Instrumentation and Control MCQs

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1. Which instrument is used to measure temperature in industrial applications?
(A) Tachometer
(B) Thermocouple
(C) Manometer
(D) Barometer

2. What does the acronym PLC stand for in the context of industrial control systems?
(A) Process Logic Controller
(B) Process Level Controller
(C) Programmable Level Counter
(D) Programmable Logic Controller

3. Which type of sensor converts physical quantities into electrical signals?
(A) Transducer
(B) Actuator
(C) Encoder
(D) Relay

4. What is the function of a pressure transducer?
(A) Converts pressure into mechanical motion
(B) Measures flow rate
(C) Converts pressure into electrical signals
(D) Measures temperature

5. Which instrument measures the rotational speed of a shaft?
(A) Tachometer
(B) Thermocouple
(C) Pyrometer
(D) Barometer

6. What does PID stand for in the context of control systems?
(A) Pulse-Increment-Damping
(B) Pressure-Indicator-Delay
(C) Process-Input-Device
(D) Proportional-Integral-Derivative

7. Which instrument is used to measure the level of liquids in tanks?
(A) Flow meter
(B) Thermocouple
(C) Level sensor
(D) Strain gauge

8. What is the purpose of a flow meter?
(A) Measures electrical current
(B) Measures temperature
(C) Measures fluid flow rate
(D) Measures pressure

9. Which type of control system adjusts the output based on both the current error and the accumulated past errors?
(A) Proportional control
(B) Integral control
(C) Derivative control
(D) PID control

10. What does SCADA stand for in the context of industrial automation?
(A) System Control and Digital Automation
(B) Sensor Control and Data Analysis
(C) Supervisory Control and Data Acquisition
(D) Signal Calculation and Data Acquisition

11. Which instrument measures the pH level of a solution?
(A) Barometer
(B) pH meter
(C) Hygrometer
(D) Anemometer

12. What is the function of a strain gauge?
(A) Measures fluid pressure
(B) Measures flow rate
(C) Measures temperature
(D) Measures displacement or strain

13. Which type of control system adjusts the output based on the current error signal only?
(A) PID control
(B) Integral control
(C) Derivative control
(D) Proportional control

14. What does RTD stand for in the context of temperature measurement?
(A) Real-Time Data
(B) Remote Transmission Device
(C) Relative Time Delay
(D) Resistance Temperature Detector

15. Which instrument measures the humidity in the air?
(A) Thermocouple
(B) Tachometer
(C) Hygrometer
(D) Manometer

16. What is the purpose of an actuator in a control system?
(A) Converts electrical signals into mechanical motion
(B) Measures physical quantities
(C) Converts mechanical motion into electrical signals
(D) Stores electrical energy

17. Which instrument measures the pressure of gases or liquids?
(A) Thermocouple
(B) Tachometer
(C) Manometer
(D) Hygrometer

18. What does DCS stand for in the context of industrial control systems?
(A) Direct Current System
(B) Digital Control System
(C) Distributed Control System
(D) Dynamic Control System

19. Which type of control system is primarily used for maintaining a constant temperature in an industrial furnace?
(A) Proportional control
(B) Integral control
(C) PID control
(D) Derivative control

20. What is the function of an encoder in a control system?
(A) Measures fluid flow rate
(B) Converts pressure into electrical signals
(C) Converts mechanical motion into electrical signals
(D) Measures rotational position or velocity

21. Which instrument measures the speed of air movement?
(A) Pyrometer
(B) Tachometer
(C) Anemometer
(D) Hygrometer

22. What is the primary function of a control valve in an industrial process?
(A) Regulates fluid flow
(B) Measures flow rate
(C) Measures temperature
(D) Controls pressure

23. Which type of control system reduces the system’s sensitivity to disturbances and noise?
(A) Proportional control
(B) Integral control
(C) PID control
(D) Derivative control

24. What does HMI stand for in the context of industrial automation?
(A) High-Memory Integration
(B) Human-Machine Interface
(C) Hydraulic Machine Interface
(D) Hardware-Maintenance Integration

25. Which instrument measures the speed of rotation of a motor or turbine?
(A) Tachometer
(B) Thermocouple
(C) Anemometer
(D) Barometer

26. What is the function of a solenoid valve in a control system?
(A) Measures fluid pressure
(B) Regulates electrical current
(C) Measures temperature
(D) Controls fluid flow with an electrically operated valve

27. Which instrument measures the intensity of light in a specific area?
(A) Photometer
(B) Hygrometer
(C) Tachometer
(D) Manometer

28. What does SCADA stand for in the context of industrial automation?
(A) Sensor Control and Data Analysis
(B) Supervisory Control and Data Acquisition
(C) System Control and Digital Automation
(D) Signal Calculation and Data Acquisition

29. Which instrument measures the concentration of a specific gas in an environment?
(A) Gas chromatograph
(B) Thermocouple
(C) Tachometer
(D) Barometer

30. What is the primary function of a pneumatic actuator?
(A) Converts electrical signals into mechanical motion
(B) Converts pressure into electrical signals
(C) Measures flow rate
(D) Converts mechanical motion into pneumatic pressure

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