Basic Engineering Circuit Analysis 9th. Edition by J. David Irwin, R. Mark Nelms | 9780470128695 | 47012869 | Holooly

Basic Engineering Circuit Analysis [EXP-40574]

329 SOLVED PROBLEMS

Question: 11.4

A balanced delta-connected load contains a 10-Ω resistor in series with a 20-mH inductor in each phase. The voltage source is an abc-sequence three-phase 60-Hz, balanced wye with a voltage Van = 120 ∠30°V rms. We wish to determine all Δ currents and line currents.

Verified Answer:

The impedance per phase in the delta load is [late...

Question: 11.7

A balanced three-phase source serves three loads as follows: Load 1: 24 kW at 0.6 lagging power factor Load 2: 10 kW at unity power factor Load 3: 12 kVA at 0.8 leading power factor If the line voltage at the loads is 208 V rms at 60 Hz, we wish to determine the line current and the combined power

Verified Answer:

From the data we find that

\begin{al...

Question: 9.21

A cardiac care patient with a pacing electrode has ignored the hospital rules and is listening to a cheap stereo. The stereo has an amplified 60-Hz hum that is very annoying. The patient decides to dismantle the stereo partially in an attempt to eliminate the hum. In the process, while he is

Verified Answer:

Let us suppose that the patient's skin is damp and...

Question: 3.22

A conceptual circuit for manually setting the speed of a dc electric motor is shown in Fig. 3.31a. The resistors R1 and R2 are inside a component called a potentiometer, or pot, which is nothing more than an adjustable resistor, for example, a volume control. Turning the knob changes the ratio

Verified Answer:

Since the power amplifier output voltage is propor...

Question: 2.16

A dc transmission facility is modeled by the approximate circuit shown in Fig. 2.21. If the load voltage is known to be Vload = 458.3 kV, we wish to find the voltage at the sending end of the line and the power loss in the line.

Verified Answer:

Knowing the load voltage and load resistance, we c...

Question: 7.22

A defibrillator is a device that is used to stop heart fibrillations-erratic uncoordinated quivering of the heart muscle fibers-by delivering an electric shock to the heart. The Lown defibrillator was developed by Dr. Bernard Lown in 1962. Its key feature, shown in Fig. 7.69a, is its voltage

Verified Answer:

Since the Lown waveform is oscillatory in nature, ...

Question: 12.40

A fast growing field within electrical engineering is mixed-mode circuitry, which combines digital and analog networks to create a larger system. A key component in these systems is the analog-to-digital converter, or ADC. It “measures” an analog voltage and converts it to a digital representation.

Verified Answer:

Assuming the ADC has infinite input resistance, we...

Question: 7.15

A heart pacemaker circuit is shown in Fig. 7.46. The SCR (silicon-controlled rectifier) is a solid-state device that has two distinct modes of operation. When the voltage across the SCR is increasing but less than 5 V, the SCR behaves like an open circuit, as shown in Fig. 7.47a. Once the voltage

Verified Answer:

For t < 1 s, the equivalent circuit for the pac...

Question: 12.23

A high-pass filter network is shown in Fig. 12.53 together with the op-amp subcircuit. We wish to plot the frequency response of the filter over the range from 1 to 100 kHz.

Verified Answer:

The frequency-response plot for this high-pass fil...

Question: 9.27

A light-duty commercial single-phase three-wire 60 -Hz circuit serves lighting, heating, and motor loads, as shown in Fig. 9.38a. Lighting and heating loads are essentially pure resistance and, hence, unity power factor (pf), whereas motor loads have lagging pf.

Verified Answer:

a. The magnitudes of the rms currents are [...

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