CONTROL SYSTEM MCQs SET 29
1. The characteristic
equation of a control system is given as 1+ K(s+4)/s(s+7)(s2+2s+2)=0.
The real axis intercept for root locus asymptote is:
a) -2.25
b) -1
c) -1.67
d) 0
a) -2.25
b) -1
c) -1.67
d) 0
Answer: c
2. The OLTF of a unity feedback system is K(s+2)(s+4)/(s+5)(s+6) the angle of arrival of the root loci as s =-2, and s =-4 respectively are:
a) 0°,180°
b) 180°,0°
c) 90°,180°
d) 180°, 90°
2. The OLTF of a unity feedback system is K(s+2)(s+4)/(s+5)(s+6) the angle of arrival of the root loci as s =-2, and s =-4 respectively are:
a) 0°,180°
b) 180°,0°
c) 90°,180°
d) 180°, 90°
Answer: b
3. The characteristic equation is s3+14s2+(45+K)s+K =0, centroid is located at (-x,0) then the value of x is ____________
a) 1
b) 2
c) 3
d) 4
3. The characteristic equation is s3+14s2+(45+K)s+K =0, centroid is located at (-x,0) then the value of x is ____________
a) 1
b) 2
c) 3
d) 4
Answer: b
4. Consider the points s1 =-3+4j and s2 = -3-2j in the s-plane. Then, for a system with the open loop transfer function G(s)H(s) =K/(s+1)4.
a) S1 is on the root locus but s2 is not
b) S2 is on the root locus but s1 is not
c) Both s1 and s2 are not on the root locus
d) Neither s1 nor s2 is on the root locus
4. Consider the points s1 =-3+4j and s2 = -3-2j in the s-plane. Then, for a system with the open loop transfer function G(s)H(s) =K/(s+1)4.
a) S1 is on the root locus but s2 is not
b) S2 is on the root locus but s1 is not
c) Both s1 and s2 are not on the root locus
d) Neither s1 nor s2 is on the root locus
Answer: b
5. The characteristic equation of a control system is given by s(s+4)(s2+2s+s) +k(s+1) =0. What are the angles of the asymptotes for the root loci
a) 60°, 180°, 300°
b) 0°, 180°, 300°
c) 120°, 180°, 240°
d) 0°, 120°, 240°
5. The characteristic equation of a control system is given by s(s+4)(s2+2s+s) +k(s+1) =0. What are the angles of the asymptotes for the root loci
a) 60°, 180°, 300°
b) 0°, 180°, 300°
c) 120°, 180°, 240°
d) 0°, 120°, 240°
Answer: a
6. The characteristic equation of a feedback control system is given by s3+5s2+(K+6)s+K=0. In the root loci diagram, the asymptotes of the root loci for large K meet at a point in the s plane whose coordinates are:
a) (2,0)
b) (-1,0)
c) (-2,0)
d) (-3,0)
6. The characteristic equation of a feedback control system is given by s3+5s2+(K+6)s+K=0. In the root loci diagram, the asymptotes of the root loci for large K meet at a point in the s plane whose coordinates are:
a) (2,0)
b) (-1,0)
c) (-2,0)
d) (-3,0)
Answer: c
7. The root locus diagram has loop transfer function G(s)H(s) = K/ s(s+4)(s2+4s+5) has
a) No breakaway points
b) Three real breakaway points
c) Only one breakaway points
d) One real and two complex breakaway points
7. The root locus diagram has loop transfer function G(s)H(s) = K/ s(s+4)(s2+4s+5) has
a) No breakaway points
b) Three real breakaway points
c) Only one breakaway points
d) One real and two complex breakaway points
Answer: b
8. For asymptotes passing from breakaway point then this point is also centroid
a) True
b) False
8. For asymptotes passing from breakaway point then this point is also centroid
a) True
b) False
Answer: a
9. Transportation lag is seen in systems:
a) Amount to be transferred in large
b) Time take to transfer is large
c) Inefficiency of the process
d) Errors
9. Transportation lag is seen in systems:
a) Amount to be transferred in large
b) Time take to transfer is large
c) Inefficiency of the process
d) Errors
Answer: b
10. Mediums responsible for transportation lag are:
a) Lines
b) Pipes
c) Belt conveyors
d) All of the mentioned
10. Mediums responsible for transportation lag are:
a) Lines
b) Pipes
c) Belt conveyors
d) All of the mentioned
Answer: d
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