Sensors Technology for Machines 2

What is the primary function of a sensor in machines?

• Store data

• Convert physical quantity to a measurable electrical signal

• Increase speed

• Add weight

Which of the following is an example of a direct measurement method?

• Calculating length by using time

• Weighing with a balance

• Computing speed from distance and time

• Estimating humidity by color

Dynamic response of a sensor means:

• Power consumption

• Rate at which the sensor output changes after an input change

• Its size

• Data storage

Which of the following ensures measurement accuracy and traceability in industrial sensors?

• Frequent replacement

• Calibration

• Painting

• Heating

A sensor that produces a digital output signal (on/off) is:

• LDR

• Proximity switch

• Strain gauge

• RTD

Which sensor can generate a signal without external power?

• RTD

• Piezoelectric sensor

• Hall sensor

• Ultrasonic sensor

Active sensors are those that:

• Require external power to work

• Work without any power

• Only for light sensing

• None of the above

Which is a passive sensor?

• RTD

• Thermocouple

• LVDT

• All of the above

Photoelectric sensors detect:

• Movement

• Light

• Both of the above

• Sound only

A proximity sensor can detect:

• Only metal objects

• Only liquids

• Presence without contact

• Only temperature