According to the following, the puncture voltage of the insulator in a smooth-field system is minimal calculate the clearance value of the critical pressure x. (A = 30 1/ cm. Torr, B = 400 V/ cm. Torr, y=1/5000)
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- Question A suspension type insulator has three units with self-capacitance C and ground capacitance 0.1C. What will be the string efficiency?7. Each of three insulators forming a string has self-capacitance of "C farad. The shunt capacitance of each cap of insulator is 0-25 C to earth and 0-15 C to line. Calculate the voltage distribution across each insulator as a pecentage of line voltage to earth and the string efficiency. [31-7%, 29-4%, 38-9%; 85-7%]7. Each of three insulators forming a string has self-capacitance of "C farad. The shunt capacitance of each cap of msulator is 0 25 C to earth and 0-15 C to line. Calculate the voltage distribution across each insulator as a pecentage of line voltage to earth and the string efficiency.
- We want to investigate how the field strength will be with air as dielectric and with steatite. A plate capacitor is placed in a 24 kV network between phase and ground. The relative permittivity of air is &=1 and for steatite &-6. The plate capacitor has area = 1m². The distance between the electrodes is 2 mm. Ep = 8.854-10-12 F/m A=1m² d=2mm a) Calculate the maximum field strength in the plate capacitor. (Answer: 9.8kV/mm) b) What is the capacitance of the capacitor if we use steatite? (Answer: C = 26.6nF)7. Each of three insulators forming a string has self-capacitance of “C" farad. The shunt capacitance of each o h cap of insulator is 0-25 C to earth and 0-15 C to line. Calculate the voltage distribution across each insulator as a pecentage of line voltage to earth and the string efficiency. [ 31-7%, 29-4%, 38-9%; 85-7%]8. Each of the three insulators forming a string has a self capacitance of C farad The shunt capacitance of each insulator is 02C to earth and 0-1 C to line. A guard-ring increases the capacitance of line of the metal work of the lowest insulator to 0-3 C. Calculate the string efficiency of the arrangement: )with the guard ring. (7) without guard ring. 10 95% () 86 13%|
- 2. When a current of 1A flows through a wire, the drift velocity of the electrons is 0.9 mm/s. What will be the drift velocity of the electrons when a 2A current flows through another wire of the same material having double the length and double the area of cross section and same temperature.kindly Briefly explain the opacity and translucency in insulators. thank you!8. Liquids with solid impurities a) Have higher dielectrie strength b) Of large size have higher dielectric strength c) Have lower dielectric strength as compared to pure liquids d) None of the above 9. Peak to peak ripple is defined as a) the difference between average de voltage and peak value b) the difference between maximum and minimum de voltage c) the difference between maximum ac and average dc voltages d) the difference between ac (rms) and average de voltages 10. In a Cockroft-Walton circuit, input voltage 100 kV load current 25 mA, supply frequency 100 Hz, each capacitor 10 nF. The optimum no. of stages for maximum output voltage is a) 1 b) 2 c) 10 d) 35
- Which of the following statement is true? a. Angle between load voltage and load current in a pure capacitive load is 45 degree. b. Angle between load voltage and load current in a pure capacitive load is is 180 degree. c. Angle between load voltage and load current in a pure capacitive load is is zero. d. Angle between load voltage and load current in a pure capacitive load is is 90 degree.Subject:electronic engineering Why a semiconductor acts as an insulator at 0°k and why its conductivity increases with increasing the temperature?I need the detailed solution for this questions. (Correction for given values : Dielectric constant : 5.0 Uniform thickness : 0.6d )