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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.

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.

Q.4Determine the current flowing in the capacitor(-j25ohm) and its direction as shown in Figure below. Assume the voltage source to have negligible impedance.

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Q.3: For the magnetically coupled the values of coupling coeff.cuit shown, find "k" when the power at 100 resistance is equal to (40W) if Vs=5020°V. (Ans.: 0.279) Vs K J692 J752 4.6792 ww 592 109

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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.

igtht Login .. ILUVEPDF ulg3l P.. Q/ Given the information provided in figure below, determine: RB Vcc 32.1 μΑ 32.5 KN Rg VCE = 7.3 V 2.1 V 20.42 K2 RB = 952.5 KO RB = 925.5 KO a RB = 592.5 KO