Introductory Circuit Analysis
13th Edition
ISBN: 9780133923919
Author: Boylestad, Robert L.
Publisher: Pearson Education
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Textbook Question
Chapter 23, Problem 24P
Determine the primary and secondary voltages and currents for the autotransformer in Fig. 23.67.
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Q26/B
Discuss the current transformer with neat schematic diagram.
Q23. If DC voltage of 240 V is connected to the primary of a transformer having 1:10 turns ratio, then the voltage across the secondary winding will be.
A. What are the various causes of voltage drop in atransformer?
B. A single phase transformer has arated secondary voltage of (230v).when Loaded by a purely inductive load to its rated Value of current ,its terminal voltage drops to (200 v). Calculate its regulation and efficiency.
Chapter 23 Solutions
Introductory Circuit Analysis
Ch. 23 - For the air-core transformer in Fig. 23.57: Find...Ch. 23 - Repeat Problem 1 if k is changed to 1. Repeat...Ch. 23 - RepeatProblem1fork=0.3,NP=300turns,andNS=25turns.Ch. 23 - For the iron-core transformer (k = 1) in Fig....Ch. 23 - RepeatProblem4forNP=240andNS=30.Ch. 23 - Find the applied voltage of an iron-core...Ch. 23 - If the maximum flux passing through the core of...Ch. 23 - For the iron-core transformer in Fig. 23.59: Find...Ch. 23 - Find the input impedance for the iron-core...Ch. 23 - Find the voltage Vg, and the current Ip if the...
Ch. 23 - If VL=240V,ZL=20resistor,Ip=0.05AandNs=50 find the...Ch. 23 - If Np400,Ns=1200andVg=100V,findthemagnitudeofIp...Ch. 23 - For the circuit in Fig. 23.60, find the...Ch. 23 - For the transformer in Fig. 23.61, determine the...Ch. 23 - For the transformer in Fig. 23.61, if the...Ch. 23 - Prob. 16PCh. 23 - Discuss in your own words the frequency...Ch. 23 - Determine the total inductance of the series coils...Ch. 23 - Determine the total inductance of the series coils...Ch. 23 - Determine the total inductance of the series coils...Ch. 23 - Write the mesh equations for the network in Fig....Ch. 23 - Determine the input impedance to the air-core...Ch. 23 - An ideal transformer is rated...Ch. 23 - Determine the primary and secondary voltages and...Ch. 23 - For the center-tapped transformer in Fig. 23.42,...Ch. 23 - For the multiple-load transformer in Fig. 23.43,...Ch. 23 - Prob. 27PCh. 23 - Write the mesh equations for the network of Fig....Ch. 23 - Write the mesh equations for the network of Fig....Ch. 23 - A current transformer has a secondary with 250...Ch. 23 - Generate the schematic for the network in Fig....Ch. 23 - Prob. 32PCh. 23 - Using a transformer from the library find the load...
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- Calculate Required size of core and calculate number of turns in primary and secondary for small transformer whose, Output (secondary) voltage (Vs or Vo)= 12. V Output (secondary) current Io = 3 A Primary voltage, Vp = 230 V Supply frequency, f- 50 Hz Assume efficiency, 90%arrow_forward6. A generator delivers power through a transmission line at 23 kV. The resulting line loss across the 23-kV transmission line is 7.6 MW. To reduce the losses, a step-up transformer rated 23 KV/230 kV is used. What will be the new loss in MW across a 230-kV transmission line? (four decimal places)arrow_forward1. list the different losses which take place in atransformer. 2. What are the various causes of voltage drop in atransformer? 3. A single phase transformer has arated secondary voltage of (230v).when Loaded by a purely inductive load to its rated Value of current ,its terminal voltage drops to (200 v). Calculate its regulation and efficiency.arrow_forward
- Compute the load current of the transformer 1.5 kW, 440V/220V, 60 hz, and with a 0.68 reactive factor.arrow_forwardThe number of turns on the primary and secondary windings of a 1-o transformer are 407 35 respectively. If the primary is connected to a 2.4 kV, 50-Hz supply, determine the secondary voltage on no-load.arrow_forwardIn the Open-circuit test of the transformer (OC TEST), wattmeter measures 2 kW, in the short-circuit test of the transformer (SC TEST) wattmeter measures 200kW. Find the core loss of the transformer?arrow_forward
- Iron and copper losses in a 20 KVA, 2000/200 volt 1-phase transformer are 400 W and 500 W watts respectively. Find the efficiency at unity power factor full load and half load.arrow_forwardCompare and contrast diesel power plant with one of the existing power plant in the country in terms of: c. Effects to environmentarrow_forwardQ4: A 50 Hz, 11KV, 3-ph, alternator with earthed neutral has a reactance of 5 Ω\ ph and is connected to bus bar through a C.B. The distributed capacitance up to C.B between phase and neutral is 0.01μF, determine: 1-the recovery voltage across the contacts of the breaker, 2-the frequency of oscillation, 3- The restriking voltage across the contacts of the breaker, 4-the average rate of rise of restriking voltage up to the first peak, 5- the time to reach the peak restriking voltage, 6- the value of resistance to be used across the contacts of C.B. to eliminate the restriking voltage, and 7- the value of inductance and capacitance of this systemarrow_forward
- Based on Table Q1 (b), there are experiment for determine thebreakdown strength of transformer oil. Based on the observation,evaluate the breakdown voltage if the gap distance of electrodes is 2.5mm and sketch it in a relevant graph. Gap spacing (mm) 2 3 5 6Breakdown voltage (kV) 50 80 110 130arrow_forwardA generator delivers power through a transmission line at 23 kV. The resulting line loss across the 23-kV transmission line is 4.3 MW. To reduce the losses, a step-up transformer rated 23 KV/230 kV is used. What will be the new loss in MW across a 230-kV transmission line?arrow_forwardComplete the sentence The power factor must be close to ……………. To insure that losses in the transmission lines will be reducedarrow_forward
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