Multiple choice questions: 1- A voltages of 50Hz transformer are 1500 V on primary and 600 V on the secondary. It has 1.5 V per turn. Then the number of turns on primary and secondary are ---------- a) 20 and 8 b) 100 and 10 c) 1000 and 120 d)1000 and 400 e) none of the previous. 2-A 600/200 V single phase transformer is supplying a load of 60 A at a p.f of 0.707 lag. The no load current is 3A at 0.2 P.f. lag. Then the primary current is ---- a) 63A b) 22.56A c) 69A d)24 e) 21.55 f) none of the previous. S 3- The silicon ratio in transformer iron cannot be increased greater than 5% because of- a) the iron loss will increase b) the hysteresis loss will increase c) the eddy current loss will increase d) none of the previous 4- If V1 = 400V and the wattmeter read 800W at no load test then the value of Ro is none of the previous a)100 b)4002 c) 200 d)160002 S

Multiple choice questions: 1- A voltages of 50Hz transformer are 1500 V on primary and 600 V on the secondary. It has 1.5 V per turn. Then the number of turns on primary and secondary are ---------- a) 20 and 8 b) 100 and 10 c) 1000 and 120 d)1000 and 400 e) none of the previous. 2-A 600/200 V single phase transformer is supplying a load of 60 A at a p.f of 0.707 lag. The no load current is 3A at 0.2 P.f. lag. Then the primary current is ---- a) 63A b) 22.56A c) 69A d)24 e) 21.55 f) none of the previous. S 3- The silicon ratio in transformer iron cannot be increased greater than 5% because of- a) the iron loss will increase b) the hysteresis loss will increase c) the eddy current loss will increase d) none of the previous 4- If V1 = 400V and the wattmeter read 800W at no load test then the value of Ro is none of the previous a)100 b)4002 c) 200 d)160002 S

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

WILL SURELY GIVE AN UPVOTETOPIC: AC MACHINE INSTRUCTIONS Please write clearly and understandable wayWrite all the corresponding Given with their corresponding symbols and unitsSolve in step-by-step, no shortcut (I need to learn as a beginner)Underline twice the Final Answer PROBLEM:A single-phase transformer has a voltage ratio on open-circuit of 3300/660-V. The primary and secondary resistances are 0.82 and 0.03 respectively, the corresponding leakage reactance being 4 2 and 0.12 0. The load is equivalent to a coil of resistance 4.8Q and inductive reactance 3.60. Determine the output of the transformer in kW.a. 54b. 108c. 63d. 27
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
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
6-Writ the procedure of no load test of Single phase transformer and draw the connection diagram of this test
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
solve with transformators topic With a ratio of turns of 10 to 1 and an input voltage of 120V and output 12 V, propose a system of transformer and turns
925 3- The approximate equivalent circut of is to be determined. The open-circuit at 0 20KVA, 8000/240 V 60 Hz transformar short-circut tests that were performed transformer. primary side gave the following results. Open - Circut Test V₁x = 8000 Iloc=0-214 A Ploc = 400 W Short-Circuit Test |Visc = 489V 5₁s = 2.5A Pisc = 240k/ al Find the components of the magnetising branch i referred to the primary side b) Find the Components of the equivalent series impedence referred to the primary side. 119 210 2 15 16
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
4. 100 kVA, 6800-240 V, 50 Hz single phase step down transformer has the following parameters: RLs-0.008Ω RHs-2.6Ω Ri-HS-500 0Ω XLS-0.015Ω XHs=5.22 Xm,HS=88002 Transformer is delivering 80% of rated load at rated voltage and 0.95 lagging power factor. Determine the following: a) The equivalent impedance of the transformer referred to primary. b) Input impedance of the combined transformer and load. c) Actual input voltage at HV side. d) Input impedance if load is disconnected. e) Exciting current at no load.
Three single phase transformers are connected in a Delta-Wye configuration. Each transformer is rated 13kV/64kV. The transformers are connected to a 3 phase 13kV (L-L) supply and the balanced three phase load is 788KVA. What is the current magnitude in the secondary winding of each transformer? explain the steps too please
If the no load secondary voltage of a 1-phase transformer is 235 V and full load secondary voltage is 223 V, then the % regulation of the transformer is 5.38 52.69 12.00 31.63
You have a large single phase transformer with 7 tap settings (@ 0,+2,+4,+6% and -2,-4, and -6%) that lets you adjust the load voltage if necessary. The primary voltage is 4800V and the secondary voltage desired is 240V. Draw this arrangement with the 0% tap setting selected.