15/08/2026
Advanced Electricity Quiz (10 Questions)
1. Which Maxwell equation predicts electromagnetic waves can propagate through a vacuum?
A. Ampère-Maxwell law
B. Gauss's law for electricity
C. Gauss's law for magnetism
D. Coulomb's law
2. In a balanced three-phase system, what is the line voltage in terms of phase voltage for a star (Y) connection?
A. VL = 3VP
B. VL = VP
C. VL = VP/√3
D. VL = √3 VP
3. At resonance in a parallel RLC circuit, the input current is:
A. Minimum
B. Maximum
C. Infinite
D. Zero
4. The Hall effect is primarily used to determine a semiconductor's:
A. Band gap
B. Dielectric constant
C. Majority carrier type
D. Breakdown voltage
5. The intrinsic impedance of free space is approximately:
A. 50 Ω
B. 1 Ω
C. 1000 Ω
D. 120π Ω
6. A transformer cannot operate with a pure DC supply because:
A. Copper has zero resistance
B. No changing magnetic flux is produced
C. The core becomes superconducting
D. The frequency becomes infinite
7. Which semiconductor device is commonly used for high-speed switching in switched-mode power supplies?
A. MOSFET
B. Zener diode
C. Photodiode
D. Varistor
8. The Poynting vector represents:
A. Electric potential
B. Electromagnetic energy flow per unit area
C. Magnetic flux
D. Electric charge density
9. Which fault current is generally the largest in a power system?
A. Line-to-line fault
B. Three-phase symmetrical fault
C. Double line-to-ground fault
D. Single line-to-ground fault
10. In an ideal transmission line, the reflection coefficient is zero when:
A. The load is open-circuited
B. Load impedance equals characteristic impedance
C. The load is short-circuited
D. The frequency is zero
