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 21, Problem 3P
Determine the output voltage of the op-amp in Figure 21-45 if the thermocouple is measuring a temperature of
Refer to Table 21-1.
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Students have asked these similar questions
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
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 kW
Chapter 21 Solutions
Electronics Fundamentals: Circuits, Devices & Applications
Ch. 21 - A thermocouple can measure higher temperatures...Ch. 21 - Thermocouples are commonly used to measure body...Ch. 21 - An advantage of an RTD over a thermistor is that...Ch. 21 - Prob. 4TFQCh. 21 - A thermocouple signal conditioner must have high...Ch. 21 - Signal conditioning for temperature sensors...Ch. 21 - Prob. 7TFQCh. 21 - Absolute pressure is measured relative to the...Ch. 21 - In a sample-and-hold circuit, an analog value is...Ch. 21 - Prob. 10TFQ
Ch. 21 - A thermocouple a change in resistance for a change...Ch. 21 - In a thermocouple circuit, where each of the...Ch. 21 - A thermocouple signal conditioner is designed to...Ch. 21 - Prob. 4STCh. 21 - Prob. 5STCh. 21 - Prob. 6STCh. 21 - Prob. 7STCh. 21 - Prob. 8STCh. 21 - Prob. 9STCh. 21 - Prob. 10STCh. 21 - Prob. 11STCh. 21 - Prob. 12STCh. 21 - Prob. 13STCh. 21 - Prob. 14STCh. 21 - In an analog switch, the aperture time is the time...Ch. 21 - Prob. 16STCh. 21 - An analog signal must be sampled at a minimum rate...Ch. 21 - Prob. 18STCh. 21 - Prob. 19STCh. 21 - Prob. 20STCh. 21 - Prob. 21STCh. 21 - Three identical thermocouples are each exposed to...Ch. 21 - You have two thermocouples. One is a K type and...Ch. 21 - Determine the output voltage of the op-amp in...Ch. 21 - What should be the output voltage in Problem 3 if...Ch. 21 - Prob. 5PCh. 21 - Prob. 6PCh. 21 - Explain the difference in the results of Problems...Ch. 21 - Prob. 8PCh. 21 - A certain material being measured undergoes a...Ch. 21 - Explain how a strain gauge can be used to measure...Ch. 21 - Identify and compare the three symbols in Figure...Ch. 21 - Determine the output voltage waveform for the...Ch. 21 - Repeat Problem 12 for the waveforms in Figure...Ch. 21 - Name two ways an SCR can be placed in the...Ch. 21 - Sketch the VR waveform for the circuit in Figure...Ch. 21 - For the circuit in Figure 21-53, describe the...Ch. 21 - What change to the circuit in Figure 21-53 would...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Similar questions
- not 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_forwardDon't use ai to answer I will report you answerarrow_forward
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- Derive 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_forwardDeduce 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_forward
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