CONTROL SYSTEM MCQs SET 26
1. An underdamped second order system with negative damping will have the roots :
a) On the negative real axis as roots
b) On the left hand side of complex plane as complex roots
c) On the right hand side of complex plane as complex conjugates
d) On the positive real axis as real roots
a) On the negative real axis as roots
b) On the left hand side of complex plane as complex roots
c) On the right hand side of complex plane as complex conjugates
d) On the positive real axis as real roots
Answer: c
2. Given a unity feedback system with G (s) =K/ s (s+4). What is the value of K for a damping ratio of 0.5?
a) 1
b) 16
c) 4
d) 2
2. Given a unity feedback system with G (s) =K/ s (s+4). What is the value of K for a damping ratio of 0.5?
a) 1
b) 16
c) 4
d) 2
Answer: b
3. How can the steady state error can be reduced?
a) By decreasing the type of the system
b) By increasing system gain
c) By decreasing the static error constant
d) By increasing the input
a) By decreasing the type of the system
b) By increasing system gain
c) By decreasing the static error constant
d) By increasing the input
Answer: d
4. Which one of the following statements is not correct?
a) Root loci can be used for analyzing stability and transient performance
b) Root loci provide insight into system stability and performance
c) Shape of the root locus gives idea of type of controller needed to meet design specification
d) Root locus can be used to handle more than one variable at a time
4. Which one of the following statements is not correct?
a) Root loci can be used for analyzing stability and transient performance
b) Root loci provide insight into system stability and performance
c) Shape of the root locus gives idea of type of controller needed to meet design specification
d) Root locus can be used to handle more than one variable at a time
Answer: d
5. Root locus of s(s+2)+K(s+4) =0 is a circle. What are the coordinates of the center of this circle?
a) -2,0
b) -3,0
c) -4,0
d) -5,0
5. Root locus of s(s+2)+K(s+4) =0 is a circle. What are the coordinates of the center of this circle?
a) -2,0
b) -3,0
c) -4,0
d) -5,0
Answer: c
6. The main objective of drawing root locus plot is :
a) To obtain a clear picture about the open loop poles and zeroes of the system
b) To obtain a clear picture about the transient response of feedback system for various values of open loop gain K
c) To determine sufficient condition for the value of ‘K’ that will make the feedback system unstable
d) Both b and c
6. The main objective of drawing root locus plot is :
a) To obtain a clear picture about the open loop poles and zeroes of the system
b) To obtain a clear picture about the transient response of feedback system for various values of open loop gain K
c) To determine sufficient condition for the value of ‘K’ that will make the feedback system unstable
d) Both b and c
Answer: d
7. While increasing the value of gain K, the system becomes
a) Less stable
b) More stable
c) Unstable
d) Absolute stable
7. While increasing the value of gain K, the system becomes
a) Less stable
b) More stable
c) Unstable
d) Absolute stable
Answer: a
8. The addition of open loop poles pulls the root locus towards:
a) The right and system becomes unstable
b) Imaginary axis and system becomes marginally stable
c) The left and system becomes unstable
d) The right and system becomes unstable
8. The addition of open loop poles pulls the root locus towards:
a) The right and system becomes unstable
b) Imaginary axis and system becomes marginally stable
c) The left and system becomes unstable
d) The right and system becomes unstable
Answer: d
9. Root locus is used to calculate:
a) Marginal stability
b) Absolute stability
c) Conditional stability
d) Relative stability
9. Root locus is used to calculate:
a) Marginal stability
b) Absolute stability
c) Conditional stability
d) Relative stability
Answer: d
10. Routh Hurwitz criterion is better than root locus.
a) True
b) False
10. Routh Hurwitz criterion is better than root locus.
a) True
b) False
Answer: b
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