Instrumentation day 3

What type of light sensor is a solar cell?

• Photo conductive cells

• Photo-junction devices

• Photo-voltaic cells

• Light dependent resistor

What does LDR mean?

What type of level sensor is shown?

• Capacitive level sensor

• Inductive level sensor

• Ultrasonic sensor

• Tuning fork sensor

What type of sensor calculates the time it takes for the sound waves to return? It determines the distance.

• Ultrasonic sensor

• Level sensor

• Gas sensor

• Photo diode

Level switch is a point level measurement.

• True

• False

What type of level sensor is used in an oily water separator?

• Conductive level sensor

• Capacitive level sensor

• Tuning fork sensor

• Radar sensor

Which kind of proximity sensor produces an electromagnetic field that is limited to metal detection?

• Inductive

• Capacitive

• Optical

• Radar

A kind of light sensor, which light energy is transformed into electrical energy in the form of DC voltage.

All proximity sensor needs a power source prior of detection.

• True

• False

A NPN proximity sensor when detects an object the output /load voltage is connected to the ________ supply voltage.