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MCQs

Total Questions : 100 | Page 2 of 10 pages
Question 11. The movement of diaphragm in simple infrared analyser for gas analysis results in which of the following?
  1.    Variable resistance
  2.    Variable inductance
  3.    Variable capacitance
  4.    Variable conductance
 Discuss Question
Answer: Option C. -> Variable capacitance
Answer: (c).Variable capacitance
Question 12. In calibration of CO₂ analyser, in order to establish zero calibration which of the following is used as sample?
  1.    Oxygen
  2.    Hydrogen
  3.    Inert gases
  4.    Nitrogen
 Discuss Question
Answer: Option C. -> Inert gases
Answer: (c).Inert gases
Question 13. Which of the following is used as detector in improved infrared analyzer used for gas analysis?
  1.    PbSe
  2.    MgCl₂
  3.    ZnCl
  4.    CuCl₂
 Discuss Question
Answer: Option A. -> PbSe
Answer: (a).PbSe
Question 14. Which of the following is not the characteristics of Indium arsenide photovoltaic detector used in infrared analyzers for hydrocarbons?
  1.    It operates at ambient temperature
  2.    Has maximum detectivity at 3.4µm
  3.    Sensitivity increases at longer wavelength
  4.    It has no response to radiation of wavelength greater than 4µm
 Discuss Question
Answer: Option C. -> Sensitivity increases at longer wavelength
Answer: (c).Sensitivity increases at longer wavelength
Question 15. Which of the following is not the drawback of conventional infrared analyzers used for gas analysis?
  1.    Cell is difficult to maintain
  2.    It is expensive to replace
  3.    Detector is vibration sensitive
  4.    Only one source is used
 Discuss Question
Answer: Option D. -> Only one source is used
Answer: (d).Only one source is used
Question 16. Which of the following materials are generally not used for the construction of filaments in thermal conductivity analyzers?
  1.    Tungsten
  2.    Gold
  3.    Platinum
  4.    Kovar
 Discuss Question
Answer: Option B. -> Gold
Answer: (b).Gold
Question 17. Thermistors have positive temperature-coefficient of resistance.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 18. Which of the following is not the characteristic of thermistors used in thermal conductivity analyzers?
  1.    High negative temperature coefficient of resistance
  2.    Slow response
  3.    Extremely sensitive
  4.    Low cost
 Discuss Question
Answer: Option B. -> Slow response
Answer: (b).Slow response
Question 19. How can the high speed of response be obtained in thermal conductivity analyzers?
  1.    By increasing the pressure of gas surrounding the filaments
  2.    By reducing the pressure of gas surrounding the filaments
  3.    By reducing the temperature of gas surrounding the filaments
  4.    By increasing the temperature of gas surrounding the filaments
 Discuss Question
Answer: Option B. -> By reducing the pressure of gas surrounding the filaments
Answer: (b).By reducing the pressure of gas surrounding the filaments
Question 20. Which of the following bridges are used in thermal conductivity analyzers?
  1.    Wheatstone bridge
  2.    Kelvin’s bridge
  3.    Anderson’s bridge
  4.    Schering’s bridge
 Discuss Question
Answer: Option A. -> Wheatstone bridge
Answer: (a).Wheatstone bridge

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