EBK DELMAR'S STANDARD TEXTBOOK OF ELECT
6th Edition
ISBN: 9781305537125
Author: Herman
Publisher: YUZU
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Chapter 12, Problem 6RQ
What is used to hold a sulfate ion together?
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Design 5th order LPF with gain = Yo
cut of freq=10KHZ
The current coil of a wattmeter is connected in the red
line of a three-phase system. The voltage circuit can be
connected between the red line and either the yellow
line or the blue line by means of a two-way switch.
Assuming the load to be balanced, show with the aid
of a phasor diagram that the sum of the wattmeter
indications obtained with the voltage circuit connected
to the yellow and the blue lines respectively gives the
total active power.
A wattmeter has its current coil connected in the yellow
line, and its voltage circuit is connected between the
red and blue lines. The line voltage is 400 V and the
balanced load takes a line current of 30 A at a power
factor of 0.7 lagging. Draw circuit and phasor diagrams
and derive an expression for the reading on the wattmeter
in terms of the line voltage and current and of the phase
difference between the phase voltage and current.
Calculate the value of the wattmeter indication.
ANS:
. Line amperes × line volts × sin φ = 8750 var
Chapter 12 Solutions
EBK DELMAR'S STANDARD TEXTBOOK OF ELECT
Ch. 12 - 1. Conduction in a liquid depends on the movement...Ch. 12 - What is a negative ion?Ch. 12 - 3. What is a positive ion?
Ch. 12 - Name three basic substances that can be used to...Ch. 12 - What is an electrolyte?Ch. 12 - 6. What is used to hold a sulfate ion together?
Ch. 12 - What is the negative terminal of a power source...Ch. 12 - Prob. 8RQCh. 12 - What determines the thickness of the coating...Ch. 12 - What is electrolysis?
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- Don't use ai to answer I will report you answerarrow_forwardDiscuss the importance of power-factor correction in a.c. systems. A 400 V, 50 Hz, three-phase distribution system supplies a 20 kVA, three-phase induction motor load at a power factor of 0.8 lagging, and a star-connected set of impedances, each having a resistance of 10 Ω and an inductive reactance of 8 Ω. Calculate the capacitance of delta-connected capacitors required to improve the overall power factor to 0.95 lagging. ANS: 75 µF/pharrow_forwardA 3-phase, wye-connected generator induces 2400 V in each of its windings. Calculate the line voltage.arrow_forward
- why Low Pass filter (LPF) R₁C=S V₁ R т Tc Voarrow_forwardDon't use ai to answer I will report you answerarrow_forwardA 60hp,3-phase motor absorbs 50 kW from a 600 V,3-phase line. If the line current is 60 A, calculate the following: a. The efficiency of the motor b. The apparent power absorbed by the motor c. The reactive power absorbed by the motor and the power factor of the motorarrow_forward
- Three 15Ω resistors and three 8Ω reactors are connected as shown in Fig. 18. If the line voltage is 530 V, calculate the following: a. The active, reactive, and apparent power supplied to the 3 -phase load b. The voltage across each resistorarrow_forwardThree resistors are connected in delta. If the line voltage is 13.2kV and the line current is 1202 A, calculate the following: A) the current in and the voltage acroos each resistor B) The power supplied to each resistor and the 3 phase load C) The ohmic value of each resistorarrow_forwardWith the aid of a phasor diagram show that the active power and power factor of a balanced three-phase load can be measured by two wattmeters. For a certain load, one wattmeter indicated 20 kW and the other 5 kW after the voltage circuit of this wattmeter had been reversed. Calculate the active power and the power factor of the load. ANS: 15 kW, 0.327arrow_forward
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