Question 11 : Which one of the following statements is not correct?
1. Root loci can be used for analyzing stability and transient performance
2. Root loci provide insight into system stability and performance
3. Shape of the root locus gives idea of type of controller needed to meet design specification
4. Root locus can be used to handle more than one variable at a time
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Question 12 : " Which one of the following is not the property of root loci?"
1. " The root locus is symmetrical about imaginary axis"
2. " They start from the open loop poles and terminate at the open loop zeroes"
3. " The breakaway points are determined from dK/ds = 0"
4. " Segments of the real axis are the part of the root locus if and only is the total number of real poles and zeroes to their right is odd."
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Question 13 : The main objective of drawing root locus plot is :
1. To obtain a clear picture about the open loop poles and zeroes of the system
2. To obtain a clear picture about the transient response of feedback system for various values of open loop gain K
3. To determine sufficient condition for the value of 'K' that will make the feedback system unstable
4. Both b and c
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Question 14 : The addition of open loop poles pulls the root locus towards:
1. The right and system becomes unstable
2. Imaginary axis and system becomes marginally stable
3. The left and system becomes unstable
4. The right and system becomes unstable
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Question 15 : " If root loci plots of a particular control system do not intersect the imaginary axis at any point, then the gain margin of the system will be:"
1. " 0"
2. " 0.707"
3. " 1"
4. " Infinite"
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Question 16 : Root locus is used to calculate:
1. Marginal stability
2. Absolute stability
3. Conditional stability
4. Relative stability
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Question 17 : Root locus of s(s+2)+K(s+4) =0 is a circle. What are the coordinates of the center of this circle?
1. -2,0
2. -3,0
3. -4,0
4. -5,0
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Question 18 : Routh Hurwitz criterion is better than root locus.
1. True
2. False
3.
4.
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Question 19 : Which of the following statements are correct?
1. Root locus is for the negative feedback systems
2. Complementary root locus is for the positive feedback systems
3. Root locus is for the negative feedback and Complementary root locus is for the positive feedback systems
4. Complementary root locus is for the negative feedback systems
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Question 20 : Number of roots of characteristic equation is equal to the number of ______________
1. Branches
2. Root
3. Stem
4. Poles
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