Electrical Level 2 Module 1 Alternating Current Questions and Answers | Latest Version | 2024/2025 | Correct & Verified

Electrical Level 2 Module 1 Alternating Current Questions and Answers | Latest Version | 2024/2025 | Correct & Verified What is the role of the rotor in an AC generator? The rotor is the rotating component that creates a magnetic field, inducing current in the stator. Why is AC preferred for transmitting electricity over long distances? AC is preferred because its voltage can be stepped up or down using transformers, reducing energy losses during transmission. What is the significance of 120-degree phase separation in a three-phase system? The 120-degree phase separation ensures a constant power delivery and reduces vibration in equipment. What happens when a capacitor and an inductor are connected in series in an AC circuit? They create a resonant circuit where the inductive and capacitive reactances cancel each other out. 2 What does a lagging current indicate in an AC circuit? A lagging current indicates that the current is behind the voltage, typically due to inductive loads. How is the peak-to-peak voltage of an AC waveform calculated? The peak-to-peak voltage is calculated by doubling the peak voltage. What is the role of the stator in an AC generator? The stator is the stationary part of the generator where the induced current flows in its windings. What happens to the inductive reactance of a circuit if the frequency of the AC supply is doubled? The inductive reactance also doubles because it is directly proportional to the frequency. What type of power is measured in volt-amperes (VA)? Apparent power in an AC circuit is measured in volt-amperes. 3 What does the term "alternation" refer to in AC? An alternation refers to one-half of a complete cycle of an AC waveform. What is the purpose of an isolation transformer? An isolation transformer separates two circuits electrically to protect equipment and workers from electrical shocks. What is the formula for calculating impedance in a series AC circuit? Impedance is calculated as the square root of the sum of the resistance squared and the reactance squared. How does a higher frequency affect the skin effect in AC conductors? A higher frequency increases the skin effect, causing the current to flow more on the surface of the conductor. What is the effect of an unbalanced load in a three-phase system? An unbalanced load causes uneven current flow, leading to inefficiency and potential damage to the system.