Transducrs MCQ Questions

Transducrs MCQ Questions
1. 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)

2. 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)

3. The application of LVDT is
a) Joint motion
b) Finger movement
c) Limb movement
d) Heart wall motion
Ans : (c)

4. 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)

5. 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)

6. 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 ∆ρ
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)

7. 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)

8. In variable capacitance transducer, C=
a) kξo/Ad
b) kξoA/d
c) kξod/A
d) Aξo/kd
Ans : (b)

9. Photo conductive cell consists of a thin film of
a) Quartz
b) Lithium sulphate
c) Barium titanate
d) Selenium
Ans : (d)



10. Test electrode is also known as
a) Indicator electrode
b) Reference electrode
c) Second electrode
d) Primary electrode
Ans : (a)

11. Most commonly used indicator electrode is
a) Calomel electrode
b) Silver electrode
c) Silver – Silver chloride electrode
d) Glass electrode
Ans : (d)

12. _____________ is the example of photo emissive cell
a) LDR
b) Photo diode
c) Photo transistor
d) Photo multiplier
Ans : (a)

13. pH value of venous blood is
a) 7.30
b) 7.40
c) 7.35
d) 7.45
Ans : (c)

14. 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)

15. The capacitance microphone is used for the detection of
a) Heart rate
b) Blood flow
c) Heart sound
d) Foot pressure
Ans : (c)

16. Inductance of a coil is given by L =
a) N2R
b) N2 + R
c) N2 - R
d) N2 / R
Ans : (d)

17. ______________ is called as linistor when it provides a linear change in resistance with respect to temperature
a) Thermistor
b) Thermocouple
c) Thermometer
d) Thermo resistive transducer
Ans : (a)

18. 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)

19. Selenium photo cells are sensitive to the visible spectrum of
a) 400 – 700 mµ
b) 350 – 700 mµ
c) 300 – 700 mµ
d) 450 – 700 mµ
Ans : (c)

20. The resistance of LDR ________________ when exposed to radiant energy.
a) Remains unaltered
b) Increases
c) Reaches maximum
d) Decreases
Ans : (d)

21. Respiratory volume is measured using
a) Myograph
b) Pneumograph
c) Spiro meter
d) Goniometer
Ans : (b)

22. Match the following
1. Sensitivity A. Ability to detect very small change
2. Stability B. Ability to produce constant output
3. Precision C. Measure of reproducibility
4. Accuracy D. Closeness to true value
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 : (d)

23. Piezo electric materials have ___________ resistivity
a) Zero
b) Infinite
c) Finite
d) Null
Ans : (c)

24. Dummy gauge is mounted on the opposite arm of the active gauge to cancel output differentials due to
a) Temperature variation of resistance
b) Pressure variation of resistance
c) pH concentration variation
d) Change in blood flow
Ans : (a)

25. For fiber optic sensors,
a) Single mode transmission is used
b) Multimode transmission is used
c) Both single mode and multimode transmission is used
d) Transmission is not used
Ans (a)

26. One of the combination of materials used for optical fibers are ___________
a) Copper core and glass cladding
b) Glass core and aluminum cladding
c) Glass core and plastic cladding
d) Plastic core and glass cladding
Ans (c)

27. The optical sensors may be classified as _________
a) Intensity and intrinsic types
b) Interferometric and extrinsic types
c) Intensity or intrinsic type and Interferometric or extrinsic types
d) Only extrinsic type
Ans (c)

28. 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)

29. ____________ fiber is used in interferometric instruments.
a) Monomode
b) Multimode
c) Birefringent
d) Coated
Ans (a)

30. Fiber optic sensor can be used to sense _________
a) Displacement
b) Power
c) Current
d) Resistance
Ans (a)


31. 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)