xaminer: Dr A Haworth re. As a result, bing. in less es? examinat plete this ENGG201 School of Engineering 45367 Examiner: Dr A Haworth Question 4 [25 marks] An engineer is

involved in the transportation of a large tank of water. (a) A thermocouple, which utilises the Seebeck effect, is used to measure the temperature of the water. What is the Seebeck effect? [3 marks] (b) The engineer uses a differential pressure device to determine the level of water in the tank. This has been designed such that the pressure transducer is attached very close to the vessel. The upper sensing line rises a vertical distance of 12 m and is filled with air. The pressure transducer reads 5 kPa with the tank showing the highest pressure. Determine the height of the water surface above the transducer. [6 marks] (c) Name another device that could be used to measure the level of the water and briefly describe how it works. [4 marks] (d) With the aid of diagrams, explain how a device containing a strain gauge could be used to measure the acceleration of the tank. [6 marks] (e) A strain gauge has a resistance of 150 2 and a gauge factor of 2. It is used in a quarter bridge with three resistors (with resistance of 150 2) and a 5 V supply voltage. Determine the output voltage if the strain gauge is mounted to a structure that undergoes a strain of 1250 με. [6 marks] e