ECE 3340 exam questions with answers and rationales 2026 for university of
Houston spring final exam
ECE 3340 Questions (Based on Numerical Methods)
Question 1
A student is analyzing a sound file containing the word "Robert" corrupted by
high-frequency interference and white noise. According to the ECE 3340 project
guidelines, what is the correct sequence of steps to recover the clean signal?
A. Apply a bandpass filter to the entire file, then listen to the result.
B. Split the file into time segments, filter each segment to remove noise, and
reassemble.
C. Increase the volume of the file to drown out the noise floor.
D. Convert the signal to a lower sampling rate to eliminate the high-frequency
noise.
Answer: B
Rationale: The Numerical Methods project specifications indicate that to recover
distinct sounds (like "I", "am", "Ro", "bert"), you must first split the recording into
,time segments (using a spectrogram), then apply specific filters to each segment
to remove the noise and interference targeted in that interval, before
reassembling the segments .
Question 2
In a numerical analysis project, a signal is corrupted by interference with a
frequency of 1750 Hz. If the root mean square (rms) of the desired signal is x_rms,
what must be the standard deviation of the added Laplace noise according to the
HW4A specifications?
A. Equal to the rms of the signal.
B. Less than the rms of the signal.
C. At least 2 times the rms of the signal.
D. Exactly 10 times the rms of the signal.
Answer: C
Rationale: The project specification requires that σ (the noise standard deviation)
must be >= 2 * x_rms (twice the signal rms). Additionally, the interference must
be 10 times the signal rms. These parameters ensure the signal is sufficiently
"buried" to test the effectiveness of the filtering algorithms .
⚡ Alternative EE 3340 (Electronics II) Practice Questions
,If your course is actually the "Electronics" track, use these questions to study BJT
amplifiers.
Question 3
A common-emitter BJT amplifier has a supply voltage of +15V. The emitter
resistor is 1kΩ, and the collector resistor is 3kΩ. If the BJT has a β of 100, what is
the approximate collector-emitter voltage (V_CE)?
A. 0.7 V
B. 4.5 V
C. 7.5 V
D. 15 V
Answer: C
Rationale: This is standard DC bias analysis. If the base current is set to allow the
transistor to operate in the active region, the voltage drop across the resistors
results in a V_CE that is roughly halfway between VCC and ground for maximum
swing, which calculates to approximately 7.5V given the resistor values .
Question 4
, In a differential amplifier configuration, a 0.1V differential signal is applied
between the two bases. If the collector resistors are 12kΩ and the emitter current
source is 1mA, what is the approximate voltage gain (assuming α ≈ 1)?
A. 10
B. 120
C. 480
D. 1200
Answer: B
Rationale: The gain of a differential amplifier is calculated as A_v = R_C / (r_e).
The dynamic resistance r_e is derived from the bias current (approximately 0.5mA
per transistor). This yields a gain in the range of 120 for the given resistor values .
Question 5
For the BJT amplifier shown, if the Early Voltage (VA) is considered infinite, what
is the effect on the small-signal output resistance (ro)?
A. ro becomes zero, shorting the collector to ground.
B. ro becomes infinite, approximated as an open circuit.
C. ro becomes equal to the thermal voltage (VT).
D. ro becomes equal to the collector resistor (RC).
Houston spring final exam
ECE 3340 Questions (Based on Numerical Methods)
Question 1
A student is analyzing a sound file containing the word "Robert" corrupted by
high-frequency interference and white noise. According to the ECE 3340 project
guidelines, what is the correct sequence of steps to recover the clean signal?
A. Apply a bandpass filter to the entire file, then listen to the result.
B. Split the file into time segments, filter each segment to remove noise, and
reassemble.
C. Increase the volume of the file to drown out the noise floor.
D. Convert the signal to a lower sampling rate to eliminate the high-frequency
noise.
Answer: B
Rationale: The Numerical Methods project specifications indicate that to recover
distinct sounds (like "I", "am", "Ro", "bert"), you must first split the recording into
,time segments (using a spectrogram), then apply specific filters to each segment
to remove the noise and interference targeted in that interval, before
reassembling the segments .
Question 2
In a numerical analysis project, a signal is corrupted by interference with a
frequency of 1750 Hz. If the root mean square (rms) of the desired signal is x_rms,
what must be the standard deviation of the added Laplace noise according to the
HW4A specifications?
A. Equal to the rms of the signal.
B. Less than the rms of the signal.
C. At least 2 times the rms of the signal.
D. Exactly 10 times the rms of the signal.
Answer: C
Rationale: The project specification requires that σ (the noise standard deviation)
must be >= 2 * x_rms (twice the signal rms). Additionally, the interference must
be 10 times the signal rms. These parameters ensure the signal is sufficiently
"buried" to test the effectiveness of the filtering algorithms .
⚡ Alternative EE 3340 (Electronics II) Practice Questions
,If your course is actually the "Electronics" track, use these questions to study BJT
amplifiers.
Question 3
A common-emitter BJT amplifier has a supply voltage of +15V. The emitter
resistor is 1kΩ, and the collector resistor is 3kΩ. If the BJT has a β of 100, what is
the approximate collector-emitter voltage (V_CE)?
A. 0.7 V
B. 4.5 V
C. 7.5 V
D. 15 V
Answer: C
Rationale: This is standard DC bias analysis. If the base current is set to allow the
transistor to operate in the active region, the voltage drop across the resistors
results in a V_CE that is roughly halfway between VCC and ground for maximum
swing, which calculates to approximately 7.5V given the resistor values .
Question 4
, In a differential amplifier configuration, a 0.1V differential signal is applied
between the two bases. If the collector resistors are 12kΩ and the emitter current
source is 1mA, what is the approximate voltage gain (assuming α ≈ 1)?
A. 10
B. 120
C. 480
D. 1200
Answer: B
Rationale: The gain of a differential amplifier is calculated as A_v = R_C / (r_e).
The dynamic resistance r_e is derived from the bias current (approximately 0.5mA
per transistor). This yields a gain in the range of 120 for the given resistor values .
Question 5
For the BJT amplifier shown, if the Early Voltage (VA) is considered infinite, what
is the effect on the small-signal output resistance (ro)?
A. ro becomes zero, shorting the collector to ground.
B. ro becomes infinite, approximated as an open circuit.
C. ro becomes equal to the thermal voltage (VT).
D. ro becomes equal to the collector resistor (RC).
