Answer question 4 10A. Calculate the power consumed of the load, loud impedance and power factor of theload.c) What is the difference between primary and secondary standards of measurements"Question 4a) The secondary winding burden of CT having a har primary and 240 secondary tuns, hasan ammete: resistance and reactance of I chm and 05 uhuns respeetively. The reSistanceof secondary winding is 0.5 chms and the reactance is 0.25 The core requires manf of 100AT for magrietisation and 50 AT for core losses. Determine the primary winding current.the actual trunsformation ratio when the ummeter reads SA, Ibe number of turns whichcould be recuced in the secondary winding so that the ration error comes zero.b) The fallowing readings were ohtained from three voltmeters used for single phase powermcusurements V2=200V across the non-inductive resistor, V3-220V aeross the mnductiveload, VI=350V across the two volimeers in weirs. Cakulate the power factor of the non-inductive load.c) Define PCLS and state their main advantages over hard wired relays.Question 5a) The series clunmeter in Fig. Q5. 1 below is made up of a 3 V hattery and a resistance R,which makes (RI + Rm) = 15 kn. (a) Determine the instrument indication when Rx =0. (b)Determine how the resistance scale shuld be marked at 0.5 FSD. 0.25 FSD, and 0 75 FSDResistance tabe measuredR.StandardresistanceMeterresietanceBattery+E,MrierFig. QS. 1h) An analog indicating instrument with a scale range of 0 to 50 V shows a voltage on 2 85V. The true value of the reading is 2.90 volts.

a. Given NP=1NS=240Rm=1 ΩXm=0.5 ΩRz=0.5 ΩXz=0.25 Ω

10A. Calculate the power consumed of the load, load impedance and power factor of the load. c) What is the difference between primary and secondary standards of measurements? Question 4 a) The secondary winding burden of CT having a har primary and 240 secondary turns, has an ammete: resistance and reactance of I chm and 05 uhms tespeetively. The resistance of secondary winding is 0.5 chms and the reactance is 0.25 The core requires munf of 100 AT for magnictisation and 50 AT for core losses. Determine the primary winding current. the actual trunsformation ratio when the ammeter reads 5A, Ihe numher of turns which could be recuced in the secondary winding sa that the ration error comes zero. b) The following readings were chtained from three voltmeters Ined for single phase power micasurements V2-200V across the non-inductive resistor, V3-220V across the nductive load, VI=350V acrmss the two volimerers in weirs. Cakculate the power factor of the non- inductive load. c) Define PCLS and stute their main advantages over hard wired relaye. Question 5 a) The series clunmeter in Fig. Q5. I below is made up of a 3 V hattery and a resistance R, which makes (RI + Ra)= 15 kn. (a) Determine the instrument indication when Rx -0. (b) Determine how the resistance scale should be marked at 0.5 FSD. 0.25 FSD, and 0 75 FSD Resistance ta be measured Sandard resistance R. Meier resistance Battery- Mrier Fig. QS. 1 b) An analog indicating instrument with a scale range of 0 to 50 V shows a voltage on 2 8! V. The true value of the reading is 2.90 volts.

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter2: Fundamentals

Section: Chapter Questions

Problem 2.48P