1. What is the main purpose of a sensor in industrial systems?
(A) To detect physical quantities and convert them into measurable signals
(B) To amplify electrical power
(C) To generate control pulses
(D) To store data
2. What is a transducer?
(A) A device that converts one form of energy into another
(B) A power amplifier
(C) A logic circuit
(D) A display module
3. Which of the following is a temperature sensor?
(A) Thermocouple
(B) LDR
(C) Hall Effect sensor
(D) Ultrasonic sensor
4. A thermistor is a type of:
(A) Temperature-dependent resistor
(B) Voltage regulator
(C) Pressure sensor
(D) Current limiter
5. Which sensor measures pressure?
(A) Piezoelectric sensor
(B) LDR
(C) Thermistor
(D) Potentiometer
6. An LVDT (Linear Variable Differential Transformer) measures:
(A) Linear displacement
(B) Temperature
(C) Magnetic field
(D) Humidity
7. A strain gauge is used to measure:
(A) Force or deformation
(B) Temperature
(C) Light intensity
(D) Magnetic field
8. Which of the following sensors detects light intensity?
(A) LDR (Light Dependent Resistor)
(B) Thermocouple
(C) Piezoelectric crystal
(D) Potentiometer
9. The Hall Effect sensor is used for:
(A) Magnetic field measurement
(B) Light intensity measurement
(C) Sound detection
(D) Temperature control
10. An RTD (Resistance Temperature Detector) operates based on:
(A) Change in resistance with temperature
(B) Change in capacitance
(C) Change in inductance
(D) Change in magnetic flux
11. A proximity sensor is used to:
(A) Detect the presence of an object without contact
(B) Measure temperature
(C) Measure frequency
(D) Detect pressure
12. Which of the following sensors can detect motion?
(A) PIR (Passive Infrared) sensor
(B) LDR
(C) Thermistor
(D) RTD
13. A capacitive sensor detects:
(A) Changes in dielectric constant
(B) Light intensity
(C) Temperature variation
(D) Frequency shift
14. Which type of transducer converts mechanical motion into electrical signal?
(A) Electromechanical transducer
(B) Electrostatic transducer
(C) Piezoelectric transducer
(D) Thermal transducer
15. Which sensor is used for level measurement in tanks?
(A) Ultrasonic sensor
(B) LDR
(C) RTD
(D) Strain gauge
16. A photoelectric sensor detects:
(A) Presence of an object using light beam interruption
(B) Sound levels
(C) Temperature
(D) Pressure
17. The tacho generator is used to measure:
(A) Speed of rotation
(B) Voltage
(C) Pressure
(D) Frequency
18. A flow sensor measures:
(A) Fluid flow rate
(B) Voltage change
(C) Light intensity
(D) Vibration
19. Which transducer converts sound waves into electrical signals?
(A) Microphone
(B) Speaker
(C) Piezo buzzer
(D) Transistor
20. An encoder is used to measure:
(A) Angular position or rotation
(B) Temperature
(C) Pressure
(D) Humidity
21. A load cell measures:
(A) Force or weight
(B) Speed
(C) Temperature
(D) Vibration
22. The thermocouple output is in the form of:
(A) Voltage
(B) Resistance
(C) Capacitance
(D) Inductance
23. Which of the following sensors works based on Doppler effect?
(A) Radar sensor
(B) LDR
(C) Thermistor
(D) Strain gauge
24. A gyroscope measures:
(A) Angular velocity
(B) Linear displacement
(C) Force
(D) Temperature
25. Which sensor is used for humidity measurement?
(A) Hygrometer
(B) Thermistor
(C) Strain gauge
(D) LVDT
26. Signal conditioning circuits in sensors are used to:
(A) Amplify, filter, and convert signals
(B) Store sensor data
(C) Provide power to transducers
(D) Generate PWM signals
27. The transduction element in a sensor is responsible for:
(A) Converting one form of energy to another
(B) Storing data
(C) Filtering signals
(D) Amplifying current
28. Which type of sensor is commonly used in industrial robotic arms for position feedback?
(A) Rotary encoder
(B) LDR
(C) RTD
(D) Piezoelectric sensor
29. In industrial automation, sensors are used primarily for:
(A) Monitoring and feedback control
(B) Increasing signal noise
(C) Power amplification
(D) Data encryption
30. Which of the following is a non-contact type sensor?
(A) Ultrasonic sensor
(B) Potentiometer
(C) Strain gauge
(D) Thermistor