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[2+2+2+4 marks 10 marks] Question 1 (a) Describe what an electric circuit is, using a practical...
PROBLEM 5. TUNING A CIRCUIT: PRACTICAL RESONANCE. Consider a forced RLC circuit with L-1 (H), R-1...
PROBLEM 5. TUNING A CIRCUIT: PRACTICAL RESONANCE. Consider a forced RLC circuit with L-1 (H), R-10 (12) and C 丽0 (f). Suppose an alternating current supplies a electromotive force Et)100 coswt. The equation modeling the charge Q(t) on the capacitor is 650 Q"(t) 10Q650Q(t) 100 coswt. a. Is the damping over-, under- or critical? Find the form of the general solution. Identify the transient and steady-state parts of the solution. b. Find the amplitude C(w) of the steady-state piece (here...
Consider a Sinusoidally Driven LC Electrical Circuit, which Contains an Electric Potential Oscill...
Consider a Sinusoidally Driven LC Electrical Circuit, which Contains an Electric Potential Oscillator, E E, cos(or), an Inductor, L, and a Capacitor, C. Note that an Oscillating Charge,g).Forms on the Capacitor Plates, as well as an Oscillating Current, I(). throughout the Circuit, which is Associated with the Driven Frequency, ω , as Shown. 1. 1(6) gt) E(r) Recall that the Electric Potential Over an Inductor is Given by E , and the dl dr Electric Potential Over a Capacitor is...
QUESTION Cyril the Circuit Analyst is examining the interaction of both AC and DC sources with a circuit. The circu...
QUESTION Cyril the Circuit Analyst is examining the interaction of both AC and DC sources with a circuit. The circuit is drawn below. Pay careful attention to the arrows on the switches which show which are initially open, and which are initially closed. Assume that the capacitor is initially discharged at 0. All times are in seconds 10 mH 1-Os1-1s!=2s \ t = 5s 400 | 10cos(ox) 50 pF 10 mA At 0, the first switch closes connecting the current...
ans NO 2 TEE208/05 Question 1 (20 marks) (a) Sketch and label the I-V curves of:...
ans NO 2 TEE208/05 Question 1 (20 marks) (a) Sketch and label the I-V curves of: () a real germanium diode with forward voltage of 0.3V. 4 marks (i) a real sillcon zener diode with zener voltage of 4.7V. [4 marks] 4 marks] List two breakdown mechanisms for a zener diode. (b) (c) Rectifiers convert alternating current (AC) into direct current (DC). () Sketch and label the circuit of a simple half-wave rectifier. [3 marks] (U) Explain two differences between...
Q1)[10 marks, CLO: 01] While the switch of the circuit in the figure is held down...
Q1)[10 marks, CLO: 01] While the switch of the circuit in the figure is held down for 1.5 s, the 9V battery delivers 9 to the connected in series bulb, find: a. Show on the figure the conventional current flow and electron flow b. The amount of charge delivered 9 V c. The current produced in milliampere. d. Calculate the rate at which the electrical energy is converted in the bulb. e. Calculate the resistance of the bulb filament. 02)...
Pl. For the circuit shown, given that: vsi (t) 10 cos(100t +/3) V, vs2 (t) -2cos(300t...
Pl. For the circuit shown, given that: vsi (t) 10 cos(100t +/3) V, vs2 (t) -2cos(300t -/2) V, R1-22 L 0.2 H, Detremine the current i and the voltage vc Hint: To solve this problem we must use superposition. We first have to solve it in three separated circuits (in no particular order): DC steady state (supress all sources but the DC supply vs3). Phasor solution of circuit with vs1 and supression of the remaining sources, Phasor solution of circuit...
19, 20 2020 Question 2 (Marks: 15) You are performing a practical experiment with the circuit...
19, 20 2020 Question 2 (Marks: 15) You are performing a practical experiment with the circuit in figure 2a. You have performed all your calculations but at the end you notice that the voltage source does not give you 115cos(t) Volts but 121.cos(t + 8) Volts. You do not want to redo all your calculations so instead you decide to insert an impedance Zx into the circuit as in figure2b to balance out the voltage. 1Ω 1Ω 1Ω ZX 1Ω...
QUESTION 6 [10 marks] F or the circuit below, a) [5 marks] Fin d the current...
QUESTION
6
[10
marks]
F
or the circuit below,
a) [5 marks] Fin
d the current phasor
I
x
using superposition.
b) [3 marks] Verify your answer in part a) using nodal or mesh
analysis.
c) [2 marks] Gi
ven the frequency
!
=
2
!"#
/
!"#
,
write
the corresponding
values for elements
R, L, C, and
the
expressions for source
s
v
x
(t)
and
i
y
(t)
on the diagram below.
QUESTION 7 [10 marks] For...
Question 4: RC Circuit: a) Charging capacitor: A simple RC circuit is given in Figure 4a....
Question 4: RC Circuit: a) Charging capacitor: A simple RC circuit is given in Figure 4a. The capacitor is empty initially and switch was open for a long time. 4E, (V) EMF is used to charge the capacitor as switch is closed at t=0s. By using Kirchhoff's voltage law and Ohm's law that you learned so far, analyze this circuit and find the unknowns given below. 1)At t=0s. draw the equivalent circuit and find v. (Os), i. (Os), i (Os),...
(a) Explain what would happen if the gate is made positive with respect to the cathode during rev...
(a) Explain what would happen if the gate is made positive with respect to the cathode during reverse blocking of a thyristor (no diagram required) [15%] (b) Draw a well labelled plot showing the variation of the anode voltage versus anode current of a thyristor (no graph paper, explanation or circuit diagram needed) [20 %] (c) Consider the circuit diagram shown below. Here V is the DC source voltage and the initial charge of the capacitor C is q(0)-0 ....
PROBLEM 5. TUNING A CIRCUIT: PRACTICAL RESONANCE. Consider a forced RLC circuit with L-1 (H), R-10 (12) and C 丽0 (f). Suppose an alternating current supplies a electromotive force Et)100 coswt. The equation modeling the charge Q(t) on the capacitor is 650 Q"(t) 10Q650Q(t) 100 coswt. a. Is the damping over-, under- or critical? Find the form of the general solution. Identify the transient and steady-state parts of the solution. b. Find the amplitude C(w) of the steady-state piece (here...
Consider a Sinusoidally Driven LC Electrical Circuit, which Contains an Electric Potential Oscillator, E E, cos(or), an Inductor, L, and a Capacitor, C. Note that an Oscillating Charge,g).Forms on the Capacitor Plates, as well as an Oscillating Current, I(). throughout the Circuit, which is Associated with the Driven Frequency, ω , as Shown. 1. 1(6) gt) E(r) Recall that the Electric Potential Over an Inductor is Given by E , and the dl dr Electric Potential Over a Capacitor is...
QUESTION Cyril the Circuit Analyst is examining the interaction of both AC and DC sources with a circuit. The circuit is drawn below. Pay careful attention to the arrows on the switches which show which are initially open, and which are initially closed. Assume that the capacitor is initially discharged at 0. All times are in seconds 10 mH 1-Os1-1s!=2s \ t = 5s 400 | 10cos(ox) 50 pF 10 mA At 0, the first switch closes connecting the current...
ans NO 2 TEE208/05 Question 1 (20 marks) (a) Sketch and label the I-V curves of: () a real germanium diode with forward voltage of 0.3V. 4 marks (i) a real sillcon zener diode with zener voltage of 4.7V. [4 marks] 4 marks] List two breakdown mechanisms for a zener diode. (b) (c) Rectifiers convert alternating current (AC) into direct current (DC). () Sketch and label the circuit of a simple half-wave rectifier. [3 marks] (U) Explain two differences between...
Q1)[10 marks, CLO: 01] While the switch of the circuit in the figure is held down for 1.5 s, the 9V battery delivers 9 to the connected in series bulb, find: a. Show on the figure the conventional current flow and electron flow b. The amount of charge delivered 9 V c. The current produced in milliampere. d. Calculate the rate at which the electrical energy is converted in the bulb. e. Calculate the resistance of the bulb filament. 02)...
Pl. For the circuit shown, given that: vsi (t) 10 cos(100t +/3) V, vs2 (t) -2cos(300t -/2) V, R1-22 L 0.2 H, Detremine the current i and the voltage vc Hint: To solve this problem we must use superposition. We first have to solve it in three separated circuits (in no particular order): DC steady state (supress all sources but the DC supply vs3). Phasor solution of circuit with vs1 and supression of the remaining sources, Phasor solution of circuit...
19, 20 2020 Question 2 (Marks: 15) You are performing a practical experiment with the circuit in figure 2a. You have performed all your calculations but at the end you notice that the voltage source does not give you 115cos(t) Volts but 121.cos(t + 8) Volts. You do not want to redo all your calculations so instead you decide to insert an impedance Zx into the circuit as in figure2b to balance out the voltage. 1Ω 1Ω 1Ω ZX 1Ω...
QUESTION
6
[10
marks]
F
or the circuit below,
a) [5 marks] Fin
d the current phasor
I
x
using superposition.
b) [3 marks] Verify your answer in part a) using nodal or mesh
analysis.
c) [2 marks] Gi
ven the frequency
!
=
2
!"#
/
!"#
,
write
the corresponding
values for elements
R, L, C, and
the
expressions for source
s
v
x
(t)
and
i
y
(t)
on the diagram below.
QUESTION 7 [10 marks] For...
Question 4: RC Circuit: a) Charging capacitor: A simple RC circuit is given in Figure 4a. The capacitor is empty initially and switch was open for a long time. 4E, (V) EMF is used to charge the capacitor as switch is closed at t=0s. By using Kirchhoff's voltage law and Ohm's law that you learned so far, analyze this circuit and find the unknowns given below. 1)At t=0s. draw the equivalent circuit and find v. (Os), i. (Os), i (Os),...
(a) Explain what would happen if the gate is made positive with respect to the cathode during reverse blocking of a thyristor (no diagram required) [15%] (b) Draw a well labelled plot showing the variation of the anode voltage versus anode current of a thyristor (no graph paper, explanation or circuit diagram needed) [20 %] (c) Consider the circuit diagram shown below. Here V is the DC source voltage and the initial charge of the capacitor C is q(0)-0 ....
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