1. Which is NOT TRUE for Closed-loop systems?
• They are less sensitive to disturbances
• They are stable in nature  
• They have reduced effect of non-linearities and distortions
• They are highly accurate and reliable
2. Consider :
                   O: Open loop systems
                   C: Closed-loop systems.

           Which is NOT TRUE statement?

• C require output measurement but O don’t.
• Feedback element and error detector are present in C and absent in O.
• C are complex but cheap while corresponding O are simple but expensive.
• C are higher in cost and power than corresponding O are.
1. The input to a controller in a closed loop system is
• Sensed signal.
• Desired variable value.
• Error signal.
• Servo-signal.
2. _________is the process by which a system’s performance is determined.
• Analysis
• Design
• Testing
• Trouble shooting
3.  _________is the process by which a system’s performance is created or changed.
• Analysis
• Design
• Testing
• Trouble shooting
4. Control systems analysis-and-design focuses on:
• Achieving stability
• Reducing steady-state errors
• Producing the desired transient response
• All of the above three primary objectives.
5. A __________ analysis can yield the percentage of change in a specification as a function of a change in a system parameter.
• Transient
• Stability
• Sensitivity
• Steady State

8. Desirable properties of feedback control systems are
   • stability
   • accuracy
   • speed (short settling time)
   • small overshoot
   • all

1. Sensitivity is dependent upon changes in parameters. Consider for a closed loop system
                   B:FeedBack path parameter changes
                   F:FeedForward path parameter changes

           Closed loop systems are

• Insensitive to both B and F.
• Less sensitive to B than to F.
• Less sensitive to F than to B.
• Equally sensitive to B and F.
1. Which of the following is not open loop system?
• low pass filter
• motor
• resistor
• toasters
• none