1. An electro-magnet draws 3 kW of active power and 4 kvar of reactive power. a. Calculate the apparent power. b. Calculate the power factor. 2. A capacitor drawing 4 kvar is placed in parallel with the electro-magnet of Question 1. a. Calculate the new value of apparent power b. What is the new value of reactive power? C. What is the value of active power? d. What is the new power factor?

1. An electro-magnet draws 3 kW of active power and 4 kvar of reactive power. a. Calculate the apparent power. b. Calculate the power factor. 2. A capacitor drawing 4 kvar is placed in parallel with the electro-magnet of Question 1. a. Calculate the new value of apparent power b. What is the new value of reactive power? C. What is the value of active power? d. What is the new power factor?

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter26: Three-phase Circuits

Section: Chapter Questions

Problem 3PA: You are an electrician working in an industrial plant. A 30-hp three-phase induction motor has a...

See similar textbooks

Similar questions

QUESTION 11 An inductor is connected in parallel with a 6540 resistor and a function generator. The applied voltage is 42V RMS and the total current is 67mA RMS. Find the magnitude of the current through the inductor. Enter your answer in the space provided. Round your answer to one decimal place. Your answer should be in mA but do not enter the unit.
a) What is the peak voltage across R2? b) What is the RMS value of I1?
Alternating voltage and current differ from direct voltage and current because alternating voltage and current a.)never change. b.)change polarity. c.)maintain a constant polarity. d.)are not real electricity The period (T) of a waveform is a.)unrelated to the frequency. b.) the reciprocal of the frequency. c.)equal to the frequency. d.)the reciprocal of the cycle
If there is reactive power associated with a circuit element we can say a) That said element is purely resistive. b) That said element has a unitary power factor c) That said element has associated electric or magnetic fields d) None of the above
A capacitor of 1µF is charged to 100 volts and then disconnected from the power supply. A second but uncharged capacitor of 3µF is then connected across the first capacitor. What is the voltage across the parallel combination? O a. 110 volts O b. 45 volts O c. 66 volts O d. 25 volts
A triangle waveform with following specifications in Table B1. Table B1 RMS Voltage 50mV Number of cycles/second 100 i) Sketch the approximate triangular waveform with all specifications. ii) A transformer has primary coil with 100 turns and secondary coil with 120 turns. Estimate the current in the secondary coil, If the current in the primary coil is 4 Ampere
a. individal current b. voltage source
Please show you detailed solution Number 10 A voltage of 250 volts at 50 Hz is impressed on a circuit having a 60-ohm resistor, 35-?F capacitor, and a 0.25-henry inductor in series. Determine power factor. A. 0.979 C. 0.924 B. 0.862 D. 0.707
What are the things common in direct current and alternating current. And also its Difference
What will be the value of the twiddle factor: W42
Can V curve be plotted for an alternator. If yes then what is the difference between V curve of an alternator and V curve of a motor.
A 5-ohm resistor is connected in series with a 25 micro-farad capacitor. A source voltage of 158 volts, 50 Hz supplies the combination. Determine the following: a. Circulating current b. Voltage across the resistor c. Voltage across the capacitor