In a design task, a wire of 2000 m requires to exhibit a voltage drop of 2.5 V when 3.2 A of current passes though it. Based on the Table Q1 (b) below, in your opinion, which of the wire is the most suitable for aviation when the fuel saving is another factor to be considered as well.
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In a design task, a wire of 2000 m requires to exhibit a voltage drop of 2.5 V
when 3.2 A of current passes though it. Based on the Table Q1 (b) below, in
your opinion, which of the wire is the most suitable for aviation when the fuel
saving is another factor to be considered as well.
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- 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.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) 35Q5. Describe the properties of ferromagnetic materials.
- 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)Question A suspension type insulator has three units with self-capacitance C and ground capacitance 0.1C. What will be the string efficiency?this is the ability of a material to conduct electricity a. impedane b. conductance c. reactance d. capacitance
- 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.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.F.) An iron core has a cross-sectional area of 10^(-3) square meter and mean circumference of 1 meter. The relative permeability of the material is 500 and the number of turns is 200. Determine the current required to set up a flux of 0.001 weber. a. 7.54 A b. 7.96 A c. 8.19 A d. 8.47 A
- 3. A coil consist area ot 0.8 mm? The mean 2.000 turns of copper wire haU ing length par copper is 0.02 MICD ohm -m. Find' the resistance absor bed by the coil when connected acoss lov de rupply. sectional a crass - turn is 0o cm and the rerictivity the coil and . powerBesides lower electrical conductivity, suggest a reason why ruthenium is not used inelectrical transmission wires. Give a detailed responseWhich 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.