Measurements and Measuring Systems: Lecture 5

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What is the primary function of a transducer?

To generate a new signal from scratch

To amplify an existing signal

To receive a signal in one form of energy and convert it to another form (correct)

To filter out unwanted signals

Which of the following is an example of an analog transducer?

A digital encoder

A digital thermometer

A binary switch

A strain gauge (correct)

What distinguishes a primary transducer from a secondary transducer?

Primary transducers are more expensive than secondary transducers

Primary transducers directly convert a physical phenomenon into an electrical signal (correct)

Primary transducers are more accurate than secondary transducers

Primary transducers are always analog, while secondary transducers are always digital

Which of the following is an example of a digital transducer?

An optical encoder Signup and view all the answers

Which of the following energy domains is NOT mentioned in the text as a typical domain for transducers?

Nuclear Signup and view all the answers

What does 'span' refer to in the context of sensors?

The difference between the maximum and minimum input values Signup and view all the answers

What is the purpose of a speaker?

To convert electrical signals into sound Signup and view all the answers

How is 'resolution' of a sensor defined?

As the smallest change the sensor can differentiate Signup and view all the answers

Which characteristic of sensors is described by 'repeatability'?

The ability to produce the same output with consistent inputs Signup and view all the answers

What does 'linearity' reflect in a sensor?

The maximum deviation from an ideal curve across the full range Signup and view all the answers

In terms of sensors, how is 'error' defined?

The difference between actual measured value and true value Signup and view all the answers

What is 'accuracy' related to in the context of sensors?

The closeness between actual measured value and true value Signup and view all the answers

What is the function of a secondary transducer?

To convert the input signal into an electrical form Signup and view all the answers

Which of the following is a characteristic of active transducers?

They generate an output without an auxiliary source Signup and view all the answers

What is the primary function of an "input" transducer or actuator?

To impose an action on the system, such as opening a valve Signup and view all the answers

Which of the following best describes a sensor?

A transducer that monitors a system and responds to input Signup and view all the answers

What is the output of a sensor typically proportional to?

The physical input being measured Signup and view all the answers

Which of the following statements about passive transducers is true?

They require an external source of power for their operation Signup and view all the answers

What is the primary function of sensors?

To detect and measure various forms of energy or stimuli Signup and view all the answers

How do human beings perceive sensory information?

Through specialized organs like the eyes, ears, tongue, nose, and skin Signup and view all the answers

What is the primary function of an actuator?

To convert energy into motion or physical action Signup and view all the answers

Which of the following is an example of an actuator?

An electric motor Signup and view all the answers

What is the primary difference between sensors and actuators?

Sensors detect energy, while actuators convert energy into motion Signup and view all the answers

Which of the following statements is true about sensors?

Sensors are present in various applications, including our bodies and everyday devices Signup and view all the answers

What is the formula for calculating accuracy?

Accuracy = (Measured value - True value) / True value Signup and view all the answers

How is precision defined?

Precision is defined as the closeness among a set of values. Signup and view all the answers

What is the relationship between precision and accuracy?

Precision is a necessary but not sufficient condition for accuracy. Signup and view all the answers

What does the response time of a sensor describe?

The time it takes for the sensor to respond completely to a change in input. Signup and view all the answers

What is the most commonly used position sensor?

Potentiometer Signup and view all the answers

How does the output signal from a potentiometer change with position?

The output signal is proportional to the position of the wiper. Signup and view all the answers