Control Systems (book reference)
1. What are the two main types of control systems?: Open-loop control system and
Closed-loop control system.
2. How does an open-loop control system operate?: The control action is independent of the
output.
3. What is a closed-loop control system also known as?: Feedback control system.
4. What is the reference input in a control system?: The actual signal input to the control
system that represents the desired output.
5. What is the actuating error signal?: The ditterence between the reference input and the feedback
signal.
6. What is the role of a controller in a control system?: To generate a control signal to drive
the actuator.
7. What does the term 'plant' refer to in control systems?: The combination of the object
to be controlled and the actuator.
8. What are the features of closed-loop systems?: Reduced ettect of nonlinearities, increased
accuracy, increased bandwidth, less sensitivity to variations, tendency towards oscillations, and reduced ettects of
disturbances.
9. What is a servomechanism?: A feedback control system where the output is mechanical position,
velocity, or acceleration.
10. What is the purpose of a feedback element in a control system?: To provide a
means for feeding back the output quantity to compare it with the reference input.
11. What is the significance of disturbance inputs in an open-loop system?: They
are undesirable inputs that can deflect the plant outputs from their desired values.
What does SFG stand for in control systems?: Signal Flow Graph.
12.
13. What does a node represent in a signal flow graph?: A system variable whose value
equals the sum of all incoming signals at that node.
14. What is a forward path in a signal flow graph?: A path from the input no de to the output
node.
15. What is Mason's Gain Formula used for?: To write the overall transfer function of a system
through inspection of the signal flow graph.
, 16. What are standard test signals used in time response analysis?: Impulse, step,
ramp, and parabolic signals.
17. What are the two components of the time response of a system?: Transient
response and steady-state response.
18. What is the transient response of a system dependent on?: The system poles only.
19. What does the steady-state response depend on?: System dynamics and the input
quantity.
20. What is the purpose of the final value theorem in control systems?: To examine
the steady-state response using ditterent test signals.
21. What is the role of an actuator in a control system?: To produce input to the plant
according to the control signal.
22. What is a self-loop in a signal flow graph?: A loop containing one branch.
23. What is the difference between touching and non-touching loops?: Touching
loops share a common node, while non-touching loops do not.
24. What is the significance of gain in a signal flow graph?: It represents the transmittance
of a branch.
25. What is the purpose of block diagram algebra?: To simplify complex systems represented
by interconnected blocks.
26. What is the output of a control system?: The actual response obtained from the control system.
27. What is the relationship between input and output in a closed-loop system?-
: The output is compared with the input to form appropriate control actions.
28. What is the time constant of a motor responsible for?: It is responsible for the speed
of response.
29. How long does it take for a motor to reach within 1% of its final speed?: 5
time constants.
30. What is the effect of feedback on the time constant and motor gain con-
stant?: The time constant is reduced by a factor, but the motor gain constant is also reduced by the same factor.
31. What is the steady-state error for a first-order system tracking a unit ramp
input?: The steady-state error is equal to the time-constant of the system.
1. What are the two main types of control systems?: Open-loop control system and
Closed-loop control system.
2. How does an open-loop control system operate?: The control action is independent of the
output.
3. What is a closed-loop control system also known as?: Feedback control system.
4. What is the reference input in a control system?: The actual signal input to the control
system that represents the desired output.
5. What is the actuating error signal?: The ditterence between the reference input and the feedback
signal.
6. What is the role of a controller in a control system?: To generate a control signal to drive
the actuator.
7. What does the term 'plant' refer to in control systems?: The combination of the object
to be controlled and the actuator.
8. What are the features of closed-loop systems?: Reduced ettect of nonlinearities, increased
accuracy, increased bandwidth, less sensitivity to variations, tendency towards oscillations, and reduced ettects of
disturbances.
9. What is a servomechanism?: A feedback control system where the output is mechanical position,
velocity, or acceleration.
10. What is the purpose of a feedback element in a control system?: To provide a
means for feeding back the output quantity to compare it with the reference input.
11. What is the significance of disturbance inputs in an open-loop system?: They
are undesirable inputs that can deflect the plant outputs from their desired values.
What does SFG stand for in control systems?: Signal Flow Graph.
12.
13. What does a node represent in a signal flow graph?: A system variable whose value
equals the sum of all incoming signals at that node.
14. What is a forward path in a signal flow graph?: A path from the input no de to the output
node.
15. What is Mason's Gain Formula used for?: To write the overall transfer function of a system
through inspection of the signal flow graph.
, 16. What are standard test signals used in time response analysis?: Impulse, step,
ramp, and parabolic signals.
17. What are the two components of the time response of a system?: Transient
response and steady-state response.
18. What is the transient response of a system dependent on?: The system poles only.
19. What does the steady-state response depend on?: System dynamics and the input
quantity.
20. What is the purpose of the final value theorem in control systems?: To examine
the steady-state response using ditterent test signals.
21. What is the role of an actuator in a control system?: To produce input to the plant
according to the control signal.
22. What is a self-loop in a signal flow graph?: A loop containing one branch.
23. What is the difference between touching and non-touching loops?: Touching
loops share a common node, while non-touching loops do not.
24. What is the significance of gain in a signal flow graph?: It represents the transmittance
of a branch.
25. What is the purpose of block diagram algebra?: To simplify complex systems represented
by interconnected blocks.
26. What is the output of a control system?: The actual response obtained from the control system.
27. What is the relationship between input and output in a closed-loop system?-
: The output is compared with the input to form appropriate control actions.
28. What is the time constant of a motor responsible for?: It is responsible for the speed
of response.
29. How long does it take for a motor to reach within 1% of its final speed?: 5
time constants.
30. What is the effect of feedback on the time constant and motor gain con-
stant?: The time constant is reduced by a factor, but the motor gain constant is also reduced by the same factor.
31. What is the steady-state error for a first-order system tracking a unit ramp
input?: The steady-state error is equal to the time-constant of the system.
