If the Nyquist plot of the loop transfer function G (s)H (s) of a closed-loop system encloses the (1, j0) point in the G (s)H (s) plane, the gain margin of the system is
A. Zero
B. Greater than zero
C. Less than zero
D. Infinity
Answer:C
If the Nyquist plot of the loop transfer function G (s)H (s) of a closed-loop system encloses the (1, j0) point in the G (s)H (s) plane, the gain margin of the system is
A. Zero B. Greater than zero C. Less than zero D. Infinity
Explanation: Nyquist plot deals with the open loop poles and zero and equals the encirclements to the open loop poles of the system.