EEE439 project S24

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.

4- Electrical failure of insulators occurs due to and 5- The other name of self-capacitance in a string of suspension insulators is ......

In electronic circuits it is not unusual to encounter currents in themicroampere range. Assume a 35 μA current, due to the flow ofelectrons. What is the average number of electrons per second that flowpast a fixed reference cross section that is perpendicular to the directionof flow?

A. Explain the difference between charging current andfaradaic current. B. What is the purpose of waiting 1s after a voltage pulse before measuring current in sampled current voltammetry? C. Why is square wave voltammetry more sensitive than sampled current voltammetry?

Explain, what is the potential barrier in semiconductors. Note: no need to give an exact definition, please explain it in an easy way.

Identify elements that are in parallel a. in Figure P1.37, b. in Figure P1.43, c. in Figure P1.44.

A-How temperature affects the conductivity of conductive metals and how it affects semiconductors.semiconductors B-What is superconductivity, how does it relate to temperature? Some examples of superconductors.superconductors.

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.

Calculate the equivalent resistances Rin of the following circuits. (The resistance value of the diodes in the conduction will be 0, the resistance value of the diodes in the insulation will be taken as infinity. R1=10ohm

PROBLEM 2 Two semiconductor materials A and B shown in the given figure, are made by doping germanium crystal with arsenic and indium respectively. The two are joined end connected to a battery as shown in figure. Is the junction forward biased or reverse biased? A B

Briefly describe engineering materials

1. Answer the following with "TRUE" or "FALSE" then explain why.  ________a.) Charges choose the path of least resistance. Given a resistor in parallel with a diode, no current willflow through the resistor when the applied voltage exceeds the diode’s forward voltage.________b.) Since diodes are unidirectional components, it will always block AC signals e.g. pulse train,sawtooth, triangular signals.________c.) Silicon diodes typically have a forward voltage of 0.7V.

Question A suspension type insulator has three units with self-capacitance C and ground capacitance 0.1C. What will be the string efficiency?

relationship between leakage current and open circuit voltage in silicon solar cells quantitatively and qualitatively.

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

Nichrome ribbon resistor elements each has a resistance of 1 ohm. The element is made from sheet of nichrome alloy, 0.025cm thick. If the width of the ribbon is 0.3cm, what length is required per element? Assume specific resistance of nichrome allow to be 109micro ohm-cm.

Please give a detailed solution Thank you

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)

Compare alternative and direct currents by comparing their physical properties. (Explain alternans, cycles, periods, frequency terms during this comparison. Also in this comparison, explain the electron flow directions separately in alternating and direct current)

How about solving this using KCL equations? Thank you

(1) What is normally the origin of majority charge carriers? and of minority charge carriers? (2) How does one estimate the overall (net) charge in a piece of extrinsicsemiconductor where we have both majority and minority carriers?

Please make a concept map of the covalent link theme for semiconductors with the following subtopics, you can add tables, graphs, images, or things you think are relevant 1.5 Driving process 1.5.0 Introduction 1.5.1 Mobility 1.5.2 Relationships between carrier equilibrium concentrations 1.5.3 Detailed balance principle 1.5.4 Carrier equilibrium concentrations in homogeneous semiconductors 1.5.5 Conductivity 1.5.6 Hall Effect

The work function for the anode is bigger than that of the cathode, resulting in a so-called "contact-potential difference" between the anode and cathode. Its effect is to shift the entire Current vs. Voltage curve (why?). Estimate the contact potential difference. 7

Discuss the significance of Moore's Law in the context of microchips and semiconductor technology. How has the continuous scaling of microchips influenced their performance and energy efficiency over time?

D1 Vsecondary Vfiltered D2 V1 sine Rload I 120 VAC @ 60 Hz D3 10:1 - D4 Figure 1: Bridge Rectifier Voltage Regulator Circuit The filter capacitor C, is recharged on every half-cycle of V secondary. Given: Rioad = 100 N VDiodes = 0.7 V Vi is given in RMS What is the minimum value of capacitor C, required such that Vrutered does not drop below 8 V?

Which statement(s) is (are) true about a P-N junction: A. P-N junction consists of n-type and p-type semiconductor materials.B. Free electrons in n-type diffuse across junction to p-type.C. A depletion region formation happens due to electrons and holes moving away from each other due to the electric field.

a) Explain the band structure of an electrical conductor (metal), a semiconductor, and an insulator at 0 K by showing the valence and conduction bands and fermi energy levels. Explain how the electrical conduction takes place in these three types of materials. Give an example for each type of material. b)Explain what n and p-type semiconductors are using their band structures.

(a) Suppose the excess carriers is uniform, what changes does it make to the 'Ambipolar transport equation' for a n-type semiconductor. Explain the equations.

Please choose the correct answer and explain if possible. Thank you. 4. The main terminal voltage across an ON conducting SCR depends on the instantaneous main terminal current in the following way: a. They are proportional b. The voltage increases as the current increases, but no quite proportionally c. The voltage increases as the current increases, by a squared (seond power) relationship d. They are virtually non-related 5. To turn Off a conducting SCR in a dc-powered circuit, it is necessary to: a. Interrupt (stop) the gate current b. Wait for the main terminal current to fall below IHO when the supply voltage crosses through zero c. Deliver a pulse of negative gate current via the gate lead d. Place a temporary reverse bias across the SCR’s main terminals 6. In a simple RC charging circuit used for trigger-control of an SCR, a good range of adjustment of the RC time-constant is: a. 1 to 5 msec b. 1 to 30 msec c. 0.1 to 10 msec d. 2 to 25 μsec