ECE 3355 exam questions with answers and rationales 2026 for university of
Houston spring final exam
ECE : ELECTRONICS
University of Houston – Spring 2026/2027 Final Exam
Course Scope: Signal/amplifier concepts, OPAMPs, Diodes, BJTs (Biasing,
Small/Large Signal), Transistor Amplifiers.
PART I: OPERATIONAL AMPLIFIERS (OPAMPS) – Questions 1-40
Q1. An ideal operational amplifier (op-amp) has:
A) Finite open-loop gain
B) Infinite input impedance
C) Non-zero output impedance
D) Finite bandwidth
Answer: B
,Rationale: Ideal op-amp assumptions for analysis include infinite open-loop gain
(AOL), infinite input impedance (no current flows into inputs), zero output
impedance, and infinite bandwidth.
Q2. For an ideal op-amp in a linear circuit, the voltage at the inverting terminal
equals the voltage at the non-inverting terminal. This concept is known as:
A) Thevenin’s theorem
B) Virtual short (virtual ground)
C) Miller effect
D) Superposition
Answer: B
Rationale: Due to very high open-loop gain, the differential input voltage must be
nearly zero for the output to be finite. This creates a "virtual short" between the
two input terminals.
Q3. In an ideal op-amp, the current flowing into the input terminals is:
A) Equal to the supply current
B) Maximum at saturation
,C) Zero
D) Equal to the output current
Answer: C
Rationale: Infinite input impedance implies that no current flows into the
inverting or non-inverting input pins of an ideal op-amp.
Q4. An inverting amplifier configuration has the input signal applied to the:
A) Non-inverting terminal
B) Inverting terminal through a resistor
C) Output terminal
D) Power supply pin
Answer: B
Rationale: In an inverting amplifier, the input signal is applied to the inverting (-)
terminal via an input resistor (R1), while the non-inverting (+) terminal is
grounded.
, Q5. In the standard inverting amplifier configuration (R1 input, Rf feedback), the
closed-loop voltage gain (Av) is given by:
A)
1
+
R
f
R
1
1+
R
1
R
f
Houston spring final exam
ECE : ELECTRONICS
University of Houston – Spring 2026/2027 Final Exam
Course Scope: Signal/amplifier concepts, OPAMPs, Diodes, BJTs (Biasing,
Small/Large Signal), Transistor Amplifiers.
PART I: OPERATIONAL AMPLIFIERS (OPAMPS) – Questions 1-40
Q1. An ideal operational amplifier (op-amp) has:
A) Finite open-loop gain
B) Infinite input impedance
C) Non-zero output impedance
D) Finite bandwidth
Answer: B
,Rationale: Ideal op-amp assumptions for analysis include infinite open-loop gain
(AOL), infinite input impedance (no current flows into inputs), zero output
impedance, and infinite bandwidth.
Q2. For an ideal op-amp in a linear circuit, the voltage at the inverting terminal
equals the voltage at the non-inverting terminal. This concept is known as:
A) Thevenin’s theorem
B) Virtual short (virtual ground)
C) Miller effect
D) Superposition
Answer: B
Rationale: Due to very high open-loop gain, the differential input voltage must be
nearly zero for the output to be finite. This creates a "virtual short" between the
two input terminals.
Q3. In an ideal op-amp, the current flowing into the input terminals is:
A) Equal to the supply current
B) Maximum at saturation
,C) Zero
D) Equal to the output current
Answer: C
Rationale: Infinite input impedance implies that no current flows into the
inverting or non-inverting input pins of an ideal op-amp.
Q4. An inverting amplifier configuration has the input signal applied to the:
A) Non-inverting terminal
B) Inverting terminal through a resistor
C) Output terminal
D) Power supply pin
Answer: B
Rationale: In an inverting amplifier, the input signal is applied to the inverting (-)
terminal via an input resistor (R1), while the non-inverting (+) terminal is
grounded.
, Q5. In the standard inverting amplifier configuration (R1 input, Rf feedback), the
closed-loop voltage gain (Av) is given by:
A)
1
+
R
f
R
1
1+
R
1
R
f
