A 1.5-kVA 240/120-volt single-phase transformer is serving a 10-ohm load connected at the low-voltage side. The transformer has a series impedance of 0.5+j1.2 ohms, referred to the low-voltage side. What is the resistance of the load as seen from the high-voltage side? Express your answer in ohms. Answer:

A 1.5-kVA 240/120-volt single-phase transformer is serving a 10-ohm load connected at the low-voltage side. The transformer has a series impedance of 0.5+j1.2 ohms, referred to the low-voltage side. What is the resistance of the load as seen from the high-voltage side? Express your answer in ohms. Answer:

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

See similar textbooks

Similar questions

In single phase transformer, if the secondary turns N2 is greater than the primary turns N1, then what is the relation between V2 and V1? O a. V2 = V1 O b. V2 > V1 O c. V1 < V2 O d. V2 < V1
The number of turns on the primary and secondary windings of a 1- transformer are 380 and 40 respectively. If the primary is connected to a 2.2 kV, 50-Hz supply, then the secondary voltage on no-load is
Three single phase 11000/220 V transformers are connected to form 3-phase transformer bank. High voltage side is connected is star, and low voltage side is in delta. What are the voltage ratings and turn ratio of 3-phase transformer? 19052 a) V, 50 220 11000 381 c) V, 50 √3 b) d) 19052 220 V, 50√3 11000 220 7.50
Q2/A/ What are the conditions for satisfying parallel operation of single phase transformer? Deduce an expression for the load shared by the two transformers in parallel when the transformers have equal voltage ratio? Prove your answer. B/ A 50 KVA, 2300/230 V, 60 11z transformer has a high voltage winding resistance of 0.650 and a low-voltage winding resistance of 0.0065 2. Laboratory tests showed the following results: Open circuit test: V = = 230 V, I =5.7A, P = 190 W Short circuit test: V-41.5 V, I-21.7 A, P-No wattmeter was used. 18 (2) Compute the value of primary voltage needed to give rated secondary voltage when the transformer is connected as a step-up one and is delivering 50 KVA at a power factor of 0.8 lagging. (b) Compute the efficiency under conditions of part (a).
A Cock-croft Walton type voltage multiplier has 7 stages with capacitance all equal 0.07pF. The supply a frequency of to be supplied is 6.5mA. to transformer secondary voltage is 133kV at 250HZ. If the load current The total voltage ripple of the system is: (a) 15.3kv (b) 12.2kv (c) 9.1kV (d) 10.4kv (e) 1.9kv a. d O b. a OC C O d. e O e. b
Ql-phase step down transformer 1250 KVA, 10002200 V, 50 Hz The resistance /phase and leakage reactanceiphase of the primary winding are 0.78 2 and 4.82 and the corresponding values for the secondary winding are 0.012 and 0.002 respectively if the primary winding is connected in delta and secondary in star calculate: )The voltage to be applied at normal frequency to the primary to circulate full-load through it when the secondary is short-circuited li) The full load copper loss
Two transformers are to be operated in parallel such that they share load in proportion to their KVA rating. The rating of the first transformer is 500 kVA and its pu leakage impedance is 0.05 pu. If the rating of second transformer is 250 kVA, then its pu leakage impedance is A 0.20 B 0.10 C 0.05 D 0.025
A 120 kVA, 1350/330 V single phase transformer has the following parameters: R1 = 0.34 Q, X1 = 0.59 0, R2 = 0.014 Q, X1 = 0.029 Q, Rc = 380 and Xm = 320 Q. The no load current is 4.7 A at a power factor of 0.36 lagging and the no load losses are 4.6 kW. For a full load and 0.9 power factor lagging with 300 V load terminal voltage, determine (a) equivalent circuit parameters referred to primary side, (b) percentage regulation and (c) full load efficiency. O:01 AM
a single-phase transformer serves a 7.2kw resistive loadlocated 200 ft from the transformer. each conductor from the transformer to load has an impedence of (0.78+j0.052) ohms per 1000ft. if the voltage at the load terminal is 240v, the magnitude of the voltage (v) at the transformer secondary is most nearly:
You are a journeyman electrician working in an industrial plant. You are to install transformers that are to be connected in open-delta. Transformer A must supply its share of the three-phase load. Transformer B is to be center-tapped so it can provide power to single-phase loads as well as its share of the three-phase load. The total connected three-phase load is to be 40 kVA, and the total connected single-phase load is to be 60 kVA. The transformers are to have a capacity 115% greater than the rated load. What is the minimum kVA rating of each transformer?
Q/A single-phase transformer with a capacity of 100 kVA and a voltage of 2000/400 and the equivalent circuit elements are: As follows R1 = 0.1 02 x1 = 0.2 2 R2 = 0.25 2 X2 = 0.75 2 RO = 500 XO = 150 Q and feeds a load of 90 kVA at a voltage of 2000 volts and a power factor of 8.0 in delay. Calculate voltage and current Primary Royl ww JX eql
A short transmission line connects a step-up transformer on the source side with a series impedance of j0.5 ohms (referred to the primary) to a step-down transformer on the load side with a series impedance of 50 ohms (referred to the primary). The turn ratio of the step-up transformer is 1:10 and a no-load primary voltage of 23 (line-to-line) kV. The step-down transformer has a turn ratio of 35:2 and it has a Y-connected, balanced load of 0.490 +j 0.0816 ohms connected to its secondary side. A capacitor bank of -j0.171 ohms is added parallel to the load. Assuming an ideal transmission line, the load voltage (line-to-neutral) would be: O A. 7360 V O B. 6.2 kV O C. 12750 V O D. 4806 V O E. None of the other choices are correct