Control Systems MCQ Questions & Answers

21.
From the figure shown below, the Transfer function of the signal flow graph is:

A. $$\frac{{{{\text{T}}_{12}}}}{{1 - {{\text{T}}_{22}}}}$$

B. $$\frac{{{{\text{T}}_{22}}}}{{1 - {{\text{T}}_{12}}}}$$

C. $$\frac{{{{\text{T}}_{12}}}}{{1 + {{\text{T}}_{22}}}}$$

D. $$\frac{{{{\text{T}}_{22}}}}{{1 + {{\text{T}}_{12}}}}$$

Answer & Solution Discuss in Board Save for Later

22.
In a closed loop system for which the output is the speed of a motor, the output rate control can be used to:

A. Limit the speed of the motor

B. Limit the torque output of the motor

C. Reduce the damping of the system

D. Limit the acceleration of the motor

Answer & Solution Discuss in Board Save for Later

23.
The following quantities give a measure of the transient characteristics of a control system, when subjected to unit step excitation:
1. Maximum overshoot
2. Maximum undershoot
3. Overall gain
4. Delay time
5. Rise time
6. Fall time

A. 1, 3 and 5

B. 2, 4 and 5

C. 2, 4 and 6

D. 1, 4 and 5

Answer & Solution Discuss in Board Save for Later

24.
For the given circuit, which one of the following is the correct state equation?

A. \[\frac{d}{{dt}}\left[ \begin{array}{l} v\\ i \end{array} \right] = \left[ {\begin{array}{*{20}{c}} { - 4}&4\\ { - 2}&{ - 4} \end{array}} \right]\left[ \begin{array}{l} v\\ i \end{array} \right] + \left[ {\begin{array}{*{20}{c}} 0&4\\ 4&0 \end{array}} \right]\left[ \begin{array}{l} {i_1}\\ {i_2} \end{array} \right]\]

B. \[\frac{d}{{dt}}\left[ \begin{array}{l} v\\ i \end{array} \right] = \left[ {\begin{array}{*{20}{c}} { - 4}&{ - 4}\\ { - 2}&{ - 4} \end{array}} \right]\left[ \begin{array}{l} v\\ i \end{array} \right] + \left[ {\begin{array}{*{20}{c}} 4&0\\ 0&4 \end{array}} \right]\left[ \begin{array}{l} {i_1}\\ {i_2} \end{array} \right]\]

C. \[\frac{d}{{dt}}\left[ \begin{array}{l} v\\ i \end{array} \right] = \left[ {\begin{array}{*{20}{c}} { - 4}&{ - 4}\\ { - 2}&4 \end{array}} \right]\left[ \begin{array}{l} v\\ i \end{array} \right] + \left[ {\begin{array}{*{20}{c}} 4&4\\ 4&0 \end{array}} \right]\left[ \begin{array}{l} {i_1}\\ {i_2} \end{array} \right]\]

D. \[\frac{d}{{dt}}\left[ \begin{array}{l} v\\ i \end{array} \right] = \left[ {\begin{array}{*{20}{c}} 4&{ - 4}\\ { - 2}&{ - 4} \end{array}} \right]\left[ \begin{array}{l} v\\ i \end{array} \right] + \left[ {\begin{array}{*{20}{c}} 0&4\\ 4&4 \end{array}} \right]\left[ \begin{array}{l} {i_1}\\ {i_2} \end{array} \right]\]

Answer & Solution Discuss in Board Save for Later

25.
What is the value of K for a unity feedback system with $$G\left( s \right) = \frac{K}{{s\left( {1 + s} \right)}}$$ to have a peak overshoot of 50%?

A. 0.53

B. 5.3

C. 0.6

D. 0.047

Answer & Solution Discuss in Board Save for Later

26.
Which of the following components can be used as a rotating amplifier in a control system?
1. An amplidyne
2. A separately excited dc generator
3. A self-excited dc generator
4. A synchro
Select the correct answer using the options given below:

A. 3 and 4

B. 1 and 2

C. 1, 2 and 3

D. 1, 2, 3 and 4

Answer & Solution Discuss in Board Save for Later

27.
For the following feedback system $$G\left( s \right) = \frac{1}{{\left( {s + 1} \right)\left( {s + 2} \right)}}.$$ The 2% settling time of the step response is required to be less than 2 seconds.
Which one of the following compensators C(s) achieves this?

A. $$3\left( {\frac{1}{{s + 5}}} \right)$$

B. $$5\left( {\frac{{0.03}}{s} + 1} \right)$$

C. $$2\left( {s + 4} \right)$$

D. $$4\left( {\frac{{s + 8}}{{s + 3}}} \right)$$

Answer & Solution Discuss in Board Save for Later

28.
The main purpose of feedback in a control system is

A. To have a reduced time constant

B. To make the system more stable

C. To decrease the response error

D. Sensitivity of the system is increased

Answer & Solution Discuss in Board Save for Later

29.
In control systems, we have
1. Nyquist Criterion
2. Bode plot
3. Root locus plot
4. RH-Criterion
Which of the above are in time domain?

A. 1 and 2 only

B. 2 and 4 only

C. 1 and 3 only

D. 3 and 4 only

Answer & Solution Discuss in Board Save for Later

30.
In a feedback control system, phase margin (PM) is:
1. Directly proportional to ξ
2. Inversely proportional to ξ
3. Independent of ξ
4. Zero when ξ = 0
Which of the above statements are correct?

A. 1 and 2

B. 2 and 3

C. 3 and 4

D. 1 and 4

Answer & Solution Discuss in Board Save for Later

Control Systems MCQ Questions & Answers | ECE

21. From the figure shown below, the Transfer function of the signal flow graph is:

Answer & Solution

22. In a closed loop system for which the output is the speed of a motor, the output rate control can be used to:

Answer & Solution

23. The following quantities give a measure of the transient characteristics of a control system, when subjected to unit step excitation: 1. Maximum overshoot 2. Maximum undershoot 3. Overall gain 4. Delay time 5. Rise time 6. Fall time

Answer & Solution

24. For the given circuit, which one of the following is the correct state equation?

Answer & Solution

25. What is the value of K for a unity feedback system with $$G\left( s \right) = \frac{K}{{s\left( {1 + s} \right)}}$$ to have a peak overshoot of 50%?

Answer & Solution

26. Which of the following components can be used as a rotating amplifier in a control system? 1. An amplidyne 2. A separately excited dc generator 3. A self-excited dc generator 4. A synchro Select the correct answer using the options given below:

Answer & Solution

27. For the following feedback system $$G\left( s \right) = \frac{1}{{\left( {s + 1} \right)\left( {s + 2} \right)}}.$$ The 2% settling time of the step response is required to be less than 2 seconds. Which one of the following compensators C(s) achieves this?

Answer & Solution

28. The main purpose of feedback in a control system is

Answer & Solution

29. In control systems, we have 1. Nyquist Criterion 2. Bode plot 3. Root locus plot 4. RH-Criterion Which of the above are in time domain?

Answer & Solution

30. In a feedback control system, phase margin (PM) is: 1. Directly proportional to ξ 2. Inversely proportional to ξ 3. Independent of ξ 4. Zero when ξ = 0 Which of the above statements are correct?

Answer & Solution

Read More Section(Control Systems)

21.
From the figure shown below, the Transfer function of the signal flow graph is:

22.
In a closed loop system for which the output is the speed of a motor, the output rate control can be used to:

23.
The following quantities give a measure of the transient characteristics of a control system, when subjected to unit step excitation:
1. Maximum overshoot
2. Maximum undershoot
3. Overall gain
4. Delay time
5. Rise time
6. Fall time

24.
For the given circuit, which one of the following is the correct state equation?

25.
What is the value of K for a unity feedback system with $$G\left( s \right) = \frac{K}{{s\left( {1 + s} \right)}}$$ to have a peak overshoot of 50%?

26.
Which of the following components can be used as a rotating amplifier in a control system?
1. An amplidyne
2. A separately excited dc generator
3. A self-excited dc generator
4. A synchro
Select the correct answer using the options given below:

27.
For the following feedback system $$G\left( s \right) = \frac{1}{{\left( {s + 1} \right)\left( {s + 2} \right)}}.$$ The 2% settling time of the step response is required to be less than 2 seconds.
Which one of the following compensators C(s) achieves this?

28.
The main purpose of feedback in a control system is

29.
In control systems, we have
1. Nyquist Criterion
2. Bode plot
3. Root locus plot
4. RH-Criterion
Which of the above are in time domain?

30.
In a feedback control system, phase margin (PM) is:
1. Directly proportional to ξ
2. Inversely proportional to ξ
3. Independent of ξ
4. Zero when ξ = 0
Which of the above statements are correct?