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- 5.- For the figure shown below. Determine the following: (a) Potential difference between points a and b when switch s is open. b) Which of the points, a or b, is at higher potential? c) What is the final potential of point b when switch s is closed? d) How much does the charge of each capacitor vary when switch s is closed?For the circuit given in Figure-2, let the switch was initially closed at position-1 for a 5T time and then the switch is moved to position-2 and left there. Determine: i. Draw capacitor charging circuit and time constant for charging circuit. ii. Expression for vc and ic while switch is in position-1. iii. Compute vc and ic at t = 1T time while switch is at position-1. iv. Time constant for discharging circuit and draw discharging circuit. v. Expression for vc and ic while switch is at position-2. vi. Compute vc and ic at t = 1T while switch is at position-2. vii. Sketch the voltage and current plot for charging and discharging of capacitor and indicate voltage and currents points on the plot. 10 kΩ ( 15 kN R1 R3 E R2 5 kN E= 200V Figure-2 C= 20.75miyu FWe 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)
- For the following circuit, do the following:a) Write the mathematical expressions for the voltage VC, VR1 and IC if the switch is on theposition 1.b) Find the voltage VC, VR1 and IC if the switch changes to a position 2 at t = 100ms.c) Determine the discharge time of the capacitor.d) Draw the charge and discharge waveforms.Question A suspension type insulator has three units with self-capacitance C and ground capacitance 0.1C. What will be the string efficiency?a. As capacitor charges, describe the behavior of: i.current with time ii. the voltage across the resistor with time iii. capacitor voltage withtime Explain the reason for each behavior.
- Q3: Two circuits are arrange as shown in figure (1), (a and b) each one of them has two identical conductors , the vertical distance between each conductor in the same circuit is 1 m, the distance horizontlly between circuits is 30 cm, take 1 cm as diamter for each conductors. Derermine the inductance per km of the double circuit ? a a' b' FIGURE (1)Consider the large inductor in Figure 3 with given number of turns N, core permeability μ, core cross section area A, and core diameter are given. Note that the core length l is equal to π times the core diameter. Answer the questions and pick an answer from the given choices. Once fully charged, SW2 is closed at the same time SW1 is opened. Nearly how long will it take for the inductor to self-discharge though its own coil resistance? a) 1h 22 min b) 10.2 min c) 55 sec d) 18.5 minA 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 positive
- What causes transients? Select one or more: a. Energy is stored into capacitance and inductance b. Power required for transporting energy can be infinite c. The power required for transporting energy cannot be infinite Od. Energy is stored into resistance and capacitance e. Energy is stored into resistance, capacitance and inductanceIn this question; When capacitor full charged, is there a current for S1(switch1) ? Can you draw current graph for S1(switch1) ? Thank you :)For the network shown in figure (3), if the switch is closed for 2usec and then opened for Susec, find mathematical expressions for vi and in of both periods of time and then plot the waveforms of vL and i as a function of time.