Engineering Electromagnetics
9th Edition
ISBN: 9781260029963
Author: Hayt
Publisher: MCG
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Chapter 9, Problem 9.24P
A
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Assignment #2
A 110-V, three-phase, Y-connected, 8 pole, 48-slot, 6000-rpm,
double-layer wound, synchronous generator has 12 turns per coil.
If one side of the coil is in slot 1, the other side is in slot 6. There
are 4 parallel paths. When the generator delivers the rated load at
a line voltage of 110 V, the voltage regulation is 5%. What is the
flux per pole?
Draw two consecutive phasegroups of one of the phase windings
and connect them (a) in series and (b) in parallel showing the
Start (S) and Finish (F) of both connections. (A separate drawing
for each connection)
3-4 Transmissiva Live of 120km has
R= 0.2
~2/15
X= 0.8 -2/km
Y = 15H/6 5/km
The line is supplies a load of 45 kV, SOMW, 0.8 lead p.f
find sending voltage,
Sending Current
p.f. Sanding
Voltage Regulation
⑨Voltage
5
Ⓒ charching coming!
изу
usy π cct
ले
A (medium) single phase transmission line 100 km long has the following
constants :
Resistance/km = 0.25 Q;
Susceptance/km = 14 × 10° siemen ;
Reactance/km = 0.8
Receiving end line voltage = 66,000 V
Assuming that the total capacitance of the line is localised at the receiving end alone, determine
(i) the sending end current (ii) the sending end voltage (iii) regulation and (iv) supply power factor.
The line is delivering 15,000 kW at 0.8 power factor Lead Draw the phasor diagram to illustrate
your calculations.
Chapter 9 Solutions
Engineering Electromagnetics
Ch. 9 - Prob. 9.1PCh. 9 - Prob. 9.2PCh. 9 - Prob. 9.3PCh. 9 - A rectangular loop of wire containing a...Ch. 9 - The location of the sliding bar in Figure 9.5 is...Ch. 9 - Prob. 9.6PCh. 9 - The rails in Figure 9.6 each have a resistance of...Ch. 9 - A perfectly conducting filament is formed into a...Ch. 9 - A square filamentary loop of wire is 25 cm on a...Ch. 9 - (a) Show that the ratio of the amplitudes of the...
Ch. 9 - Let the internal dimensions of a coaxial capacitor...Ch. 9 - Prob. 9.12PCh. 9 - En free space it is known that E = E0/r sin...Ch. 9 - A voltage source V0, sin cot is connected between...Ch. 9 - Use each of Maxwells equations in point form to...Ch. 9 - Derive the continuity equation from Maxwells...Ch. 9 - The electric field intensity in the region...Ch. 9 - Prob. 9.18PCh. 9 - In Section 9.1. Faradays law was used to show that...Ch. 9 - Prob. 9.20PCh. 9 - (a) Show that under static field conditions; Eq....Ch. 9 - Prob. 9.22PCh. 9 - Prob. 9.23PCh. 9 - A vector potential is given as A = A0 cos(đ�œ”t =...Ch. 9 - Prob. 9.25PCh. 9 - Write Maxwells equations in point form in terms of...
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- 1. An electromagnetic device is shown below. The coil in the left side is connected to a steady AC power source. The left coil generates a changing magnetic flux, which is = 1.5cos(120πt +л/6) T. Calculate the voltage vs generated across the right coil given the number of turns of the right coil is 5 (You only need to calculate the magnitude). Vparrow_forwardFor the closed loop system shown in figure, determine the following:arrow_forwardWhat is the open loop transfer function and feedback for thia system? Determine the type of the open loop system. Find the poles s1 and s2 of the open loop system. If the input is a step function R(s)=1/s, find the step response c(t) of the open loop.arrow_forward
- not use ai please don'tarrow_forward2. A DC generator is shown below. This DC generator is driven by a prime mover and rotating in counterclockwise direction. The armature is connected with a load resistor. (i) Using cross (x) or dot (*) to indicate the current direction of each conductor in the armature. (ii) If we want to reverse the polarity of the generated armature voltage, what can we do to? rotation S load Narrow_forward6. The figures below show the equivalent circuit of a separately excited DC generator and the approximate relationship between the flux of main field and exciting current. The field current I can be regulated by the variable resistor Ry, and the battery voltage supplying power to the exciter is 12V. The armature resistance Ro is 20, and the load is 182. For the DC generator, we aim to keep the voltage across the load (RL) constant in different speed range conditions. In the beginning, the flux is 0.12 Wb, the DC generator speed is 1000 rpm, and the generated voltage E。 is 100 V. Calculate: (1) The current flowing through the load. (2) When the speed of generator changes to 1500 rpm, how should we adjust the exciting current Ix to ensure Ę is still 100 V. (Hint: E₁ = Zno/60) (3) When the speed of generator changes to 500 rpm, how should we adjust the exciting current Ix to ensure Eo is still 100 V. (Hint: Eo = Zno/60) Rf ww (Wb) 0.17 0.15 12 V 1x F ele 1 1 2 ell Eo Ro ww 9 w RL Ix (A)arrow_forward
- 7. For a shunt excited motor, the maximum allowable current is twice of the full-load current. The full-load current is 10 A. The equivalent circuit of this motor is also shown below. The rheostat can change the resistance by moving the slider (contact). The counter electromotive force (CEMF) for this motor is 100 V at 1000 rpm. The power supply E, is 200 V. In this case: (1) Calculate the minimum resistor value R at 0 rpm ensuing the motor is running within the safe range, and calculate the power consumed by the rheostat R. (2) Calculate the minimum effective resistor value R at 100 rpm ensuing the motor is running within the safe range, and calculate the power consumed by the rheostat R and the delivered mechanical power. (3) Calculate the minimum resistor value R at 500 rpm ensuing the motor is running within the safe range, and calculate the power consumed by the rheostat R the delivered mechanical power. shunt field R armature rheostat Es + Eoarrow_forward4. For a general DC generator, we aim to achieve constant output voltage at different rotating speeds. (1) List two factors influencing the output voltage for a given DC generator. (2) How does the change of the load (assuming the load is the current flowing though the resistor) will impact on the generated voltage for (a) separately excited DC generator, (b) Shunt DC generator, and (c) cumulative compound DC generator?arrow_forward3. A DC motor is shown below. The armature is supplied by an external battery, and the current flowing direction of each conduction is depicted in the figure. (i) Draw the Lorentz force direction applied on each conductor in the armature. (ii) In which direction will the motor spin? What can we do to reverse the spinning direction? S Narrow_forward
- 5. conditions. For a general DC motor, we aim to control the speed of the motor at different loading (1) List two factors influencing the motor speed for a given DC motor. (2) List three ways to stop a motor and comment on each method?arrow_forwardSolve by Pen and Paper not using chatgptarrow_forwardf. The figure below shows two stage RC coupled amplifier. If the input resistance Rin of each stage is 1kN. (B = 100). Determine its overall voltage gain. (5 marks) +15V ΣΚΩ kn 10kΩ 10ΚΩ output 35 ΚΩ 2ΚΩ 5kЛ 2ΚΩarrow_forward
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