Control System Engineering Set 8

Electrical Engineering

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This set of Control System Engineering (CSE) Multiple Choice Questions & Answers (MCQs) focuses on Control System Engineering Set 8

Q1 | Pure imaginary pair:
  • centre
  • focus point
  • saddle point
  • stable node
Answer: centre
Explaination:
pure imaginary pair is the nature of the root of the equation that has no real part only has the nature of center for linearized autonomous second order system.
Q2 | Real and equal but with opposite sign.
  • center
  • focus point
  • saddle point
  • stable node
Answer: saddle point
Explaination:
saddle point are real and equal with opposite sign and these points are called the saddle point as the points are different with real and equal with opposite sign.
Q3 | Real distinct and negative.
  • center
  • focus point
  • saddle point
  • stable node
Answer: stable node
Explaination:
stable node is real distinct and negative and this node is stable as the points or roots are real and neative lying on the left side of the plane.
Q4 | Stability of a system implies that :
  • small changes in the system input does not result in large change in system output
  • small changes in the system parameters does not result in large change in system output
  • small changes in the initial conditions does not result in large change in system output
  • all of the above mentioned
Answer: all of the above mentioned
Explaination:
stability of the system implies that small changes in the system input, initial conditions, and system parameters does not result in large change in system output.
Q5 | Linear mathematical model applies to :
  • linear systems
  • stable systems
  • unstable systems
  • non-linear systems
Answer: stable systems
Explaination:
as the output exceeds certain
Q6 | If the roots of the have negative real parts then the response is                          
  • stable
  • unstable
  • marginally stable
  • bounded
Answer: bounded
Explaination:
if the roots of the have negative real parts then the response is bounded and eventually decreases to zero.
Q7 | Which among the following is a unique model of a system?
  • transfer function
  • state variable
  • block diagram
  • signal flow graphs
Answer: transfer function
Explaination:
transfer function is defined as the ratio of the laplace output to the laplace input with the zero initial conditions and is a unique model of the system.
Q8 | According to the property of state transition method, e0 is equal to            
  • i
  • a
  • e-at
  • -eat
Answer: e-at
Explaination:
by definition state transition matrix is defined as e-at and this is the matrix that comes into the picture when the total response is considered that is with the free response and forced response.
Q9 | Which mechanism in control engineering implies an ability to measure the state by taking measurements at output?
  • controllability
  • observability
  • differentiability
  • adaptability
Answer: observability
Explaination:
observability and controllability are the two methods to check the output response characteristics and observability in control engineering implies an ability to measure the state by taking measurements at output.
Q10 | State model representation is possible using                    
  • physical variables
  • phase variables
  • canonical state variables
  • all of the mentioned
Answer: all of the mentioned
Explaination:
state model representation is the representation of the control system is the form of the state variables and state vectors
Q11 | Which among the following constitute the state model of a system in addition to state equations?
  • input equations
  • output equations
  • state trajectory
  • state vector
Answer: output equations
Explaination:
output equations constitute the state model of a system in addition to state equations and for the complete state model mainly input model, output model and state models are required.
Q12 | Which among the following plays a crucial role in determining the state of dynamic system?
  • state variables
  • state vector
  • state space
  • state scalar
Answer: state variables
Explaination:
state variables are the integral part of the state variable analysis and plays a crucial role in determining the state of dynamic system.
Q13 | Which among the following are the interconnected units of state diagram representation?
  • scalars
  • adders
  • integrator
  • all of the mentioned
Answer: all of the mentioned
Explaination:
scalars, adders and integrator are the interconnected units of state diagram representation and this representation helps in determination of the state of the control system.
Q14 | State space analysis is applicable even if the initial conditions are            
  • zero
  • non-zero
  • equal
  • not equal
Answer: non-zero
Explaination:
state space analysis is the analysis different from the transfer function approach as it has state variables and state vectors used for the analysis and can be used even if initial conditions are non-zero.
Q15 | Conventional control theory is applicable to              systems
  • siso
  • mimo
  • time varying
  • non-linear
Answer: siso
Explaination:
the major advantage of state space analysis is that it can be applied to mimo systems also while the conventional control theory that is transfer function approach is applicable to the siso systems only.
Q16 | Which of the following are the not characteristics of the closed loop systems?
  • it does not compensate for disturbance
  • it reduces the sensitivity of plant-parameter variations
  • it does not involve output measurements
  • it does not has the ability to control the system transient response
Answer: it does not has the ability to control the system transient response
Explaination:
feedback refers to the comparison of the final output to the desired output at respective input so as to get accurate
Q17 | Which of the following will not decrease as a result of introduction of negative feedback?
  • instability
  • bandwidth
  • overall gain
  • distortion
Answer: bandwidth
Explaination:
bandwidth always increases
Q18 | Insertion of negative feedback in control system affects:
  • the transient response to vanish uniformly
  • the transient response to decay very fast
  • no change in transient response
  • the transient response decays at slow rate
Answer: the transient response to decay very fast
Explaination:
feedback can be positive or negative but practically positive feedback is not used as it causes oscillations in the system with more gain and hence negative feedback is use which causes speed of response to increase.
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