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1. A relay coil with power factor of 0.81 lagging draws 60mA from a 24V, 60 Hz source. a) Find the resistance of the coil. b) Find the inductance of the coil

1. A relay coil with power factor of 0.81 lagging draws 60mA from a 24V, 60 Hz source. a) Find the resistance of the coil. b) Find the inductance of the coil

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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1. A relay coil with power factor of 0.81 lagging draws 60mA from a 24V, 60 Hz source. a) Find the resistance of the coil. b) Find the inductance of the coil 2. A 110 V, 50 Hz source is connected to a parallel RLC circuit where R = 200, L = 100mH and C = 150µF. Calculate Active, Reactive and Apparent power of the circuit. 3. A balanced load with an impedance of 52445° in each arm is delta connected ba three phase Y source with line-to-line voltage of 208V. Find a) Phase current in load b) Total active power absorbed by the load c) Total Reactive power absorbed by the load d) Total apparent power delivered by source to load 4. An induction motor draws 4.5 A at a 0.75 lagging power factor from a 208V, 60 Hz source. a) What value of capacitance must be connected in parallel with the motor to raise the overall p.f. to 1. b) Calculate the magnitudes of the motor current, capacitor current and source current with the capacitor in place. 5. A3-phase Y-connected motor is connected to a three phase Y-connected source with 440V line voltage. It draws a line current of 5A from the source. If the power factor of the motor is 0.8, calculate a) Active power and Reactive power absorbed by the load b) Total Apparent power
Transcribed Image Text:1. A relay coil with power factor of 0.81 lagging draws 60mA from a 24V, 60 Hz source. a) Find the resistance of the coil. b) Find the inductance of the coil 2. A 110 V, 50 Hz source is connected to a parallel RLC circuit where R = 200, L = 100mH and C = 150µF. Calculate Active, Reactive and Apparent power of the circuit. 3. A balanced load with an impedance of 52445° in each arm is delta connected ba three phase Y source with line-to-line voltage of 208V. Find a) Phase current in load b) Total active power absorbed by the load c) Total Reactive power absorbed by the load d) Total apparent power delivered by source to load 4. An induction motor draws 4.5 A at a 0.75 lagging power factor from a 208V, 60 Hz source. a) What value of capacitance must be connected in parallel with the motor to raise the overall p.f. to 1. b) Calculate the magnitudes of the motor current, capacitor current and source current with the capacitor in place. 5. A3-phase Y-connected motor is connected to a three phase Y-connected source with 440V line voltage. It draws a line current of 5A from the source. If the power factor of the motor is 0.8, calculate a) Active power and Reactive power absorbed by the load b) Total Apparent power
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