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Total Questions : 100 | Page 6 of 10 pages
Question 51. Which of the following happens to the magnetic susceptibility of gases when the temperature changes?
  1.    It increases with increase in temperature
  2.    It decreases with increase in temperature
  3.    It remains constant with increase in temperature
  4.    It remains constant with decrease in temperature
 Discuss Question
Answer: Option B. -> It decreases with increase in temperature
Answer: (b).It decreases with increase in temperature
Question 52. If the oxygen content is not greater than 21%, which of the following gases must be used to set the span point?
  1.    Oxygen
  2.    Dry air
  3.    Nitrogen
  4.    Hydrogen
 Discuss Question
Answer: Option B. -> Dry air
Answer: (b).Dry air
Question 53. If the oxygen content is greater than 21%, which of the following gases must be used to set the span point?
  1.    Oxygen
  2.    Dry air
  3.    Nitrogen
  4.    Hydrogen
 Discuss Question
Answer: Option A. -> Oxygen
Answer: (a).Oxygen
Question 54. Which of the following does not occur in Hartman and Braun oxygen analyzer based on the magnetic wind?
  1.    Oxygen is attracted to the magnetic field
  2.    Oxygen becomes less paramagnetic due to rise in temperature
  3.    Resistance change in a resistance connected to the Wheatstone bridge occur
  4.    Wheatstone Bridge becomes balanced due to temperature change
 Discuss Question
Answer: Option D. -> Wheatstone Bridge becomes balanced due to temperature change
Answer: (d).Wheatstone Bridge becomes balanced due to temperature change
Question 55. Which of the following is not a cause of the error that could occur in Hartman and Braun oxygen analyzer based on the magnetic wind?
  1.    The filament temperature could be affected by changes in thermal conductivity of the carrier gas
  2.    Hydrocarbons in sample stream may react on the heated filaments
  3.    Gravitation chimney flow effect lead to errors when cross tube is horizontal
  4.    Combustible gases may react on the heated filaments
 Discuss Question
Answer: Option C. -> Gravitation chimney flow effect lead to errors when cross tube is horizontal
Answer: (c).Gravitation chimney flow effect lead to errors when cross tube is horizontal
Question 56. Hydrocarbons need to be removed from the sample gas to avoid errors in Hartman and Braun oxygen analyzer.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 57. Magnetic wind analyzers are also known as which of the following?
  1.    Thermo-magnetic analyzers
  2.    Electro-magnetic analyzers
  3.    Thermo-analytical analyzers
  4.    Hot wire analyzers
 Discuss Question
Answer: Option A. -> Thermo-magnetic analyzers
Answer: (a).Thermo-magnetic analyzers
Question 58. In OXYMAT-M oxygen analyser which of the following is usually used as reference gas?
  1.    Hydrogen
  2.    Nitrogen
  3.    Helium
  4.    Ambient air
 Discuss Question
Answer: Option D. -> Ambient air
Answer: (d).Ambient air
Question 59. Which of the following is used in magnetic wind instruments to determine the amount of oxygen?
  1.    Change in resistance
  2.    Change in capacitance
  3.    Change in inductance
  4.    Change in concentration
 Discuss Question
Answer: Option A. -> Change in resistance
Answer: (a).Change in resistance
Question 60. Which of the following concepts are not used in magnetic wind instruments?
  1.    Change in resistance due to cooling by magnetic wind
  2.    Displacement of membrane by magnetised oxygen
  3.    Difference in pressure difference between two gases having varying concentration of oxygen
  4.    By measuring temperature using thermometer
 Discuss Question
Answer: Option D. -> By measuring temperature using thermometer
Answer: (d).By measuring temperature using thermometer

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