Question 2 (a) (b) (၁) A Capacitive Transducer uses two quartz diaphragms of area 750 mm² separated by a distance of 3.5 mm. A pressure of 900kN/m² when applied to the top diaphragm produces a deflection of 0.6 mm. The capacitance is 370 pF, when no pressure is applied to the diaphragms. Find the value of capacitance after the application of a pressure of 900kN/m². [8 Marks] A capacitive transducer is made up of two cylindrical electrodes. The outer diameter of the inner cylindrical electrode is 3 mm and the dielectric medium in air. The inner diameter of the outer electrode is 3.1 mm. Calculate the dielectric stress when a voltage of 100 V is applied across the electrodes. Is it safe limits? The length of electrodes is 20 mmm. Calculate the change in capacitance if the inner electrode is moved through a distance of 2 mm. The breakdown strength of air is 3k V/mm. [12 Marks] Sketch and Explain about the principle working of capacitive transducer. Discuss how change of capacitance is obtained. [5 Marks] Question 4 (a) A temperature Alarm unit with a time constant of 120 sec is subjected to a sudden rise of temperature of 50°C because of a fire. If an increase of 30°C is required to actuate the alarm, what will be the delay in signalling the sudden temperature increase? [6 Marks] (b) Discuss and sketch working of transducer on the principle of Linear Variable Differential Transformer (LVDT). (၁) (d) [8 Marks] The output voltage of a LVDT is 1.5 V at maximum displacement. At a load of 0.5 M2, the deviation from linearity is maximum and it is 0.003 V from a straight line through origin. Find the linearity at the given load. [4 Marks] A 220 V, 10 HP, Four pole, 50 HZ, Y-connected induction motor has a full load slip of 5% What is the synchronous speed of this motor? (i) (ii) (iii) What is the rotor speed and frequency of this motor at rated. load What is the shaft torque of this motor at rated load? [7 Marks]