Control System Engineering Set 5

Electrical Engineering

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This set of Control System Engineering (CSE) Multiple Choice Questions & Answers (MCQs) focuses on Control System Engineering Set 5

Q1 | In polar plots, what does each and every point represent w.r.t magnitude and angle?
  • scalar
  • vector
  • phasor
  • differentiator
Answer: phasor
Explaination:
each and every point on the
Q2 | A system has poles at 0.01 Hz, 1 Hz and 80Hz, zeroes at 5Hz, 100Hz and 200Hz. The approximate phase of the system response at 20 Hz is :
  • -90°
  • 0° c) 90°
  • d) -180°
Answer: -90°
Explaination:
pole at 0.01 hz gives -180° phase. zero at 5hz gives 90° phase therefore at 20hz -90° phase shift is provided.
Q3 | The constant M-circle represented by the equation x^2+2.25x+y^2=-1.25 has the value of M equal to:
  • 1
  • 2
  • 3
  • 4
Answer: 3
Explaination:
comparing with the m circle equation we have the value of m =3.
Q4 | What is the value of M for the constant M circle represented by the equation 8x2+18x+8y2+9=0?
  • 0.5
  • 2
  • 3
  • 8
Answer: 3
Explaination:
comparing with the m circle equation we have the value of m =3.
Q5 | The constant N loci represented by the equation x^2+x+y^2=0 is for the value of phase angle equal to:
  • -45°
  • 0°
  • 45°
  • 90°
Answer: 90°
Explaination:
centre = (-0.5, 0) centre of n circle is (-1/2, 1/2n)
Q6 | 4 DESIGN OF COMPENSATORS USING BODE PLOT
  • -1 and origin
  • origin and +1 c) -0.5 and 0.5
  • d) -1 and +1
Answer: -1 and origin
Explaination:
centre of n circle is (-1/2, 1/2n)
Q7 | Which one of the following statements is correct? Nichol’s chart is useful for the detailed study analysis of:
  • closed loop frequency response
  • open loop frequency response
  • close loop and open loop frequency responses
  • none of the above
Answer: closed loop frequency response
Explaination:
nichol’s chart is useful for the detailed study analysis of closed loop frequency response.
Q8 | Frequency range of bode magnitude and phases are decided by :
  • the lowest and higher important frequencies of dominant factors of the oltf
  • the lowest and highest important frequencies of all the factors of the open loop transfer function
  • resonant frequencies of the second factors
  • none of the above
Answer: none of the above
Explaination:
t. f. = kp (1+tds)
Q9 | OLTF contains one zero in right half of s- plane then
  • open loop system is unstable
  • close loop system is unstable
  • close loop system is unstable for higher gain
  • close loop system is stable
Answer: close loop system is unstable for higher gain
Explaination:
oltf contains one zero in right half of s-plane then close loop system is unstable for higher gain.
Q10 | The critical value of gain for a system is 40 and gain margin is 6dB. The system is operating at a gain of:
  • 20
  • 40
  • 80 d) 120
Answer: 20
Explaination:
gm (db) = 20loggm gm =2
Q11 | Nichol’s chart is useful for the detailed study and analysis of:
  • closed loop frequency response
  • open loop frequency response
  • close loop and open loop frequency responses
  • open loop and close loop frequency responses
Answer: closed loop frequency response
Explaination:
nichol’s chart is useful for the detailed study and analysis of closed loop frequency response.
Q12 | The roots of the characteristic equation of the second order system in which real and imaginary part represents the :
  • damped frequency and damping
  • damping and damped frequency
  • natural frequency and damping ratio
  • damping ratio and natural frequency
Answer: damping and damped frequency
Explaination:
real part represents the damping and imaginary part damped frequency.
Q13 | An all-pass network imparts only
  • negative phase to the input
  • positive phase to the input
  • 90 degree phase shift to the input
  • 180 degree phase shift to the input
Answer: 180 degree phase shift to the input
Explaination:
an all-pass network is the network that is the combination of the minimum and non-minimum phase systems and have the magnitude 1 for all frequencies and imparts only 180 degree phase shift.
Q14 | Which of the following is an effect of lag compensation?
  • decrease bandwidth
  • improves transient response
  • increases the effect of noise
  • increases stability margin
Answer: decrease bandwidth
Explaination:
lag compensation is the integral compensation that introduces the lag in the response by slowing the response and reducing the steady state error value by decreasing bandwidth.
Q15 | PD controller:
  • decreases steady state error and improves stability
  • rise time decreases
  • transient response becomes poorer
  • increases steady state error
Answer: rise time decreases
Explaination:
in proportional and derivative
Q16 | PID controller:
  • decreases steady state error and improves stability
  • rise time decreases
  • transient response becomes poorer
  • increases steady state error
Answer: decreases steady state error and improves stability
Explaination:
proportional integral and derivative controller is the controller that is the combinational controller that increases the speed of response, decreases steady state error and improves stability.
Q17 | PI controller:
  • decreases steady state error and improves stability
  • rise time decreases
  • transient response becomes poorer
  • increases steady state error
Answer: transient response becomes poorer
Explaination:
in proportional and integral controller which is the extension of the integral controller which improves the steady state response but transient response becomes poorer.
Q18 | Proportional controller
  • decreases steady state error and improves stability
  • rise time decreases
  • transient response becomes poorer
  • increases steady state error
Answer: increases steady state error
Explaination:
proportional controller is the controller that is used in the system so that the output follows the input and increases steady state error.
Q19 | Lead compensator increases bandwidth
  • true
  • false
Answer: true
Explaination:
lead compensator is similar to high pass filter and causes lead in the system and increases the speed of response of the system and hence increases bandwidth.
Q20 | Lag compensator reduces                     
  • position constant
  • velocity constant
  • position variable
  • acceleration constant
Answer: velocity constant
Explaination:
lag compensator is the integral compensation that causes the lag in the response and reduces velocity constant.
Q21 | A linear time invariant system is stable if :
  • system in excited by the bounded input, the output is also bounded
  • in the absence of input output tends zero
  • both a and b
  • system in excited by the bounded input, the output is not bounded
Answer: both a and b
Explaination:
a system is stable only if it is bibo stable and asymptotic stable.
Q22 | Asymptotic stability is concerned with:
  • a system under influence of input
  • a system not under influence of input
  • a system under influence of output
  • a system not under influence of output
Answer: a system not under influence of input
Explaination:
asymptotic stability concerns a free system relative to its transient behavior.
Q23 | Bounded input and Bounded output stability notion concerns with :
  • a system under influence of input
  • a system not under influence of input
  • a system under influence of output
  • a system not under influence of output
Answer: a system under influence of input
Explaination:
bibo stability concerns with the system that has input present.
Q24 | If a system is given unbounded input then the system is:
  • stable
  • unstable
  • not defined
  • linear
Answer: not defined
Explaination:
if the system is given with the unbounded input then nothing can be clarified for the stability of the system.
Q25 | Linear mathematical model applies to :
  • linear systems
  • stable systems
  • unstable systems
  • non-linear systems
Answer: stable systems
Explaination:
as the output exceeds certain magnitude then the linear mathematical model no longer applies.
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