JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech IV Year ANALYTICAL INSTRUMENTATION Previous Question Paper (November/December - 2018 - R15)
Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks and may have a, b, c as sub questions.
Part A
Explain the principle of operation of polarographic cell.
Answer
A polarographic cell operates on the principle of electrolysis using a dropping mercury electrode (DME) as the indicator electrode and a large pool of mercury or a saturated calomel electrode as the reference electrode. As the applied voltage increases, the current flowing through the cell is measured, resulting in a polarogram where the limiting current is directly proportional to the concentration of the electroactive species in the solution.
What are the deviations of Beer’s Law?
Answer
Deviations from Beer's Law occur due to: 1) Chemical deviations caused by association, dissociation, or complex formation of the analyte at high concentrations. 2) Instrumental deviations arising from the use of non-monochromatic radiation or stray light. 3) Physical deviations due to high concentrations (typically >0.01 M) where electrostatic interactions between molecules alter their absorptivity.
What are different columns used in Gas chromatography?
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What are the materials used for sampling systems?
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What are the basic requirements of monochromators used in spectrophotometers?
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What are different sources for UV and Visible spectroscopy?
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What are different detectors used in FTIR spectroscopy?
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Distinguish between absorption spectra and emission spectra.
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What is the principle of atomizer?
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Discuss different magnetic systems used in NMR spectroscopy.
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Part B
What is Beer-Lambert law? Derive it mathematically.
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What are the basic requirements of sampling systems?
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What is chemiluminscence phenomenon? Explain its anyone application.
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What is pH? Explain the different electrodes used for pH measurement?
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What is column chromatography? Explain briefly.
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Draw the thermal type paramagnetic oxygen analyzer and explain.
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Draw the schematic diagram of Gas chromatography and explain the working of various parts of it.
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Draw and explain the dual flame ionization detector.
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Discuss about different prisms and their materials used for UV and Visible spectroscopy.
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Why gratings are preferred rather than prisms in spectroscopic instruments?
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Explain the operation of double beam spectrophotometer.
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Explain the working of any one source for UV spectroscopy.
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Explain the principle of Infrared spectroscopy.
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Explain the operation of Golay pneumatic detector for IR spectroscopy.
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Explain the operation Fourier transform spectroscopy with a neat diagram.
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Explain the working principle of flame photometer.
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Explain the principle of operation of NMR spectroscopy.
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Explain the use of computers in NMR spectroscopy.
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Draw and explain the working of ESR spectrometer in detail.
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Explain the operation of Ionization chamber and identify different regions of operation.
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