Which type of sensor is used to detect metal objects in an industrial automation system?

• Ultrasonic sensor

• Capacitive proximity sensor

• Inductive proximity sensor

• Piezoelectric sensor

Which sensor is best suited for measuring angular velocity in a robotic arm?

• Strain gauge

• Thermistor

• Gyroscope

• Pressure sensor

What type of sensor is commonly used in automatic doors to detect human presence?

• Optical sensor

• Piezoelectric sensor

• Infrared motion sensor

• LVDT

A thermistor changes its resistance based on:

• Magnetic field

• Pressure

• Temperature

• Light intensity

Which type of sensor is most suitable for real-time monitoring of vibrations in rotating machinery?

• Strain gauge

• Accelerometer

• Load cell

• Capacitive sensor

The term "sensitivity" of a sensor refers to:

• The smallest change in input that the sensor can detect

• The ability of the sensor to return to zero when input is removed

• The ratio of output signal change to input signal change

• The time it takes for the sensor to respond to a change in input

A sensor with a high resolution can:

• Detect very small changes in input

• Measure over a very wide range

• Operate at very high temperatures

• Measure with high speed but low accuracy

Which of the following describes "hysteresis" in sensors?

• The difference in output when the same input is approached from increasing or decreasing directions

• The ability of a sensor to operate over a wide temperature range

• The time taken for a sensor to reach a stable reading

• The ability to resist environmental disturbances

A temperature sensor has a sensitivity of 10 mV/°C. If the output voltage is 250 mV, what is the measured temperature?

• 10°C

• 25°C

• 50°C

• 250°C

A load cell has a full-scale output of 5V and a rated load of 500N. What is the output voltage when the applied load is 250N?

• 1.25V

• 2.5V

• 3.75V

• 5V