McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Electrical Engineering , Electronics and Telecommunication Engineering [ENTC] .
| 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 | |
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