Electronics Fundamentals: Circuits, Devices & Applications
8th Edition
ISBN: 9780135072950
Author: Thomas L. Floyd, David Buchla
Publisher: Prentice Hall
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Textbook Question
Chapter 2, Problem 6TFQ
A rheostat performs the same function as a potentiometer.
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1) Maximum dimension of antenna is 0.5m and operating frequency is 9 GHz, thus the radius of
reactive near field region is
0.562m
1.265m
2.526m
3.265m
2) If distance between transmitter and receiver is 2km and the signal carrier frequency is
300kHz
Rapidly time-varying fields DC field Quasi-static field None
3) The polarization mismatch factor for horizontal polarization wave incident on +z axis is
is if the antenna polarization is circular
0.5
зав
0.707
1
4) Ez 0 and Hz #0 (HE modes): This is the case when neither E nor H field is transverse to the
direction of wave propagation. They are sometimes referred to as
TEM
hybrid modes
TM
TE
5) The normalized radiation intensity of an antenna is represented by:
U(6)=cos²(0) cos2 (30), w/s Half-power beamwidth HPBW is......
28.75
10
0
14.3
Choose the best answer of the following:
1- quasi-static electromagnetic field is the
a) low frequency b)high frequency c) time independent d) none of the above
2- Displacement current is taken to be negligible (compared to the conduction current) if
a) σ>>wε b)σ << wɛ c) σ =0 d) (a and c)
3- The transmission line act as inductor when it terminated by:
a) Open circuit load b) short circuit load c)matched load d)none of the above
4- The scattering aperture equals to the effective aperture when the antenna is:
a) Complex conjugate matching b) short circuit c) open circuit d) none of the above
5- The isotropic point source has directivity of:
a) Infinity b)1 c) 0 d)1.5
I selected a DC-DC converter capable of delivering 120 VDC from a 600 VDC input. When I reached out to the manufacturer, they asked for the total power consumption the converter would need to handle.To estimate this, I calculated the power requirements for the components that will use the 120 VDC supply: interior lighting, end lights, and buzzers. The breakdown is as follows:- Light Bulbs: 16 bulbs at 10 W each = 160 W- Buzzers: 2 buzzers at 5 W each = 10 W- End Lights: 2 lights at 15 W each = 30 W
This results in a total estimated power demand of 200 W.My concern is whether I should request a higher wattage rating for the converter to provide sufficient tolerance and ensure the system operates efficiently without risking an overload.
Note: The DC power system is designed specifically for a trolley
Chapter 2 Solutions
Electronics Fundamentals: Circuits, Devices & Applications
Ch. 2 - The number of neutrons in the nucleus is the...Ch. 2 - The unit of charge is the ampere.Ch. 2 - Energy in a battery is stored in the form of...Ch. 2 - Prob. 4TFQCh. 2 - In a five-band precision resistor, the fourth band...Ch. 2 - A rheostat performs the same function as a...Ch. 2 - A strain gauge changes resistance in response to...Ch. 2 - Prob. 8TFQCh. 2 - Prob. 9TFQCh. 2 - The three basic measurements that can be done by a...
Ch. 2 - A neutral atom with an atomic number of three has...Ch. 2 - Electron orbits are called shells nuclei waves...Ch. 2 - Materials in which current cannot be established...Ch. 2 - When placed close together, a positively charged...Ch. 2 - The charge on a single electron is 6.2510-18C...Ch. 2 - Prob. 6STCh. 2 - Prob. 7STCh. 2 - Prob. 8STCh. 2 - Prob. 9STCh. 2 - Prob. 10STCh. 2 - Prob. 11STCh. 2 - There is no current in a circuit when a series...Ch. 2 - Prob. 13STCh. 2 - Potentiometers and rheostats are types of voltage...Ch. 2 - The current in a given circuit is not to exceed 22...Ch. 2 - How many coulombs of charge do 501031 electrons...Ch. 2 - How many electrons does it take to make 80C of...Ch. 2 - What is the charge in coulombs of the nucleus of a...Ch. 2 - What is the charge in coulombs of the nucleus of a...Ch. 2 - Detemine the voltage in each of the following...Ch. 2 - Five hundred joules of energy are used to move 100...Ch. 2 - What is the voltage of a battery that uses 800 J...Ch. 2 - How much energy does a 12 V battery in your car...Ch. 2 - Assume that a solar battery charger delivers 2.5 J...Ch. 2 - If the solar cell in Problem 9 has moved the...Ch. 2 - Determine the current in each of the following...Ch. 2 - Six-tenths coulomb passes a point in 3 s. What is...Ch. 2 - How long does it take 10 C to flow past a point if...Ch. 2 - How many coulombs pass a point in 0.1 s when the...Ch. 2 - Figure 2-61(a) shows color-coded resistors....Ch. 2 - 16. Find the minimum and the maximum resistance...Ch. 2 - If you need a 270 resistor with 5% tolerance. what...Ch. 2 - Determine the resistance value and tolerance for...Ch. 2 - Determine the resitance and tolerance of each of...Ch. 2 - Determine the color bands for each of the...Ch. 2 - Determine the resistance and tolerance of each of...Ch. 2 - Determine the color bands for each of the...Ch. 2 - Determine the resistance values represented by the...Ch. 2 - The adjustable contact of a linear potentlometer...Ch. 2 - Trace the current path in the lamp circuit of...Ch. 2 - With the switch in either position, redraw the...Ch. 2 - Show the placement of an ammeter and a voltmeter...Ch. 2 - Show how you would measure the resistance of R2 in...Ch. 2 - In Figure 2-64 what does each voltmeter indicate...Ch. 2 - In Figure 2-64, show how to connect an ammeter to...Ch. 2 - What is the voltage reading of the meter in Figure...Ch. 2 - How much resistance is the meter in Figure 2-66...Ch. 2 - Determine the resistance indicated by each of the...Ch. 2 - A multimeter has the following ranges:...Ch. 2 - A resistor with a current of 2 A through it in an...Ch. 2 - If 5741015 electrons flow through a speaker wire...Ch. 2 - A 120 V source is to be connected to a 1500...Ch. 2 - Determine the resistance and tolerance of each...Ch. 2 - Prob. 39PCh. 2 - Through which resistor in Figure 2-70 is there...Ch. 2 - In Figure 2-70, show the proper placement of...Ch. 2 - Show the proper placement of voltmeters to measure...Ch. 2 - Devise a switch arrangement where by two voltage...
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- Choose the best answer 1. The minimum value of the directivity of an antenna is.......... a) Unity b) Zero 2. Very low signal strength in antenna. a) Minor lobes b) Null c) Infinite d) None c) Antenna patterns d) Major lobes 3. the maximum directivity of an antenna that normalized far field pattern is given by? 0≤0≤ and 0 ≤≤π/2,3л/2≤ p ≤ 2π E(0, 4) = {(sin 0 ((sin cos² ) 1/2 0 is a) 7.07dB b) 7.7dB elsewhere c) 8.7dB d) 9dB 4. the depth of penetration of 1 MHz wave in sea water which has conductivity mhos/meter and permeability approximately equal to that of free space is a) 25mm b) 25cm c)25m 5. The free space media can be considered as _ a) Lossy media b) lossless media c) good conductor 6. The input impedance is equal to the load impedance when a) l = 2 b)1=22 c)=4 d) 25km d) a and c .... d) a and barrow_forwardQ.1. choose the appropriate answer 1- When neither E nor H field is transverse to the direction of wave propagation. They are sometimes referred to as ...... a) hybrid mode b) TM mode c) TME modes d) TEM mode 2- If PLF-0 dB means......... a) Power is lost 100% b) Power is lost 0% c) Power is lost 50% d) none of the above 3. The half wave dipole is widely used in more applications compared to other linear antenna lengths, that is because..... a) It has high gain b) its easy matching to coaxial 75 Ohm cable c) low loss d) it has small size 4- The mode distribution for the end view waveguide shown below is a) TM12 b) TM21 c) TE20 end view d) TE02 5. When circular right hand polarized wave incident upon a horizontally polarized wave the PLF is a) 0 b)1 c)0.5 d)0.707arrow_forwarda- Single phase transmission line as in the figure below with the radius of the conductor is 0.5 cm, find the inductance of the total system. 4m 4m ao A B ob od 3m 6marrow_forward
- Please don't use ai to answer I will report you answerarrow_forwardA 3-phase, 4-wire distributor supplies a balanced voltage of 400/230 V to a load consisting of 8 A at p.f. 0-7 lagging for R-phase, 10 A at p.f. 0-8 leading for Y phase and 12 A at unity p.f. for B phase. The resistance of each line conductor is 0.4 2. The reactance of neutral is 0.2 2. Calculate the neutral current, the supply voltage for R phase and draw the phasor diagram. The phase sequence is RYB. IN ER VR Refarrow_forwardA 3-phase, 4-wire distributor supplies a balanced voltage of 400/230 V to a load consisting of 50 A at p.f. 0-866 lagging for R-phase, 30 A at p.f. 0-866 leading for Y phase and 30 A at unity pf. for B phase. The resistance of each line conductor is 0-2 Q. The area of X-section of neutral is half of any line conductor: Calculate the supply end voltage for R phase. The phase sequence is RYB.arrow_forward
- - A 3-phase, 4-wire distributor supplies a balanced voltage of 400/230 V to a load consisting of 8 A at p.f. 0.7 lagging for R-phase, 10 A at p.f. 0-8 leading for Y phase and 12 A at unity p.f. for B phase. The resistance of each line conductor is 0.4 2. The reactance of neutral is 0.2 2. Calculate the neutral current, the supply voltage for R phase and draw the phasor diagram. The phase sequence is RYB.arrow_forwardNo AI WILL REJECTarrow_forwardhelp on this one?arrow_forward
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