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- A generator rated at 30MVA, 11kV has a reactance of 40%. Calculate its p.u. reactances for a base of 50MVA and 10kV. O 0.606 p.u. O 0.506 p.u. O 0.806 p.u. O 0.706 p.u.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)Exercise-1 Vs = 240V 60Hz Is=10A/....... Power system Is ww R 1k0 Xc=-j/(2pi60x0.00016)=-1994 XL=ZL=j2pifl=j2pi60x0.142=j53.54 142mH Is=Ir+IL+Ic=.........=Vs/Ztotal=....... 160μF
- Find 2.T of . the following : as % { sin wn 3 3. c) %{ cosh.wn}An inductor of value 5.6 H is connected across 240 V, 109 Hz supply. Then the value of inductive reactance is ohms. 7666.62 1220.80 1916.66 3836.80I. SOLVE THE FOLLONING PROBLENS : A COPPER WIRE OF 0,3 Mm RAAUS HAS A LEN ETH OF 1. JOM- IF THE RESISTIVITY of cOpPER IS 1-7 x0 WHAT WOULD BE THE RESISTANOE OF THE WIRE? OF A 100m WIRE IS 1035 mm AND 3.7 OHMS. WHAT 2. THE DIAMETER THE REISTANCE IS IS THE CONDUCTIVITY 3. WHAT WILL BE THE VALUE OF A CAPACITOR WHEN IT HAS A CAPACITIVE REACTANCE OF 300R ANP to A 6o HZ. SUPPLY? IN FARADS IS CONNECTED 4. WHAT Is THE VALUE OF THE RESISTOR WITH THE FOLLOWING COLORS ? A. BROWN, BLACK, GOLD, REP B. BLUE YELON BROWN, SILVER PED, SILVER, BROWN, VIOET C. 5. AND t WHEN V 220V AND R= 50n WHEN I = 45 A WHEN V = 120V FIND V ANO R 80n AND AND E= 11A-
- Q2. For the circuit shown below, sketch the current waveforms iş and io and determine the Average and RMS for both currents. a = 50° TI 50 2 Vs = 300 sin 100zt ( cot T2 in cotDetermine ZT for the circuit if inductive reactive is 10220 and resistance is 9850. Answer:Ererrises: IA platinum oil has a resifance of 3-14k r at go°C and 3.747JV at 100°C.- Fin'd the resistance at o'C ond the kmp -creff. of resifonce af 40°C 2. A pofential difference of r5oV is apphed to a field wnding at 15°C and the currend is SA. What will be the mean fempouafure of the winiding when currend has falen to 3.91A, apphedvrltage being constant Aasume s =p7.5. 3. A cril has a resi fance of 182 when its mean femperature is 20°C and 20v when ik mean femperature s 50°C. Frid is mean femperature rise when ik resotonce is 21JL and the sorrandinig femperature is i5°C. A cril of a relay takes a curre of 0.12 A when it is at the vem insbi o al 4. A jemperature of is'C ond canneckerdacms a oV supply If the minimum operating current of the relay is 0.1 A, colculate the femperature above ohich the relay will fail to operate when connected ti the same supply. Resi tncenfemp.coefficrenf of the cril makria] is o.0043 per °C at 0°C.
- 5. What value of the current when a capacitor of 10uF connected to a 110V a.c. 50 Hz power supply? A. 0.20 A C. 0.30 A B. D. 0.25 A 0.35 AAcross a 230V, 60Hz powers supply is a 15ohm non-inductive resistor. What is the equation of the resulting current? A. 21.68sin377t B. 26.55sin377t C. 15.33sin377t D. 28.16sin377tIf E = 1.05 p.u. leading by 25 degrees, feeding infinite bus bar through a reactance of 0.35. Find the reactive power flowing. a. 0.138 b. 1.514 c. 2.618 d. 0.43