McqMate
| 1. |
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» A. output is independent of control input | |
| 2. |
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» B. recalibration is not required for maintaining the required quality of the output | |
| 3. |
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» A. closed loop system | |
| 4. |
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» A. decrease | |
| 5. |
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» A. field controlled d.c. motor | |
| 6. |
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» B. presence of non-linearities causes malfunctioning | |
| 7. |
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» D. the control action is independent of the output | |
| 8. |
has tendency to oscillate. |
| A. | open loop system |
| B. | closed loop system |
| C. | both (a) and (b) |
| D. | neither (a) nor (b) |
| Answer» B. closed loop system | |
| 9. |
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» B. slow response | |
| 10. |
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» C. needle of the speedometer | |
| 11. |
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» A. transient response | |
| 12. |
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 | |
| 13. |
An automatic toaster is a ______ loop control system. |
| A. | open |
| B. | closed |
| C. | partially closed |
| D. | any of the above |
| Answer» A. open | |
| 14. |
Any externally introduced signal affecting the controlled output is called a |
| A. | feedback |
| B. | stimulus |
| C. | signal |
| D. | gain control |
| Answer» B. stimulus | |
| 15. |
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» B. feedback | |
| 16. |
is a part of the human temperature control system. |
| A. | digestive system |
| B. | perspiration system |
| C. | ear |
| D. | leg movement |
| Answer» B. perspiration system | |
| 17. |
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» D. eyes | |
| 18. |
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» D. any of the above | |
| 19. |
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» B. the gain of the system should be increased | |
| 20. |
increases the steady state accuracy. |
| A. | integrator |
| B. | differentiator |
| C. | phase lead compensator |
| D. | phase lag compensator |
| Answer» A. integrator | |
| 21. |
A.C. servomotor resembles |
| A. | two phase induction motor |
| B. | three phase induction motor |
| C. | direct current series motor |
| D. | universal motor |
| Answer» A. two phase induction motor | |
| 22. |
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» A. band width | |
| 23. |
Regenerative feedback implies feedback with |
| A. | oscillations |
| B. | step input |
| C. | negative sign |
| D. | positive sign |
| Answer» D. positive sign | |
| 24. |
is an open loop control system. |
| A. | ward leonard control |
| B. | field controlled d.c. motor |
| C. | stroboscope |
| D. | metadyne |
| Answer» B. field controlled d.c. motor | |
| 25. |
A control system with excessive noise, is likely to suffer from |
| A. | saturation in amplifying stages |
| B. | loss of gain |
| C. | vibrations |
| D. | oscillations |
| Answer» A. saturation in amplifying stages | |
| 26. |
Zero initial condition for a system means |
| A. | input reference signal is zero |
| B. | zero stored energy |
| C. | ne 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 | |
| 27. |
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» C. the output for any given input | |
| 28. |
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» C. increases by the sane saaaajajt as the gain decrease | |
| 29. |
load disturbances depend ? |
| A. | frequency |
| B. | loop gain |
| C. | forward gain |
| D. | all of the above |
| Answer» D. all of the above | |
| 30. |
The transient response, with feedback system, |
| A. | rises slowly |
| B. | rises quickly |
| C. | decays slowly |
| D. | decays quickly |
| Answer» D. decays quickly | |
| 31. |
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» D. the time constant and suppress the oscillations | |
| 32. |
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» C. the system is highly oscillatory | |
| 33. |
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» C. noise is proportional to band width | |
| 34. |
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» D. low-level oscillations | |
| 35. |
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» D. oscillator | |
| 36. |
In a control system the output of the controller is given to |
| A. | final control element |
| B. | amplifier |
| C. | comparator |
| D. | sensor |
| Answer» A. final control element | |
| 37. |
A controller, essentially, is a |
| A. | sensor |
| B. | clipper |
| C. | comparator |
| D. | amplifier |
| Answer» C. comparator | |
| 38. |
The capacitance, in force-current analogy, is analogous to |
| A. | momentum |
| B. | velocity |
| C. | displacement |
| D. | mass |
| Answer» D. mass | |
| 39. |
The temperature, under thermal and electrical system analogy, is considered analogous to |
| A. | voltage |
| B. | current |
| C. | capacitance |
| D. | charge |
| Answer» A. voltage | |
| 40. |
In electrical-pneumatic system analogy the current is considered analogous to |
| A. | velocity |
| B. | pressure |
| C. | air flow |
| D. | air flow rate |
| Answer» D. air flow rate | |
| 41. |
In liquid level and electrical system analogy, voltage is considered analogous to |
| A. | head |
| B. | liquid flow |
| C. | liquid flow rate |
| D. | none of the above |
| Answer» A. head | |
| 42. |
The viscous friction co-efficient, in force-voltage analogy, is analogous to |
| A. | charge |
| B. | resistance |
| C. | reciprocal of inductance |
| D. | reciprocal of conductance |
| Answer» B. resistance | |
| 43. |
In force-voltage analogy, velocity is analogous to |
| A. | current |
| B. | charge |
| C. | inductance |
| D. | capacitance |
| Answer» A. current | |
| 44. |
In thermal-electrical analogy charge is considered analogous to |
| A. | heat flow |
| B. | reciprocal of heat flow |
| C. | reciprocal of temperature |
| D. | temperature |
| Answer» D. temperature | |
| 45. |
Mass, in force-voltage analogy, is analogous to |
| A. | charge |
| B. | current |
| C. | inductance |
| D. | resistance |
| Answer» C. inductance | |
| 46. |
The transient response of a system is mainly due to |
| A. | inertia forces |
| B. | internal forces |
| C. | stored energy |
| D. | friction |
| Answer» C. stored energy | |
| 47. |
signal will become zero when the feedback signal and reference signs are equal. |
| A. | input |
| B. | actuating |
| C. | feedback |
| D. | reference |
| Answer» B. actuating | |
| 48. |
as |
| A. | disturbance |
| B. | command |
| C. | control element |
| D. | reference input |
| Answer» A. disturbance | |
| 49. |
The transfer function is applicable to which of the following ? |
| A. | linear and time-in variant systems |
| B. | linear and time-variant systems |
| C. | linear systems |
| D. | non-linear systems |
| Answer» A. linear and time-in variant systems | |
| 50. |
From which of the following transfer function can be obtained ? |
| A. | signal flow graph |
| B. | analogous table |
| C. | output-input ratio |
| D. | standard block system |
| Answer» A. signal flow graph | |
| 51. |
is the reference input minus the primary feedback. |
| A. | manipulated variable |
| B. | zero sequence |
| C. | actuating signal |
| D. | primary feedback |
| Answer» C. actuating signal | |
| 52. |
With feedback _____ increases. |
| A. | system stability |
| B. | sensitivity |
| C. | gain |
| D. | effects of disturbing signals |
| Answer» A. system stability | |
| 53. |
By which of the following the system response can be tested better ? |
| A. | ramp input signal |
| B. | sinusoidal input signal |
| C. | unit impulse input signal |
| D. | exponentially decaying signal |
| Answer» C. unit impulse input signal | |
| 54. |
In a system low friction co-efficient facilitates |
| A. | reduced velocity lag error |
| B. | increased velocity lag error |
| C. | increased speed of response |
| D. | reduced time constant of the system |
| Answer» A. reduced velocity lag error | |
| 55. |
Spring constant in force-voltage analogy is analogous to |
| A. | capacitance |
| B. | reciprocal of capacitance |
| C. | current |
| D. | resistance |
| Answer» B. reciprocal of capacitance | |
| 56. |
The frequency and time domain are related through which of the following? |
| A. | laplace transform and fourier integral |
| B. | laplace transform |
| C. | fourier integral |
| D. | either (b) or (c) |
| Answer» A. laplace transform and fourier integral | |
| 57. |
An increase in gain, in most systems, leads to |
| A. | smaller damping ratio |
| B. | larger damping ratio |
| C. | constant damping ratio |
| D. | none of the above |
| Answer» A. smaller damping ratio | |
| 58. |
specified ________ input signal. |
| A. | acceleration |
| B. | velocity |
| C. | position |
| D. | all of the above |
| Answer» D. all of the above | |
| 59. |
A conditionally stable system exhibits poor stability at |
| A. | low frequencies |
| B. | reduced values of open loop gain |
| C. | increased values of open loop gain |
| D. | none of the above |
| Answer» B. reduced values of open loop gain | |
| 60. |
The type 0 system has ______ at the origin. |
| A. | no pole |
| B. | net pole |
| C. | simple pole |
| D. | two poles |
| Answer» A. no pole | |
| 61. |
The type 1 system has ______ at the origin. |
| A. | no pole |
| B. | net pole |
| C. | simple pole |
| D. | two poles |
| Answer» C. simple pole | |
| 62. |
The type 2 system has ______ at the origin. |
| A. | no net pole |
| B. | net pole |
| C. | simple pole |
| D. | two poles |
| Answer» D. two poles | |
| 63. |
The position and velocity errors of a type-2 system are |
| A. | constant, constant |
| B. | constant, infinity |
| C. | zero, constant |
| D. | zero, zero |
| Answer» C. zero, constant | |
| 64. |
Velocity error constant of a system is measured when the input to the system is unit _______ function. |
| A. | parabolic |
| B. | ramp |
| C. | impulse |
| D. | step |
| Answer» B. ramp | |
| 65. |
In case of type-1 system steady state acceleration is |
| A. | unity |
| B. | infinity |
| C. | zero |
| D. | 10 |
| Answer» B. infinity | |
| 66. |
If a step function is applied to the input of a system and the output remains below a certain level for all the time, the system is |
| A. | not necessarily stable |
| B. | stable |
| C. | unstable |
| D. | always unstable |
| Answer» A. not necessarily stable | |
| 67. |
Which of the following is the best method for determining the stability and transient response ? |
| A. | root locus |
| B. | bode plot |
| C. | nyquist plot |
| D. | none of the above |
| Answer» A. root locus | |
| 68. |
Phase margin of a system is used to specify which of the following ? |
| A. | frequency response |
| B. | absolute stability |
| C. | relative stability |
| D. | time response |
| Answer» C. relative stability | |
| 69. |
Addition of zeros in transfer function causes which of the following ? |
| A. | lead-compensation |
| B. | lag-compensation |
| C. | lead-lag compensation |
| D. | none of the above |
| Answer» B. lag-compensation | |
| 70. |
technique is not applicable to nonlinear system ? |
| A. | nyquist criterion |
| B. | quasi linearization |
| C. | functional analysis |
| D. | phase-plane representation |
| Answer» A. nyquist criterion | |
| 71. |
In order to increase the damping of a badly underdamped system which of following compensators may be used ? |
| A. | phase-lead |
| B. | phase-lag |
| C. | both (a) and (b) |
| D. | either (a) and (b) |
| Answer» A. phase-lead | |
| 72. |
The phase lag produced by transportation relays |
| A. | is independent of frequency |
| B. | is inverseh’proportional to frequency |
| C. | increases linearly with frequency |
| D. | decreases linearly with frequency |
| Answer» C. increases linearly with frequency | |
| 73. |
Which of the following can be measured by the use of a tachogenerator ? |
| A. | acceleration |
| B. | speed |
| C. | speed and acceleration |
| D. | displacement |
| Answer» B. speed | |
| 74. |
is not a final control element. |
| A. | control valve |
| B. | potentiometer |
| C. | electropneumatic converter |
| D. | servomotor |
| Answer» B. potentiometer | |
| 75. |
Which of the following is the definition of proportional band of a controller ? |
| A. | the range of air output as measured variable varies from maximum to minimum |
| B. | the range of measured variables from set value |
| C. | the range of measured variables through which the air output changes from maximum to minimum |
| D. | any of the above |
| Answer» C. the range of measured variables through which the air output changes from maximum to minimum | |
| 76. |
In pneumatic control systems the control valve used as final control element converts |
| A. | pressure signal to electric signal |
| B. | pressure signal to position change |
| C. | electric signal to pressure signal |
| D. | position change to pressure signal |
| Answer» B. pressure signal to position change | |
| 77. |
Pressure error can be measured by which of the following ? |
| A. | differential bellows and straingauge |
| B. | selsyn |
| C. | strain gauge |
| D. | strain gauge and potentiometer |
| Answer» A. differential bellows and straingauge | |
| 78. |
Which of the following devices is used for conversion of co-ordinates ? |
| A. | microsyn |
| B. | selsyn |
| C. | synchro-resolver |
| D. | synchro-transformer |
| Answer» C. synchro-resolver | |
| 79. |
The effect of error damping is to |
| A. | provide larger settling lime |
| B. | delay the response |
| C. | reduce steady state error |
| D. | any of the above |
| Answer» C. reduce steady state error | |
| 80. |
technique gives quick transient and stability response |
| A. | root locus |
| B. | bode |
| C. | nyquist |
| D. | nichols |
| Answer» A. root locus | |
| 81. |
A phase lag lead network introduces in the output |
| A. | lag at all frequencies |
| B. | lag at high frequencies and lead at low frequencies |
| C. | lag at low frequencies and lead at high frequencies |
| D. | none of the above |
| Answer» C. lag at low frequencies and lead at high frequencies | |
| 82. |
Which of the following is the non-linearity caused by servomotor ? |
| A. | static friction |
| B. | backlash |
| C. | saturation |
| D. | none of the above |
| Answer» C. saturation | |
| 83. |
can be extended to systems which are time-varying ? |
| A. | bode-nyquist stability methods |
| B. | transfer functions |
| C. | root locus design |
| D. | state model representatives |
| Answer» D. state model representatives | |
| 84. |
When the initial conditions of a system are specified to be zero it implies that the system is |
| A. | at rest without any energy stored in it |
| B. | working normally with reference input |
| C. | working normally with zero reference input |
| D. | at rest but stores energy |
| Answer» D. at rest but stores energy | |
| 85. |
Which of the following is an electromagnetically device ? |
| A. | induction relay |
| B. | thermocouple |
| C. | lvdt |
| D. | any of the above |
| Answer» C. lvdt | |
| 86. |
A differentiator is usually not a part of a control system because it |
| A. | reduces damping |
| B. | reduces the gain margin |
| C. | increases input noise |
| D. | increases error |
| Answer» C. increases input noise | |
| 87. |
If the gain of the critical damped system is increased it will behave as |
| A. | oscillatory |
| B. | critically damped |
| C. | overdamped |
| D. | underdamped |
| Answer» D. underdamped | |
| 88. |
In a control system integral error compensation _______ steady state error |
| A. | increases |
| B. | minimizes |
| C. | does not have any effect on |
| D. | any of the above |
| Answer» B. minimizes | |
| 89. |
An amplidyne can give which of the following characteristics ? |
| A. | constant current |
| B. | constant voltage |
| C. | constant current as well as constant voltage |
| D. | constant current, constant voltage and constant power |
| Answer» D. constant current, constant voltage and constant power | |
| 90. |
Which of the following can be measured by LVDT? |
| A. | displacement |
| B. | velocity |
| C. | acceleration |
| D. | any of the above |
| Answer» D. any of the above | |
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