve C) Solenoid Valve D) Motorized Valve

18. Why is shielding necessary in instrumentation cables?

A) Reduce power loss B) Protect from mechanical damage C) Prevent signal interference D) Increase signal strength

19. What is calibration?

A) Changing the device B) Replacement of parts C) Comparing with a standard and adjusting D) Painting the instrument

20. Which of the following is a flow measuring instrument?

A) Pitot Tube B) RTD C) Thermocouple D) Vibration Sensor

21. What does a "HART Protocol" mean?

A) Hydraulic control B) Mechanical adjustment C) Digital communication over analog signal D) Wireless data transmission

22. Which of these is used to measure level in a tank?

A) RTD B) Capacitance Transmitter C) Thermowell D) Flow Meter

23. In an open tank level measurement, which pressure is used?

A) Absolute Pressure B) Differential Pressure C) Atmospheric Pressure D) Negative Pressure

24. Which parameter is NOT measured by a DCS system?

A) Flow B) Pressure C) Temperature D) Engine RPM

25. What is the purpose of a relay in an instrument loop?

A) Store data B) Convert signal C) Act as a switch D) Measure resistance

Instrument Technician Quiz

🌟 Job Ready - 100% Scorers