Analytical instruments MCQ Quiz Hub

1. Hall Effect is clearly visible in _______
Pure conductors
Semiconductors
Super conductors
Metals

2. Force exerted by magnetic field in Hall Effect transducers is ________
Lorentz force
Hall Effect force
Magnetic force
Electric force

3. Which of the following represents correct expression for Lorentz force?
BeV
BV
eV
B

4. Which of the following represents the output of Hall Effect transducer?
Hall potential
Emf
Applied voltage
Lorentz Voltage

5. Hall Effect transducers attain equilibrium instantaneously.
True
False
all of the above
None of the mentioned

6. Hall Effect transducer can be used to measure ______
Magnetic field
Angular displacement
Linear displacement
All of the mentioned

7. Which of the following can be measured using tachometers?
Angular speed
Linear speed
Acceleration
Vibration

8. Two phase induction motor can be used as AC tachometers.
True
False
all of the above
None of the mentioned

9. Electrodynamic vibration transducers are based on _______
Magnetostriction
Electromagnetic induction
Self inductance
None of the mentioned

10. Which of the following is used for measuring emf between plates of transducers?
Low impedance voltmeter
High impedance voltmeter
Any voltmeter
None of the mentioned

11. Which of the following is applicable for the electromagnetic flow meter?
It causes obstruction to flow
It doesn’t cause obstruction t flow
It cannot be used in slurries
None of the mentioned

12. Which of the following quantities are sensitive to electromechanical flow meters?
Viscosity
Density
Temperature
None of the mentioned

13. Which of the following represents the expression of output from electromechanical flow meter?
BDV
BV
BD
BD2V

14. Electromechanical system can be used for measuring vibration.
True
False
all of the above
None of the mentioned

15. Which of the following is correct for AC and DC tachometers?
Sensitivity if AC tachometer is very high
Sensitivity of DC tachometer is very high
Sensitivity of both are equal
None of the mentioned

16. Which of the following is correct for the tachometer system?
First order system
Second order system
Third order system
Unpredictable

17. Photoelectric devices are sensitive to all wavelength.
True
False
all of the above
None of the mentioned

18. In photo emissive transducers, electrons are attracted by ______
Cathode
Anode
Grid
Body

19. Why inert gas is used in photo electric transducers?
To increase efficiency
To increase sensitivity
To increase robustness
None of the mentioned

20. Which of the following quantities are insensitive to solid state semiconductor photoelectric transducers?
X ray
Gamma ray
Alpha and beta rays
None of the mentioned

21. LDR’s are also called ________
Photo voltaic cell
Photo resistive cell
Photo emissive cell
All of the mentioned

22. Photo resistive cells are _________
Active device
Passive device
Insulating device
None of the mentioned

23. Which of the following materials can be used as photoconductive transducer?
Selenium
Silicon
Germanium
All of the mentioned

24. Semiconductor layer using silicon and germanium is known as ______
Photo diodes
Photo junction diodes
Photo material
Photo sensitive materials

25. Which of the following are used to form photo transistors?
Two photo diodes
Three photo diodes
Normal diodes
None of the mentioned

26. Photo transistor is a three terminal device.
True
False
all of the above
None of the mentioned

27. Which of the following are nuclear radiations?
Beta
Alpha
Gamma
All of the mentioned

28. Which of the following has a helium nucleus?
Alpha particle
Beta particle
Gamma particle
All of the mentioned

29. Which of the following potential is applied to the grid?
+ve potential
–ve potential
Neutral potential
None of the mentioned

30. Which of the following is correct for the ionization transducer?
Grid current decrease constantly
Grid current Increases constantly
Grid current is made constant
None of the mentioned

31. Cold cathode ionization vacuum gauges are more accurate than hot cathode ionization vacuum gauges.
True
False
all of the above
None of the mentioned

32. Which of the following cannot be measured using ionization transducer?
Vacuum pressure
Gaseous pressure
Displacement
None of the mentioned

33. Which of the following applications ionization chamber is used?
For detection of nuclear radiation
For better stability
For storing inert gas
For ionizing gas

34. Which of the following is a radioactive vacuum gauge?
Cold cathode gauge
Hot cathode gauge
Non ionization gauge
None of the mentioned

35. Which of the following represents a mass absorption coefficient?
Ratio of linear absorption coefficient to density
Product of absorption coefficient and density
Linear absorption coefficient
Product of linear absorption coefficient and mass

36. Which of the following is correct for a digital transducer?
Measures digital quantity only
Gives digital output
Doesn’t measure analog input
None of the mentioned

37. LDE is used for measuring __________
Linear acceleration
Angular acceleration
Linear displacement
Linear acceleration

38. Datums are used for ______
Obtaining digital output
Converting analog data to digital data
Storing data
Displaying output

39. Absolute encoders require data.
True
False
all of the above
None of the mentioned

40. Which of the following is not an encoder?
Optical encoders
Magnetic encoders
Angular digital encoders
None of the mentioned

41. Why positive feedback is used in a pressure transducer?
To improve stability
To maintain stability constant
To maintain vibratory motion
None of the mentioned

42. VDP is used for measuring pressure _____
Less than 1 atmosphere
Between 1 and 100 atmosphere
Above 1000 atmosphere
All of the mentioned

43. In vibrating tube gas transducer, Pressure difference across wall is varying.
True
False
all of the above
None of the mentioned

44. In vibrating string transducer output frequency is depended on the length of spring by ________
Direct proportionality
Inverse proportionality
Equal
None of the mentioned

45. Density of flowing liquid can be measured using________
Vibrating tube transducer
Vibrating cylinder transducer
Both vibrating tube and cylinder transducer
None of the mentioned

46. Which of the following electrode/s is/are used for measuring electrode potential?
Reference electrode
Indicator electrode
Both reference and indicator electrode
None of the mentioned

47. Which of the following conversion take place in the galvanic cell and electrolytic cell?
Chemical energy to electrical energy without power supply
Electrical energy to chemical energy without power supply
Mechanical energy to chemical energy without power supply
None of the mentioned

48. Which of the following can be used by NHE?
Reference electrode
Indicator electrode
Both reference and indicator electrode
None of the mentioned

49. Calomel electrode is made up of _______
Mercurous chloride
Mercurous sulphide
Potassium chloride
Potassium sulphide

50. Glass electrode is a/an _______
Reference electrode
Indicator electrode
Calomel electrode
None of the mentioned