FE ELECTRICAL AND COMPUTER ENGINEERING
EXAM QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALES 2026 Q&A
| INSTANT DOWNLOAD PDF
1. What is the unit of electric charge?
A. Volt
B. Ampere
C. Coulomb
D. Ohm
Rationale: Electric charge is measured in coulombs, defined as one
ampere-second.
2. The time constant of an RC circuit is defined as:
A. R + C
B. R × C
C. R / C
D. C / R
Rationale: The time constant τ for an RC circuit is the product of
resistance and capacitance, τ = RC.
3. Which of the following is true for an ideal transformer?
A. Input and output currents are equal
B. The ratio of voltages is equal to the turns ratio
C. Power is not conserved
D. It has 100% efficiency only at resonance
Rationale: In an ideal transformer, the voltage ratio equals the
turns ratio, and power in equals power out.
,4. The primary purpose of a capacitor in a DC circuit is to:
A. Store energy in the form of a magnetic field
B. Store energy in the form of an electric field
C. Resist current flow
D. Convert AC to DC
Rationale: Capacitors store energy in the electric field between
their plates.
5. Ohm’s law states:
A. V = I / R
B. V = I × R
C. I = V × R
D. P = I / V
Rationale: Ohm’s law defines the relationship between voltage,
current, and resistance: V = IR.
6. In three-phase systems, the line voltage is related to phase
voltage by:
A. V_L = V_Ph
B. V_L = 2 × V_Ph
C. V_L = √3 × V_Ph
D. V_L = V_Ph / √3
Rationale: For a balanced three-phase system, line voltage equals
√3 times the phase voltage.
7. The derivative of sin(x) is:
A. sin(x)
B. cos(x)
C. -sin(x)
D. -cos(x)
Rationale: Standard calculus result: d/dx[sin(x)] = cos(x).
, 8. The equivalent resistance of two resistors, 6 Ω and 3 Ω, in parallel
is:
A. 9 Ω
B. 2 Ω
C. 1.5 Ω
D. 2 Ω
Rationale: For parallel resistors: 1/Req = 1/R1 + 1/R2 → 1/Req =
1/6 + 1/3 = 1/2 → Req = 2 Ω.
9. In a purely inductive AC circuit, the current:
A. Leads the voltage by 90°
B. Lags the voltage by 90°
C. Is in phase with voltage
D. Lags the voltage by 90°
Rationale: In an inductive AC circuit, voltage leads current by 90°;
current lags voltage.
10. Which logic gate outputs true only when all inputs are true?
A. OR
B. XOR
C. NAND
D. AND
Rationale: The AND gate outputs 1 only if all inputs are 1.
11. A current of 2 A flows through a 5 Ω resistor. The voltage
across the resistor is:
A. 2.5 V
B. 10 V
C. 7 V
D. 5 V
Rationale: Using Ohm’s law, V = IR = 2 × 5 = 10 V.
EXAM QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALES 2026 Q&A
| INSTANT DOWNLOAD PDF
1. What is the unit of electric charge?
A. Volt
B. Ampere
C. Coulomb
D. Ohm
Rationale: Electric charge is measured in coulombs, defined as one
ampere-second.
2. The time constant of an RC circuit is defined as:
A. R + C
B. R × C
C. R / C
D. C / R
Rationale: The time constant τ for an RC circuit is the product of
resistance and capacitance, τ = RC.
3. Which of the following is true for an ideal transformer?
A. Input and output currents are equal
B. The ratio of voltages is equal to the turns ratio
C. Power is not conserved
D. It has 100% efficiency only at resonance
Rationale: In an ideal transformer, the voltage ratio equals the
turns ratio, and power in equals power out.
,4. The primary purpose of a capacitor in a DC circuit is to:
A. Store energy in the form of a magnetic field
B. Store energy in the form of an electric field
C. Resist current flow
D. Convert AC to DC
Rationale: Capacitors store energy in the electric field between
their plates.
5. Ohm’s law states:
A. V = I / R
B. V = I × R
C. I = V × R
D. P = I / V
Rationale: Ohm’s law defines the relationship between voltage,
current, and resistance: V = IR.
6. In three-phase systems, the line voltage is related to phase
voltage by:
A. V_L = V_Ph
B. V_L = 2 × V_Ph
C. V_L = √3 × V_Ph
D. V_L = V_Ph / √3
Rationale: For a balanced three-phase system, line voltage equals
√3 times the phase voltage.
7. The derivative of sin(x) is:
A. sin(x)
B. cos(x)
C. -sin(x)
D. -cos(x)
Rationale: Standard calculus result: d/dx[sin(x)] = cos(x).
, 8. The equivalent resistance of two resistors, 6 Ω and 3 Ω, in parallel
is:
A. 9 Ω
B. 2 Ω
C. 1.5 Ω
D. 2 Ω
Rationale: For parallel resistors: 1/Req = 1/R1 + 1/R2 → 1/Req =
1/6 + 1/3 = 1/2 → Req = 2 Ω.
9. In a purely inductive AC circuit, the current:
A. Leads the voltage by 90°
B. Lags the voltage by 90°
C. Is in phase with voltage
D. Lags the voltage by 90°
Rationale: In an inductive AC circuit, voltage leads current by 90°;
current lags voltage.
10. Which logic gate outputs true only when all inputs are true?
A. OR
B. XOR
C. NAND
D. AND
Rationale: The AND gate outputs 1 only if all inputs are 1.
11. A current of 2 A flows through a 5 Ω resistor. The voltage
across the resistor is:
A. 2.5 V
B. 10 V
C. 7 V
D. 5 V
Rationale: Using Ohm’s law, V = IR = 2 × 5 = 10 V.
