Question

T duestions QUESTION 1: (20 marks) (a) A Mechatronic system uses a mechanical fioat valve system to sense and maintain the water level in a tank. The mechanical float vaive system is to be replaced to allow remote level indication ) State one type of sensor that could be used in the above (2 marks) Mechatronic system to sense the water level i) With the aid of a simple sketch, briefly describe the basic operation (4 marks) of the sensor chosen in Q1(a) i) Figure Q1 shows a Briefly describe the operation of this type of sensor bimetallic sensor used in a control system. (4 marks) Metal 1 Support Movement Metal 2 Figure Q1 Bimetallic sensor (10 marks) A steel bar with a modulus of elasticity 200 GPa and diameter 10 mm is (b) loaded in tension with an axial load of 50 kN. If a strain gage of gage factor 2.115 and resistance 120 Ω is mounted on the bar in the axial direction, what is the change in resistance of the gage from the unloaded state to the strained state? If the strain gage is placed in one branch of a Wheatstone bridge (R1) with the other three legs having the same base resistance (R2 # R3-R4-120 ),Determine the output voltage of the bridge (Vou) in the strained state and the stress in the bar.

Answer 1

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