EBK ELECTRIC CIRCUITS
10th Edition
ISBN: 8220100801792
Author: Riedel
Publisher: YUZU
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Chapter 11, Problem 46P
To determine
Derive the expression for the phase angles
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QUESTION 5 ✓
A 100 kVA, 7200 -480 V 50 Hz single phase transformer has the following parameters all given
in ohms:
RLS = 0.00800 RHS = 1.96 RfеHS = 53.2
XLS = 0.01510 XHS=4.55 XMHS=7800
This transformer is operated in step-down mode and delivers 75% of its rated power to a load that
has a power factor of 0.93 lagging.
a) Draw the equivalent circuit model of the transformer with the equivalent series Z's referred to
the high voltage side (3 Marks)
b) Find the total Zin of the transformer at the high side (3 Marks)
c) Find input Z of the transformer with the load disconnected (3 Marks)
d) Find input voltage at 75% of the load required to maintain the rated load voltage (3 Marks)
e) Find an exciting current with the load disconnected (3 Marks).
60 Marks
2- Sketch the circuits in the Block 1, Block 2
and Black 3, Then show the type of every
circuit
Iov
Vout
Block!
Vouts
20
t
Vout 2
t
lovT
Block 2
-lov
P-50HZ
25
*Vout 3
Block 3-2
2.2V 22V
Chapter 11 Solutions
EBK ELECTRIC CIRCUITS
Ch. 11.3 - The voltage from A to N in a balanced three-phase...Ch. 11.3 - Prob. 2APCh. 11.4 - Prob. 4APCh. 11.4 - Prob. 5APCh. 11.4 - Prob. 6APCh. 11.4 - Prob. 7APCh. 11.5 - Prob. 8APCh. 11.5 - Prob. 9APCh. 11 - Prob. 1PCh. 11 - Prob. 3P
Ch. 11 - Prob. 4PCh. 11 - Repeat Problem 11.4 but assume that the...Ch. 11 - Prob. 6PCh. 11 - Find I0 in the circuit in Fig. P11.7.
Find...Ch. 11 - Find the rms value of Io in the unbalanced...Ch. 11 - The time-domain expressions for three...Ch. 11 - Prob. 10PCh. 11 - The magnitude of the line voltage at the terminals...Ch. 11 - A balanced Δ-connected load has an impedance of...Ch. 11 - A balanced, three-phase circuit is characterized...Ch. 11 - Prob. 15PCh. 11 - In a balanced three-phase system, the source is a...Ch. 11 - Prob. 17PCh. 11 - The impedance Z in the balanced three-phase...Ch. 11 - For the circuit shown in Fig. P11.20, find
the...Ch. 11 - A balanced three-phase Δ-connected source is shown...Ch. 11 - Prob. 22PCh. 11 - Fine the rms magnitude and the phase angle of ICA...Ch. 11 - Prob. 24PCh. 11 - Prob. 25PCh. 11 - The line-to-neutral voltage at the terminals of...Ch. 11 - Prob. 27PCh. 11 - Prob. 28PCh. 11 - Prob. 29PCh. 11 - Calculate the complex power in each phase of the...Ch. 11 - Prob. 31PCh. 11 - Prob. 32PCh. 11 - Prob. 33PCh. 11 - Prob. 34PCh. 11 - Prob. 35PCh. 11 - Three balanced three-phase loads are connected in...Ch. 11 - Prob. 37PCh. 11 - Prob. 38PCh. 11 - Prob. 40PCh. 11 - Prob. 41PCh. 11 - Prob. 42PCh. 11 - Prob. 43PCh. 11 - Prob. 44PCh. 11 - Prob. 45PCh. 11 - Prob. 46PCh. 11 - Prob. 47PCh. 11 - Prob. 48PCh. 11 - Prob. 49PCh. 11 - Prob. 50PCh. 11 - Prob. 51PCh. 11 - Find the reading of each wattmeter in the circuit...Ch. 11 - Prob. 53PCh. 11 - Prob. 54PCh. 11 - Prob. 55PCh. 11 - Prob. 56PCh. 11 - Prob. 57PCh. 11 - Prob. 58PCh. 11 - Prob. 59PCh. 11 - Assume in Problem 11.59 that when the load drops...
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- 2. A 3-phase, 75 MVA, 11-8 kV star-connected alternator with a solidly earthed neutral point has the fol- lowing p.u. impedances based on rated phase voltage and rated phase current : Positive phase sequence impedance Negative phase sequence impedance Zero phase sequence impedance = j 2 p.u. = j 0.16 p.u. = j 0.08 p.u. Determine the steady-state fault current for the following: (i) 3-phase symmetrical short-circuit (ii) one line-to-earth fault (iii) two line-to-earth fault. The generated e.m.f. per phase is equal to the rated voltage. [(i)1840 A (ii) 4920 A (iii) 3580 A]arrow_forwardMake sure you indicate clearly the questions attempted Show your work to earn marks. • Enjoy Q1. With the help of a well-drawn diagram, explain concept map of an electromechanical system modelling. [20] Q2. Separately-excited generator develops a no load emf of 150V at an armature spend of 20 rev/s and a flux per pole of 0.1 Wb. determine the generated emf when a. The spend increases to 25rev/s and the pole flux remains unchanged. b. The speed remains at 20 rev/s and the pole flux is decreased to 0.08Wb. c. The speed increases to 24 rev/s and the pole flux is decreased to 0.07 Wb Write short notes on the following term a. Copper loss b. Iron loss c. Friction and Windage losses. [20]arrow_forwardQ4. A 415V, three phase, 50 Hz 4 pole, star connected induction motor ruins at 24 rev/s on full load. The rotor resistance and reactance per phase are 0.35 ohms and rotor respectively and the effective rotor stator turns ratio is 0.85:1 calculate: a. The synchronous speed b. The slip. c. The full load torque. d. The power output if mechanical losses amount to 770 W e. The maximum torque f. The speed at which maximum torque occurs g. The starting torque h. Direct on-line starting i. Star delta starting [20]arrow_forward
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- 4) For the sinusoidal signal m(t) = 2 sin(1000πt + 0.0557), shown down, is sampled, quantized and then encoded using the PCM technique. If a uniform quantizer, with 8 levels and a dynamic range [-2, 2], is used (a) Calculate the first 4 quantized samples and the ciated quantization errors. (b) Calculate the maximum quantization error (c) Calculate the signal-to-quantization- noise ratio. (d) Calculate the resultant bit rate. italicio (e) If it is required to increase the signal-to-quantization-noise ratio by 6 dB, how many quantization levels should be used in this case? What is the ratio between the new bit rate and the previous bit rate? msecarrow_forwardThe current of a 90.0 mH inductor changes with time in the form I=1.00t2 - 6.00t (in SI units). Determine the magnitude of the induced fem at a) t=1.00 s b) At what time will the fem equal zero?arrow_forwardA coil of 200 turns and 4 cm2 of section, is rotating in a magnetic field of 0.5 T. a) What must be its angular frequency to generate a maximum fem (εm) of 10 V?b) What is the value of εm if it rotates at 60 rev/s?arrow_forward
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