In class B amplifier ,what kind of design is used to avoid transformer usage? Capacitive Model Complementary symmetry Matched load O Tuned circuit
Q: In class B amplifier ,what kind of design is used to avoid transformer usage? O Matched load…
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- 03) The equivalent parameters of a transformer referred to the secondary-side are Reqs = 20 22 and Xegs 10 2. The load voltage is 6010° V, calculate the load impedance given that the source voltage referred to secondary side is 100Z0° V.Ideal transformer with primary of 200 turns and secondary of 100 turns. The primary is connected to 220 V, 50 Hz supply. Secondary is connected to a load of 500 W at unity power factor. Determine:a) Secondary voltage.b) Load current.c) Input current to primary.d) Load impedance.e) Input impedance on primary. please sovle only part (d) and (e)A-derive an equation for the copper saving in autotransformer. B- what are the disadvantages of the auto transformers? Alomar in unad to | 00 …....… -iete -----OSSO
- 3. A 220 V /345 kV, 200 kVA testing transformer to be used for cable testing has 10% leakage reactance and 2% resistance. The cable has to be tested at 600 kV, 60 Hz while charging current is 0.5A. Find the required value of the series inductor to be connected with the transformer to achieve resonance. Assume (Rind=1.8% of Xind). Find the primary voltage of the transformer during this test. Also calculate rated current of this transformer and the input power(A) Design a DC Power Supply Circuit with fix output (+5V & 3.3V) and variable output from (0 to 15V - 2A). Assume that the secondary output voltage of the transformer is 12Vrms for the standard 230v 50Hz.An OC relay having the Preset/Pickup value at 7.9 A is connected to a Current Transformer with nominal ratio =200:10 of CT, the Secondary impedance of CT is 0.092 ohm and Burden on CT is 0.9 ohm. The CT has the cross-sectional area of core to be 2.9x110-6 Cm². The current of excitation being 0.5 A and frequency of power system is 50 Hz. (Also the above CT will get saturate on the max flux density of 1.2 Tesla) (a) Solve for the E.M.F induced in the secondary of above CT. (b) Evaluate, whether the OC relay will operate or not? , when a fault current of 250 A flows in the primary line? (c) Solve the above scheme for finding the C.T saturation status (whether the CT operation is under the knee-point or beyond the knee-point of Saturation) (d) Solve for the error in CT ratio in percentage.
- low shows the circuit diagram of the linear variable differential transformer (LVDT). Figure 2 The primary coil is sinusoidally excited. (e) Clearly explain its operation when the core is moved from side to side (b) Given that the excitation frequency is much higher than the frequency of movement of the core, draw waveforms to show the output voltage for the following displacement waveforms. Xi Comment on your output waveforms.(5) Primary AC Source Transformer Secondary AC/DC Full-wave Rectifier Capaictor in Non- linear Load Figure 6 Analyse different methods of harmonics mitigation to eliminate the harmonic, which you have identify in above power system circuit. You can use harmonic filters, K or equivalent transformers or oversized neutral method depending upon the harmonic sources.4. A CT with an excitation curve given in the figure has a rated current ratio of 500:5 A and a secondary leakage impedance of 0.1 +j0.5 ohms. Calculate the CT secondary output current and the CT error for the following cases: a.) The impedance of the terminating device is 4.9 +j 0.5 ohms and the primary CT load current is 400 A. b.) The impedance of the terminating device is 4.9 +j0.5 ohms and the primary CT load current is 1200A c.) The impedance of the terminating device is 14.9 + j 1.5 ohms and the primary CT fault current is 400 A. d.) The impedance of the terminating device is 14.9 + j 1.5 ohms and the primary CT fault current is 1200 A w 100 80 60 40 20 2 4 6 10 Secondary exciting amps-, Secondary exciting volts-E'
- Design a CT-FWR to supply a load of (502) with a waveform of the following specifications: - • Vdc = 12 V • Ripple factor = 0.1 % • the main power supply is (220 Vrms, 50 Hz). Determine the following values: - 1- The value of capacitor filter. 2- The maximum load voltage (VmR) 3- The transformer turns ratio (a). 4- The RMS value of the load voltage. 5- Draw the output waveform. (assume ideal diodes)Q2) For the linear transformer shown in figure below, find: a) Construct a frequency – domain equivalent circuit of the system b) Calculate the self – impedance of the primary circuit. c) Calculate the self – impedance of the secondary circuit. d) Calculate the impedance reflected into the primary winding. e) Calculate the scaling factor of the reflected impedance. 42 -j62 1:2 ww 120/0° V rms 20 N llC2 (). Draw the transfer characteristics and explain the working of differential transformer and write any two applications of it (i)A 14 kVA, 54HZ, single-phase transformer has a tums ratio of 12:1 and is supplied from a 2.9 kV supply. Neglecting losses, determine (a) the secondary voltage, (b) the full load secondary current, (c) the maximum flux and (d) the minimum value of load resistance which can be connected across the secondary winding without the kVA rating being exceeded. Kindly enter the answers in the box and upload the handwritten steps of calculations as one file in the final exam answers submission link. Secondary voltage secondary current Maximum flux secondary resistance