(nter -Tapped Trenformer DI Rs Vs = 40 11 N. = 2 VS NS1 %3D Np Nz= 10 Rs =30 RL- 300 RL %3D Vs is the magnitude of the AC Souree/ - VL + NS2 AsSume ideal oficole and idral transformer D2 What is the value of VL(peak)?
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- all äabl (CME 446) 1 If F3=0.1 and Z3=45 Q, then the impedance of the next stage in the multi-section transformer is: of O a. 40.5 stion O b. 49.5 O C. 55 O d. None O e. 36.8 s page Next pageWhat is capacitance voltage transformer?The primary ofa certain transformer takes 1 A at a power factor of 0.4 when connected across a 230 V, 50 Hz supply and the secondary is on open circuit. The number of turns on the primary is twice that on the secondary. A load taking 50 A at a lagging power factor of 0.8 is now connected across the secondary. Sketch, and explain briefly, the phasor diagram for this condition, neglecting voltage drops in the transformer. What is now the value of the primary current?
- The primary of a certain transformer takes 1 A at a power factor of 0.4 when connected across a 230 V, 50 Hz supply and the secondary is on open circuit. The number of turns on the primary is twice that on the secondary. A load taking 50 A at a lagging power factor of 0.8 is now connected across the secondary. Sketch, and explain briefly, the phasor diagram for this condition, neglecting voltage drops in the transformer. What is now the value of the primary current?A transformer has primary and secondary turns of 1250 and 125 respectively. It has core cross-sectionof 36 cm2 and its rms flux density is to be limited to 1.4 T (to prevent core saturation). Whatmaximum 50 Hz voltage can be applied on the primary side and the corresponding open-circuitsecondary voltage?The core has a mean length of 150 cm and its relative permeability can be assumed to be 8000. Whatwould be the rms exciting current when the transformer’s primary winding is excited at a voltage ascalculated above? Also calculate the magnetizing susceptance as seen from primary and secondarysides.If the transformer were to be excited at 60 Hz, 1. What should be the maximum primary voltage for thecore flux density limit not to be exceeded? 2. What would be the magnetizing susceptance as seen oneach side in this case?Draw the full-wave voltage doubler circuit diagram. When a 1:4 transformer is used in this circuit andIf Vo=12sin(314t) alternative signal is obtained at the output, the frequency of the input signal, maximum and rmsCalculate its value.
- D = 0.9 1.5° and B = 150 65° has at the load end a The load voltage and current are V₁ and I₁ A' B' VL B][Y and evaluate these constants. C' D' IL A long line with A transformer having series impedance Zr Obtain expression for Vs and Is in the form 10067°. [$]-[ =The resistance and reactance of the primary winding of a 440/110 V single phase transformer are 4.4 ohm and 8 ohm respectively. The resistance and reactance of the secondary winding are 1.6 ohm and 2ohm respectively. Then find the equivalent resistance, reactance and impedance referred to the primary side.Q-3 A Cockeroft-Walton type voltage multiplier has ten stages with capacitances, all equal to 0.1 µF. The supply transformer secondary voltage is 100 kV at a frequency of 60 Hz. If the load current to be supplied is 5 mA, find (a) the percentage ripple, (b) the regulation, and (c) the optimum number of stages for minimum regulation or voltage drop.
- A transformer having a nominal voltage = 399V and a no load voltage = 420V at its secondary, the short circuit current at the secondary of this transformer in function of its nominal current will be: Select one: Isc=10*In None of these Isc=30*In Isc=20*In Isc=40*InQ5. For the following center tapped transformer, show the waveform across each half of the secondary winding and across R, when a 100 V peak sine wave is applied to the primarywinding. What is the PIV rating must the diodeshave? (Use constant voltage drop model for the Silicon diode) D IN4001 OV 10 kN IN4001 DELLIf the capacitor is now removed from the above circuit and is placed in parallel with the secondary of the transformer, redraw the circuit diagram and recalculate parts a. to d. in question (i). Draw the phasor diagram for both series and parallel RLC circuits in parts (i) and (ii). Discuss the effects of changing the capacitor connection in parallel on the power factor of the circuit.