- Describe the principle and working of float \& shaft level unit, with the heip of neat diagram. - When will you employ differential pressure method for level measurement? Describe its working. - Define pH. Give the types of pH meters. State applications of pH measurement. - Explain float and tape liquid level gauge briefly - Explain potentiometric titration briefly. - What is refraction? Why the separation between dark and bright portions is observed in view of refractometer? - Discuss in brief the following i) Ultrasonic level measurement ii) Potentiometrictitrations - Explain Gamma Ray method. - Explain the working of Ultrasonic method and resistive method. - State the principle and applications of refractometry. - Explain with diagram; working of level measurement unit for dry materials. - State the principle and applications of conductivity measurement. - State the principle and applications flame photometry