25. The maximum instantaneous voltage and current output of an alternator are 300 V and 20 A, respectively. What is the power output in watts if the voltage leads the current by 30°. 26. A two-element series circuit with R = 15 N, L = 20 mH has an impedance of 30 ohms and an unknown angle. What is the frequency in Hz? 27. A 15mH pure inductance is connected in parallel with one microfarad capacitor and a 1kohm resistor. What frequency will the circuit be in resonance? 28. A 10 ohm resistor is connected in parallel to an impedance Z = 20 - j4 ohms. Find the circuit power factor? 29. The resistor of 100 ohms and unknown impedance coil in series draw 12 A from a 120 V, 60 Hz line. If the reactive power taken from the line is 1152 vars, what is the coil inductance? 30. A parallel circuit consists of a resistor having a conductance of 14 mhos, an inductive reactor having a susceptance of 8.8 mhos and a capacitive reactor having a susceptance of 15 mhos. What is the impedance of the circuit?
25. The maximum instantaneous voltage and current output of an alternator are 300 V and 20 A, respectively. What is the power output in watts if the voltage leads the current by 30°. 26. A two-element series circuit with R = 15 N, L = 20 mH has an impedance of 30 ohms and an unknown angle. What is the frequency in Hz? 27. A 15mH pure inductance is connected in parallel with one microfarad capacitor and a 1kohm resistor. What frequency will the circuit be in resonance? 28. A 10 ohm resistor is connected in parallel to an impedance Z = 20 - j4 ohms. Find the circuit power factor? 29. The resistor of 100 ohms and unknown impedance coil in series draw 12 A from a 120 V, 60 Hz line. If the reactive power taken from the line is 1152 vars, what is the coil inductance? 30. A parallel circuit consists of a resistor having a conductance of 14 mhos, an inductive reactor having a susceptance of 8.8 mhos and a capacitive reactor having a susceptance of 15 mhos. What is the impedance of the circuit?
Power System Analysis and Design (MindTap Course List)
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 2.7P: Let a 100V sinusoidal source be connected to a series combination of a 3 resistor, an 8 inductor,...
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Answer number 28.write your solution pls
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