please help me in 1 1. Two wattmeters connected to measure the input to a balanced three-phase circuit indicate 2500 Wand 500 W respectively. Find the power factor of the circuit (a) when both readings are positive and (b) whenthe latter reading is obtained after reversing the connections to the current coil of one instrument.|(a) 0.655 (b) 0.3591] (City & Guilds, London)2. A 400-V, 3-phase induction motor load takes 900 kVA at a power factor of 0.707. Calculate the kVArating of the capacitor bank to raise the resultant power factor of the installation of 0.866 lagging.Find also the resultant power factor when the capacitors are in circuit and the motor load has fallen to300 kVA at 0.5 power factor.3. Two wattmeters measure the total power in three-phase circuits and are correctly connected. Onereads 4,800 W while other reads backwards. On reversing the latter, it reads 400 W. What is the total powerabsorbed by the circuit and the power factor?4. The power taken by a 3-phase, 400-V motor is measured by the two wattmeter method and thereadings of the two wattmeters are 460 and 780 watts respectively. Estimate the power factor of the motorand the line current.|296 kVA, 0.998 leading] (City & Guilds, London)[4400 W; 0.49| (Sheffield Univ. U.K.)[0.913, 1.96 AJ (City & Guilds, London)5. Two wattmeters, W, and W, connected to read the input to a three-phase induction motor runningunloaded, indicate 3 kW and 1 kW respectively. On increasing the load, the reading on W, increases whilethat on W, decreases and eventually reverses.Explain the above phenomenon and find the unloaded power and power factor of the motor.12 kW, 0.287 lag] (London Univ.)6. The power flowing in a 3-0, 3-wire, balanced-load system is measured by the two wattmetermethod. The reading on wattmeter A is 5,000 W and on wattmeter B is – 1,000 W(a) What is the power factor of the system?(b) If the voltage of the circuit is 440, what is the value of capacitance which must be introduced intoeach phase to cause the whole of the power measured to appear on wattmeter A?10.359; 5.43 (Meters and Meas. Insts. A.M.I.E.E. London)inn 1. -L-

Given : W1=2500 w , W2= 500 w find the power factor

1. Two wattmeters connected to measure the input to a balanced three-phase circuit indicate 2500 W and 500 W respectively. Find the power factor of the circuit (a) when both readings are positive and (b) when the latter reading is obtained after reversing the connections to the current coil of one instrument. |(a) 0.655 (b) 0.3591] (City & Guilds, London)

1. Two wattmeters connected to measure the input to a balanced three-phase circuit indicate 2500 W and 500 W respectively. Find the power factor of the circuit (a) when both readings are positive and (b) when the latter reading is obtained after reversing the connections to the current coil of one instrument. |(a) 0.655 (b) 0.3591] (City & Guilds, London)

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...

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