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
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1. Self generating type transducers are transducers.
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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 ___________