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1. Self generating type transducers are _____ transducers.
a) Active
b) Passive
c) Secondary
d) Inverse
Ans : (a)
2. The transducers that converts the input signal into the output signal, which
is a discrete function of time is known as ______ transducer.
a) Active
b) Analog
c) Digital
d) Pulse
Ans : (c)
3. A transducer that converts measurand into the form of pulse is called
a) Active transducer
b) Analog transducer
c) Digital transducer
d) Pulse transducer
Ans : (d)
4. Which of the following is a digital transducer?
a) Strain gauge
b) Encoder
c) Thermistor
d) LVDT
Ans : (b)
5. Strain gauge, LVDT and thermocouple are examples of
a) Active transducers
b) Passive transducers
c) Analog transducers
d) Primary transducers
Ans : (c)
6. An inverse transducer is a device which converts
a) An electrical quantity into a non electrical quantity
b) Electrical quantity into mechanical quantity
c) Electrical energy into thermal energy
d) Electrical energy into light energy
Ans : (a)
7. A strain gauge is a passive transducer and is employed for converting
a) Mechanical displacement into a change of resistance
b) Pressure into a change of resistance
c) Force into a displacement
d) Pressure into displacement
Ans : (a)
8. Resolution of a transducer depends on
a) Material of wire
b) Length of wire
c) Diameter of wire
d) Excitation voltage
Ans : (c)
9. The sensitivity factor of strain gauge is normally of the order of
a) 1 to 1.5
b) 1.5 to 2.0
c) 0.5 to 1.0
d) 5 to 10
Ans : (b)
10. In wire wound strain gauges, the change in resistance is due to
a) Change in diameter of the wire
b) Change in length of the wire
c) Change in both length and diameter
d) Change in resistivity
Ans : (c)
11. Bonded wire strain gauges are
a) Exclusively used for construction of transducers
b) Exclusively used for stress analysis
c) Used for both stress analysis and construction of transducer
d) Pressure measurement
Ans : (c)
12. Certain type of materials generates an electrostatic charge or voltage when
mechanical force is applied across them. Such materials are called
a) Piezo-electric
b) Photo-electric
c) Thermo-electric
d) Photo-resistive
Ans : (a)
13. Quartz and Rochelle salt belongs to _______ of piezo-electric materials
a) Natural group
b) Synthetic group
c) Natural or Synthetic group
d) Fiber group
Ans : (a)
14. Which of the following are piezo electric substances?
1. Barium titanate
2. Lead titanate
3. Lead Zirconate
4. Cadmium and sulphate
Choose correct one
a) 1,2 and 4
b) 1,3and4
c) 1,2and 3
d) 2,3and 4
Ans : (c)
15. Piezo-electric transducers are
a) Passive transducers
b) Inverse transducers
c) Digital transducers
d) Pulse transducers
Ans : (b)
16. Piezo – electric transducers work when we apply ________ to it.
a) Mechanical force
b) Vibrations
c) Illuminations
d) Heat
Ans : (a)
17. Piezo electric crystal can produce an emf
a) When external mechanical force is applied to it
b) When radiant energy stimulates the crystal
c) When external magnetic field is applied
d) When the junction of two such crystals are heated
Ans : (a)
18. The draw backs of strain gauges are
S1: Low fatigue life
S2: They are expensive, brittle and sensitive to temperature
S3: Poor linearity
Choose the correct one
a) S1 and S2
b) S2 and S3
c) S1 and S3
d) S1 only
Ans : (b)
19. LVDT windings are wound on
a) Steel sheets
b) Aluminium
c) Ferrite
d) Copper
Ans : (c)
20. The size of air cored transducers in comparison to the iron core parts is
a) Smaller
b) Larger
c) Same
d) Unpredictable
Ans : (b)
21. The principle of operation of LVDT is based on the variation of
a) Self inductance
b) Mutual inductance
c) Reluctance
d) Permanence
Ans : (b)
22. LVDT is an/a _______ transducer
a) Magneto-strict ion
b) Inductive
c) Resistive
d) Eddy current
Ans : (B)
23. Which of the following can be measured with the help of piezo electric
crystal?
a) Force
b) Velocity
c) Sound
d) Pressure
Ans : (a)
24. S1: Transducer is a device which converts physical into electrical quantity
S2: Transducer is also called as sensor.
a) S1 is true & S2 is false
b) S2 is true & S1 is false
c) Both S1 & S2 are true
d) Both S1 & S2 are false
Ans (b)
27. In a LVDT, the two secondary voltages
a) Are independent of the core position
b) Vary unequally depending on the core position
c) Vary equally depending on the core position
d) Are always in phase quadrature
Ans : (b)
28. Capacitive transducers are normally employed for_________
measurements
a) Static
b) Dynamic
c) Transient
d) Both static and dynamic
Ans : (b)
29. Match the following
1. EEG A. Diagnostic tool for heart alignment
2. ECG B. Diagnostic tool for brain alignment
3. Sphygmo-manometer C. Instrument used for measuring blood pressure
4. Stethoscope D. instrument used to hear pulse/heart beat
Choose the correct one
a) 1- B, 2 – A, 3 – C, 4 – D
b) 1 – B, 2 – A, 3 – D, 4 – C
c) 1- C, 2 – A, 3 – B, 4 – D
d) 1 – A, 2 – B, 3 – C, 4 – D
Ans : (a)
30. Pick the correct statement regarding functions of a transducer
S1: Sense the magnitude, change in & / or frequency of same measurand
S2: To provide electrical output that furnishes accurate, quantitative data
about the measurand
a) S1 is true & S2 is false
b) S2 is true & S1 is false
c) Both S1 & S2 are true
d) Both S1 & S2 are false
Ans : (c)
31. The transducers which requires an external power and their output is a
measure of some variation such as resistance, inductance, capacitance etc., are
called as
a) Active transducer
b) Primary sensor
c) Passive transducer
d) Self generating transducer
Ans : (c)
32. The principle of operation of variable resistance transducer is
a) Deformation leads to change in resistance
b) Displacement of a contact slider on a resistance
c) Coupling of two coils changes with displacement
d) Movement of magnetic field produces variation in resistance of material
Ans : (b)
33. The application of LVDT is
a) Joint motion
b) Finger movement
c) Limb movement
d) Heart wall motion
Ans : (c)
34. Venturi is associated with
a) Venous blood pressure
b) Digital plethysmography
c) Dialysate flow in artificial kidney
d) Blood flow in heart lung machine
Ans : (d)
35. Pressure transducer for measuring blood pressure is
a) Strain gauge transducer only
b) Strain gauge or capacitive transducer
c) Resistive transducer
d) Fiber optic transducer
Ans : (b)
36. The change in resistance of a metal wire owing to strain is due to
S1: Change in dimension of wire expressed by factor (1-2µ)
S2: Change in resistance ?
a) S1 is true & S2 is false
b) S2 is true & S1 is false
c) Both S1 & S2 are true
d) Both S1 & S2 are false
Ans : (b)
37. In foil strain gauge the thickness of foil varies from
a) 2.5 micron to 6 micron
b) 25 micron (or) less
c) 25 micron to 60 micron
d) 2.5 micron to 5 micron
Ans : (a)
38. Photo conductive cell consists of a thin film of
a) Quartz
b) Lithium sulphate
c) Barium titanate
d) Selenium
Ans : (d)
39. S1: In multimode fiber optics, intensity modulating schemes can be
employed.
S2: Schemes using polarizing techniques need birefringent fiber.
a) S1 is true and S2 is false
b) Both S1 and S2 are true
c) S1 is false and S2 is true
d) Both S1 and S2 are false
ans (b)
40. Test electrode is also known as
a) Indicator electrode
b) Reference electrode
c) Second electrode
d) Primary electrode
Ans : (a)
41. Most commonly used indicator electrode is
a) Calomel electrode
b) Silver electrode
c) Silver – Silver chloride electrode
d) Glass electrode
Ans : (d)
42. _________ is the example of photo emissive cell.
a) LDR
b) Photo diode
c) Photo transistor
d) Photo multiplier
Ans : (a)
43. pH value of venous blood is
a) 7.30
b) 7.40
c) 7.35
d) 7.45
Ans : (c)
44. Silver chloride electrode is used as a reference electrode due to its
a) Large half cell potential
b) Stable half cell potential
c) Stable resting potential
d) Stable action potential
Ans : (b)
45. The capacitance microphone is used for the detection of
a) Heart rate
b) Blood flow
c) Heart sound
d) Foot pressure
Ans : (c)
46. In a graded index fiber, the total reflected light takes a _________
a) Straight line path
b) Parabolic path
c) Elliptical path
d) Circular path
Ans (b)
47. ________ fiber is used in interferometric instruments.
a) Monomode
b) Multimode
c) Birefringent
d) Coated
Ans (a)
48. Fiber optic sensor can be used to sense _________
a) Displacement
b) Power
c) Current
d) Resistance
Ans (a)
49. Photo multiplier consists of
a) 1 Photo emissive cathode & 2 dynodes
b) 2 Photo emissive cathodes & 2 dynodes
c) 2 Photo emissive cathodes & 1 dynode
d) 1 Photo emissive cathode & 1 dynode
Ans : (a)
50. The resistance of LDR ______ when exposed to radiant energy.
a) Remains unaltered
b) Increases
c) Reaches maximum
d) Decreases
Ans : (d)
51. The more correct a senor can measure, the more ________ it is:
1. Accurate
2. Precise
3. Scaled
4. Extent
Correct answer: 1. Accurate
52. The smallest change which a sensor can detect is termed:
1. Accuracy
2. Precision
3. Resolution
4. Scale
Correct answer: 3. Resolution
53. The thermistor whose resistance increases by increasing temperature:
1. NTC Thermistor
2. PTC Thermistor
3. None of these
4. Any of these
Correct answer: 2. PTC Thermistor
54. Sound to electrical energy transducer:
1. Microphone
2. AFR
3. Tactile sensor
4. Pellistor
Correct answer: 1. Microphone
55. Which type of sensor is used to measure the distance between the vehicle
and other objects in its environment:
1. Ultrasonic sensor
2. Tactile sensor
3. Motion sensor
4. None of these
Correct answer: 1. Ultrasonic sensor
Self-driving cars are loaded with ultrasonic sensors that measure the distance
between vehicles and other objects.
56. Which of following is the correct statement about digital sensors:
1. Digital sensors provide information on all possible values within specified limit
2. Digital sensors are limited to a finite set of values
Correct answer: 1. Digital sensors provide information on all possible values
within specified limit
57. You are driving your car and in the middle of the road, the engine loses
power. Which of the following is the probable reason:
1. PCM is getting incorrect information from the camshaft position sensor
2. The ultrasonic sensor of the car is faulty
3. Both of these
4. None of these
Correct answer: 3. Both of these
58. DHT22 sensor is used to sense:
1. Obstacles
2. Resistance
3. Position
4. Humidity
Correct answer: 4. Humidity
59.) The detectors used in optical sensors is
a. Photodiodes
b. Phototransistors
c. Laser
d. Only (a) and (b)
e. All the above
ANSWER: Only (a) and (b)
60) Optical sensors used for the displacement measurement works on the principal that
a. Intensity of light increases with distance
b. Intensity of light decreases with distance
c. Intensity of light remains constant with distance
d. Intensity of light increases with time
ANSWER: Intensity of light decreases with distance
61) Capacitance sensor can measure very small displacement. It can be formed by varying
a. Separation
b. Area
c. Permittivity
d. Either (a) or (b) or (c)
ANSWER: Either (a) or (b) or (c)
62) Resolver works on the principal of mutual inductance variation. It is mainly used for the measurement of
a. Linear displacement
b. Non - linear displacement
c. Rotary motion
d. All of these
ANSWER: Rotary motion
63) In rotary variable differential transformer, the mutual inductance between the primary and secondary coils
varies
a. Linearly with the angular displacement
b. Non - linearly with the angular displacement
c. Linearly with the linear displacement
d. Non - linearly with the linear displacement
ANSWER: Linearly with the angular displacement
64) LVDT which is an instrument for the measurement of displacement, works on the principal of
a. Linear inductance
b. Non - linear inductance
c. Mutual inductance
d. Linear capacitance
ANSWER: Mutual inductance
65) Potentiometer is used for the measurement of
a. Linear displacement
b. Angular displacement
c. Non - linear displacement
d. Only (1) and (2)
e. All the above
ANSWER: Only (1) and (2)
66) The displacement measuring instruments is / are
a. Potentiometer
b. LVDT
c. RVDT
d. All of these
ANSWER: All of these
67. A junction / joint of two dissimilar metal is called _______.
a. reference point b. solder joint c. thermocouple d. all are correct
Answer: c
68. A thermocouple of two different metals has two junctions, first junction is on low
temperature and second junction is on high temperature. True / False
Answer: True
69. The first junction of thermocouple is called __________.
a. hot b. sensing c. cold d. a & b are correct
Answer: d
70. The cold junction of thermocouple is also called Reference Junction. True /
False
Answer: True
71. _______ produced in the thermocouple due to difference of junction temperature.
a. E.M.F b. Current c. Resistance d. a & b are correct
Answer: d
72. An effective galvanometer is used to measure e.m.f in thermocouple.
True / False
Answer: True
73. What characteristics have found in the thermocouple materials.
a. control the environmental effect b. control temperature variations c. more sensitive to measure exact value d. all are correct
Answer: d
74. Thermocouple works on the principle of Seebeck Effect. True / False
Answer: True
75. The temperature range of thermocouple materials are ________.
a. 0º C → 190º C
b. 0º C → 270º C c. 270º C → 2700º C d. 270º C → 370º C
Answer: c
76. The alloy of copper and nickel is called constantan. True / False
Answer: True
77. ______ alloys are used for more than 1400ºc.
a. Platinum b. Iron c. Platinum Iridium d. a & c are correct
Answer: d
78. The required output from thermocouple can get by connecting in series or parallel
groups.
True / False
Answer: True
79. The series & parallel groups of thermocouples are called ________.
a. constantan b. thermodynamics c. thermopiles d. none is correct
Answer: c
80. An e.m.f produced in the thermocouple does not depend on the length of metal
wires.
True / False
Answer: True
81. How to protect the metals of thermocouple from the oxidation process ?
a. enclosed inside tubes b. connect intermediate metal c. keep on room temperature d. all are correct
Answer: a
82. Pyrometer is a thermocouple used in the industrial furnaces for the measurement of
temperature.
True / False
Answer: True
83. Thermocouples are used in the relays for the ______ of power system.
a. protection b. maintenance c. repair d. all are correct
Answer: a
84. Sometimes, thermocouples are used to operate the small AC induction motors. True
/ False
Answer: True
85. ________ size thermocouples are used to measure the internal temperature of human
body in medical work.
a. Small b. Large c. Medium d. Normal
Answer: a
86. In the industries, thermocouples are used upto 1450ºc. True / False
Answer: True
87. Resistance temperature detector is ___________
a) a electrical transducer
b) a mechanical transducer
c) a chemical transducer
d) a physical transducer
Answer: a
Explanation: Resistance temperature detector is an electrical transducer. It is used for measuring
the variation in temperature. It is also known as a resistance thermometer.
88. Relation between temperature and resistance of a conductor is ________
a) Rt = Rref [1+t]
b) Rt = Rref [1+α∆t]
c) Rt = Rref [1-αt]
d) Rt = Rref [1-t]
Answer: b
Explanation: The relationship between temperature and resistance of a conductor is given by
Rt = Rref [1+α∆t]
where, Rt is the resistance of the conductor at t°C.
Rref is the resistance of the conductor at reference temperature
α is the temperature coefficient of resistance
∆t is the difference between the temperature being measured and the reference temperature.
89. Sensing element in the thermometer must provide ________
a) small change in resistance
b) no change in resistance
c) large change in resistance
d) infinite change in resistance
Answer: c
Explanation: The sensing element in a thermometer must give a large change in the resistance for
a given change in the temperature.
90. Platinum is used for industrial applications because ________
a) it is cheap
b) it is available readily
c) it is a noble metal
d) it gives accurate measurements
Answer: d
Explanation: In industrial applications, platinum is used due to its accuracy in providing
measurements. It is also reproducible. Platinum element can be used for the measurement of
temperatures of about 1000 K.
91. Resistance thermometer provides the change in electrical resistance.
a) True
b) False
Answer: a
Explanation: A resistance thermometer provides a change in the electrical resistance with respect
to a variation in the temperature. Basically resistance thermometers work on the principle of
change in the electrical resistance with variation in the temperature.
92. If the sensing element is large, then less amount of heat is required.
a) True
b) False
Answer: b
Explanation: When the sensing element in a resistance thermometer is small in size, then less
quantity of heat is required to raise the temperature. Platinum, nickel and copper are the
commonly used metals for measuring temperature.
93. Most metallic conductors have a ________
a) neutral temperature coefficient of resistance
b) negative temperature coefficient of resistance
c) positive temperature coefficient of resistance
d) zero temperature coefficient of resistance
Answer: c
Explanation: In general metallic conductors have a positive temperature coefficient of resistance.
The resistance increases with an increase in temperature.
94. In a temperature sensing element ________
a) low value of α is required
b) infinite value of α is required
c) α must be zero
d) high value of α is required
Answer: d
Explanation: In order to achieve a large change in the value of resistance for a small change in
the value of temperature, high value of α is required. Change in resistance is measured through a
Wheatstone’s bridge.
95. Nickel and its alloys can be used over a temperature range of ________
a) 100 to 450 K
b) 10 to 50 K
c) 0 to 25 K
d) 5 to 15 K
Answer: a
Explanation: Temperature sensors constructed using nickel and its alloys can be used in the
temperature range of 100 to 450 K. Compared to platinum, they are less expensive. They have a
comparatively higher temperature coefficient that increases with temperature.
96. How can corrosion be prevented in a resistance thermometer?
a) by immersing the setup in oil
b) by enclosing the elements in a glass tube
c) by using guard rings
d) by painting the elements
Answer: b
Explanation: Corrosion can be eliminated in a resistance thermometer by enclosing the elements
in a protective tubular glass made of pyrex, quartz or crystal depending upon the temperature
range.
97. Which devices measures gases or liquid?
a) Proximity sensor
b) Pressure sensor
c) Temperature sensor
d) Touch sensor
Answer: b
Explanation: The pressure sensor is a device for pressure measurement of gases or liquid.
Pressure is an expression of the force required to stop a fluid from expanding.
98. Which sensor measures the pressure relative to perfect vacuum?
a) Absolute pressure sensor
b) Gauge pressure sensor
c) Vacuum pressure sensor
d) Differential pressure sensor
Answer: a
Explanation: Pressure sensor can be classified in terms of pressure ranges they measure,
temperature ranges of operation, and most importantly the type of pressure they measure.
Absolute pressure sensor is a sensor that measures the pressure relative to perfect vacuum.
99. Which sensor measure the pressure relative to atmospheric pressure?
a) Absolute pressure sensor
b) Gauge pressure sensor
c) Vacuum pressure sensor
d) Differential pressure sensor
Answer: b
Explanation: This sensor measures the pressure relative to atmospheric pressure. A tire pressure
gauge is an example of gauge pressure measurement; when it indicates zero, then the pressure it
is measuring is the same as the ambient pressure.
100. Barometer is which type of sensor________
a) Pressure sensor
b) Touch sensor
c) Temperature sensor
d) Humidity sensor
Answer: a
Explanation: Barometers and pressure gauges are the most popular sensors used for IOT
ecosystem. Barometers are an absolute help in weather forecasting as in accurately measures the
ambient air.
101. Touch screen devices use which sensor?
a) Touch sensor
b) Temperature sensor
c) Humidity sensor
d) Pressure sensor
Answer: d
Explanation: Pressure sensors are ultimate solution for IOT as they can be used in various areas
such as touch screen devices.
102. What is the stability of pressure sensor?
a) +/-0.75% FS
b) +/-0.5% FS
c) +/- 0.35% FS
d) +/-0.125% FS
Answer: c
Explanation: One of the main feature of pressure sensor is its stability which is +/-0.35% FS(Full
Scale).
103. What is the operating voltage of pressure sensor?
a) 3.5v
b) 1.5v
c) 5v
d) 3v
Answer: d
Explanation: The pressure sensor has and absolute pressure of 1.2 bar to 10 bar. The typical
operating system is 3v. With a supply voltage of 5v they offer sensitivities of between 15 mV/bar
and 80 mV/bar, depending on type.
104. The feature of c39 is its low insertion height.
a) True
b) False
Answer: a
Explanation: The c39 is especially suitable for IOT and consumer applications. One feature of
c39 is its low insertion height of just 0.24mm, which makes the low-profile MEMS pressure
sensor die ideal for applications in smartphones and wearables.
105. What is the absolute pressure of c39?
a) 2.0 bar
b) 1.5 bar
c) 1.2 bar
d) 1.35 bar
Answer: c
Explanation: The c39 is designed for an absolute pressure of 1.2 bar and, like the c33 series,
offers long-term stability of +/-0.35% FS.
106. Which pressure standard is used for gauge?
a) Dead-weight tester
b) Manometer
c) Pressure switches
d) Stain gauge pressure sensor
Answer: b
Explanation: A mercury manometer is a simple pressure standard and may be used for gauge,
differential, and absolute measurements with a suitable reference.
107. Pressure measured relative to perfect vacuum is termed as ______
a) Absolute Pressure Measurement
b) Differential Pressure Measurement
c) Gauge Pressure Measurement
d) Both Absolute and Differential
Answer: a
Explanation: Pressure measured relative to perfect vacuum is termed as Absolute Pressure
Measurement. Perfect vacuum is a condition where there is no matter present in the atmosphere
and hence nil air pressure exits in that region.
108. In which pressure measurement, pressure of two distinct positions are compared?
a) Absolute Pressure Measurement
b) Differential Pressure Measurement
c) Gauge Pressure Measurement
d) Both Absolute and Differential
Answer: b
Explanation: In differential pressure measurement, pressure of two distinct positions are
compared. For example, pressure difference calculated by measuring it at different floors of a tall
building will give us differential pressure.
109. ______ can be defined as a subtype of differential pressure measurement.
a) Absolute Pressure Measurement
b) Differential Pressure Measurement
c) Gauge Pressure Measurement
d) Both Absolute and Differential
Answer: c
Explanation: Gauge Pressure Measurement is defined as subtype of differential pressure
measurement where we compare pressure pressure at any point to the current atmospheric
pressure. Gauge Pressure measurement is used in applications like tire pressure of blood pressure
measurement.
110. The computer devices and smart phones that have _______ with pressure sensor.
a) Automotive Industry
b) Industrial
c) Aviation
d) Touch screen
Answer: d
Explanation: The computer devices and smart phones that have touch screen display with
pressure sensor. Whenever slight pressure is applied on touch screen through a finger, the sensor
determines where it has been applied.
111. In which place the pressure sensor is needed for monitoring gases and their partial
pressures.
a) Touch screen
b) Automotive Industry
c) Industrial
d) Aviation
Answer: c
Explanation: Pressure sensors are used to monitor gases and their partial pressures in industrial
units so that the large chemical reactions take place in precisely controlled environmental
conditions.
112. Pressure is the _________
a) force per unit area
b) mass per unit area
c) force per unit volume
d) mass per unit volume
Answer: a
Explanation: Pressure at a point is defined as the force acting per unit area. It is measured at
some given point over a surface.
113. Pressure measurement devices make use of ________
a) non-elastic member
b) elastic member
c) bendable member
d) non-bendable member
Answer: b
Explanation: Pressure sensors employ elastic member at the input stage to detect or sense the
pressure variations. Elastic members are usually of various forms and convert the pressure into
mechanical displacement.
114. Output of electrical transducer is ________
a) inversely proportional to displacement
b) proportional to square of displacement
c) proportional to displacement
d) constant
Answer: c
Explanation: The output of an electrical transducer is proportional to displacement. Displacement
is measured using electrical transducers.
115. In general how many pressure sensitive devices are there?
a) 6
b) 20
c) 10
d) 4
Answer: d
Explanation: Usually there are four pressure sensitive devices. They are as follows:
• Diaphragms
• Capsule
• Bourdon tube
• Bellows.
116. Diaphragms in a pressure sensor are of ________
a) 2 types
b) 5 types
c) 10 types
d) 20 types
Answer: a
Explanation: Generally in a pressure sensor we have four pressure sensitive devices. Diaphragm
is a type of a pressure sensitive device. They are of two types:
• Flat type
• Corrugated type.
117. Temperature is the only consideration while selecting a diaphragm.
a) True
b) False
Answer: b
Explanation: While selecting a suitable diaphragm for sensing the pressure the following factors
are considered important.
• Temperature range
• Shock and vibration
• Frequency response requirements.
118. Capsule type of pressure sensor consists of ________
a) 6 dissimilar diaphragms
b) 4 identical diaphragms
c) 2 identical diaphragms
d) 8 dissimilar diaphragms
Answer: c
Explanation: Capsule is a type of a pressure sensor. It comprises of two identical annular
corrugated metal diaphragms that are sealed together to form a shell like enclosure.
119. Bourdon tubes are ________
a) very highly sensitive to shock
b) not sensitive to shock
c) less sensitive to shock
d) more sensitive to shock
Answer: d
Explanation: Bourdon tube is one type of pressure sensor. It is more sensitive to shock and
vibrations as compared to diaphragms. Bourdon tube can be used for precision measurements of
pressure up to 3 MN/m2.
120. Bellows have 5 to 20 convolutions.
a) True
b) False
Answer: a
Explanation: Bellow is a type of pressure sensor. They have about 5 to 20 convolutions. The
number of convolutions depends on the pressure range, displacement, and operating temperature.
121. Sensitivity in a capsule is increased ________
a) through parallel connection of capsules
b) through series connection of capsules
c) through series and parallel connection of capsules
d) by not connecting them at all
Answer: b
Explanation: Capsule is a type of pressure sensor. In a capsule, we can increase the sensitivity by
connecting two or more capsules in series. The resultant displacement is equal to the number of
capsules.
122. Which of the following is not a characteristic of the immobilized enzymes?
a) They cannot be re-used
b) It produces reproducible results
c) Stability exists
d) Same catalytic activity is present for number of analysis
Answer: a
Explanation: Immobilized enzymes can be reused. This ensures that the same catalytic activity is
present for a number of analyses.
123. Which of the following is the physico-chemical component?
a) Enzymes
b) Anti-bodies
c) Transducer
d) Cells or tissues
Answer: c
Explanation: Transducer is referred to as the physico-chemical component. Enzymes and anti-
bodies are biological components.
124. An example of biosensor, urea electrode makes use of which of the following
electrodes?
a) Carbon dioxide electrode
b) Ammonia electrode
c) Fluoride electrode
d) Ammonium electrode
Answer: d
Explanation: An example of biosensor, urea electrode makes use of the ammonium electrode. A
urease membrane is also present.
125. In glucose electrode, glucose oxidase has been coupled to an electrode by which of the
following materials?
a) Ferrocene derivatives
b) Urease
c) Polyacrylamide
d) Biochips
Answer: a
Explanation: In glucose electrode, glucose oxidase has been coupled to an electrode by using
ferrocene derivatives. It is used to measure blood glucose in diabetic patients.
126. Biosensors measure glucose concentrations between which of the following ranges?
a) 10-1
to 10-2
M
b) 10-2
to 10-4
M
c) 10-1
to 10-4
M
d) 10-1
to 10-7
M
Answer: d
Explanation: Biosensors measure glucose concentrations between 10-1
to 10-7
M. It is linear in
the range of 10-2
to 10-4
M.
127. Transducers employed in the bulk of enzyme electrodes use which of the following
principles?
a) Amperometric
b) Optical
c) Magnetic
d) Colorimetric
Answer: a
Explanation: Transducers employed in the bulk of enzyme electrodes use amperometric
principle. It may also use the potentiometric principle.
128. Which of these biosensors use the principle of heat released or absorbed by a reaction?
a) Potentiometric biosensor
b) Optical biosensors
c) Piezo-electric biosensors
d) Calorimetric biosensors
Answer: d
Explanation: Calorimetric biosensors use the principle of heat released or absorbed by a reaction.
The heat is measured to determine the concentration.
129. Which of the following biosensors use the movement of electrons produced during
redox reactions?
a) Amperometric biosensor
b) Potentiometric biosensors
c) Piezo-electric biosensors
d) Optical biosensors
Answer: a
Explanation: Amperometric biosensor uses the movement of electrons produced during redox
reactions. Redox reactions involve both reduction and oxidation.
130. Nanoscopic optical biosensors have fast response time but the sensitivity is reduced.
a) True
b) False
Answer: b
Explanation: Nanoscopic optical biosensors have a fast response. They also have excellent
biochemical sensitivity.
140. Given below is the diagram of biosensor. Identify the unmarked component.
a) Microprocessor
b) Filter
c) Transducer
d) A/D converter
Answer: c
Explanation: The biological signals must be converted into electrical signals. Transducers are
used for this purpose.
141. In glucose sensor, a measure of change in oxygen value is a measure of the glucose
value.
a) True
b) False
Answer: a
Explanation: In glucose sensor, a measure of change in oxygen value is a measure of the glucose
value. It is then processed and displayed.
142. For constructing the glucose sensor, which of the following is used as a gel?
a) Urea
b) Urease
c) Acrylamide
d) Polyacrylamide
Answer: d
Explanation: For constructing the sensor, polyacrylamide is used as the gel. It is used to entrap
the glucose oxidase.
143. _______________ converts biochemical events into measurable signals.
a) amplifier
b) opamp
c) rectifier
d) transducer
Answer: d
Explanation: Transducers convert biochemical events into measurable signals. They provide the
means for detecting the biochemical changes inside the body. Particularly biosensors are
employed for this purpose.
144.Home blood glucose sensor works on which principle?
a) electro-physiological
b) electrochemical
c) physio-chemical
d) chemical
Answer: b
Explanation: Home blood glucose detection sensor works on the principle of electrochemical.
The biosensor in this instrument relies upon enzymes that recognise and catalyze reactions of
glucose with the generation of redox – active species that are detected electrochemically.
THERMOCOUPLE MCQS LINK
https://mcqslearn.com/sat/physics/thermocouple-thermometer-mcqs.php
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