
At ω = 103 rad/s, find the input admittance of each of the circuits in Fig. 9.74.
Figure 9.74
(a)

Find the value of input admittance
Answer to Problem 67P
The value of input admittance
Explanation of Solution
Given data:
Refer to Figure 9.74(a) in the textbook.
The value of angular frequency
Formula used:
Write a general expression to calculate the impedance of a resistor.
Here,
Write a general expression to calculate the impedance of an inductor.
Here,
Write a general expression to calculate the impedance of a capacitor.
Here,
Write a general expression to calculate the input admittance.
Here,
Calculation:
The given circuit is redrawn as shown in Figure 1.
Use equation (1) to find
Use equation (1) to find
Substitute
Substitute
The impedance diagram of Figure 1 is drawn as shown in Figure 2.
Refer to Figure 2, the impedance
The input impedance
Substitute
Conclusion:
Thus, the value of input admittance
(b)

Find the value of input admittance
Answer to Problem 67P
The value of input admittance
Explanation of Solution
Calculation:
The given circuit is also redrawn as shown in Figure 3.
Use equation (1) to find
Use equation (1) to find
Use equation (1) to find
Substitute
Substitute
The impedance diagram of Figure 3 is drawn as shown in Figure 4.
Refer to Figure 4, the impedances
The equivalent impedance
Now, the Figure 4 is reduced as shown in Figure 5.
Refer to Figure 5, the impedance
The input impedance
Substitute
Conclusion:
Thus, the value of input admittance
Want to see more full solutions like this?
Chapter 9 Solutions
Fundamentals of Electric Circuits
Additional Engineering Textbook Solutions
Automotive Technology: Principles, Diagnosis, And Service (6th Edition) (halderman Automotive Series)
Elementary Surveying: An Introduction To Geomatics (15th Edition)
Mechanics of Materials (10th Edition)
Starting Out with Java: From Control Structures through Objects (7th Edition) (What's New in Computer Science)
BASIC BIOMECHANICS
Database Concepts (8th Edition)
- The efficiency of a motor is always low when it operates at 10 percent of its nominal power rating. Explain.arrow_forwardA dc motor connected to a 240 V line pro- duces a mechanical output of 160 hp. Knowing that the losses are 12 kW, calculate the input power and the line current.arrow_forwardA 115 V dc generator delivers 120 A to a load. If the generator has an efficiency of 81 percent, calculate the mechanical power needed to drive it [hp].arrow_forward
- A machine having class B insulation attains a temperature of 208°C (by resistance) in a torrid ambient temperature of 180°C. a. What is the temperature rise? b. Is the machine running too hot and, if so, by how much?arrow_forward1 Name the losses in a dc motor. 2 What causes iron losses and how can they be reduced? -3 Explain why the temperature of a machine increases as the load increases.arrow_forward20. A tractor weighing 14 kN with a wheel base of 3m carries an 8 kN load on its rear wheel. Compute the maximum bending moment and shear when crossing a 4.5 span. Consider the load only at the wheels.arrow_forward
- A 110-V, three-phase, Y-connected, 8 pole, 48-slot, 6000-rpm, double-layer wound chronoun anı vonorotor boo 10 +1 urn or oilarrow_forward-7 Name some of the factors that contribute to the deterioration of organic insulators. -8 A motor is built with class H insulation. What maximum hot-spot temperature can it withstand?arrow_forwardCalculate the full-load current of a 250 hp, 230 V dc motor having an efficiency of 92 percent.arrow_forward
- Assignment #2 A 110-V, three-phase, Y-connected, 8 pole, 48-slot, 6000-rpm, double-layer wound, synchronous generator has 12 turns per coil. If one side of the coil is in slot 1, the other side is in slot 6. There are 4 parallel paths. When the generator delivers the rated load at a line voltage of 110 V, the voltage regulation is 5%. What is the flux per pole? Draw two consecutive phasegroups of one of the phase windings and connect them (a) in series and (b) in parallel showing the Start (S) and Finish (F) of both connections. (A separate drawing for each connection)arrow_forward3-4 Transmissiva Live of 120km has R= 0.2 ~2/15 X= 0.8 -2/km Y = 15H/6 5/km The line is supplies a load of 45 kV, SOMW, 0.8 lead p.f find sending voltage, Sending Current p.f. Sanding Voltage Regulation ⑨Voltage 5 Ⓒ charching coming! изу usy π cct लेarrow_forwardA (medium) single phase transmission line 100 km long has the following constants : Resistance/km = 0.25 Q; Susceptance/km = 14 × 10° siemen ; Reactance/km = 0.8 Receiving end line voltage = 66,000 V Assuming that the total capacitance of the line is localised at the receiving end alone, determine (i) the sending end current (ii) the sending end voltage (iii) regulation and (iv) supply power factor. The line is delivering 15,000 kW at 0.8 power factor Lead Draw the phasor diagram to illustrate your calculations.arrow_forward
- Delmar's Standard Textbook Of ElectricityElectrical EngineeringISBN:9781337900348Author:Stephen L. HermanPublisher:Cengage LearningElectricity for Refrigeration, Heating, and Air C...Mechanical EngineeringISBN:9781337399128Author:Russell E. SmithPublisher:Cengage Learning

