Electric Machinery and Power System Fundamentals
1st Edition
ISBN: 9780072291353
Author: Stephen J. Chapman, Stepehn J. Chapman
Publisher: McGraw-Hill Companies, The
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Textbook Question
Chapter 2, Problem 2.19Q
What is a current transformer? How is it used?
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For the circuit shown in Figure (1). Solve the following: (
A. What type of logic does it represent?
C. Explain the function of D1.
B. What type of logic family does it belong to?
D. Explain the importance of DL.
E. How many stages it has? Explain the function of each one.
F. Construct the truth table and explain it briefly.
G.How can you convert this circuit to an open collector form? Explain and sketch it.
H.How can you convert this circuit to a tri-state form? Explain and sketch it.
I. How can you prevent the transistors from being saturated?
J. Which transistor should be modified to convert this circuit to a 4-inputs NAND?
Explain and sketch it.
K.Convert this circuit to a 2-inputs NOR gate and draw it.
R-1200
R-4.2K
R-1.5K
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Figure (1)
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E. How many stages it has? Explain the function of each one.
F. Construct the truth table and explain it briefly.
G.How can you convert this circuit to an open collector form? Explain and sketch it.
H.How can you convert this circuit to a tri-state form? Explain and sketch it.
I. How can you prevent the transistors from being saturated?
J. Which transistor should be modified to convert this circuit to a 4-inputs NAND?
Explain and sketch it.
K.Convert this circuit to a 2-inputs NOR gate and draw it.
R-4.2K
W
R-1200
R-1.5K
R-IK
Figure (1)
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Chapter 2 Solutions
Electric Machinery and Power System Fundamentals
Ch. 2 - Is the turns ratio of a transformer the same as...Ch. 2 - Why does the magnetization current impose an upper...Ch. 2 - What components compose the excitation current of...Ch. 2 - What is the leakage flux in a transformer? Why is...Ch. 2 - List and describe the types of losses that occur...Ch. 2 - Why does the power factor of a load affect the...Ch. 2 - Why does the short-circuit test essentially show...Ch. 2 - Why does the open-circuit test essentially show...Ch. 2 - How does the per-unit system of measurement...Ch. 2 - Why can autotransformers handle more power than...
Ch. 2 - What are transformer taps? Why are they used?Ch. 2 - What are the problems associated with the Y—Y...Ch. 2 - What is a TCUL transformer?Ch. 2 - How can three-phase transformation be accomplished...Ch. 2 - Prob. 2.15QCh. 2 - Can a 60-Hz transformer be operated on a 50-Hz...Ch. 2 - What happens to a transformer when it is first...Ch. 2 - What is a potential transform? How is it used?Ch. 2 - What is a current transformer? How is it used?Ch. 2 - A distribution transformer is rated at 18 kVA,...Ch. 2 - Why does one hear a hum when standing near a large...Ch. 2 - A 100-kVA, 8000/277-V distribution transformer has...Ch. 2 - A single-phase power system is shown in Figure...Ch. 2 - Consider a simple power system consisting of an...Ch. 2 - The secondary winding of a real transformer has a...Ch. 2 - When travelers from the USA and Canada visit...Ch. 2 - A 1000-VA, 230/115-V transformer has been tested...Ch. 2 - A 30-kVA, 8000/230-V distribution transformer has...Ch. 2 - A 150-MVA, 15/200-kV, single-phase power...Ch. 2 - A 5000-kVA, 230/13.8-kV, single-phase power...Ch. 2 - A three-phase transformer bank is to handle 500...Ch. 2 - A 100-MVA, 230/115-kV, Y three-phase power...Ch. 2 - Three 20-kVA, 24,000/277-V distribution...Ch. 2 - A 14,000/480-V, three-phase, Y-connected...Ch. 2 - A 13.8-kV, single-phase generator supplies power...Ch. 2 - An autotransformer is used to connect a 12.6-kV...Ch. 2 - Prove the following statement: If a transformer...Ch. 2 - A 10-kVA, 480/120-V conventional transformer is to...Ch. 2 - A 10-kVA, 480/120-V conventional transformer is to...Ch. 2 - Two phases of a 14.4-kV, three-phase distribution...Ch. 2 - A 50-kVA, 20,000/480-V, 60-Hz, single-phase...Ch. 2 - Prove that the three-phase system of voltages on...Ch. 2 - Prove that the three-phase system of voltages on...Ch. 2 - A single-phase, 10-kVA, 480/120-V transformer is...Ch. 2 - Figure P2-4 shows a one-line diagram of a power...
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- 1. Determine the z-transform, including the region of convergence (ROC), of the following signals: a）x［n=｛3,0,0,0,0,51-4｝ b) x2[n] = ((1/3)^n ,n ≥0 2", n < 0 c) X3[n]= (1/3)^n- 2", n ≥ 0 0, n < 0arrow_forwardUse ECL configuration to realize a 2-inputs OR /NOR gate and verify its function using the truth table, showing the state of each transistor in the circuit. Assume Vcc 5V, VEE-0V & VREF=1.5V.arrow_forwardTwenty-five signals, ten of them have 3.4 kHz bandwidth, the other have bandwidth of 5 kHz are FDM/TDM multiplexed then modulated by an RF carrier of 800 kHz using AM modulator: Calculate minimum multiplexing and transmission bandwidths. Calculate the guard band (BWGuard) to be added between each two signals and below the first one to result a multiplexing bandwidth of 131.5 kHzarrow_forward
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- b) The joint probability function for the random variables X and Y is given in Table below. Find a) the marginal probability function of X and Y. P(Y/X) and P(X/Y). c) P(X ≥ 2, Y ≤ 2) y 1 2 3 10.05 0.05 0.1 P(X, Y) = X 20.05 0.1 0.35 3 0 0.2 0.1arrow_forwardSuppose a random variable X as pmf / Px (x) = { %, x = 1, 2, 3, 0, otherwise. find constand c ①P(X = 1), P(X 7,2), PC1 3) C CDFarrow_forwardSuppose that a coin is tossed three so that the sample space is Let X represent the number of heads that can come up. i) Find the probability function corresponding to the random variable X. Assuming that the coin is fair ii) Find the distribution function for the random variable X. iii) Obtain its graph.arrow_forward
- Q9 A single-phase transformer, 2500 / 250 V, 50 kVA, 50 Hz has the following parameters, the Primary and secondary resistances are 0.8 ohm and 0.012 ohm respectively, the primary and secondary reactance are 4 ohm and 0.04 ohm respectively and the transformer gives 96% maximum efficiency at 75% full-load. The magnetizing component of-load current is 1.2 A on 2500 V side. 1- Draw the equivalent circuit referred to primary (H.V side) and inserts all the values in it 2- Find out Ammeter, voltmeter and wattmeter readings on open-circuit and short-circuit test. If supply is given to 2500 V side in both cases. Ans. O.C. Test (Vo= 2500 V, lo=1.24 A, Wo=781.25 w) S.C. Test (Vsc =164.924 V, Isc =20 A, Wsc =800 w )arrow_forwardQ2-A)- Enumerate the various losses in transformer. Explain how each loss varies with (Load current, supply voltage). B)- Draw the pharos diagram at load on primary side.arrow_forwardQ2- What are the parameters and loss that can be determined during open-circuit test of singlephase transformer. Draw the circuit diagram of open-circuit test and explain how can you calculate the Parameters and loss.arrow_forward
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