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WorksheetsBEEE0050: Sensors & Transducers- Quiz-1
Total questions: 30
Worksheet time: 16mins
Name
Class
Date
1.
Which of the following best defines a transducer?
a)
A device that only senses mechanical energy
b)
A device that converts one form of energy into another
c)
A device that stores energy
d)
A device that amplifies signals
2.
The resolution of a potentiometric sensor primarily depends on:
a)
Length of the resistive element
b)
Material used
c)
Wiper contact area
d)
Number of turns
3.
The sensitivity of a potentiometric sensor is expressed as:
a)
Change in resistance per unit displacement
b)
Change in voltage per unit displacement
c)
Change in current per unit displacement
d)
Change in power per unit displacement
4.
The gauge factor of a strain gauge is defined as the ratio of:
a)
Fractional change in resistance to applied load
b)
Fractional change in resistance to fractional change in length
c)
Resistance to strain
d)
Stress to strain
5.
Which material is commonly used in strain gauge fabrication?
a)
Nichrome
b)
Copper
c)
Silicon
d)
Graphite
6.
What is the main purpose of adhesive in a strain gauge?
a)
To reduce resistance
b)
To increase resistance
c)
To bond the gauge to the specimen
d)
To prevent temperature variation
7.
A strain gauge rosette is used to:
a)
Increase sensitivity
b)
Measure strain in multiple directions
c)
Reduce noise
d)
Compensate temperature
8.
Which type of inductive sensor operates on reluctance change principle?
a)
Ferromagnetic plunger type
b)
Mutual inductance type
c)
Transformer action type
d)
Magnetostrictive type
9.
In a mutual inductance change type sensor, the output depends on:
a)
Self-inductance
b)
Variation in coupling between coils
c)
Magnetic hysteresis
d)
Core material expansion
10.
Magnetostrictive sensors work based on:
a)
Change in resistance due to stress
b)
Change in magnetic permeability due to strain
c)
Change in capacitance due to displacement
d)
Change in reluctance
11.
An LVDT provides which type of output?
a)
Digital
b)
Linear voltage proportional to displacement
c)
Current
d)
Pulsed
12.
The null position of an LVDT is defined as:
a)
Core is at extreme displacement
b)
Secondary voltages are equal and opposite
c)
Primary winding is de-energized
d)
Output voltage is maximum
13.
Which material is commonly used for the core of an LVDT?
a)
Aluminum
b)
Ferromagnetic alloy
c)
Copper
d)
Graphite
14.
Which of the following sensors is commonly used for detecting nearby metallic objects?
a)
Capacitive sensor
b)
Optical sensor
c)
Inductive sensor
d)
Thermocouple
15.
Sensitivity of a parallel plate capacitive sensor (with variable distance) is inversely proportional to:
a)
Dielectric constant
b)
Plate area
c)
Separation distance squared
d)
Input voltage
16.
In a cylindrical capacitive sensor, capacitance depends on:
a)
Radius ratio of inner and outer cylinders
b)
Material conductivity
c)
Current density
d)
Magnetic flux
17.
Variable dielectric capacitive sensors work by:
a)
Changing the material between plates
b)
Changing the plate spacing
c)
Changing applied frequency
d)
Changing the applied voltage
18.
Capacitive sensors are often used in industry to measure:
a)
Flow rate of liquid
b)
Displacement and pressure
c)
Temperature
d)
Torque
19.
What is the primary application of inductive sensors in industrial automation?
a)
Measuring temperature variations
b)
Detecting metal objects
c)
Monitoring fluid levels
d)
Calculating weight of materials
20.
Which sensor is most appropriate for weight measurement in industry?
a)
Strain gauge based load cell
b)
LVDT
c)
Capacitive sensor
d)
Thermistor
21.
The industrial application of resistive sensors includes:
a)
Force measurement
b)
Displacement measurement
c)
Magnetic flux measurement
d)
Light intensity measurement
22.
Which factor is critical when using capacitive sensors in a humid environment?
a)
Dielectric constant variation
b)
Magnetic permeability
c)
Adhesive bonding
d)
Core saturation
23.
Strain gauges used in pressure sensors convert pressure into:
a)
Displacement
b)
Strain
c)
Temperature
d)
light Intensity
24.
Which property of strain gauges makes temperature compensation necessary?
a)
Adhesive degradation
b)
Gauge factor variation
c)
Resistance change with temperature
d)
Linear output
25.
The accuracy of a potentiometer sensor decreases mainly due to:
a)
High dielectric constant
b)
Wear of wiper contact
c)
Variation in gauge factor
d)
Magnetic interference
26.
In inductive sensors, eddy current losses occur mainly due to:
a)
Magnetic flux leakage
b)
Core hysteresis
c)
Changing magnetic fields in conductors
d)
Skin effect
27.
Capacitive sensors are NOT suitable for measurement of:
a)
Displacement
b)
Temperature
c)
Dielectric constant
28.
The excitation frequency of an LVDT is normally:
a)
10 Hz
b)
20 Hz
c)
10 kHz
d)
10 MHz
29.
Strain gauge adhesives must possess which property?
a)
High electrical conductivity
b)
High thermal conductivity
c)
Good bonding strength and low creep
d)
Ferromagnetic property
30.
Which of the following is an example of a passive sensor?
a)
LVDT
b)
Strain gauge
c)
Inductive proximity sensor
d)
Photodiode
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