Control Systems 6

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Subject: Control Systems 6

Part 6: List for questions and answers of Control Systems


Q1. In p-i controller, what does an integral of a function compute?

a) Density of curve

b) area under the curve

c) Volume over the curve

d) Circumference of curve


Q2. Which controller has the potential to eliminate/overcome the drawback of offset in proportional controllers?

a) p-i

b) P-d

c) Both a and b

d) None of the above


Q3. Which time is responsible for introducing an error in the temperature regulation of applications associated with on-off controllers?

a) Rise time

b) dead time

c) Switching time

d) Decay time


Q4. If an error signal e(t) of an on-off controller is found to be greater than zero, what would be its output?

a) 10%

b) 50%

c) 80%

d) 100%


Q5. State space analysis is applicable even if the initial conditions are _____

a) Zero

b) non-zero

c) Equal

d) Not equal


Q6. Conventional control theory is applicable to ______ systems

a) siso

b) Mimo

c) Time varying

d) Non-linear 


Q7. In polar plots, if a pole is added at the origin, what would be the value of the magnitude at ohm = 0?

a) Zero

b) infinity

c) Unity

d) Unpredictable


Q8. In polar plots, what does each and every point represent w.r.t magnitude and angle?

a) Scalar

b) Vector

c) phasor

d) Differentiator


Q9. In an octave frequency band, the ratio of f2 / f1 is equivalent to ________

a) 2

b) 4

c) 8

d) 10


Q10. Which unit is adopted for magnitude measurement in bode plots?

a) Degree

b) Decimal

c) decibel

d) Deviation


Q11. If a linear system is subjected to an input r(t) = asin(wt), what output will be generated?

a) c(t) = B sin (ω t + F)

b) c(t) = B cos (ω t + F)

c) c(t) = B tan (ω  + F)

d) c(t) = B cot (ω t + F)


Q12. The magnitude & phase relationship between _________input and the steady state output is called as frequency domain

a) Step

b) Ramp

c) sinusoidal

d) Parabolic 


Q13. While specifying the angle and magnitude conditions, angles are added whereas magnitudes get ________

a) Subtracted

b) multiplied

c) Divided

d) All of the above


Q14. Which condition is used to verify the existence of a particular point on the root locus?

a) Amplitude

b) Frequency

c) Magnitude

d) angle


Q15. Root locus specifies the movement of closed loop poles especially when the gain of system ________

a) Remains constant

b) exhibit variations

c) Gives zero feedback

d) Gives infinite poles


Q16. In second order system, which among the following remains independent of gain (k)?

a) open loop poles

b) Closed loop poles

c) Both a and b

d) None of the above


Q17. If a pole is located at s = -5 in left-hand plane (lhp), how will it be represented in laplace domain?

a) 1/ s + 5

b) 1/ s – 5

c) S/ s + 5

d) S/ s – 5


Q18. Which among the following are solely responsible in determining the speed of response of control system?

a) poles

b) Zeros

c) Speed of input

d) All of the above 


Q19. If the complex conjugate poles are located at rhp, what would be the nature of corresponding impulse response?

a) Exponential

b) Damping oscillations

c) increasing amplifier

d) Constant amplitude oscillations


Q20. On the basis of an output response, into how many parts can the s-plane be divided?

a) 2

b) 3

c) 4

d) 6 


Part 6: List for questions and answers of Control Systems


Q1. Answer: b


Q2. Answer: a


Q3. Answer: b


Q4. Answer: d


Q5. Answer: b

Q6. Answer: a


Q7. Answer: b


Q8. Answer: c


Q9. Answer: a


Q10. Answer: c


Q11. Answer: a


Q12. Answer: c


Q13. Answer: b


Q14. Answer: d


Q15. Answer: b


Q16. Answer: a


Q17. Answer: a


Q18. Answer: a


Q19. Answer: c


Q20. Answer: b