Question
A lead compensating network :
A. Improves response time
B. Stabilizes the system with low phase margin
C. Enables moderate increase in gain without affecting stability
D. Increases the resonant frequency
E. Decreases the resonant frequency
Choose the correct answer from the options given below :
This question was previously asked in
CUET PG 2026 Agri-Business Management Question Paper (25-Mar-2026) (Shift 2)
The correct answer is
A, B, C, D only
Lead Compensating Network Effects Analysis
A lead compensating network is primarily used in control systems to improve performance characteristics. Let's analyze the given statements:
- A. Improves response time: Lead compensators increase the system's bandwidth. A wider bandwidth generally results in a faster transient response, meaning the system reacts more quickly. Thus, statement A is correct.
- B. Stabilizes the system with low phase margin: The main function of a lead compensator is to introduce a phase lead, especially near the gain crossover frequency. This increases the phase margin, thereby improving the system's stability. It is particularly effective for systems that start with a low phase margin. Thus, statement B is correct.
- C. Enables moderate increase in gain without affecting stability: By enhancing the phase margin, the lead compensator provides stability margins that can accommodate a moderate increase in system gain or allow operation at higher frequencies without compromising the improved stability. Thus, statement C is correct.
- D. Increases the resonant frequency: Lead compensation increases the system's bandwidth. This increase in bandwidth often shifts the resonant peak to a higher frequency, increasing the resonant frequency ($\omega_r$). Thus, statement D is correct.
- E. Decreases the resonant frequency: This statement is the opposite of the effect described in D and is incorrect.
Based on the analysis, statements A, B, C, and D accurately describe the effects of a lead compensating network.
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