A system is said to be ______, if its output is under control

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  1. Unstable 
  2. Stable 
  3. Constant  
  4. Flexible 

Answer (Detailed Solution Below)

Option 2 : Stable 
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Stable System

A system is said to be stable if its output is under control.

 A stable system produces a bounded output for a given bounded input.

The output of a stable system must have a constant or zero value at 't' tends to ∞.

The following figure shows the response of a stable system.

Unstable System

An unstable system produces an unbounded output for a given bounded input.

The output of an unstable system has an infinite value at 't' tends to ∞.

The following figure shows the response of an unstable system.
F4 Savita Engineering 18-7-22 D21

 

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