Package: Fundamentals Of Electric Circuits With 2 Semester Connect Access Card
6th Edition
ISBN: 9781259967542
Author: Alexander
Publisher: MCG
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Chapter 13, Problem 9RQ
To determine
Choose the correct option, which is needed for matching the internal impedance of
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A network is composed of the utility having Ssc=500MVA, and an 800KVA transformer, rated at 20KV/410V (no load), whose voltage impedance is 5%, and whose load losses are 5400watts. the short circuit at the secondary of the transformer using the impedance method is:
Select one:
a)30.5KA
b)None of these
c)45.8KA
d)21.83KA
3. A 20kVA, single-phase transformer is tested on both open-circuit and short-circuit conditions, losses thus measured being 200W and 360W respectively. Calculate the
(a) Efficiency when supplying half full load at a power factor of 0.9.
(b) Load corresponding to maximum efficiency.
Efficiency =
Load corresponding to maximum efficiency =
We want to build an impedance matching transformer that matches the output impedance of an amplifier connected to the primary, with a number of turns Np, whose impedance is 600 Ω, with an 8Ω speaker connected to the secondary, with a number of turns Ns. The Np/Ns transformation ratio of the matcher is:
answer:8,66
Chapter 13 Solutions
Package: Fundamentals Of Electric Circuits With 2 Semester Connect Access Card
Ch. 13.2 - Determine the voltage Vo in the circuit of Fig....Ch. 13.2 - Determine the phasor currents I1 and I2 in the...Ch. 13.3 - Prob. 3PPCh. 13.4 - Find the input impedance of the circuit in Fig....Ch. 13.4 - For the linear transformer in Fig. 13.26(a), find...Ch. 13.4 - Solve the problem in Example 13.1 (see Fig. 13.9)...Ch. 13.5 - The primary current to an ideal transformer rated...Ch. 13.5 - In the ideal transformer circuit of Fig. 13.38,...Ch. 13.5 - Find Vo in the circuit of Fig. 13.40. Figure 13.40...Ch. 13.6 - Refer to Fig. 13.43. If the two-winding...
Ch. 13.6 - In the autotransformer circuit of Fig. 13.45, find...Ch. 13.7 - Prob. 12PPCh. 13.8 - Prob. 13PPCh. 13.9 - Refer to Fig. 13.61. Calculate the turns ratio...Ch. 13.9 - Calculate the turns ratio of an ideal transformer...Ch. 13.9 - In Example 13.17, if the eight 100-W bulbs are...Ch. 13 - Refer to the two magnetically coupled coils of...Ch. 13 - Prob. 2RQCh. 13 - Prob. 3RQCh. 13 - Prob. 4RQCh. 13 - The ideal transformer in Fig. 13.70(a) has N2/N1 =...Ch. 13 - Prob. 6RQCh. 13 - A three-winding transformer is connected as...Ch. 13 - Prob. 8RQCh. 13 - Prob. 9RQCh. 13 - Prob. 10RQCh. 13 - For the three coupled coils in Fig. 13.72,...Ch. 13 - Using Fig. 13.73, design a problem to help other...Ch. 13 - Two coils connected in series-aiding fashion have...Ch. 13 - (a) For the coupled coils in Fig. 13.74(a), show...Ch. 13 - Two coils are mutually coupled, with L1 = 50 mH,...Ch. 13 - Given the circuit shown in Fig. 13.75, determine...Ch. 13 - For the circuit in Fig. 13.76, find Vo. Figure...Ch. 13 - Find v(t) for the circuit in Fig. 13.77.Ch. 13 - Prob. 9PCh. 13 - Find vo in the circuit of Fig. 13.79. Figure 13.79...Ch. 13 - Use mesh analysis to find ix in Fig. 13.80, where...Ch. 13 - Determine the equivalent Leq in the circuit of...Ch. 13 - For the circuit in Fig. 13.82, determine the...Ch. 13 - Obtain the Thevenin equivalent circuit for the...Ch. 13 - Find the Norton equivalent for the circuit in Fig....Ch. 13 - Obtain the Norton equivalent at terminals a-b of...Ch. 13 - In the circuit of Fig. 13.86, ZL is a 15-mH...Ch. 13 - Find the Thevenin equivalent to the left of the...Ch. 13 - Determine an equivalent T-section that can be used...Ch. 13 - Determine currents I1, I2, and I3 in the circuit...Ch. 13 - Prob. 21PCh. 13 - Find current Io in the circuit of Fig. 13.91.Ch. 13 - Let is = 5 cos (100t) A. Calculate the voltage...Ch. 13 - In the circuit of Fig. 13.93, (a) find the...Ch. 13 - Prob. 25PCh. 13 - Find Io in the circuit of Fig. 13.95. Switch the...Ch. 13 - Find the average power delivered to the 50-...Ch. 13 - In the circuit of Fig. 13.97, find the value of X...Ch. 13 - Prob. 29PCh. 13 - (a) Find the input impedance of the circuit in...Ch. 13 - Using Fig. 13.100, design a problem to help other...Ch. 13 - Two linear transformers are cascaded as shown in...Ch. 13 - Determine the input impedance of the air-core...Ch. 13 - Using Fig. 13.103, design a problem to help other...Ch. 13 - Find currents I1, I2, and I3 in the circuit of...Ch. 13 - As done in Fig. 13.33, obtain the relationships...Ch. 13 - A 2402,400-V rms step-up ideal transformer...Ch. 13 - Design a problem to help other students better...Ch. 13 - A 1,200240-V rms transformer has impedance on the...Ch. 13 - The primary of an ideal transformer with a turns...Ch. 13 - Given I2 = 2 A, determine the value of Is in Fig....Ch. 13 - For the circuit in Fig. 13.107, determine the...Ch. 13 - Obtain V1 and V2 in the ideal transformer circuit...Ch. 13 - In the ideal transformer circuit of Fig. 13.109,...Ch. 13 - For the circuit in Fig. 13.110, find the value of...Ch. 13 - (a) Find I1 and I2 in the circuit of Fig. 13.111...Ch. 13 - Prob. 47PCh. 13 - Using Fig. 13.113, design a problem to help other...Ch. 13 - Find current ix in the ideal transformer circuit...Ch. 13 - Prob. 50PCh. 13 - Use the concept of reflected impedance to find the...Ch. 13 - For the circuit in Fig. 13.117, determine the...Ch. 13 - Refer to the network in Fig. 13.118. (a) Find n...Ch. 13 - A transformer is used to match an amplifier with...Ch. 13 - For the circuit in Fig. 13.120, calculate the...Ch. 13 - Find the power absorbed by the 100- resistor in...Ch. 13 - For the ideal transformer circuit of Fig. 13.122...Ch. 13 - Determine the average power absorbed by each...Ch. 13 - In the circuit of Fig. 13.124, let vs = 165...Ch. 13 - Refer to the circuit in Fig. 13.125 on the...Ch. 13 - For the circuit in Fig. 13.126, find Il, I2, and...Ch. 13 - For the network in Fig. 13.127, find: (a) the...Ch. 13 - Find the mesh currents in th circuit of Fig....Ch. 13 - For the circuit in Fig. 13.129. find the turns...Ch. 13 - Calculate the average power dissipated by the 20-...Ch. 13 - Design a problem to help other students better...Ch. 13 - An autotransformer with a 40 percent tap is...Ch. 13 - In the ideal autotransformer of Fig. 13.131,...Ch. 13 - In the circuit of Fig. 13.131, N1 = 190 turns and...Ch. 13 - In the ideal transformer circuit shown in Fig....Ch. 13 - When individuals travel, their electrical...Ch. 13 - In order to meet an emergency, three single-phase...Ch. 13 - Figure 13.135 on the next page shows a three-phase...Ch. 13 - Consider the three-phase transformer shown in Fig....Ch. 13 - A balanced three-phase transformer bank with the...Ch. 13 - Using Fig. 13.138, design a problem to help other...Ch. 13 - The three-phase system of a town distributes power...Ch. 13 - Use PSpice or MultiSim to determine the mesh...Ch. 13 - Use PSpice or MultiSim to find I1, I2, and I3 in...Ch. 13 - Prob. 80PCh. 13 - Use PSpice or MultiSim to find I1, I2, and I3 in...Ch. 13 - A stereo amplifier circuit with ail output...Ch. 13 - A transformer having 2,400 turns on the primary...Ch. 13 - A radio receiver has an input resistance of 300 ....Ch. 13 - A step-down power transformer with a turns ratio...Ch. 13 - A 240120-V rms power transformer is rated at 10...Ch. 13 - A 4-kVA, 2,400240-V rms transformer has 250 turns...Ch. 13 - A 25,000240-V rms distribution transformer has a...Ch. 13 - A 4,800-V rms transmission line feeds a...Ch. 13 - A four-winding transformer (Fig. 13.146) is often...Ch. 13 - A 440/110-V ideal transformer can be connected to...Ch. 13 - Ten bulbs in parallel are supplied by a 7,200120-V...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Similar questions
- The impedance value for a network containing the utility and a transformer is Select one: None of these Zt=√(〖((Ztranformer)〗2+〖((Zutility)〗2 Zt=Ztransformer+Zutility Zt=√(〖((Xtranformer+Xutility)〗2+〖((Rtranformer+Rutility)〗2arrow_forwardA network is composed of the utility having Ssc=500MVA, and an 800KVA transformer, rated at 20KV/410V (no load), whose voltage impedance is 5%, and whose load losses are 5400watts. the short circuit at the secondary of the transformer using the impedance method is: Select one: 45.8KA None of these 21.83KA 30.5KAarrow_forwardplease solve A 10 kVA, 500/250 V, single phase transformer has itsmaximum efficiency of 94% when delivering 90% ofits rated output at unity p.t. Estimate its efficiency whendelivering its full load output at p.t. of 0.8 lagging.arrow_forward
- F.a. In a step-up transformer having a 1 to 2 turn ratio, the 12-V secondary provides 5 A to the load. The primary current isA. 20 AB. 5 AC. 10 AD. 2.5 A F.b. Which one of the following voltages is typical of a value used by utilities for long-distance transmission of electrical power?A. 4800 VB. 345,000 VC. 240 VD. 120 Varrow_forwardA 500kVA transformer has an open circuit test of 600W and the full load short circuit test of 700W, if the power factor of the transformer is 0.8 lagging, calculate theefficiency of the transformer and maximum efficiency transformerarrow_forwardA 2.4-kVA, 2400/240-V, 50-Hz, step-down transformer has the followingparameters: R, = 1.5 a, X, = 2.5 R, R, = 0.02 a, X, = 0.03 Q, R,, = 6 kR,and X,, = 8 kR. It is operating at 80% of its load at unity power factor.Using the exact equivalent circuit embodying the ideal transformer, determine the efficiency of the transformer. Also sketch its phasor diagram.arrow_forward
- A 250kVA single-phase transformer has an iron loss of 2kW and the maximumefficiency at 0.8 P.F occurs when the load is 150kW, calculate1- the maximum efficiency at unity P.F.2- the efficiency on full-load at 0.707 P.F.arrow_forwardA 2,200/250-V transformer takes 8 A at a p.f. of 0.3 on open circuit. a. Find working components of no-load primary current. Note: use four decimal places b. Find magnetising components of no-load primary current. Note: use four decimal placesarrow_forwardParameters of a 20 kVA, 2200/220 V, 50 Hz distribution transformer, R1 = 5 Ω R2 = 0.04 Ω Rc = 3000 Ω X1 = 15 Ω X2 = 0.14 Ω Xm = 2500 Ω given as. According to this, a) Find the equivalent circuit transferred to the high voltage side. b) When the transformer is operating at its rated load, the load voltage is 220 V and the power factor is 0.8 behind. Via the equivalent circuit you got above, b1) Input current, (I1 =?) b2) Input voltage, (V1 =?) b3) Input power factor, (φ1 =?) b4) Copper and core losses, (Pcu = ?, Pc =?) b5) Efficiency, (η =?)arrow_forward
- Q22) A 5KVA single phase transformer has a truns ratio of 10:1 and is fed from a 2.5kV supply. Neglecting losses, i) Calculate the full-load secondary current. ii) Estimate the minimum load resistance which can be connected across the secondary winding to give full load K iii) Calculate the primary current at full load KVA.arrow_forward4.- A 20-kVA , 8000 V / 277 V transformer has the following resistances andreactance's:RP = 32Ω RS = 0.05ΩXP = 45Ω XS = 0.06ΩRC = 250 KΩ XM = 30 KΩThe excitation branch impedances are given referred to the high-voltage side of the transformer.a.- Find the equivalent circuit of this transformer referred to the high-voltage side.b.- Assume the transformer is supplying rated load at 277 V and 0.8 pf lagging. Whatis this transformer’s input voltage? (tip: assume the current through XM and RC is very small … negligible)arrow_forwardsingle coil 600 turns instrument transformer, operating in the step-down mode with a 40 percent tap, supplies a 5 kVA, 0.88 power factor inductive load. The input to the transformer is 3.3 kV, 50 Hz. Assume that leakage effects and minor losses in transformer are negligible. Determine the following : (0) Turn ratio; (ii) Load current(in Amp); (iii) Incoming line current(in Amp); (iv) Transformed current (in Amp); (v) Apparent power conducted(in kVA)and (vi) Apparent power transformed"arrow_forward
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