Electric Circuits 10th. Edition by James W. Nilsson, Susan Riedel | 9780133760033 | 0133760030 | Holooly

Electric Circuits [EXP-19836]

152 SOLVED PROBLEMS

Question: 9.6

A 90 Ω resistor, a 32 mH inductor, and a 5μF capacitor are connected in series across the terminals of a sinusoidal voltage source, as shown in Fig. 9.15. The steady-state expression for the source voltage v_{s}is 750 cos (5000t + 30^°) V. a) Construct the frequency-domain equivalent circuit. b) Ca

Verified Answer:

a) From the expression for

v_{s}

, ...

Question: 11.5

A balanced three-phase load requires 480 kW at a lagging power factor of 0.8. The load is fed from a line having an impedance of 0.005 + j0.025 Ω/Φ . The line voltage at the terminals of the load is 600 V. a) Construct a single-phase equivalent circuit of the system. b) Calculate the magnitude of

Verified Answer:

a) Figure 11.17 shows the single-phase equivalent ...

Question: 11.1

A balanced three-phase Y-connected generator with positive sequence has an impedance of 0.2 + j0.5Ω/Φ and an internal voltage of 120 V/Φ .The generator feeds a balanced three-phase Y-connected load having an impedance of 39 + j28 Ω/Φ .The impedance of the line connecting the generator to the load

Verified Answer:

a) Figure 11.10 shows the single-phase equivalent ...

Question: 14.5

A graphic equalizer is an audio amplifier that allows you to select different levels of amplification within different frequency regions. Using the series RLC circuit in Fig.14.19(a),choose values for R, L, and C that yield a bandpass circuit able to select inputs within the 1–10 kHz frequency band

Verified Answer:

We need to compute values for

R

,[l...

Question: 10.10

A load impedance having a constant phase angle of -36.87°is connected across the load terminals a and b in the circuit shown in Fig. 10.23. The magnitude of ZL is varied until the average power delivered is the most possible under the given restriction. a) Specify ZL in rectangular form. b) Calculat

Verified Answer:

a) From Eq. 10.50, we know that the magnitude of [...

Question: 9.1

A sinusoidal current has a maximum amplitude of 20 A. The current passes through one complete cycle in 1 ms .The magnitude of the current at zero time is 10 A. a) What is the frequency of the current in hertz? b) What is the frequency in radians per second? c) Write the expression for i(t) using th

Verified Answer:

a) From the statement of the problem, T = 1 ms; he...

Question: 9.2

A sinusoidal voltage is given by the expression v = 300 cos(120π t + 30^°). a) What is the period of the voltage in milliseconds? b) What is the frequency in hertz? c) What is the magnitude of v at t = 2.778 ms? d) What is the rms value of v ?

Verified Answer:

a) From the expression for

v ,\omega=120 \p...

Question: 3.5

a) A 50 mV, 1 mA d’ Arsonval movement is to be used in an ammeter with a full-scale reading of 10 mA. Determine RA. b)Repeat (a) for a full-scale reading of 1 A. c) How much resistance is added to the circuit when the 10 mA ammeter is inserted to measure current? d) Repeat (c) for the 1 A ammeter

Verified Answer:

a) From the statement of the problem, we know that...

Question: 3.6

a) A 50 mV, 1 mA d’Arsonval movement is to be used in a voltmeter in which the full-scale reading is 150 V. Determine Rv b) Repeat (a) for a full-scale reading of 5 V. c) How much resistance does the 150 V meter insert into the circuit? d) Repeat (c) for the 5 V meter.

Verified Answer:

a) Full-scale deflection requires 50 mV across the...

Question: 10.3

a) A sinusoidal voltage having a maximum amplitude of 625 V is applied to the terminals of a 50 Ω resistor. Find the average power delivered to the resistor. b) Repeat (a) by first finding the current in the resistor.

Verified Answer:

a) The rms value of the sinusoidal voltage is [lat...

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