Question

32. A transformer is to be designed to increase the 30 kV-rms output of a generator to the transmission-line voltage of 345 kV-om. If the primary winding has 80 turns, how many turns must the secondary have? b. 70 c. 920 d. 9200 e 12 33. The primary winding of an electric train transformer has 400 turns and the Secondary has 50. If the input voltage is 120V(rms) what is the output voltage? a. 15 V (rms) b. 30 Vrms) c. 60 Vrms) d. 24V (rms) e. 960 Vrms) Calculate V/V., for the circuit if R=2 k2, C=0.02 JF and V= V=140V sin(50 000+) 37. R V. a. 002 b. 045 080 d. 098 223 38. The impedance of the parallel RLC circuit shown is given by 1 1 a. b. 1 R? 1 / 1 1 R et ac d. Roe federation e. VR al

Answer 1

Solution 0 Prob.32 We know that for Transformer property = е ly Where W, Primary voltage Us Secondary voltage. Hi number of twins in the Primary windi winding Na Number of twins in the secondary winding In problem 32) given W=30kV V =345kV N,= 80 Na=? from eq N Ng 20, No= doc 345 30 Na १२० Therefore Number of turn in secondary winding Na= 920 option @ in correct An

Prob 33 given N, = 400 N2 - 50 - 120v V2 2 3 from eq ② Va= 2 [No 3. +29 وع पक्व la = 15 voms) option ca' is corred Problem 37 given) R = 2Ko2 С= o.oЯАР 2= 140 sin (50000t) W=50x103 rad/se R 1 Vin voul Ii By using Voltage division Rule Vout vin Xc R+Xc where xe Two Ja soxio قان j+50x103 x 2x10 Xc = lor 10-4

te= vio3 from a -j 1000 Vout Vin ( 2000 з (оо б T Vout vin 2-j vout Magnitude it's 3+1 = 0.447 یا وہ یہ = Vout 0.45 option és correed Problem (38) Is LIC LER R room Us We know Phasor diagram for Parallel RLC circuit Ic A IR 387 ze 2 IL Is (J17) IL-Ic +IR

u from Current triangle Weassum ТУТc. Is - IR²+ (IL-I) ? Is= ✓ IR² + (JL-ILJ Icares But IR Le Is a les XL to Putting these value in ex ® LA Is = ✓ () ² + ( us us ) or interm af w , Xepes Is r usage + ( use you usel()? Is= Us ke (ter-we)? Rat - Les Is ✓ RR + ( tow-we) - us Is + ( we wa We know Us IS to Tapet Impedence Zg = Rat (we-to je

or 12 [-kat (wc - W ? Impedence of Parallel Circuit option (6) is correct Probsd lauf 1omth I's los АМ m. TH Us 10kHz 9 given Is = 0.20 Amp Voltage drop aceros resistance will be VR= Is. R - 0.2 x 10 VR = 2 volt Impedance z= r R? + (wh- wej? Z = 100+ (211x10" x 10² 218104xlos. xion ] Z = Top [2010? - Hindi Z = 626.80R

Vs = IZ Vs= 0.2x 626. Ug = 125.36 vald 0.2x2TX 10 x 102 = 0.2 x anfyt VL = IXXL 2 1,25810 V2 = 125 volt Ix/ Vc = Ixxc = aufc 0.24 2 217x 109 x 105 Vc = 0.3983 vold Therefor Voltage drop across Ressistance VR = Voltage doop across Inductor UL = 125 volt. Voltag, doop across capacitor Ve = 0.3183 10 And