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Electrical Engineering
A discrete-time system is described by the following rule
y(n)=(-1)^n x(n) + 2x(n -1)
where x is the input signal, and y the output signal.
Classify the system as:
1-Determined
2-With memory
y(n)=(-1)^n x(n) + 2x(n -1)
where x is the input signal, and y the output signal.
Classify the system as:
1-Determined
2-With memory
Electrical Engineering
With an uncontrolled 1-phase half-wave rectifier with a phase voltage of 120 V.
A 10 Ω load is fed. Neglecting circuit losses,
a) Find the output voltage and current.
b) Find the effective phase current.
A 10 Ω load is fed. Neglecting circuit losses,
a) Find the output voltage and current.
b) Find the effective phase current.
Electrical Engineering
Write a MATLAB program that ask the user, when running the code, to enter the age of 20 persons inside
a certain vector, then using for or while loop, the program should list and display all the ages that are below
30, and find and display their numbers and their average age.
a certain vector, then using for or while loop, the program should list and display all the ages that are below
30, and find and display their numbers and their average age.
Electrical Engineering
Why is zener diode used in drivers?
Electrical Engineering
Let us calculate the resistances of star network, which are equivalent to that of delta
network as shown in the following figure.
network as shown in the following figure.
Electrical Engineering
An RLC series circuit has R = 100 ohms, C = 25 µF, and L = 0.16 H. For what angular
frequency of an ac voltage is the current flow maximum?
frequency of an ac voltage is the current flow maximum?
Electrical Engineering
If an R = 1-kΩ resistor, a C = 1-µF capacitor, and an L = 0.2-H inductor are connected in
series with a V = 150 sin (377t) volts source, what is the maximum current delivered by the source?
series with a V = 150 sin (377t) volts source, what is the maximum current delivered by the source?
Electrical Engineering
When a series RLC circuit is subject to 48 V, VR is 15 V, and VL is 22 V. What is the voltage
across the capacitor?
across the capacitor?
Electrical Engineering
A series RLC circuit consists of a 20 Ω resistor, a 51 μF capacitor, and a 25 mH inductor. If
the source frequency is 50 Hz, and the circuit current is 350 mA, what is the applied voltage?
Also find the following:
(a) If the applied voltage to the circuit of above mentioned ckt is 12 V, what is the voltage
across the capacitor?
(b) In the circuit of above mentioned Ckt, what is the phase angle between the voltage
and the current?
the source frequency is 50 Hz, and the circuit current is 350 mA, what is the applied voltage?
Also find the following:
(a) If the applied voltage to the circuit of above mentioned ckt is 12 V, what is the voltage
across the capacitor?
(b) In the circuit of above mentioned Ckt, what is the phase angle between the voltage
and the current?
Electrical Engineering
3.1 A copper and an aluminium conductor are connected in parallel to supply a load
of 300A over a distance of 500m. The two conductors have equal cross-sectional
areas of 50mm2. Take the resistivity of coper as 0.018µΩm and that of aluminium as
0.028µΩm and calculate
3.1.1 the total resistance of the two conductors (9)
3.1.2 The voltage drop across the compound line (3)
3.1.3 The current carried by each conductor (6)
[
of 300A over a distance of 500m. The two conductors have equal cross-sectional
areas of 50mm2. Take the resistivity of coper as 0.018µΩm and that of aluminium as
0.028µΩm and calculate
3.1.1 the total resistance of the two conductors (9)
3.1.2 The voltage drop across the compound line (3)
3.1.3 The current carried by each conductor (6)
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