Loose Leaf for Engineering Circuit Analysis Format: Loose-leaf
9th Edition
ISBN: 9781259989452
Author: Hayt
Publisher: Mcgraw Hill Publishers
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Chapter 11, Problem 23E
To determine
Find the value of load resistance to transfer the maximum power to antenna.
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Problem 11.34. At full load, a commercially available 106 hp, three-phase induction motor operates at an efficiency of 96% and a power factor of 0.87 lag. The motor is supplied from a three-phase outlet with a line-voltage rating of 208 V.
1. What is the magnitude of the line current in Ampere drawn from the 208 V outlet? (1 hp = 746 W).
2. Calculate the reactive power in kVAR supplied to the motor.
A 3-phase, 50 Hz, 3000 V motor develops 600 H.P. (447·6 kW), the power factor being 0·75 lagging and the efficiency 0·93. A bank of capacitors is connected in delta across the supply terminals and power factor raised to 0·9 lagging. Each of the capacitance units is built of five similar 600-V capacitors. Determine the leading Kvar taken by each three sets.
A 550-V feeder line supplies an industrial plant consisting of a motor drawing 60 kW at 0.75
pf (inductive), a capacitor with a rating of 20 kVAR, and lighting drawing 10 kW.
(a) Calculate the total reactive power and apparent power absorbed by the plant.
(b) Determine the overall pf.
(c) Find the current in the feeder line.
Chapter 11 Solutions
Loose Leaf for Engineering Circuit Analysis Format: Loose-leaf
Ch. 11.1 - A current source of 12 cos 2000t A, a 200 ....Ch. 11.2 - Given the phasor voltage across an impedance ,...Ch. 11.2 - Prob. 3PCh. 11.2 - Prob. 4PCh. 11.2 - A voltage source vs is connected across a 4...Ch. 11.3 - If the 30 mH inductor of Example 11.7 is replaced...Ch. 11.4 - Calculate the effective value of each of the...Ch. 11.5 - For the circuit of Fig. 11.16, determine the power...Ch. 11.6 - Prob. 10PCh. 11 - Prob. 1E
Ch. 11 - Determine the power absorbed at t = 1.5 ms by each...Ch. 11 - Calculate the power absorbed at t = 0, t = 0+, and...Ch. 11 - Three elements are connected in parallel: a 1 k...Ch. 11 - Let is = 4u(t) A in the circuit of Fig. 11.28. (a)...Ch. 11 - Prob. 6ECh. 11 - Assuming no transients are present, calculate the...Ch. 11 - Prob. 8ECh. 11 - Prob. 9ECh. 11 - Prob. 10ECh. 11 - The phasor current I=915mA (corresponding to a...Ch. 11 - A phasor voltage V=10045V (the sinusoid operates...Ch. 11 - Prob. 13ECh. 11 - Prob. 14ECh. 11 - Find the average power for each element in the...Ch. 11 - (a) Calculate the average power absorbed by each...Ch. 11 - Prob. 17ECh. 11 - Prob. 18ECh. 11 - Prob. 19ECh. 11 - The circuit in Fig. 11.36 has a series resistance...Ch. 11 - Prob. 21ECh. 11 - Prob. 22ECh. 11 - Prob. 23ECh. 11 - Prob. 24ECh. 11 - Prob. 25ECh. 11 - Prob. 26ECh. 11 - Prob. 27ECh. 11 - Prob. 28ECh. 11 - Prob. 29ECh. 11 - Prob. 30ECh. 11 - Prob. 31ECh. 11 - Prob. 32ECh. 11 - Prob. 33ECh. 11 - (a) Calculate both the average and rms values of...Ch. 11 - Prob. 35ECh. 11 - FIGURE 11.43 Calculate the power factor of the...Ch. 11 - Prob. 37ECh. 11 - Prob. 38ECh. 11 - Prob. 40ECh. 11 - Prob. 41ECh. 11 - Prob. 42ECh. 11 - Prob. 43ECh. 11 - Compute the complex power S (in polar form) drawn...Ch. 11 - Calculate the apparent power, power factor, and...Ch. 11 - Prob. 46ECh. 11 - Prob. 48ECh. 11 - Prob. 49ECh. 11 - Prob. 50ECh. 11 - Prob. 51ECh. 11 - Prob. 52ECh. 11 - FIGURE 11.49 Instead of including a capacitor as...Ch. 11 - Prob. 54ECh. 11 - A load is drawing 10 A rms when connected to a...Ch. 11 - For the circuit of Fig. 11.50, assume the source...Ch. 11 - Prob. 57ECh. 11 - A source 45 sin 32t V is connected in series with...Ch. 11 - Prob. 60ECh. 11 - FIGURE 11.51 The circuit in Fig. 11.51 uses a Pi...Ch. 11 - Prob. 62ECh. 11 - Prob. 63ECh. 11 - You would like to maximize power transfer to a 50 ...
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- A 600 V, three-phase synchronous motor supplies the mechanical output of 8.57 kW at 0.9 pf lagging/. The RMS resistance is at 0.5 ohms. If SPL is at 1300W, calculate the efficiency and express it at 2 decimal places. Blank 1 %arrow_forwardA series generator delivers a power of 6.25kW and a load resistance of25Ω. If RA=0.05Ω and RS=0.025Ω, calculate the generated emf.arrow_forwardAn industrial plant consists of several induction motors. The plant absorbs 300 kW at 0.6 PF lagging from the substation bus. Compute the required kVAR rating of the capacitor connected across the load toraise the power factor to 0.9 lagging. A 200-hp, 90% efficiency, synchronous motor is operated from the same busat rated conditions and 0.8 power factor leading. Calculate the resulting powerfactor.arrow_forward
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- : A single phase motor operating off a 400V, 50Hz supply is developing 10KW with an efficiency of 84% and a power factor (p.f) of 0.7 lagging. Calculate; The input apparent power; The active and reactive components of the current; The reactive power (in kilovars).arrow_forwardAn electrical load of 250Kva has a pf of 0.65 inductive. Connects to the same network a 75kW star synchronous motor, with 88% efficiency, to raise the pf of the installation at 0.85 inductive.a) Calculate the apparent pf of the synchronous motor and the pf at which it will work.b) If the supply voltage is 380V, and the motor has a synchronous impedanceof j0.5 ohms per phase determine the induced emf of the machine.arrow_forwardAn e.m.f. whose instantaneous value at time t is given by v(t) = 283 sin (314t + π/4) volts is applied to an inductive circuit and the current in the circuit is i(t) = 5.66 sin (314t - π/6) amperes. Determine: (iii) the active power absorbed (in W)the answer is not 207.286arrow_forward
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