Sensors and Instrumentations: Chapter 1 Introduction Quiz

A sensing unit can consist of additional components such as filters, amplifiers, and modulators.

The actuating unit consists of an actuator, a power supply, and a coupling mechanism.

When a transducer converts a measurable quantity to an electrical voltage or current, it is called a sensor.

An instrument refers to a sensor together with its associated electronics.

A measurement system requires several transformation steps before the electric output signal can be generated.

Actuators convert an electrical signal into another form of energy, such as sound.

Passive sensors do not require any additional energy source and directly generate an electric signal in response to an external stimulus.

Active sensors do not require external power for their operation.

Digital sensors produce a continuous and proportional signal.

Analog sensors produce a continuous and proportional signal.

Thermistors are an example of active sensors.

A photovoltaic cell requires external power to produce electricity.

Human eyes are an example of sensors that detect light energy.

The brain directly outputs a response to the signals received from the sensors.

Physical sensors detect physical quantities such as force, heat, and light.

Passive sensors incorporate active electronic components such as amplifiers and IC.