1. The constant M-circle represented by the equation x^2+2.25x+y^2=-1.25 has the value of M equal to:
Correct : C. 3
2. What is the value of M for the constant M circle represented by the equation 8x2+18x+8y2+9=0?
Correct : C. 3
3. The constant N loci represented by the equation x^2+x+y^2=0 is for the value of phase angle equal to:
Correct : D. 90°
4. 4 DESIGN OF COMPENSATORS USING BODE PLOT
Correct : A. -1 and origin
5. Which one of the following statements is correct? Nichol’s chart is useful for the detailed study analysis of:
Correct : A. closed loop frequency response
6. Frequency range of bode magnitude and phases are decided by :
Correct : D. none of the above
7. OLTF contains one zero in right half of s- plane then
Correct : C. close loop system is unstable for higher gain
8. The critical value of gain for a system is 40 and gain margin is 6dB. The system is operating at a gain of:
Correct : A. 20
9. Nichol’s chart is useful for the detailed study and analysis of:
Correct : A. closed loop frequency response
10. The roots of the characteristic equation of the second order system in which real and imaginary part represents the :
Correct : B. damping and damped frequency
11. An all-pass network imparts only
Correct : D. 180 degree phase shift to the input
12. Which of the following is an effect of lag compensation?
Correct : A. decrease bandwidth
13. PD controller:
Correct : B. rise time decreases
14. PID controller:
Correct : A. decreases steady state error and improves stability
15. PI controller:
Correct : C. transient response becomes poorer
16. Proportional controller
Correct : D. increases steady state error
17. Lead compensator increases bandwidth
Correct : A. true
18. Lag compensator reduces
Correct : B. velocity constant
19. A linear time invariant system is stable if :
Correct : C. both a and b
20. Asymptotic stability is concerned with:
Correct : B. a system not under influence of input
21. Bounded input and Bounded output stability notion concerns with :
Correct : A. a system under influence of input
22. If a system is given unbounded input then the system is:
Correct : C. not defined
23. Linear mathematical model applies to :
Correct : B. stable systems
24. For non-linear systems stability cannot be determined due to:
Correct : D. all of the mentioned
25. If the impulse response in absolutely integrable then the system is :
Correct : A. absolutely stable
26. The roots of the transfer function do not have any effect on the stability of the system.
Correct : B. false
27. Roots with higher multiplicity on the imaginary axis makes the system :
Correct : B. unstable
28. Roots on the imaginary axis makes the system :
Correct : C. marginally stable
29. If root of the characteristic equation has positive real part the system is :
Correct : B. unstable
30. A linear system can be classified as :
Correct : D. all of the mentioned
31. is a quantitative measure of how fast the transients die out in the system.
Correct : D. relative stability
32. Root locus of s(s+2)+K(s+4) =0 is a circle. What are the coordinates of the center of this circle?
Correct : C. -4,0
33. The main objective of drawing root locus plot is :
Correct : D. both b and c
34. While increasing the value of gain K, the system becomes
Correct : A. less stable
35. The addition of open loop poles pulls the root locus towards:
Correct : D. the right and system becomes unstable
36. Root locus is used to calculate:
Correct : D. relative stability
37. Routh Hurwitz criterion is better than root locus.
Correct : B. false
38. Consider the following statements regarding root loci:
Correct : B. all root loci end at the respective zeros of g(s) h(s) or go to infinity
39. Number of roots of characteristic equation is equal to the number of
Correct : A. branches
40. Which of the following statements are correct?
Correct : C. root locus is for the negative feedback and complementary root locus is for the positive feedback systems
41. Consider the loop transfer function K(s+6)/(s+3)(s+5) In the root locus diagram the centroid will be located at:
Correct : C. -2
42. Which one of the following applications software’s is used to obtain an accurate root locus for?
Correct : B. matlab
43. Which one of the following is not the property of root loci?
Correct : A. the root locus is symmetrical about imaginary axis
44. The breakaway point calculated mathematically must always lie on the root locus.
Correct : A. true
45. What is the number of the root locus segments which do not terminate on zeroes?
Correct : C. the difference between the number of poles and zeroes
46. Which one of the following are correct? The root locus is the path of the roots of the characteristic equation traced out in the s- plane?
Correct : C. as a system parameter is changed
47. If the gain of the system is reduced to a zero value, the roots of the system in the s- plane,
Correct : D. coincide with the poles
48. The addition of open loop zero pulls the root loci towards:
Correct : A. the left and therefore system becomes more stable
49. 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:
Correct : D. infinite
50. When the number of poles is equal to the number of zeroes, how many branches of root locus tends towards infinity?
Correct : C. 0
51. System transformation on function H(z) for a discrete time LTI system expressed in state variable form with zero initial condition
Correct : A. -1b+d
52. State space analysis is applicable for non- linear systems and for multiple input and output systems.
Correct : A. true
53. When human being tries to approach an object, his brain acts as,
Correct : B. a controller
54. For two-phase AC servomotor, if the rotor’s resistance and reactance are respectively R and X, its length and diameter are respectively L and D then,
Correct : C. x/r is small but l/d is large
55. Error detector:
Correct : A. armature controlled fhp dc motor
56. Servomotor:
Correct : B. a pair of synchronous transmitter and control transformer
57. Amplifier:
Correct : D. amplidyne
58. A differentiator is usually not a part of a control system because it
Correct : C. increases input noise
59. If the gain of the critical damped system is increased it will behave as
Correct : D. underdamped
60. In a control system integral error compensation steady state error
Correct : B. minimizes
61. With feedback reduces.
Correct : B. system gain
62. An amplidyne can give which of the following characteristics?
Correct : D. constant current, constant voltage and constant power
63. Which of the following can be measured by LVDT?
Correct : D. all of the mentioned
64. directly converts temperature into voltage.
Correct : A. thermocouple
65. The transfer function technique is considered as inadequate under which of the following conditions?
Correct : D. all of the mentioned
66. Which of the following is the output of a thermocouple?
Correct : D. d.c. voltage
67. A system is said to be if it is possible to transfer the system state from any initial state to any desired state in finite interval of time.
Correct : A. controllable
68. A system is said to be if every state can be completely identified by measurements of the outputs at the finite time interval.
Correct : B. observable
69. Kalman’s test is for :
Correct : D. observability and controllability
70. Consider a system if represented by state space equation and x1 (t) =x2 (t), then the system is:
Correct : B. uncontrollable
71. A transfer function of the system does not have pole-zero cancellation? Which of the following statements is true?
Correct : B. system is completely controllable and observable
72. Complex conjugate pair:
Correct : B. focus point
73. Pure imaginary pair:
Correct : A. centre
74. Real and equal but with opposite sign.
Correct : C. saddle point
75. Real distinct and negative.
Correct : D. stable node
76. Stability of a system implies that :
Correct : D. all of the above mentioned
77. If the roots of the have negative real parts then the response is
Correct : D. bounded
78. Which among the following is a unique model of a system?
Correct : A. transfer function
79. According to the property of state transition method, e0 is equal to
Correct : C. e-at
80. Which mechanism in control engineering implies an ability to measure the state by taking measurements at output?
Correct : B. observability
81. State model representation is possible using
Correct : D. all of the mentioned
82. Which among the following constitute the state model of a system in addition to state equations?
Correct : B. output equations
83. Which among the following plays a crucial role in determining the state of dynamic system?
Correct : A. state variables
84. Which among the following are the interconnected units of state diagram representation?
Correct : D. all of the mentioned
85. State space analysis is applicable even if the initial conditions are
Correct : B. non-zero
86. Conventional control theory is applicable to systems
Correct : A. siso
87. Insertion of negative feedback in control system affects:
Correct : B. the transient response to decay very fast