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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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