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Electronics 3 > Transducers > Flashcards

Transducers Flashcards

1
Q

An electronic device that converts energy from one form to another.

A

Transducers

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2
Q

Process of converting energy from one form to another

A

Transduction

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3
Q

Output obtained from transducers is always in the _____ form.

A

Electrical

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4
Q

What are the main types of transducers?

A

Active Transducer
Passive Transducer

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5
Q

Does not require any power source in order to function

A

Active Transducers

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6
Q

Needs an external power source to operate

A

Passive Transducer

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7
Q

Is a passive transducer which varies the voltage of the electrical output from the cell when a torque is applied

A

Torque Transducer

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8
Q

Is a passive transducer which will vary the resistance of the cell when light falls on it.

A

Photocell

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9
Q

Is a passive transducer used to measure stress or pressure

A

Bonded Strain Gauge

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10
Q

Types of Transducers Based on Quantity to be Measured

A

Temperature Transducers
Pressure Transducers
Displacement Transducers
Oscillator Transducer
Flow Transducers
Inductive Transducers

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11
Q

Converts the thermal quantity into any physical quantity

A

Temperature Transducers

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12
Q

Types of Temperature Transducers

A

-Contact Temperature Sensor Types
-Non-Contact Temperature Sensor Types
-Thermistor
-Resistance Thermometers
-Thermocouples
-Integrated Circuit Temperature Transducers

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13
Q

The sensing element in this is in direct contact with the thermal source

A

Contact Temperature Sensor Types

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14
Q

The sensing element in this is not in direct contact with the thermal source

A

Non-Contact Temperature Sensor Types

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15
Q

What heat transfer is used in Contact Temperature Sensor Types?

A

Conduction

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16
Q

What heat transfer is used in non-contact sensor types?

A

Convection

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17
Q

The resistance changes with the change of temperature

A

Thermistor

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18
Q

Precision temperature sensors made from high-purity conducting metals

A

Resistance Thermometers

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19
Q

Resistance of Thermistors

A

0.5 to 0.75M

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20
Q

Consists of 2 junctions of dissimilar metals, such as copper and constantan that are welded

A

Thermocouples

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21
Q

A phenomenon in which a temperature difference between two dissimilar electrical conductors or semiconductors produces a voltage difference between the 2 substances

A

Seebeck Effect

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22
Q

transducer that use the temperature sensing element with monolithic electronic circuits as a combination for the measurement of temperature.

A

Integrated Circuit Temperature Transducers

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23
Q

Is a temperature sensitive zener diode

A

LM335

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24
Q

Used to measure pressure

A

Pressure Transducer

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25
Q

Measures large displacements such as brake pedal travel or pneumatic actuator displacement

A

Linear Variable Dependent Transducers (LVDT)

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26
Q

Used to measure force, pressure or displacement by converting it to a voltage.

A

Oscillator Transducer

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27
Q

Parts of an Oscillatory Transducer

A

Mechanical Linkage
Oscillator
Frequency Modulator
Force Summing Member

28
Q

Used to link the input quantity to the secondary transducer

A

Mechanical Linkage

29
Q

Used to generate desired frequency

A

Oscillator

30
Q

Used for modification of output frequency from the oscillator for telemetry purpose

A

Frequency Modulator

31
Q

Is used to change the capacitance or inductance of an LC oscillator circuit

A

Force Summing Member

32
Q

Used to measure air and liquid flow velocity

A

Flow Transducers

33
Q

Works by measuring the amount of a liquid, gas, or steam flowing through or around the flow meter sensors

A

Flow Meter

34
Q

Types of Flow Meters

A

Capillary Thermal Mass
Immersible Thermal Mass
Vortex Shedding
Transit-Time Ultrasonic

35
Q

Thermal heat is transferred between gas passing through a very small tube and a set of resistance temperature
detectors (RTDs) to measure the mass flow of the gas.

A

Capillary Thermal Mass

36
Q

uses the thermal heat
transferred from a heated sensor immersed in the
flow to measure the mass flow of the gas

A

Immersible Thermal Mass

37
Q

Measures mass and/or
volumetric flow of liquids, gases, and steam using
vortices shed from a sensor immersed in the flow and
a computed fluid density

A

Vortex Shedding

38
Q

measure speed of a fluid
passing through a pipe using ultrasound.

A

Transit-Time Ultrasonic

39
Q

Is the self-generating
type otherwise the passive type transducer.

A

Inductive Transducer

40
Q

Types of Inductive Transducers

A

Simple Inductance
Two-coil Mutual Inductance

41
Q

A simple single coil is used as a transducer

A

Simple Inductance

42
Q

two different coils are arranged

A

Two-coil Mutual Inductance

43
Q

Types of Transducers Based on Principle of Operation

A

Photovoltaic
Piezoelectric Transducer
Chemical
Mutual Induction
Electromagnetic
Hall Effect
Photoconductor

44
Q

Converts light energy to electrical energy

A

Photovoltaic

45
Q

Classification of Photoelectric Transducers

A

Photo-emissive Cell
Photovoltaic Cell
Photo-conductive Cell
Photodiode
Phototransistor

46
Q

Is based on the emission of
electrons when the transducer is exposed to sunlight.

A

Photo-emissive Transducer

47
Q

Consists of an anode
rod and a cathode plate enclosed in a vacuum glass tube.

A

Vacuum Phototube

48
Q

It is the most popular and most widely used photo-emissive transducer.

A

Photomultiplier

49
Q

Is also known as a solar
cell. It converts electromagnetic radiation into an electrical signal.

A

Photovoltaic Cell

50
Q

It works on the principle of photoconductive effect.

A

Photo-conductive Cell

51
Q

acts as a light-sensitive
device and converts the illuminated light into
an electrical signal.

A

Photodiode

52
Q

Are similar to regular NPN
or PNP or FET transistors with three layers but with a light-sensitive base region.

A

Phototransistor

53
Q

is a device that uses
the piezoelectric effect to measure changes in acceleration, pressure, strain,
temperature or force by converting this energy into an electrical charge.

A

Piezoelectric Transducer

54
Q

Behaves in the
reverse manner of the piezoelectric sensor.
It is the one in which the electric effect will
cause the material to deform

A

Piezoelectric Actuator

55
Q

Who discovered piezoelectric effect?

A

Pierre and Jacques Curie

56
Q

states that when mechanical stress or forces are applied on quartz crystal, produce electrical charges on the quartz crystal surface.

A

Piezoelectric Effect

57
Q

is anything that produces sound.

A

Buzzer

58
Q

depends on acoustic cavity
resonance to produce an audible beep.

A

Piezoelectric Buzzer

59
Q

It transforms the energy into some form of analytical signal.

A

Chemical

60
Q

is a device that measures and detects chemical qualities in an analyze and converts the sensed chemical data into electronic data.

A

Chemical Sensor

61
Q

Is the component of the
chemical sensor that comes into physical contact with the analyze

A

Receptor

62
Q

In this type, two coils are used. One for generating excitation and another for output.

A

Mutual Induction

63
Q

Is a transducer for non-contact
acoustic wave generation and reception in conducting materials.

A

Electromagnetic acoustic transducer (EMAT)

64
Q

It is used for measuring the magnetic field by converting the field into an emf

A

Hall Effect

65
Q

It converts the magnetic field into an electric quantity, readily estimated by the analog and digital measures.

A

Hall Effect Transducer

66
Q

It is employed to convert light energy into electrical energy. It is composed of semiconductor substance.

A

Photoconductor

Electronics 3 (7 decks)

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