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1. |
## A control system working under unknown random action is called |

A. | computer control system |

B. | digital data system |

C. | stochastic control system |

D. | adaptive control system |

Answer» C. stochastic control system |

2. |
## The first order control system, which is is well designed, has a |

A. | small bandwidth |

B. | negative time constant |

C. | large negative transfer function pole |

D. | none of the above |

Answer» C. large negative transfer function pole |

3. |
## Zero-order hold used in practical reconstruction of continuous-time signals is mathematically represented as a weighted-sum of rectangular pulses shifted by: |

A. | any multiples of the sampling interval |

B. | integer multiples of the sampling interval |

C. | one sampling interval |

D. | 1 second intervals |

Answer» B. integer multiples of the sampling interval |

4. |
## Sampling can be done by: |

A. | impulse train sampling |

B. | natural sampling |

C. | flat-top sampling |

D. | all of the mentioned |

Answer» D. all of the mentioned |

5. |
## The first step required to convert analog signal to digital is : |

A. | sampling |

B. | holding |

C. | reconstruction |

D. | quantization |

Answer» A. sampling |

6. |
## Sampling is necessary : |

A. | in complex control systems |

B. | where high accuracy is required |

C. | non automated control systems |

D. | automated control system |

Answer» B. where high accuracy is required |

7. |
## _______________ is a sampling pattern which is repeated periodically |

A. | single order sampling |

B. | multi order sampling |

C. | zero order sampling |

D. | unordered sampling |

Answer» B. multi order sampling |

8. |
## Aliasing is caused when: |

A. | sampling frequency must be equal to the message signal |

B. | sampling frequency must be greater to the message signal |

C. | sampling frequency must be less to the message signal |

D. | sampling frequency must be greater than or equal to the message signal |

Answer» C. sampling frequency must be less to the message signal |

9. |
## The signal is reconstructed back with the help of |

A. | zero order hold circuits |

B. | extrapolations |

C. | signal is reconstructed with zero order holds and extrapolations |

D. | signal is not reconstructed |

Answer» C. signal is reconstructed with zero order holds and extrapolations |

10. |
## A control system working under unknown random actions is called --- |

A. | computer control system |

B. | digital data system |

C. | stochastic control system |

D. | adaptive control system |

Answer» C. stochastic control system |

11. |
## Zero initial condition for a system means |

A. | input reference signal is zero |

B. | zero stored energy |

C. | no initial movement of moving parts |

D. | system is at rest and no energy is stored in any of its components |

Answer» D. system is at rest and no energy is stored in any of its components |

12. |
## The first order control system ,which is well designed has a |

A. | small bandwidth |

B. | negative time constant |

C. | large negative transfer function pole |

D. | none of the above |

Answer» C. large negative transfer function pole |

13. |
## A zero order hold is used with sampled data system to |

A. | make it critically damped |

B. | reconstruct the sampled signal |

C. | improve the stability of the system |

D. | convert it to a continuous system |

Answer» B. reconstruct the sampled signal |

14. |
## A controller is basically a --- |

A. | sensor |

B. | comparator |

C. | amplifier |

D. | clipper |

Answer» B. comparator |

15. |
## Z and Laplace transform are related by: |

A. | s = ln z |

B. | s =ln z/t |

C. | s =z |

D. | s= t/ln z |

Answer» B. s =ln z/t |

16. |
## What is the z-transform of the signal x[n] = an u(n)? |

A. | x(z) =1/z-1 |

B. | x(z) = 1/1-z |

C. | x(z) = z/z-a |

D. | x(z) = 1/z-a |

Answer» C. x(z) = z/z-a |

17. |
## Which one of the following rules determine the mapping of s-plane to z-plane? |

A. | right side of the s-plane maps into outside of the unit circle in z-plane |

B. | left half of s-plane maps into inside of the unit circle |

C. | imaginary axis in s-plane maps into the circumference of the unit circle |

D. | all of the mentioned |

Answer» D. all of the mentioned |

18. |
## Assertion (A): The z-transform of the output of the sampler is given by the series. Reason (R): The relationship is the result of the application of z = e-sT, where T stands for the time gap between the samples. |

A. | both a and r are true and r is correct explanation of a |

B. | both a and r are true but r is not correct explanation of a |

C. | a is true but r is false |

D. | a is false but r is true |

Answer» C. a is true but r is false |

19. |
## Inverse z-transform of the system can be calculated using: |

A. | partial fraction method |

B. | long division method |

C. | basic formula of the z-transform |

D. | all of the mentioned |

Answer» D. all of the mentioned |

20. |
## If the z transform of x(n) is X(z) =z(8z-7)/4z2 -7z+3, then the final value theorem is : |

A. | 1 |

B. | 2 |

C. | ∞ |

D. | 0 |

Answer» A. 1 |

21. |
## Difference equation model results in: |

A. | sampled-data systems |

B. | numerical analysis of continuous time systems |

C. | continuous time feedback systems |

D. | both a & b |

Answer» D. both a & b |

22. |
## Which of the following is an advantage of Laplace transform method |

A. | it gives solution in frequency domain only |

B. | it gives total solution more systematically |

C. | initial conditions are incorporated in the very first step |

D. | both b & c |

Answer» D. both b & c |

23. |
## Analysis of control system by Laplace transform technique is not possible for |

A. | discrete time systems |

B. | linear systems |

C. | time invarient systems |

D. | unstable continuous time systems |

Answer» A. discrete time systems |

24. |
## Z-transform is used in: |

A. | continuous optimal control problem |

B. | discrete optimal problem |

C. | control systems |

D. | none of the mentione |

Answer» B. discrete optimal problem |

25. |
## Unit step response of the system described by the equation y(n) +y(n-1) =x(n) is: |

A. | z2/(z+1)(z-1) |

B. | z/(z+1)(z-1) |

C. | z+1/z-1 |

D. | z(z-1)/z+1 |

Answer» A. z2/(z+1)(z-1) |

26. |
## Difference equation model results in: |

A. | sampled-data systems |

B. | numerical analysis of continuous time systems |

C. | continuous time feedback systems |

D. | both a and b |

Answer» D. both a and b |

27. |
## For relative stability of the system which of the following is sufficient? |

A. | gain margin |

B. | phase margin |

C. | both a and b |

D. | magnitude |

Answer» C. both a and b |

28. |
## Stability of a system implies that : |

A. | small changes in the system input does not result in large change in system output |

B. | small changes in the system parameters does not result in large change in system output |

C. | small changes in the initial conditions does not result in large change in system output |

D. | small changes in the initial conditions result in large change in system output |

Answer» A. small changes in the system input does not result in large change in system output |

29. |
## Linear mathematical model applies to : |

A. | linear systems |

B. | stable systems |

C. | unstable systems |

D. | all of the mentioned |

Answer» B. stable systems |

30. |
## With feedback _____ reduces. |

A. | system stability |

B. | system gain |

C. | system stability and gain |

D. | damping |

Answer» B. system gain |

31. |
## Asymptotic stability is concerned with: |

A. | a system under influence of input |

B. | a system not under influence of input |

C. | a system under influence of output |

D. | a system not under influence of ou |

Answer» B. a system not under influence of input |

32. |
## A linear time invariant system is stable if : |

A. | system in excited by the bounded input, the output is also bounded |

B. | in the absence of input output tends zero |

C. | both a and b |

D. | system in excited by the bounded input, the output is not bounded |

Answer» C. both a and b |

33. |
## If a system is given unbounded input then the system is: |

A. | stable |

B. | unstable |

C. | not defined |

D. | linear |

Answer» C. not defined |

34. |
## If the impulse response in absolutely integrable then the system is : |

A. | absolutely stable |

B. | unstable |

C. | linear |

D. | stable |

Answer» A. absolutely stable |

35. |
## If root of the characteristic equation has positive real part the system is : |

A. | stable |

B. | unstable |

C. | marginally stable |

D. | linear |

Answer» B. unstable |

36. |
## The use of sampled data control system are: |

A. | for using analog components as the part of the control loop |

B. | for time division of control components |

C. | whenever a transmission channel forms a part of closed loop |

D. | none of the mentioned |

Answer» C. whenever a transmission channel forms a part of closed loop |

37. |
## Jury’s test determines whether the roots of a polynomial lie: |

A. | close to unit circle |

B. | within the unit circle |

C. | outside the unit circle |

D. | on the unit circle |

Answer» B. within the unit circle |

38. |
## The transformation technique in which there is one to one mapping from s-domain to z-domain is |

A. | approximation of derivatives |

B. | impulse invariance method |

C. | bilinear transformation method |

D. | backward difference for the derivative |

Answer» C. bilinear transformation method |

39. |
## Parallel form of realisation is done in |

A. | high speed filtering applications |

B. | low speed filtering applications |

C. | both a and b |

D. | none of the above |

Answer» A. high speed filtering applications |

40. |
## In cascade form of realization, how many bits should be used to represent the FIR filter coefficients in order to avoid the quantization effect on filter coefficients? |

A. | 5 to 10 |

B. | 12 to 14 |

C. | 20 to 24 |

D. | 28 to 40 |

Answer» B. 12 to 14 |

41. |
## How is the sampling rate conversion achieved by factor I/D? |

A. | by increase in the sampling rate with (i) |

B. | by filtering the sequence to remove unwanted images of spectra of original signal |

C. | by decimation of filtered signal with factor d |

D. | all of above |

Answer» D. all of above |

42. |
## In the cascaded form of realisation, the polynomials are factored into |

A. | product of 1st-order and 2nd-order polynomials |

B. | product of 2nd-order and 3rd-order polynomials |

C. | sum of 1st-order and 2nd-order polynomials |

D. | sum of 2nd-order and 3rd-order polynomials |

Answer» A. product of 1st-order and 2nd-order polynomials |

43. |
## Open loop transfer function of a system having one zero with a positive real value is called. |

A. | zero phase function |

B. | negative phase function |

C. | positive phase function |

D. | non-minimum phase function |

Answer» D. non-minimum phase function |

44. |
## Consider the function F (s)= 5/s(s2+3s+2), the initial value of f(t) is: |

A. | 5 |

B. | 5/2 |

C. | 5/3 |

D. | 0 |

Answer» D. 0 |

45. |
## In a closed loop for which the output is the speed of the motor, the output rate control can be used to: |

A. | limit the speed of the motor |

B. | limit the torque output of the motor |

C. | reduce the damping of the system |

D. | limit the acceleration of the motor |

Answer» A. limit the speed of the motor |

46. |
## The transfer function of any stable system which has no zeros or poles in the right half of the s-plane is said to be: |

A. | minimum phase transfer function |

B. | non-minimum phase transfer function |

C. | minimum phase frequency response function |

D. | minimum gain transfer function |

Answer» A. minimum phase transfer function |

47. |
## State model representation is possible using _________ |

A. | physical variables |

B. | phase variables |

C. | canonical state variables |

D. | all of the above |

Answer» D. all of the above |

48. |
## Conventional control theory is applicable to ______ systems |

A. | siso |

B. | mimo |

C. | time varying |

D. | non-linear |

Answer» A. siso |

49. |
## The transfer function for the state representation of the continuous time LTI system: dq(t)/dt=Aq(t)+Bx(t) Y(t)=Cq(t)+Dx(t) is given by |

A. | c(si-a)-1b+d |

B. | b(si-a)-1b+d |

C. | c(si-a)-1b+a |

D. | d(si-a)-1b+c |

Answer» A. c(si-a)-1b+d |

50. |
## The system which works on the initial condition without any input applied to it is called as : |

A. | homogeneous system |

B. | non homogeneous system |

C. | linear system |

D. | non linear system |

Answer» A. homogeneous system |

51. |
## The transfer function of a LTI system is given as 1/(s+1). What is the steady-state value of the unit-impulse response? |

A. | 0 |

B. | 1 |

C. | 2 |

D. | infinite |

Answer» A. 0 |

52. |
## The values of the characteristic equation is given by: |

A. | eigen values |

B. | state matrix |

C. | eigen vector |

D. | none of the mentioned |

Answer» A. eigen values |

53. |
## The state variable representation is preferred |

A. | to increase the sensitivity to the plant parameter variations |

B. | to reduce the sensitivity to the plant parameter variations |

C. | to make a plant simple and to control the transient response |

D. | none of the above |

Answer» C. to make a plant simple and to control the transient response |

54. |
## With the knowledge of state space representation the transfer function of the system |

A. | can be determined partly |

B. | can be determined completely |

C. | cannot be determined |

D. | none of the above |

Answer» B. can be determined completely |

55. |
## Which among the following are the interconnected units of state diagram representation? |

A. | scalars |

B. | adders |

C. | integrators |

D. | all of the above |

Answer» D. all of the above |

56. |
## Which among the following controls the speed of D.C. motor? |

A. | galvanometer |

B. | gauss meter |

C. | potentiometer |

D. | tachometer |

Answer» D. tachometer |

57. |
## State model representation is possible using _________ |

A. | . physical variables |

B. | . phase variables |

C. | canonical state variables |

D. | all of the above |

Answer» D. all of the above |

58. |
## Which among the following constitute the state model of a system in addition to state equations? |

A. | . input equations |

B. | . output equations |

C. | state trajectory |

D. | state vector |

Answer» B. . output equations |

59. |
## Which among the following plays a crucial role in determining the state of dynamic system? |

A. | . state variables |

B. | state vector |

C. | state space |

D. | state scalar |

Answer» A. . state variables |

60. |
## What is Eigen value? |

A. | a vector obtained from the coordinates |

B. | a matrix determined from the algebraic equations |

C. | a scalar associated with a given linear transformation |

D. | it is the inverse of the transform |

Answer» C. a scalar associated with a given linear transformation |

61. |
## Let us consider a 3×3 matrix A with Eigen values of λ1, λ2, λ3 and the Eigen values of A-1 are? |

A. | λ1, λ2, λ3 |

B. | 1/λ1,1/λ2,1/λ3 |

C. | -λ1, -λ2, -λ3 |

D. | λ1, 0, 0 |

Answer» B. 1/λ1,1/λ2,1/λ3 |

62. |
## The Eigen values of a 3×3 matrix are λ1, λ2, λ3 then the Eigen values of a matrix A3 are __________ |

A. | λ1, λ2, λ3 |

B. | 1/λ1,1/λ2,1/λ3 |

C. | λ31,λ32,λ33 |

D. | 1, 1, 1 |

Answer» C. λ31,λ32,λ33 |

63. |
## State space analysis is applicable even if the initial conditions are _____ |

A. | zero |

B. | non-zero |

C. | equal |

D. | not equal |

Answer» B. non-zero |

64. |
## According to the property of state transition method, e0 is equal to _____ |

A. | i |

B. | a |

C. | e-at |

D. | -eat |

Answer» C. e-at |

65. |
## Which mechanism in control engineering implies an ability to measure the state by taking measurements at output? |

A. | controllability |

B. | observability |

C. | differentiability |

D. | adaptability |

Answer» B. observability |

66. |
## State model representation is possible using _________ |

A. | physical variables |

B. | phase variables |

C. | canonical state variables |

D. | all of the mentioned |

Answer» D. all of the mentioned |

67. |
## Which among the following constitute the state model of a system in addition to state equations? |

A. | input equations |

B. | output equations |

C. | state trajectory |

D. | state vector |

Answer» B. output equations |

68. |
## Which among the following are the interconnected units of state diagram representation? |

A. | scalars |

B. | adders |

C. | integrator |

D. | all of the mentioned |

Answer» D. all of the mentioned |

69. |
## Which among the following is a unique model of a system? |

A. | transfer function |

B. | state variable |

C. | block diagram |

D. | signal flow graphs |

Answer» A. transfer function |

70. |
## State model is generally not suitable for measuring: |

A. | investigation of system properties |

B. | evaluation of time response |

C. | real variables |

D. | both a and b |

Answer» D. both a and b |

71. |
## ______________ are the techniques for converting general state models into canonical one. |

A. | observable |

B. | controllable |

C. | diagoanlization |

D. | cannonical |

Answer» C. diagoanlization |

72. |
## The diagonalizing matrix is also known as: |

A. | eigen matrix |

B. | modal matrix |

C. | constant matrix |

D. | state matrix |

Answer» B. modal matrix |

73. |
## 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. |

A. | controllable |

B. | observable |

C. | cannot be determined |

D. | controllable and observable |

Answer» A. controllable |

74. |
## A system is said to be_________________ if every state can be completely identified by measurements of the outputs at the finite time interval. |

A. | controllable |

B. | observable |

C. | cannot be determined |

D. | controllable and observable |

Answer» B. observable |

75. |
## Kalman’s test is for : |

A. | observability |

B. | controllability |

C. | optimality |

D. | observability and controllability |

Answer» D. observability and controllability |

76. |
## Consider a system if represented by state space equation and x1 (t) =x2 (t), then the system is: |

A. | controllable |

B. | uncontrollable |

C. | observable |

D. | unstable |

Answer» B. uncontrollable |

77. |
## A transfer function of the system does not have pole-zero cancellation? Which of the following statements is true? |

A. | system is neither controllable nor observable |

B. | system is completely controllable and observable |

C. | system is observable but uncontrollable |

D. | system is controllable and unobservable |

Answer» B. system is completely controllable and observable |

78. |
## The impulse response of a linear LTI system is given as g (t) = e(-t)The transfer function of the system is equal to: |

A. | 1/s |

B. | 1/s(s+1) |

C. | 1/(s+1) |

D. | s/(s+1) |

Answer» C. 1/(s+1) |

79. |
## An oberser or program that that estimates less than n state variables, where n is dimension of stage vector is called |

A. | reduced order state observer |

B. | simply a reduced order observer |

C. | full observer |

D. | state observer |

Answer» A. reduced order state observer |

80. |
## Gilbert's test is used to check |

A. | controllabilty |

B. | observability |

C. | observer |

D. | controlability & observability |

Answer» D. controlability & observability |

81. |
## The necessary and sufficient condition for the system to be completely state controllable is that therank of the composite matrix QC is |

A. | 1 |

B. | n |

C. | 2 |

D. | 3 |

Answer» B. n |

82. |
## In control system an error detector |

A. | detects error and signal out an alarm |

B. | detects error of the system |

C. | produces an error signal as actual difference of value and desired value of output |

D. | any of the above |

Answer» B. detects error of the system |

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