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 16, Problem 47P
Open file P16-47 and determine if there is a fault. If so, identify it.
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with steps."
Find Laplace transform and the corresponding ROC for
x(t) = e−3sin(2t) u(t)dt
Three similar coils, connected in star, take a total
power of 1.5 kW, at a power factor of 0.2, from a
three-phase, 400 V, 50 Hz supply. Calculate: (a) the
resistance and inductance of each coil; (b) the line
currents if one of the coils is short-circuited.
(a) Three 20 µF capacitors are star-connected across
a 400 V, 50 Hz, three-phase, three-wire supply.
Calculate the current in each line. (b) If one of the
capacitors is short-circuited, calculate the line cur
rents. (c) If one of the capacitors is open-circuited,
calculate: the line currents and the p.d. across each
of the other two capacitors.
ANS:
1.525 A; 2.64 A, 2.64 A, 4.57 A; 1.32 A, 1.32 A, 0;
210 V
Chapter 16 Solutions
Electronics Fundamentals: Circuits, Devices & Applications
Ch. 16 - Silicon can be doped with a trivalent material...Ch. 16 - The minority carriers in an n-type material are...Ch. 16 - Before a diode fully conducts, the bias must...Ch. 16 - When forward bias is applied to a diode, the...Ch. 16 - The output frequency from a full-wave rectifier is...Ch. 16 - The peak output voltage of a full-wave bridge...Ch. 16 - If one diode is open in a bridge rectifier, the...Ch. 16 - Line regulation specifies how much change occurs...Ch. 16 - Normally, zener diodes, varactor diodes, and...Ch. 16 - Prob. 10TFQ
Ch. 16 - Â Atoms within a semiconductor crystal arc held...Ch. 16 - Free electrons exist in the valence band...Ch. 16 - Prob. 3STCh. 16 - The process of adding impurity atoms to a pure...Ch. 16 - Prob. 5STCh. 16 - The majority carriers in an n-type semiconductor...Ch. 16 - The pn junction is found in diodes silicon all...Ch. 16 - Prob. 8STCh. 16 - A fixed dc voltage that sets the operating...Ch. 16 - Prob. 10STCh. 16 - When a diode is forward-biased, it is blocking...Ch. 16 - Prob. 12STCh. 16 - The process of converting ac to pulsating dc is...Ch. 16 - Prob. 14STCh. 16 - The number of diodes used in a half-wave rectifier...Ch. 16 - If a 75 V peak sine wave is applied to a half-wave...Ch. 16 - The output frequency of a full-wave rectifier with...Ch. 16 - Two types of full-wave rectifier are single diode...Ch. 16 - When a diode in a center-tapped rectifier opens,...Ch. 16 - During the positive half-cycle of the input...Ch. 16 - The process of changing a half-wave or a full-wave...Ch. 16 - Prob. 22STCh. 16 - The zener diode is designed to operate in zener...Ch. 16 - Zener diodes are sometimes used as current...Ch. 16 - Varactor diodes are used as variable resistors...Ch. 16 - Prob. 26STCh. 16 - In a photodiode, light produces reverse current...Ch. 16 - List two semiconductive materials.Ch. 16 - How many valence electrons do semiconductors have?Ch. 16 - In a silicon crystal, how many covalent bonds does...Ch. 16 - What happens when heat is added to silicon?Ch. 16 - Name the two energy levels at which current is...Ch. 16 - Describe the process of doping and explain how it...Ch. 16 - What type of impurity is antimony? What type of...Ch. 16 - Explain what a hole is.Ch. 16 - What is recombination?Ch. 16 - How is the electric field across the pn junction...Ch. 16 - Because of its barrier potential, can a diode be...Ch. 16 - To forward-bias a diode, to which region must the...Ch. 16 - Prob. 13PCh. 16 - Explain how to generate the forward-bias portion...Ch. 16 - What would cause the barrier potential to decrease...Ch. 16 - Determine whether each diode in Figure 16-74 is...Ch. 16 - Determine the voltage across each diode in Figure...Ch. 16 - Examine the meter indications in each circuit of...Ch. 16 - Determine the voltage with respect to ground at...Ch. 16 - Calculate the average value of a half-wave...Ch. 16 - Prob. 21PCh. 16 - Can a diode with a PIV rating of 50 V be used in...Ch. 16 - Prob. 23PCh. 16 - Calculate the average value of a full-wave...Ch. 16 - Consider the circuit in Figure 16-79. What type of...Ch. 16 - Calculate the peak voltage rating of each half of...Ch. 16 - Prob. 27PCh. 16 - Prob. 28PCh. 16 - The ideal dc output voltage of a capacitor-input...Ch. 16 - Refer to Figure 16-80 and draw the waveforms VA...Ch. 16 - A certain voltage regulator has a no-load output...Ch. 16 - Prob. 32PCh. 16 - Prob. 33PCh. 16 - The VZ of a given zener diode changes 38 mV for a...Ch. 16 - Figure 16-81 is a curve of reverse voltage versus...Ch. 16 - Refer to Figure 16-81 and determine the value of...Ch. 16 - When the switch in Figure 16-82 is closed, will...Ch. 16 - Prob. 38PCh. 16 - From the meter readings in Figure 16-83, determine...Ch. 16 - Each part of Figure 16-84 shows oscilloscope...Ch. 16 - For each set of measured voltages at nodes 1 and 2...Ch. 16 - Determine the most likely failure in the circuit...Ch. 16 - Prob. 43PCh. 16 - Prob. 44PCh. 16 - Prob. 45PCh. 16 - Prob. 46PCh. 16 - Open file P16-47 and determine if there is a...Ch. 16 - Open file P16-48 and determine if there is a...Ch. 16 - Open file P16-49 and determine if there is a...Ch. 16 - Open file P16-50 and determine if there is a...Ch. 16 - Prob. 51PCh. 16 - Open file P16-52 and determine if there is a...
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- Explain the advantages of three-phase supply for distribution purposes. (b) Assuming the relationship between the line and phase values of currents and voltages, show that the active power input to a three-phase balanced load is √3VI cos φ, where V and I are line quantities. (c) Three similar inductors, each of resistance 10 Ω and inductance 0.019 H, are delta-connected to a three-phase, 400 V, 50 Hz sinusoidal supply. Calcu late: the value of the line current; the power factor and the active power input to the circuit. ANS: 59.5 A, 0.858 lag, 35.5 kWarrow_forwardnot use ai pleasearrow_forwardA three-phase, 400 V, star-connected motor has an output of 50 kW, with an efficiency of 90 per cent and a power factor of 0.85. Calculate the line current. Sketch a phasor diagram showing the voltages and currents. If the motor windings were connected in mesh, what would be the correct voltage of a three phase supply suitable for the motor? ANS: 90.8 A, 240 Varrow_forward
- Don't use ai to answer I will report you answerarrow_forwardShow with the aid of a phasor diagram that for both star- and delta-connected balanced loads, the total active power is given by √3VI cos φ, where V and I are the line values of voltage and current respectively and φ is the angle between phase values of voltage and current. A balanced three-phase load consists of three coils, each of resistance 4 Ω and inductance 0.02 H. Determine the total active power when the coils are (a) star-connected, (b) delta-connected to a 400 V, three phase, 50 Hz supply. ANS:11.56 kW, 34.7 kWarrow_forwardThe load connected to a three-phase supply comprises three similar coils connected in star. The line currents are 25 A and the apparent and active power inputs are 20 kVA and 11 kW respectively. Find the line and phase voltages, reactive power input and the resistance and reactance of each coil. If the coils are now con nected in delta to the same three-phase supply, calculate the line currents and the active power taken. ANS : 462 V, 267 V, 16.7 kvar, 5.87 Ω, 8.92 Ω; 75 A, 33 kWarrow_forward
- A three-phase delta-connected load, each phase of which has an inductive reactance of 40 Ω and a resistance of 25 Ω, is fed from the secondary of a three-phase star-connected transformer which has a phase voltage of 230 V. Draw the circuit diagram of the system and calculate: (a) the current in each phase of the load; (b) the p.d. across each phase of the load; (c) the current in the transformer secondary windings; the total active power taken from the supply and its power factor.arrow_forwardDerive the numerical relationship between the line and phase currents for a balanced three-phase delta connected load. Three coils are connected in delta to a three-phase, three-wire, 400 V, 50 Hz supply and take a line current of 5 A 0.8 power factor lagging. Calculate the resistance and inductance of the coils. If the coils are star-connected to the same supply, calculate the line current and the total power. Calculate the line cur rents if one coil becomes open-circuited when the coils are connected in star. Ans: 110.7 Ω, 0.264 H; 1.67 A, 926 W; 1.445 A, 1.445 A, 0arrow_forwardDerive, for both star- and delta-connected systems, an expression for the total power input for a balanced three-phase load in terms of line voltage, line current and power factor. The star-connected secondary of a transformer supplies a delta-connected motor taking a power of 90 kW at a lagging power factor of 0.9. If the volt age between lines is 600 V, calculate the current in the transformer winding and in the motor winding. Draw circuit and phasor diagrams, properly labelled, showing all voltages and currents in the transformer secondary and the motor. ANS: . 96.2 A, 55.6 Aarrow_forward
- Deduce the relationship between the phase and the line voltages of a three-phase star-connected generator. If the phase voltage of a three-phase star-connected generator is 200 V, what will be the line voltages: (a) when the phases are correctly connected; (b) when the connections to one of the phases are reversed? ans: 346 V; 346 V, 200 V, 200 Varrow_forwardQ2: Given a discrete sequence x(n) = [1,-1,2,4, 1, 3,-1,1] and its spectrum X(k): i. Show that: X(k) =G(k)+WH(k) k=0,1,2,3,4,5,6,7 where G(k) = DFT[g(n)] and H(k) = DFT[h(n)], g(n) and h(n) are even and odd components of x(n) respectively. ii. Compute G(k) and H(k) using the method of computation of DFTS of two real sequences. (15 marks)arrow_forwardQ2: Given a discrete sequence x(n) = [1,-1,2,4, 1, 3,-1,1] and its spectrum X(k): i. Show that: X(k) = G(k)+WH(k) k = 0,1,2,3,4,5,6,7 where G(k) = DFT[g(n)] and H(k) = DFT[h(n)], g(n) and h(n) are even and odd components of x(n) respectively. ii. Compute G(k) and H(k) using the method of computation of DFTS of two real sequences.arrow_forward
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