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WorksheetsIndustrial Electronics - Transducers
Total questions: 100
Worksheet time: 34mins
Name
Class
Date
1.
A resistor made of semiconductor material which is extremely sensitive to temperature
a)
Varistor
b)
Thermistor
c)
Thermocouple
d)
Potentiometer
2.
The output voltage of a thermocouple
a)
Remains constant with temperature
b)
Increases with temperature
c)
Increases with applied voltage
d)
Decreases with applied voltage
3.
Thermistor operation
a)
Depends on external temperature change
b)
Depends on internal temperature
c)
Is independent of current direction
d)
All of the above
4.
The conductivity of a photoconductive cell
a)
Varies directly with light intensity
b)
Varies inversely with resistance
c)
Increases as the intensity increases
d)
All of these
5.
Photoconductive cells are used in:
a)
Temperature measurement circuits
b)
Light measurement and control circuits
c)
Temperature control circuits
d)
Light amplification circuits
6.
The photovoltaic cell can be used in:
a)
Solar batteries
b)
Commercial display
c)
Minimum maintenance
d)
All of these
7.
The photovoltaic cell produces maximum power:
a)
Only at high intensities
b)
Only at low intensities
c)
At approximately the same output voltage for different light
d)
Only for low loads
8.
The primary purpose of a photovoltaic cell is to convert:
a)
Light into sound
b)
Light into heat
c)
Light into electricity
d)
Electricity into light
9.
The term _______ encompasses three separably identified effects: the Seebeck effect, the Peltier effect, and the Thomson effect.
a)
Thermoelectric effect
b)
Johnson effect
c)
Debeye effect
d)
Joule effect
10.
It measures the magnitude of an induced thermoelectric voltage in response to a temperature difference across a material.
a)
Thermoelectric power
b)
Seebeck coefficient
c)
Either
d)
None
11.
What is the current through the photodiode when it is operated in photoconductive mode in the absence of light?
a)
Leakage current
b)
Dark current
c)
Reverse current
d)
Offset current
12.
When photodiodes are used in zero biased mode, what mode of operation are they in?
a)
Photovoltaic mode
b)
Avalanche mode
c)
Photoconductive mode
d)
Breakdown mode
13.
_______ is just an array of large-area photodiodes.
a)
Solar cell
b)
Phototransistor
c)
Photomultipliers
d)
Photodetector
14.
Photodiodes and phototransistors are used
a)
Sense light by permitting current to pass in rough proportion to light intensity
b)
Generate light for transmitting information or illumination
c)
Block current when light strikes them, and pass current when dark
d)
Used as standard diodes and transistors
15.
Which device uses the principle that light striking a PN junction knocks bound electrons out of their "sockets" and greatly increases the reverse leakage current?
a)
The photodiode
b)
The phototransistor
c)
The light-emitting diode (LED)
16.
Optoelectronic devices are particularly useful in nighttime surveillance systems and burglar alarms because
a)
The light generated by most LEDs is of an invisible infrared color
b)
Typical light sensors are most sensitive to invisible infrared color
c)
The existence of these devices is not very widely known
17.
The data-sheet specifications of optoelectronic devices include
a)
Specifications that apply to ordinary diodes and transistors
b)
Light current IL and dark current I0 for sensors
c)
Wavelength specifications describing the color of light emitted by LEDs
d)
All of the above
18.
What determines if a thermistor's temperature coefficient is positive or negative?
a)
The polarity of the applied voltage
b)
The direction of the current through the thermistor
c)
The location of the thermistor in a bridge circuit
d)
None of the above
19.
A thermocouple has a
a)
Positive temperature coefficient
b)
Negative temperature coefficient
c)
Perfectly linear response
d)
High voltage output
20.
What type of capacitance sensor can detect the presence of an object without actually touching it?
a)
Proximity detector
b)
Touch sensor
c)
Position sensor
d)
None of the above
21.
A ______ is a device that detects, and measures, the amount of torque that a robot motor applies at any given time.
a)
back pressure sensor
b)
tactile sensor
c)
wrist-force sensor
d)
joint-force sensor
22.
When a photodiode is not used as a photovoltaic cell, it has ______
a)
Forward bias
b)
Reverse bias
c)
Conduction mode
d)
Zero bias
23.
What sensor which is an acoustic interferometer that employs a set of transducers that emit acoustic waves at frequencies above the range of human hearing (higher than 20 kHz) in order to detect the motion in a room by sensing the changes in the relative phase of acoustic waves?
a)
Ultrasonic Motion Detector
b)
Tactile sensor
c)
Proximity sensor
d)
IR Motion Detector
24.
A radiation detector that converts incident radiation to heat is called
a)
Thermometer
b)
Slot detector
c)
Metal detector
d)
Bolometer
25.
The synergistic use of multiple sources of sensory information to assist in the accomplishment of a task.
a)
Sensor fusion
b)
Sensor integration
c)
Sensor Differentiation
d)
Either A or B
26.
What is the smallest angular or linear separation between two objects that can be resolved by the sensor?
a)
Spatial resolution
b)
Angular displacement
c)
Spatial dislodgement
d)
Angular difference
27.
Which of the following is the most common bolometric detector?
a)
RTD
b)
Thermistor
c)
Thermocouple
d)
Slot detector
28.
A detector of electromagnetic radiation which converts a quantum of the radiation into a proportionate signal by some process which is insensitive to quanta of less than a certain energy; examples include photographic emulsions, photoelectric cells, and Geiger counters.
a)
Radiometer
b)
Quantum detector
c)
Bolometer
d)
Bosonometer
29.
What microwave sensing element can be operated at frequencies greater than 100 GHz?
a)
Thermowell sensor
b)
Thermistor sensor
c)
RTD sensor
d)
Thermocouple sensor
30.
What is the operating frequency of microwave sensing element diode sensor?
a)
Greater than 10 GHz
b)
Less than 10 GHz
c)
Greater than 18 GHz
d)
Less than 18 GHz
31.
What transduction principle is used primarily in optic sensors?
a)
Photoelectric transduction
b)
Photovoltaic transduction
c)
Photoconductive sensing
d)
Photoeffect sensing
32.
In an acceleration transducer, what is the sensing element?
a)
Accelerometer
b)
Speedometer
c)
Seismic mass
d)
Bourdon tube
33.
What is one of the most widely used sensing elements mainly for pressure ranges greater than 2 MPa?
a)
Accelerometer
b)
Speedometer
c)
Seismic mass
d)
Bourdon tube
34.
What is another name for an acceleration transducer?
a)
Accelerometer
b)
Speedometer
c)
Seismic mass
d)
Bourdon tube
35.
What sensing element is typically made from a thin-walled tube formed into deep convolutions and sealed at one end, whose displacement can then be made to act on a transduction element?
a)
Accelerometer
b)
Bellow
c)
Seismic mass
d)
Bourdon tube
36.
What type of sensor can provide a DC voltage of about 1 V at 10 mW?
a)
Semiconductor sensor
b)
Diode sensor
c)
Resistor sensor
d)
Transistor sensor
37.
The typical power range of thermocouple sensors is from:
a)
10 μW - 100 μW
b)
0.1 mW - 10 mW
c)
0.1 μW - 100 mW
d)
1 mW - 100 mW
38.
The typical power range of thermistor sensors is from:
a)
1 μW - 10 mW
b)
0.1 mW - 10 mW
c)
0.1 μW - 100 mW
d)
1 mW - 100 mW
39.
What is the common error in thermocouple sensors?
a)
Seebeck effect
b)
Cold and junction effect
c)
Thermocouple effect
d)
Bridgman effect
40.
When a photodiode and LED are combined in a single diode, it is called:
a)
Photoisolator
b)
Phototransistor
c)
Optoconductor
d)
Optoisolator
41.
The typical output voltage of high-level signal transducers is about:
a)
0 V to ±2.5 V
b)
0 V to ±5 V
c)
1.5 V to ±3 V
d)
1.5 V to ±4.5 V
42.
The typical output voltage of low-level signal transducers is about:
a)
±5 mV to ±250 mV
b)
±50 mV to ±500 mV
c)
±15 mV to ±300 mV
d)
±1.5 mV to ±4.5 mV
43.
A _____ is an electronic device that converts thermal energy into electrical energy and is composed of thermocouples connected in series or parallel.
a)
Thermopile
b)
Thermopylae
c)
Thermocluster
d)
Thermoseries
44.
The _____ of a material measures the magnitude of an induced thermoelectric voltage in response to a temperature difference.
a)
Thermopower
b)
Thermoelectric power
c)
Seebeck coefficient
d)
All of the above
45.
What are non-contact devices capable of high-resolution measurement of the position or movement of conductive targets?
a)
Capacitive displacement sensors
b)
Droid sensors
c)
Catadioptric sensors
d)
Reed sensors
46.
Sensors with inherent intelligence via built-in electronics.
a)
Autonomous Sensors
b)
Independent Sensors
c)
Smart Sensors
d)
MEMS Sensors
47.
What device contains a physical mechanism or electronic sensor that quantifies motion, either integrated with or connected to other devices that alert the user to the presence of a moving object within the field of view?
a)
Passive infrared sensor
b)
Ultrasonic sensor
c)
Microwave detector
d)
Ghanta detector
48.
In what generation of Microelectromechanical systems (MEMS) is the sensor element mostly based on a silicon structure, sometimes combined with analog amplification on a microchip?
a)
First generation
b)
Second generation
c)
Third generation
d)
Fourth generation
49.
A ________ is a type of sensor network or Geographic Information System (GIS) that is especially well suited for environmental monitoring.
a)
Sensor pod
b)
Sensor husk
c)
Sensor shell
d)
Sensor web
50.
In what generation of MEMS sensor are memory cells for calibration and temperature compensation added to the elements of the third MEMS sensor generation?
a)
First generation
b)
Second generation
c)
Third generation
d)
Fourth generation
51.
In what generation of MEMS sensor is the element combined with analog amplification and an analog-to-digital converter on one microchip?
a)
First generation
b)
Second generation
c)
Third generation
d)
Fourth generation
52.
In what generation of MEMS is the combination of the sensor element with analog amplification, analog-to-digital converter, and digital intelligence for linearization and temperature compensation all on the same microchip?
a)
First generation
b)
Second generation
c)
Third generation
d)
Fourth generation
53.
What is the ratio of the change in sensor output to a change in the value of the measurand?
a)
Sensitivity
b)
Reactivity
c)
Repeatability
d)
Stability
54.
________ are any biological, chemical, or surgery sensory points used to convey information about nanoparticles to the macroscopic world.
a)
MEMS sensors
b)
Nanosensors
c)
Microsensors
d)
Diminutive sensors
55.
What sensor network consists of spatially distributed autonomous sensors to cooperatively monitor physical or environmental conditions, such as temperature, sound, vibration, pressure, and motion?
a)
Autonomous Sensor Network
b)
Wireless Sensor Network
c)
Independent Sensor Network
d)
Free Sensor Network
56.
What is the ability of a sensor to reproduce output readings for the same value of measurand, when applied consecutively and under the same conditions?
a)
Sensitivity
b)
Selectivity
c)
Repeatability
d)
Stability
57.
What is the ability of a sensor to retain its characteristics over a relatively long period of time?
a)
Sensitivity
b)
Selectivity
c)
Repeatability
d)
Stability
58.
What type of sensors that is embedded acoustic (vibration) sensors (similar to a microphone) that adaptively yield a signal proportional to the acoustic input?
a)
Electroacoustic smart sensors
b)
Magnetostriction-Based sensors
c)
Electromagnetics-Based sensors
d)
Magnetostriction-Based sensors
59.
What part of a biosensor transforms the signal resulting from the interaction of the analyte with the biological element into another signal that can be more easily measured and quantified?
a)
Detector element
b)
Sensitive biological element
c)
Sensor amplifier
d)
Sensitive filter
60.
What electrical device converts ground movement (displacement) into voltage?
a)
Seismometer
b)
Geophone
c)
Seismophone
d)
Seismicphone
61.
What is the type of sensor that is used to measure position and speed of moving metal components?
a)
Throttle position sensor
b)
Speed sensor
c)
Variable reluctance sensor
d)
Accelerometer
62.
What is a small Doppler radar unit used to detect the speed of objects, especially trucks and automobiles for the purpose of speed limit enforcement, as well as pitched baseballs, automatic door openers, runners, or other moving objects in sports?
a)
Speed sensor
b)
Speedometer
c)
Variable reluctance sensor
d)
Speed gun
63.
What is a transducer that varies its output voltage in response to changes in a magnetic field?
a)
Magnetic sensor
b)
Hall effect sensor
c)
Thermoelectric effect sensor
d)
Seebeck effect sensor
64.
__________ is used for detecting particles of ionizing radiation.
a)
Geiger counter
b)
Bubble chamber
c)
Scintillator
d)
Cloud chamber
65.
It is a gyroscopic device that measures a vehicle's angular velocity around its vertical axis.
a)
Throttle position sensor
b)
Speed sensor
c)
Variable reluctance sensor
d)
Yaw rate sensor
66.
What vacuum tube device is extremely sensitive to detecting light in the ultraviolet, visible, and near-infrared ranges of the electromagnetic spectrum?
a)
Phototubes
b)
Photomultipliers
c)
TWT
d)
Avalanche Photodiode
67.
Which of the following is/are the other name/s of a photoresistor?
a)
i only
b)
i & ii only
c)
ii & iii only
d)
all of the above
68.
It is a type of wavefront sensor that is commonly used in adaptive optics systems. It consists of an array of lenses (called lenslets) of the same focal length.
a)
Hartmann-Shack
b)
Scheiner-Hartmann
c)
Adaptive lens sensor
d)
Optics lens sensor
69.
A wavefront sensor is a device for measuring the aberrations of a/an __________.
a)
optical wavefront
b)
electromagnetic wavefront
c)
magnetic wavefront
d)
electrical wavefront
70.
The following are common thermocouple codes except:
a)
K
b)
C
c)
J
d)
T
71.
What is the composition of thermocouple code B?
a)
wire A: Nickel-Chromium (Chromel) & wire B: Copper-Nickel (Constantan)
b)
wire A: Platinum-13%Rhodium & wire B: Platinum
c)
wire A: Platinum-10%Rhodium & wire B: Platinum
d)
wire A: Platinum-30%Rhodium & wire B: Platinum-6%Rhodium
72.
What characteristic of biosensor measures the value of the electrode response per substrate concentration?
a)
Selectivity
b)
Responsivity
c)
Sensitivity
d)
Response time
73.
What is the temperature range (in °C) of tungsten type RTD?
a)
-184 to 815
b)
-73 to 149
c)
-51 to 149
d)
-73 to 276
74.
Which of the following is/are important characteristic/s of a biosensor? i. Sensitivity ii. Selectivity iii. Response time iv. Linearity v. Responsivity
a)
i, ii & v only
b)
i, ii, iii & v
c)
i, ii, iii & iv
d)
all of the above
75.
What general type of thermocouple sensor is suitable for use on motor shafts and flat sheets of metal, plastic, and textile surfaces with low abrasion resistance?
a)
Heavy duty metal sheathed thermocouple
b)
High temperature ceramic sheathed thermocouple
c)
Moving surface thermocouple
d)
Self-adhesive patch thermocouple
76.
What general type of thermocouple is suitable for attaching to flat or curved surfaces?
a)
Heavy duty metal sheathed thermocouple
b)
High temperature ceramic sheathed thermocouple
c)
Moving surface thermocouple
d)
Self-adhesive patch thermocouple
77.
Which of the following is not the common metal used in RTD?
a)
Platinum
b)
Nickel
c)
Tungsten
d)
Chromium
78.
A _____ is a transducer that is used to convert a force into an electrical signal.
a)
Generator
b)
Strain gauge
c)
Load cell
d)
Motor
79.
What category of RTD is widely available and very inexpensive? They have very reproducible results at low temperatures and are the most reliable form at extremely low temperatures.
a)
Carbon resistors
b)
Metal film
c)
Wire-wound
d)
Coil elements
80.
What category of RTD can have greater accuracy, especially for wide temperature ranges?
a)
Carbon resistors
b)
Metal film
c)
Wire-wound thermometers
d)
Thermistor
81.
What category of RTD has a layer of platinum on a substrate, with the layer being extremely thin, perhaps one micrometer? Its advantages are relatively low cost and fast response.
a)
Carbon resistors
b)
Metal film
c)
Wire-wound thermometers
d)
Thermistor
82.
Which of the following are the advantages of platinum resistance thermometers? i. High accuracy ii. Low drift iii. Wide operating range iv. Suitable for precision applications
a)
i, ii & iii
b)
ii, iii & iv
c)
i & iv
d)
All of the above
83.
What is the process of combining sensory data or data derived from sensory data from disparate sources such that the resulting information is in some sense better than would be possible when these sources were used individually?
a)
Sensor fusion
b)
Sensor integration
c)
Sensor differentiation
d)
Either A or B
84.
What common error source of Platinum Resistance Thermometers (PRT) is caused by the inability to measure the actual resistance of the element?
a)
Hysteresis
b)
Repeatability
c)
Stem conduction
d)
Insulation resistance
85.
What common error source of Platinum Resistance Thermometers (PRT) results from the PRT sheath conducting heat into or out of the process?
a)
Interpolation
b)
Stem conduction
c)
Insulation resistance
d)
Lead wire
86.
What common error source of Platinum Resistance Thermometers (PRT) is produced during temperature transients because the PRT cannot respond to changes fast enough?
a)
Time response
b)
Thermal EMF
c)
Stem conduction
d)
Self heating
87.
What common error source of Platinum Resistance Thermometers (PRT) is produced by the EMF adding to or subtracting from the applied sensing voltage, primarily in DC systems?
a)
Time response
b)
Thermal EMF
c)
Stem conduction
d)
Self heating
88.
A common form of resistance thermometer element with a wire coil sealed in a ceramic cylinder, works with temperatures up to 850 °C.
a)
Unsupported wirewound
b)
Wirewound in a ceramic insulator
c)
Wire encapsulated in glass
d)
Thin film
89.
What element form of resistance thermometer has a wire coil minimally supported within a sealed housing filled with an inert gas? These sensors are used up to 961.78 °C.
a)
Unsupported wirewound
b)
Wirewound in a ceramic insulator
c)
Wire encapsulated in glass
d)
Thin film
90.
A _____ is a set of several sensors that an information-gathering device uses to gather information (usually directional in nature) that cannot be gathered from a single source for a central processing unit.
a)
Sensor array
b)
Sensor husk
c)
Sensor shell
d)
Sensor web
91.
What transducer detects and measures the instantaneous torque that a robot motor applies?
a)
Rotor-motor sensor
b)
Armature sensor
c)
Torque sensor
d)
Back-pressure sensor
92.
What type of electronic proximity sensor which detects metallic objects without touching them?
a)
Capacitive sensor
b)
Inductive sensor
c)
Automatic sensor
d)
NO touch sensor
93.
What is the electromagnetic spectrum wavelength range (in nanometer) of silicon material used in photodiodes?
a)
190 - 1100
b)
400 - 1700
c)
800 - 2600
d)
<1000 - 3500
94.
What is the electromagnetic spectrum wavelength range (in nanometer) of germanium material used in photodiodes?
a)
190 - 1100
b)
400 - 1700
c)
800 - 2600
d)
<1000 - 3500
95.
What material is used in photodiodes that generates less noise?
a)
Germanium
b)
Silicon
c)
Indium gallium arsenide
d)
Lead(II) sulfide
96.
Which of the following is NOT an advantage of photodiodes over photomultipliers?
a)
Excellent linearity of output current as a function of incident light
b)
Low noise
c)
Ruggedized to mechanical stress
d)
Small area
97.
The following are the disadvantages of photodiode EXCEPT
a)
No internal gain
b)
Much lower overall sensitivity
c)
Response time for many designs is slower
d)
Long lifetime
98.
What type of electrical transformer used for measuring linear displacement? It has three solenoidal coils placed end-to-end around a tube.
a)
Selsyn
b)
Linear variable differential transformer
c)
Center-tapped transformer
d)
Rotary variable differential transformer
99.
Linear variable differential transformer has how many secondary windings?
a)
one
b)
two
c)
three
d)
four
100.
What transduction principle used primary in optical sensors?
a)
Photoconductive Transduction
b)
Photovoltaic Transduction
c)
Electromagnetic Transduction
d)
Piezoelectric Transduction
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