Basic Engineering Circuit Analysis 11th. Edition by Irwin, J. David; Nelms, R. Mark | 9781119033509 | 1119033500 | Holooly

Basic Engineering Circuit Analysis [EXP-40824]

240 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

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,

Verified Answer:

From the data we find that

S _{1}=24,000+j ...

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,

Verified Answer:

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

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: 12.23

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: 9.11

A load operates at 20 kW, 0.8 pf lagging. The load voltage is 220 /0° V rms at 60 Hz. The impedance of the line is 0.09 + j0.3 Ω. We wish to determine the voltage and power factor at the input to the line.

Verified Answer:

The circuit diagram for this problem is shown in F...

Question: 9.20

A patient in a medical laboratory has a muscle stimulator attached to her left forearm. Her heart rate is being monitored by an EKG machine with two differential electrodes over the heart and the ground electrode attached to her right ankle. This activity is illustrated in Fig. 9.30a.

Verified Answer:

When the passive electrode of the stimulator is co...

Question: 2.21

A standard dc current-limiting power supply shown in Fig. 2.29a provides 0–18 V at 3 A to a load. The voltage drop, VR , across a resistor, R, is used as a current-sensing device, fed back to the power supply and used to limit the current I. That is, if the load is adjusted so that the current

Verified Answer:

Using Ohm’s law, the value of R should be

...

Question: 12.19

A telephone transmission system suffers from 60-Hz interference caused by nearby power utility lines. Let us use the network in Fig. 12.45 to design a simple notch filter to eliminate the 60-Hz interference.

Verified Answer:

The resistor

R_{ eq }

represents th...

Question: 11.5

A three-phase balanced wye–delta system has a line voltage of 208 V rms. The total real power absorbed by the load is 1200 W. If the power factor angle of the load is 20° lagging, we wish to determine the magnitude of the line current and the value of the load impedance per phase in the delta.

Verified Answer:

The line current can be obtained from Eq. (11.26) ...

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