MCQOPTIONS
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MCQOPTIONS
This section includes 85 Mcqs, each offering curated multiple-choice questions to sharpen your Bachelor of Computer Applications (BCA) knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
The capacitance, in force-current analogy, is analogous to |
| A. | momentum |
| B. | velocity |
| C. | displacement |
| D. | mass |
| Answer» E. | |
| 52. |
A controller, essentially, is a |
| A. | sensor |
| B. | clipper |
| C. | comparator |
| D. | amplifier |
| Answer» D. amplifier | |
| 53. |
In a control system the output of the controller is given to |
| A. | final control element |
| B. | amplifier |
| C. | comparator |
| D. | sensor |
| Answer» B. amplifier | |
| 54. |
In an automatic control system which of the following elements is not used ? |
| A. | error detector |
| B. | final control element |
| C. | sensor |
| D. | oscillator |
| Answer» E. | |
| 55. |
In a stable control system backlash can cause which of the following ? |
| A. | underdamping |
| B. | overdamping |
| C. | poor stability at reduced values of open loop gain |
| D. | low-level oscillations |
| Answer» E. | |
| 56. |
Due to which of the following reasons excessive bond width in control systems should be avoided ? |
| A. | it leads to slow speed of response |
| B. | it leads to low relative stability |
| C. | noise is proportional to band width |
| D. | none of the above |
| Answer» D. none of the above | |
| 57. |
Which of the following statements is correct for a system with gain margin close to unity or a phase margin close to zero ? |
| A. | the system is relatively stable |
| B. | the system is highly stable |
| C. | the system is highly oscillatory |
| D. | none of the above |
| Answer» D. none of the above | |
| 58. |
The second derivative input signals modify which of the following ? |
| A. | the time constant of the system |
| B. | damping of the system |
| C. | the gain of the system |
| D. | the time constant and suppress the oscillations |
| Answer» E. | |
| 59. |
The transient response, with feedback system, |
| A. | rises slowly |
| B. | rises quickly |
| C. | decays slowly |
| D. | decays quickly |
| Answer» E. | |
| 60. |
load disturbances depend ? |
| A. | frequency |
| B. | loop gain |
| C. | forward gain |
| D. | all of the above |
| Answer» E. | |
| 61. |
The band width, in a feedback amplifier. |
| A. | remains unaffected |
| B. | decreases by the same amount as the gain increase |
| C. | increases by the sane saaaajajt as the gain decrease |
| D. | decreases by the same amount as the gain decrease |
| Answer» D. decreases by the same amount as the gain decrease | |
| 62. |
Transfer function of a system is used to calculate which of the following ? |
| A. | the order of the system |
| B. | the time constant |
| C. | the output for any given input |
| D. | the steady state gain |
| Answer» D. the steady state gain | |
| 63. |
is an open loop control system. |
| A. | ward leonard control |
| B. | field controlled d.c. motor |
| C. | stroboscope |
| D. | metadyne |
| Answer» C. stroboscope | |
| 64. |
As a result of introduction of negative feedback which of the following will not decrease ? |
| A. | band width |
| B. | overall gain |
| C. | distortion |
| D. | instability |
| Answer» B. overall gain | |
| 65. |
A.C. servomotor resembles |
| A. | two phase induction motor |
| B. | three phase induction motor |
| C. | direct current series motor |
| D. | universal motor |
| Answer» B. three phase induction motor | |
| 66. |
increases the steady state accuracy. |
| A. | integrator |
| B. | differentiator |
| C. | phase lead compensator |
| D. | phase lag compensator |
| Answer» B. differentiator | |
| 67. |
Which of the following should be done to make an unstable system stable ? |
| A. | the gain of the system should be decreased |
| B. | the gain of the system should be increased |
| C. | the number of poles to the loop transfer function should be increased |
| D. | the number of zeros to the loop transfer function should be increased |
| Answer» C. the number of poles to the loop transfer function should be increased | |
| 68. |
Which of the following devices are commonly used as error detectors in instruments ? |
| A. | vernistats |
| B. | microsyns |
| C. | resolvers |
| D. | any of the above |
| Answer» E. | |
| 69. |
By which of the following the control action is determined when a man walks along a path ? |
| A. | brain |
| B. | hands |
| C. | legs |
| D. | eyes |
| Answer» E. | |
| 70. |
is a part of the human temperature control system. |
| A. | digestive system |
| B. | perspiration system |
| C. | ear |
| D. | leg movement |
| Answer» C. ear | |
| 71. |
A closed loop system is distinguished from open loop system by which of the following ? |
| A. | servomechanism |
| B. | feedback |
| C. | output pattern |
| D. | input pattern |
| Answer» C. output pattern | |
| 72. |
Any externally introduced signal affecting the controlled output is called a |
| A. | feedback |
| B. | stimulus |
| C. | signal |
| D. | gain control |
| Answer» C. signal | |
| 73. |
An automatic toaster is a ______ loop control system. |
| A. | open |
| B. | closed |
| C. | partially closed |
| D. | any of the above |
| Answer» B. closed | |
| 74. |
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» D. adaptive control system | |
| 75. |
The initial response when tne output is not equal to input is called |
| A. | transient response |
| B. | error response |
| C. | dynamic response |
| D. | either of the above |
| Answer» B. error response | |
| 76. |
A car is raining at a constant speed of 50 km/h, which of the following is the feedback element for the driver ? |
| A. | clutch |
| B. | eyes |
| C. | needle of the speedometer |
| D. | steering wheel |
| Answer» D. steering wheel | |
| 77. |
A good control system has all the following features except |
| A. | good stability |
| B. | slow response |
| C. | good accuracy |
| D. | sufficient power handling capacity |
| Answer» C. good accuracy | |
| 78. |
has tendency to oscillate. |
| A. | open loop system |
| B. | closed loop system |
| C. | both (a) and (b) |
| D. | neither (a) nor (b) |
| Answer» C. both (a) and (b) | |
| 79. |
In open loop system |
| A. | the control action depends on the size of the system |
| B. | the control action depends on system variables |
| C. | the control action depends on the input signal |
| D. | the control action is independent of the output |
| Answer» E. | |
| 80. |
Which of the following statements is not necessarily correct for open control system ? |
| A. | input command is the sole factor responsible for providing the control action |
| B. | presence of non-linearities causes malfunctioning |
| C. | less expensive |
| D. | generally free from problems of non-linearities |
| Answer» C. less expensive | |
| 81. |
Which of the following is an open loop control system ? |
| A. | field controlled d.c. motor |
| B. | ward leonard control |
| C. | metadyne |
| D. | stroboscope |
| Answer» B. ward leonard control | |
| 82. |
In closed loop control system, with positive value of feedback gain the overall gain of the system will |
| A. | decrease |
| B. | increase |
| C. | be unaffected |
| D. | any of the above |
| Answer» B. increase | |
| 83. |
A control system in which the control action is somehow dependent on the output is known as |
| A. | closed loop system |
| B. | semiclosed loop system |
| C. | open system |
| D. | none of the above |
| Answer» B. semiclosed loop system | |
| 84. |
For open control system which of the following statements is incorrect ? |
| A. | less expensive |
| B. | recalibration is not required for maintaining the required quality of the output |
| C. | construction is simple and maintenance easy |
| D. | errors are caused by disturbances |
| Answer» C. construction is simple and maintenance easy | |
| 85. |
In an open loop control system |
| A. | output is independent of control input |
| B. | output is dependent on control input |
| C. | only system parameters have effect on the control output |
| D. | none of the above |
| Answer» B. output is dependent on control input | |