Industrial Gas Analysers(Analytical Instrumentation ) Questions and answers for exam Preparation

Question 1. Which among the following gases have diamagnetic property (ability to be repelled by magnetic fields)?

Oxygen
Nitrogen
Nitrogen dioxide
Nitric oxide

Explanation:-

Answer: Option B. -> Nitrogen
Answer: (b).Nitrogen

Question 2. The force produced during the operation of Paramagnetic oxygen analyzer is proportional to which of the following?

Magnetic susceptibility of sphere
Magnetic susceptibility of surrounding gas
Difference between magnetic susceptibility of sphere and magnetic field strength
Difference between magnetic susceptibility of sphere and that of surrounding gas

Explanation:-

Answer: Option D. -> Difference between magnetic susceptibility of sphere and that of surrounding gas
Answer: (d).Difference between magnetic susceptibility of sphere and that of surrounding gas

Question 3. Which of the following gases have paramagnetic property (ability to get attracted to a magnetic field)?

Nitric oxide
Hydrogen
Helium
Nitrogen

Explanation:-

Answer: Option A. -> Nitric oxide
Answer: (a).Nitric oxide

Question 4. In Paramagnetic oxygen analyzer, the expression for magnitude of force produced can be expressed as, F = C (K-K₀), where K= magnetic susceptibility of surrounding gas and K₀= magnetic susceptibility of sphere. C denotes which of the following?

Magnetic field strength
Magnetic gradient
Function of magnetic field strength and gradient
Magnetic flux

Explanation:-

Answer: Option C. -> Function of magnetic field strength and gradient
Answer: (c).Function of magnetic field strength and gradient

Question 5. In Paramagnetic oxygen analyzer, the electrostatic force that is exerted should have which of the following features?

It should be greater than the magnetic field and must be in the same direction
It should be equal to the magnetic field and must be in the same direction
It should be greater than the magnetic field and must be in the opposite direction
It should be equal to the magnetic field and must be in the opposite direction

Explanation:-

Answer: Option D. -> It should be equal to the magnetic field and must be in the opposite direction
Answer: (d).It should be equal to the magnetic field and must be in the opposite direction

Question 6. Which of the following is not an advantage of electrochemical cells used for analysis of H₂S?

Portable battery operated instrument
Pocket sized instrument
No pumps are needed
No interference from background gases

Explanation:-

Answer: Option D. -> No interference from background gases
Answer: (d).No interference from background gases

Question 7. Which is the compound that forms the stain in Lead Acetate Tape Staining method used for the analysis of Hydrogen Sulphide and what is the colour of the stain?

Lead Sulphide, red colour
Lead Sulphide, brown colour
Hydrogen acetate, white colour
Hydrogen acetate, green colour

Explanation:-

Answer: Option B. -> Lead Sulphide, brown colour
Answer: (b).Lead Sulphide, brown colour

Question 8. Which of the following methods is not used for detection of hydrogen sulphide?

Lead acetate tape staining method
Solid state sensor
Chemiluminescence method
Electrochemical cells

Explanation:-

Answer: Option C. -> Chemiluminescence method
Answer: (c).Chemiluminescence method

Question 9. Which of the following is not an advantage of solid state sensor used for analysis of H₂S?

No sampling system
It can be used in conditions involving vibration
It can be used in corrosive atmosphere
No interference from background gases

Explanation:-

Answer: Option D. -> No interference from background gases
Answer: (d).No interference from background gases

Question 10. Which of the following methods are mainly used in combustible gas detection equipment?

Lead acetate tape staining method
Solid state sensor
Gold film sensor
Electrochemical cells

Explanation:-

Answer: Option B. -> Solid state sensor
Answer: (b).Solid state sensor