Q3) The self capacitance of each unit in a string of four suspension insulators is C. The shunting capacitance of the connecting metal work of each insulator to earth is 0-2 C. Calculate (i) the voltage across each insulator and (ii) string efficiency.
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- 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.Question A suspension type insulator has three units with self-capacitance C and ground capacitance 0.1C. What will be the string efficiency?Which of the following is not true for ferromagnetic materials? Please choose one: a. High?mthey have value. b.Above the Curie temperature, they lose their non-linear properties. C. a fixedµrthey have value. D.The energy loss is proportional to the area of the hysteresis loop.
- 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.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%]If we increase the load than core loss and copper loss will... Decrease Increase Remain same
- Electrical Engineering An insulator has 3 units. The capacitance between each insulator pin and earth is 15% of self capacitance of each unit. Find: a. Voltage across each insulator unit in percentage. b. String efficiency.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) 35We 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)
- A triac can pass a portion of …………… half-cycle through the load a. neither positive nor negative b. both positive and negative c. only negative d. only positiveFerromagnetic materials have this characteristic. A. A relative permeability slightly less than one. B. A relative permeability slightly greater than one. C. A very high resistivity. D. A high relative permeability.In a 36KV overhead line, there are 3 units in the string of insulators. If the capacitance between each insulator to pin and earth is 55% of self-capacitance of each insulator. Find the distribution of voltage over three insulators and string efficiency.