Two parallel connected loads take a total of 2.4 kW, with a 0.8
line delay at 120 Vrms and 60 Hz. One load absorbs 1.5 kW with a fp
delay of 0.707.
Determine:
a) The fp of the second charge
b) The parallel element required to correct the fp of the two loads
and convert it to a delay of 0.9
In: Electrical Engineering
A 45-MVA, 13.8 kV synchronous machine is operating as a
synchronous
condenser, as discussed in Appendix D (section D.4.1). It’s
short-circuit ratio
is 1.68 and the field current at rated voltage, no load is 490 A.
Assume the
generator to be connected directly to an 13.8 kV source
a. What is the saturated synchronous reactance of the generator
in per unit
and in ohms per phase?
The generator field current is adjusted to 260 A.
b. Draw a phasor diagram, indicating the terminal voltage, internal
voltage,
and armature current.
c. Calculate the armature current magnitude (per unit and amperes)
and its
relative phase angle with respect to the terminal voltage.
d. Under these conditions, does the synchronous condenser appear
inductive
or capacitive to the 11.5 kV system?
In: Electrical Engineering
Assume that you are using a piezoelectric material to build a micro/MEMS actuator beam in order to pick up a red-blood cell (with mass of ~1picogram or 10-12grams). If the dimensions of this actuator beam are length=100µm, width=10μm, and thickness=1μm, what is the minimal voltage you need to apply to this piezoelectric actuator in order to pick up the red-blood cell? Please write down all your assumptions used to estimate the voltage required.
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A 280-V, 3Ø AC power system, Y-connected three-phase generator connected through a three-phase transmission line to a Y-connected load. The transmission line has an impedance of (0.02+j0.4) Ω/phase, and the load has an impedance of (4+j3) Ω per phase. Determine the;(a)line current (IL) at the load [2Marks] (b)line and phase voltage of the load[2 Marks](c)active power, reactive and apparent power [2 Marks](d) power factor and specify whether it is lagging or leading. [4 Marks]
In: Electrical Engineering
Please Create the Verilog/Vivado Code For:
An LFSR Pseudonumber generator, and
the testbench for test it,
please comment and explain the answer as much as possible
waveform simulation answer would be nice too!
In: Electrical Engineering
stion 3:
A half-wave rectifier with a capacitor filter has Vm = 200 V, R = 1
kw, C = 1000 pF, and
w = 377
(a) Determine the ratio of the RC time constant to the period of
the input sine wave.
What is the significance of this ratio? (b) Determine the
peak-to-peak ripple voltage
using the exact equations. (c) Determine the ripple using the
approximate formula in Eq.
(3-51).
In: Electrical Engineering
Design and model a battery charger with filter, diode bridge, and transformer. The battery to recharge is 12 VDC (auto). Suppose the source is a 120 VAC @ 60HZ residential circuit. The output voltage cannot vary more than 5%. Prepare a cost estimate for your design and compare the cost with business models. Explain the differences in cost. Investigate the environmental and social impact of producing 1,000,000 units of each. Assume that a social job is generated for every $ 50,000 of investment and 1 Lb. of CO2 for each environmental KWH of energy used in the production of the units.
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Why is the starting current high in a DC motor? Explain the working of a four-point starter for a DC machine.
In: Electrical Engineering
(b) P-type doping in deep ultraviolet AlGaN based LEDs suffer from low hole mobility.
(i) Sketch a design of a tunnel junction for a DUV LED operating at 280 nm.
Explain how the tunnel junction operates in a DUV LED.
In: Electrical Engineering
SYSTEM VERILOG:
Using your preferred HDL program, design a complete 4-bit Carry
Look Ahead (CLA) adder
module.
In: Electrical Engineering
Draw a sample metal detector scenario and explain the target detection principle through the electromagnetic interaction equation. Give an example of an application where the metal detector performs well and badly. Which auxiliary sensor can be used to understand that the material is explosive?
In: Electrical Engineering
In: Electrical Engineering
In: Electrical Engineering
if the received power at a reference distance do=1km,
is equal to 1 microwatt, Find the received power at distances 21km,
5km,10km and 20km from the same transmitters.
I) free space
ii) n=4
iii) two ray ground reflection using the exact expression.
Assume f=1800MHz.
ht=40,
hr= 3m, Gt=Gr= 0db.
In: Electrical Engineering
Elaborate with your own words the importance of Laplace transform in electric circuit analysis. Explain also the applications of Laplace transform in communication systems.
In: Electrical Engineering