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Two wattmeters are properly connected to measure the total power drawn by a balanced 3-phase load. If the readings of the wattmeters are 3 kW and 1 kW, the latter being obtained after reversing the connections of its current coil. Find the pf of the load.

Two wattmeters are properly connected to measure the total power drawn by a balanced 3-phase load. If the readings of the wattmeters are 3 kW and 1 kW, the latter being obtained after reversing the connections of its current coil. Find the pf of the load.

Introductory Circuit Analysis (13th Edition)
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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Answer the following problems in a short/long bond paper size. Round off your answer up to 2 decimals, if applicable. Show your complete solution and box your final answer. You may not copy the problem. 1. Two wattmeters are properly connected to measure the total power drawn by a balanced 3-phase load. If the readings of the wattmeters are 3 kW and 1 kW, the latter being obtained after reversing the connections of its current coil. Find the pf of the load. 2. A7.5 hp, 230 V, 3-phase induction motor takes a line current of 18 A, when operating at rated output at an efficiency of 90%. Find the reading of a wattmeter when this is inserted to measure the 3-phase power drawn by the T-method. 3. A balanced delta-connected load is connected across a balanced 3-phase, 120 V, 60 Hz, 3-wire system. Two wattmeters are properly connected to measure the power drawn by the load. If the wattmeters read 1500 W and 500 W, find the complex impedance of the load per phase. 4. A balanced, 3-phase, 132 kV line supplies power to a balanced load that draws 70.7 MVA at 0.707 pf lagging. A delta-connected capacitor bank is connected in parallel to correct the pf to unity. Find the reactance per phase of the capacitor bank. 5. It is required to raise the power factor of a 750 kW balanced 3-phase load from 0.70 lagging to 0.90 lagging. The line voltage is 6.9 kV, 60 Hz. Find the capacitance per phase required for wye-connected capacitor bank.
Transcribed Image Text:Answer the following problems in a short/long bond paper size. Round off your answer up to 2 decimals, if applicable. Show your complete solution and box your final answer. You may not copy the problem. 1. Two wattmeters are properly connected to measure the total power drawn by a balanced 3-phase load. If the readings of the wattmeters are 3 kW and 1 kW, the latter being obtained after reversing the connections of its current coil. Find the pf of the load. 2. A7.5 hp, 230 V, 3-phase induction motor takes a line current of 18 A, when operating at rated output at an efficiency of 90%. Find the reading of a wattmeter when this is inserted to measure the 3-phase power drawn by the T-method. 3. A balanced delta-connected load is connected across a balanced 3-phase, 120 V, 60 Hz, 3-wire system. Two wattmeters are properly connected to measure the power drawn by the load. If the wattmeters read 1500 W and 500 W, find the complex impedance of the load per phase. 4. A balanced, 3-phase, 132 kV line supplies power to a balanced load that draws 70.7 MVA at 0.707 pf lagging. A delta-connected capacitor bank is connected in parallel to correct the pf to unity. Find the reactance per phase of the capacitor bank. 5. It is required to raise the power factor of a 750 kW balanced 3-phase load from 0.70 lagging to 0.90 lagging. The line voltage is 6.9 kV, 60 Hz. Find the capacitance per phase required for wye-connected capacitor bank.
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