Electrical Engineering XYZ MCQs
In power system network the load is increasing, it represents the value of impedance:
- Increase
- Remains constant
- Decrease
- None of above
Correct answer: 3. Decrease
Explanation: When the load in a power system network increases, it generally leads to a decrease in the impedance. Impedance is the total opposition that a circuit presents to the flow of alternating current (AC). In power systems, the impedance consists of both resistance and reactance.
As the load increases, more current is drawn from the system. This increased current flow results in a higher voltage drop across the impedance of the transmission and distribution lines. According to Ohm’s Law (V = I * Z), where V is voltage, I is current, and Z is impedance, an increase in current (I) will lead to an increase in the voltage drop across the impedance (Z). Since the voltage drop is proportional to the current and impedance, an increase in load corresponds to a decrease in effective impedance.