CONTROL SYSTEM MCQs SET 28
1. The addition of open loop zero pulls the root loci towards:
a) The left and therefore system becomes more stable
b) The right and therefore system becomes unstable
c) Imaginary axis and therefore system becomes marginally stable
d) The left and therefore system becomes unstable
a) The left and therefore system becomes more stable
b) The right and therefore system becomes unstable
c) Imaginary axis and therefore system becomes marginally stable
d) The left and therefore system becomes unstable
Answer: a
2. 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:
a) 0
b) 0.707
c) 1
d) Infinite
2. 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:
a) 0
b) 0.707
c) 1
d) Infinite
Answer: d
3. When the number of poles is equal to the number of zeroes, how many branches of root locus tends towards infinity?
a) 1
b) 2
c) 0
d) Equal to number of zeroes
3. When the number of poles is equal to the number of zeroes, how many branches of root locus tends towards infinity?
a) 1
b) 2
c) 0
d) Equal to number of zeroes
Answer: c
4. With reference to root locus, the complex conjugate roots of the characteristic equation of the O.L.T.F. given below G(s)H(s) =K(s+3)/(s+1)2, lie on
a) Straight line
b) Parabola
c) Circle
d) Semi-circle
4. With reference to root locus, the complex conjugate roots of the characteristic equation of the O.L.T.F. given below G(s)H(s) =K(s+3)/(s+1)2, lie on
a) Straight line
b) Parabola
c) Circle
d) Semi-circle
Answer: c
5. Determine the centroid of the root locus for the system having G(s)H(s) = K/(s+1)(s2+4s+5)
a) -2.1
b) -1.78
c) -1.66
d) -1.06
5. Determine the centroid of the root locus for the system having G(s)H(s) = K/(s+1)(s2+4s+5)
a) -2.1
b) -1.78
c) -1.66
d) -1.06
Answer: c
6. The loop transfer function of an LTI system is G(s)H(s) =K(s+1)(s+5)/s(s+2)(s+3). For K>0, the point on the real axis that does not belong to the root locus of the system is
a) -0.5
b) -2.5
c) -3.5
d) -5.5
Answer: c
7. The angles of asymptotes of the root loci of the equation s3+5s2+(K+2)s+K=0 are:
a) 0° and 270°
b) 0° and 180°
c) 90° and 270°
d) 90° and 180°
7. The angles of asymptotes of the root loci of the equation s3+5s2+(K+2)s+K=0 are:
a) 0° and 270°
b) 0° and 180°
c) 90° and 270°
d) 90° and 180°
Answer: c
8. The intersection of asymptotes of root loci of a system with open loop transfer function G(s)H(s) = K/s(s+1)(s+3) is
a) 1.44
b) 1.33
c) -1.44
d) -1.33
8. The intersection of asymptotes of root loci of a system with open loop transfer function G(s)H(s) = K/s(s+1)(s+3) is
a) 1.44
b) 1.33
c) -1.44
d) -1.33
Answer: d
9. If a feedback control system has its open loop transfer function G(s)H(s) = K/(s-2)(s2+3s+5) has the root locus plot which intersects the imaginary axis at s =0, then the value of K at this point will be
a) -5
b) 10
c) 5
d) -10
9. If a feedback control system has its open loop transfer function G(s)H(s) = K/(s-2)(s2+3s+5) has the root locus plot which intersects the imaginary axis at s =0, then the value of K at this point will be
a) -5
b) 10
c) 5
d) -10
Answer: b
10. The open loop transfer function of the feedback control system is given by G(s) =K(s+3)/s(s+4)2(s+5)(s+6). The number of asymptotes and the centroid of asymptotes of the root loci of closed loop system is
a) 4 and (-4,0)
b) 3 and (-12,0)
c) -4 and (-4,0)
d) -3 and (-12,0)
10. The open loop transfer function of the feedback control system is given by G(s) =K(s+3)/s(s+4)2(s+5)(s+6). The number of asymptotes and the centroid of asymptotes of the root loci of closed loop system is
a) 4 and (-4,0)
b) 3 and (-12,0)
c) -4 and (-4,0)
d) -3 and (-12,0)
Answer: a
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