Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN: 9780133923605
Author: Robert L. Boylestad
Publisher: PEARSON
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Textbook Question
Chapter 20, Problem 21P
a. A wattmeter is connected with its current coil as shown in Fig. 20.63 and with the potential coil across points f-g. What does the wattmeter read?
b. Repeat part (a) with the potential coil (PC) across
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1. Each phase of a delta-connected load comprises a resistor of 50 a and capacitor of 50 uF in
series. Calculate (a) the line and phase currents (b) the total power and (c) the kilovoltamperes when the
load is connected to a 440-V, 3-phase, 50-Hz supply.
2. Three similar-coils, A, B and C are available. Each coil has 9Q resistance and 12 Q reactance.
They are connected in delta to a 3-phase, 440-V, 50-Hz supply. Calculate for this load:
(a) the line cuIrent
(c) the total kilovolt-amperes
If the coils are reconnected in star, calculate for the new load the quantities named at (a), (b); (c) and
(d) above.
3. Three similar choke coils are connected in star to a 3-phase supply. If the line currents are 15 A,
the total power consumed is 11 kW and the volt-ampere input is 15 kVA, find the line and phase voltages,
the VAR input and the reactance and resistance of each coil.
[(a) 9.46 A; 5.46 A (b) 4480 W () 7.24 kVA]
(b) the power factor
(d) the total kilowatts
[50.7 A; 0.6; 38.6 kVA; 23.16…
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PREUMINARY INFORMATION:
Electrical compensation is a major scale subject that every business/facility is Included. The power
factor should be compensated to change the reactive power up to some specific values since some
reactive power limits are not good for consumption and generation of the electricity (this is a far
large topic which also forms some subbranches, for more information and specification please
research yourself). For this reason, it is an obligation to use a compensator system for both
manufacturers (wind farms/hydroelectric power plants/etc.) and consumers
(residents/factories/etc.). These issues are regulated by official directives.
EXERCISE STEPS:
A single-phase load has an active power of P = 2 kW at 180 V @60HZ and the power factor is coso =
0.75. This motor is compensated to coso = 0.85 using a parallel capacitor (the load is modelled as
series…
PHASE DIFFERENCE FIND( NEED NEAT HANDWRITTEN SOLUTION ONLY OTHERWISE DOWNVOTE).
Chapter 20 Solutions
Introductory Circuit Analysis (13th Edition)
Ch. 20 - For the battery of bulbs (purely resistive)...Ch. 20 - For the network of Fig. 20.49 : a. Find the...Ch. 20 - For the network of Fig. 20.50 : a. Determine the...Ch. 20 - For the system of Fig. 20.51 : a. Find the total...Ch. 20 - For the system of Fig. 20.52 : a. Find PT, QT. and...Ch. 20 - 6. For the system of Fig. 20.53 : a. Find PT, QT....Ch. 20 - For the network of Fig. 20.54 : a. Find the type...Ch. 20 - For the circuit of Fig. 20.55: a. Find the...Ch. 20 - For the network of Fig. 20.56 : a. Find Is. b....Ch. 20 - Repeat Problem 9 for the network of Fig. 20.57.
Ch. 20 - For the network of Fig. 20.58: a. Find the average...Ch. 20 - An electrical system is rated 10 kVA, 200 V at a...Ch. 20 - An electrical system is rated 5 kVA, 120 V, at a...Ch. 20 - For the system of Fig. 20.59: a. Find the total...Ch. 20 - Repeat Problem 14 for the system of Fig. 20.60.Ch. 20 - For the circuit of Fig. 20.61: Find the total...Ch. 20 - For the circuit of Fig. 20.62: Find the total...Ch. 20 - Prob. 18PCh. 20 - The load on a 120 V, 60 Hz supply is 5 kW...Ch. 20 - The loading of a factory on a 1000 V, 60 Hz system...Ch. 20 - a. A wattmeter is connected with its current coil...Ch. 20 - The voltage source in Fig. 20.64 delivers 660 VA...Ch. 20 - a. An air-core coil is connected to a 200 V, 60 Hz...Ch. 20 - a. The inductance of an air-core coil is 0.08 H....Ch. 20 - Using PSpice or Multisim, obtain a plot of...
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- Q20. A 230 V, 50 Hz AC supply is applied to a coil of 0.16 H inductance and 6.5 Q resistance connected in series with a capacitor. The power consumed by the circuit is 2.61 KW at 0.566 pf lagging. Estimate the following: i. Current flowing through the circuit. i. Phase angle between current and voltage. iii. The value of the capacitor.arrow_forwardA 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 d. Real power supplied by the source e. Reactive power supplied by the source f. Apparent power of the circuit g. Power factor of the entire circuitarrow_forwardQ20. A 230 V, 50 Hz ac supply is applied to a coil of 0.16 H inductance and 6.5 Q resistance connected in series with a capacitor. The power consumed by the circuit is 2.61 KW at 0.566 pf lagging. Estimate the following: i. Current flowing through the circuit. ii. Phase angle between current and voltage. Draw the phasor diagram iii. The value of the capacitorarrow_forward
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