ELE 146 EXAM / ACTUAL ELE 146 INTRODUCTION TO ELECTRICAL
ENGINEERING (DC/AC CIRCUITS , DIGITAL LOGIC,POWER & SAFETY)
FINAL EXAM 2026/2027 AND STUDY GUIDE ACCURATE APPROVED
QUESTIONS AND CORRECT DETAILED ANSWERS WITH RATIONALES
(100 % CORRECT VERIFIED SOLUTIONS) LATEST UPDATED VERSION
|ALREADY GRADED A+
1. What is the SI unit of electric charge?
A) Ampere
B) Volt
C) Coulomb (CORRECT ANSWER)
D) Ohm
Rationale: The coulomb is defined as the amount of charge transported by a
current of one ampere in one second.
2. Which of the following materials has the highest electrical conductivity?
A) Silicon
B) Silver (CORRECT ANSWER)
C) Aluminum
D) Carbon
Rationale: Silver has the highest conductivity of any metal, though copper is more
commonly used due to cost.
3. According to Ohm’s Law, if the voltage across a resistor is doubled and the
resistance remains constant, the current will:
,A) Remain the same
B) Double (CORRECT ANSWER)
C) Halve
D) Increase by a factor of four
Rationale: I = V/R, so current is directly proportional to voltage.
4. A resistor has color bands: Red, Red, Orange, Gold. What is its nominal value
and tolerance?
A) 22 Ki, ±10%
B) 2.2 Ki, ±5%
C) 22 Ki, ±5% (CORRECT ANSWER)
D) 220 Ω, ±5%
*Rationale: Red=2, Red=2, Orange=×1,000 = 22,000 Ω or 22 Ki. Gold = ±5%. *
5. Which theorem states that any linear bilateral network can be replaced by a
single voltage source in series with a single impedance?
A) Norton’s Theorem
B) Superposition Theorem
C) The venin’s Theorem (CORRECT ANSWER)
D) Maximum Power Transfer Theorem
Rationale: The venin’s theorem simplifies a circuit to a voltage source (Vth) in
series with a resistor (Roth).
6. In a purely resistive AC circuit, the voltage and current are:
A) 90° out of phase
,B) 180° out of phase
C) In phase (CORRECT ANSWER)
D) 45° out of phase
Rationale: With no reactance, the current rises and falls simultaneously with
voltage.
7. What is the total capacitance of two 10 µF capacitors connected in series?
A) 20 µF
B) 10 µF
C) 5 µF (CORRECT ANSWER)
D) 0.2 µF
*Rationale: For series capacitors, 1/Total = 1/10 + 1/10 = 2/10, so Total = 5 µF. *
8. The RMS value of a sinusoidal AC voltage is equal to:
A) Peak value × 0.637
B) Peak value × 0.707 (CORRECT ANSWER)
C) Peak-to-peak value × 0.5
D) Average value × 1.11
*Rationale: Vims = Peak / √2 ≈ 0.707 × Vpeak. *
9. What is the primary function of a diode?
A) To amplify signals
B) To store energy
C) To allow current flow in only one direction (CORRECT ANSWER)
D) To vary resistance with temperature
, Rationale: A diode is a unidirectional device, acting as a one-way valve for current.
10. Which logic gate produces a HIGH output only when all inputs are HIGH?
A) OR gate
B) XOR gate
C) NAND gate
D) AND gate (CORRECT ANSWER)
Rationale: The AND gate implements logical conjunction.
11. The power dissipated by a resistor of 100 Ω with a current of 2 A flowing
through it is:
A) 200 W
B) 50 W
C) 400 W
D) 400 W (CORRECT ANSWER)
*Rationale: P = I²R = (2) ² × 100 = 4 × 100 = 400 W.*
12. A transformer works on the principle of:
A) Electrostatic induction
B) Mutual induction (CORRECT ANSWER)
C) Self-induction
D) Piezoelectric effect
Rationale: A changing magnetic field in the primary coil induces a voltage in the
secondary coil.
ENGINEERING (DC/AC CIRCUITS , DIGITAL LOGIC,POWER & SAFETY)
FINAL EXAM 2026/2027 AND STUDY GUIDE ACCURATE APPROVED
QUESTIONS AND CORRECT DETAILED ANSWERS WITH RATIONALES
(100 % CORRECT VERIFIED SOLUTIONS) LATEST UPDATED VERSION
|ALREADY GRADED A+
1. What is the SI unit of electric charge?
A) Ampere
B) Volt
C) Coulomb (CORRECT ANSWER)
D) Ohm
Rationale: The coulomb is defined as the amount of charge transported by a
current of one ampere in one second.
2. Which of the following materials has the highest electrical conductivity?
A) Silicon
B) Silver (CORRECT ANSWER)
C) Aluminum
D) Carbon
Rationale: Silver has the highest conductivity of any metal, though copper is more
commonly used due to cost.
3. According to Ohm’s Law, if the voltage across a resistor is doubled and the
resistance remains constant, the current will:
,A) Remain the same
B) Double (CORRECT ANSWER)
C) Halve
D) Increase by a factor of four
Rationale: I = V/R, so current is directly proportional to voltage.
4. A resistor has color bands: Red, Red, Orange, Gold. What is its nominal value
and tolerance?
A) 22 Ki, ±10%
B) 2.2 Ki, ±5%
C) 22 Ki, ±5% (CORRECT ANSWER)
D) 220 Ω, ±5%
*Rationale: Red=2, Red=2, Orange=×1,000 = 22,000 Ω or 22 Ki. Gold = ±5%. *
5. Which theorem states that any linear bilateral network can be replaced by a
single voltage source in series with a single impedance?
A) Norton’s Theorem
B) Superposition Theorem
C) The venin’s Theorem (CORRECT ANSWER)
D) Maximum Power Transfer Theorem
Rationale: The venin’s theorem simplifies a circuit to a voltage source (Vth) in
series with a resistor (Roth).
6. In a purely resistive AC circuit, the voltage and current are:
A) 90° out of phase
,B) 180° out of phase
C) In phase (CORRECT ANSWER)
D) 45° out of phase
Rationale: With no reactance, the current rises and falls simultaneously with
voltage.
7. What is the total capacitance of two 10 µF capacitors connected in series?
A) 20 µF
B) 10 µF
C) 5 µF (CORRECT ANSWER)
D) 0.2 µF
*Rationale: For series capacitors, 1/Total = 1/10 + 1/10 = 2/10, so Total = 5 µF. *
8. The RMS value of a sinusoidal AC voltage is equal to:
A) Peak value × 0.637
B) Peak value × 0.707 (CORRECT ANSWER)
C) Peak-to-peak value × 0.5
D) Average value × 1.11
*Rationale: Vims = Peak / √2 ≈ 0.707 × Vpeak. *
9. What is the primary function of a diode?
A) To amplify signals
B) To store energy
C) To allow current flow in only one direction (CORRECT ANSWER)
D) To vary resistance with temperature
, Rationale: A diode is a unidirectional device, acting as a one-way valve for current.
10. Which logic gate produces a HIGH output only when all inputs are HIGH?
A) OR gate
B) XOR gate
C) NAND gate
D) AND gate (CORRECT ANSWER)
Rationale: The AND gate implements logical conjunction.
11. The power dissipated by a resistor of 100 Ω with a current of 2 A flowing
through it is:
A) 200 W
B) 50 W
C) 400 W
D) 400 W (CORRECT ANSWER)
*Rationale: P = I²R = (2) ² × 100 = 4 × 100 = 400 W.*
12. A transformer works on the principle of:
A) Electrostatic induction
B) Mutual induction (CORRECT ANSWER)
C) Self-induction
D) Piezoelectric effect
Rationale: A changing magnetic field in the primary coil induces a voltage in the
secondary coil.
