Stability 0430

Calculate the DC-gain of the system described by the transfer function w(s)=(5)/(10+s)

• 5

• 10

• 0.1

• 0.5

A phase margin of a control system is -45 degree. Is the closed loop system stable?

• Yes

• No

• Cannot be decided based on this information.

• The system is on the limit of stability, that's why it cannot be decided.

The phase shift of an open loop system is -150 degrees. Is the closed loop system stable?

• Yes

• No

• Cannot be decided based on this information

• Cannot be decided because the system is on the limit of stability.

The zeros of a closed loop system are -5 and +10. Is the system stable?

• Yes

• No

• Cannot be decided based on the given information.

• Cannot be decided because the system is on the limit of stability.

Calculate the absolute value of the static error of a pure negative feedback loop system, supposing that the DC-gain of the open loop system is k=9.

• 9

• 0.9

• 0.99

• 0.86