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 running 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 the 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. |
is a closed loop system. |
| A. | Auto-pilot for an aircraft |
| B. | Direct current generator |
| C. | Car starter |
| D. | Electric switch |
| Answer» A. Auto-pilot for an aircraft | |
| 19. |
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 | |
| 20. |
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 | |
| 21. |
increases the steady state accuracy. |
| A. | Integrator |
| B. | Differentiator |
| C. | Phase lead compensator |
| D. | Phase lag compensator |
| Answer» A. Integrator | |
| 22. |
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 | |
| 23. |
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 | |
| 24. |
Regenerative feedback implies feedback with |
| A. | oscillations |
| B. | step input |
| C. | negative sign |
| D. | positive sign |
| Answer» D. positive sign | |
| 25. |
The output of a feedback control system must be a function of |
| A. | reference and output |
| B. | reference and input |
| C. | input and feedback signal |
| D. | output and feedback signal |
| Answer» A. reference and output | |
| 26. |
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 | |
| 27. |
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 | |
| 28. |
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 | |
| 29. |
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 | |
| 30. |
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 | |
| 31. |
On which of the following factors does the sensitivity of a closed loop system to gain changes and load disturbances depend ? |
| A. | Frequency |
| B. | Loop gain |
| C. | Forward gain |
| D. | All of the above |
| Answer» D. All of the above | |
| 32. |
The transient response, with feedback system, |
| A. | rises slowly |
| B. | rises quickly |
| C. | decays slowly |
| D. | decays quickly |
| Answer» D. decays quickly | |
| 33. |
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 | |
| 34. |
Which of the following statements is correct for any closed loop system ? |
| A. | All the co-efficients can have zero value |
| B. | All the co-efficients are always non-zero |
| C. | Only one of the static error co-efficients has a finite non-zero value |
| D. | None of the above |
| Answer» C. Only one of the static error co-efficients has a finite non-zero value | |
| 35. |
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 | |
| 36. |
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 | |
| 37. |
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 | |
| 38. |
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 | |
| 39. |
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 | |
| 40. |
A controller, essentially, is a |
| A. | sensor |
| B. | clipper |
| C. | comparator |
| D. | amplifier |
| Answer» C. comparator | |
| 41. |
The capacitance, in force-current analogy, is analogous to |
| A. | momentum |
| B. | velocity |
| C. | displacement |
| D. | mass |
| Answer» D. mass | |
| 42. |
The temperature, under thermal and electrical system analogy, is considered analogous to |
| A. | voltage |
| B. | current |
| C. | capacitance |
| D. | charge |
| Answer» A. voltage | |
| 43. |
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 | |
| 44. |
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 | |
| 45. |
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 | |
| 46. |
In force-voltage analogy, velocity is analogous to |
| A. | current |
| B. | charge |
| C. | inductance |
| D. | capacitance |
| Answer» A. current | |
| 47. |
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 | |
| 48. |
Mass, in force-voltage analogy, is analogous to |
| A. | charge |
| B. | current |
| C. | inductance |
| D. | resistance |
| Answer» C. inductance | |
| 49. |
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 | |
| 50. |
signal will become zero when the feedback signal and reference signs are equal. |
| A. | Input |
| B. | Actuating |
| C. | Feedback |
| D. | Reference |
| Answer» B. Actuating | |
| 51. |
A signal other than the reference input that tends to affect the value of controlled variable is known as |
| A. | disturbance |
| B. | command |
| C. | control element |
| D. | reference input |
| Answer» A. disturbance | |
| 52. |
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 | |
| 53. |
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 | |
| 54. |
is the reference input minus the primary feedback. |
| A. | Manipulated variable |
| B. | Zero sequence |
| C. | Actuating signal |
| D. | Primary feedback |
| Answer» C. Actuating signal | |
| 55. |
With feedback _____ increases. |
| A. | system stability |
| B. | sensitivity |
| C. | gain |
| D. | effects of disturbing signals |
| Answer» A. system stability | |
| 56. |
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 | |
| 57. |
In a system zero initial condition means that |
| A. | The system is at rest and no energy is stored in any of its components |
| B. | The system is working with zero stored energy |
| C. | The system is working with zero reference signal |
| Answer» A. The system is at rest and no energy is stored in any of its components | |
| 58. |
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 | |
| 59. |
Spring constant in force-voltage analogy is analogous to |
| A. | capacitance |
| B. | reciprocal of capacitance |
| C. | current |
| D. | resistance |
| Answer» B. reciprocal of capacitance | |
| 60. |
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 | |
| 61. |
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 | |
| 62. |
Static error co-efficients are used as a measure of the effectiveness of closed loop systems for specified ________ input signal. |
| A. | acceleration |
| B. | velocity |
| C. | position |
| D. | all of the above |
| Answer» D. all of the above | |
| 63. |
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 | |
| 64. |
The type 0 system has ______ at the origin. |
| A. | no pole |
| B. | net pole |
| C. | simple pole |
| D. | two poles |
| Answer» A. no pole | |
| 65. |
The type 1 system has ______ at the origin. |
| A. | no pole |
| B. | net pole |
| C. | simple pole |
| D. | two poles |
| Answer» C. simple pole | |
| 66. |
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 | |
| 67. |
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 | |
| 68. |
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 | |
| 69. |
In case of type-1 system steady state acceleration is |
| A. | unity |
| B. | infinity |
| C. | zero |
| D. | 10 |
| Answer» B. infinity | |
| 70. |
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 | |
| 71. |
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 | |
| 72. |
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 | |
| 73. |
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 | |
| 74. |
technique is not applicable to nonlinear system ? |
| A. | Nyquist Criterion |
| B. | Quasi linearization |
| C. | Functional analysis |
| D. | Phase-plane representation |
| Answer» A. Nyquist Criterion | |
| 75. |
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 | |
| 76. |
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 | |
| 77. |
In a stable control system saturation can cause which of the following ? |
| A. | Low-level oscillations |
| B. | High-level oscillations |
| C. | Conditional stability |
| D. | Overdamping |
| Answer» A. Low-level oscillations | |
| 78. |
Which of the following can be measured by the use of a tacho-generator ? |
| A. | Acceleration |
| B. | Speed |
| C. | Speed and acceleration |
| D. | Displacement |
| Answer» B. Speed | |
| 79. |
is not a final control element. |
| A. | Control valve |
| B. | Potentiometer |
| C. | Electro-pneumatic converter |
| D. | Servomotor |
| Answer» B. Potentiometer | |
| 80. |
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 chan¬ges from maximum to minimum |
| D. | Any of the above |
| Answer» C. The range of measured variables through which the air output chan¬ges from maximum to minimum | |
| 81. |
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 | |
| 82. |
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 | |
| 83. |
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 | |
| 84. |
technique gives quick transient and stability response |
| A. | Root locus |
| B. | Bode |
| C. | Nyquist |
| D. | Nichols |
| Answer» A. Root locus | |
| 85. |
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 | |
| 86. |
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 | |
| 87. |
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 | |
| 88. |
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 | |
| 89. |
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 | |
| 90. |
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 | |
| 91. |
Which of the following can be measured byLVDT? |
| A. | Displacement |
| B. | Velocity |
| C. | Acceleration |
| D. | Any of the above |
| Answer» D. Any of the above | |
| 92. |
directly converts temperature into voltage. |
| A. | Thermocouple |
| B. | Potentiometer |
| C. | Gear train |
| D. | LVDT |
| Answer» A. Thermocouple | |
| 93. |
The transfer function technique is considered as inadequate under which of the following conditions ? |
| A. | Systems having complexities and non-linearities |
| B. | Systems having stability problems |
| C. | Systems having multiple input dis¬turbances |
| D. | All of the above |
| Answer» D. All of the above | |
| 94. |
Which of the following is the output of a thermocouple ? |
| A. | Alternating current |
| B. | Direct current |
| C. | A.C. voltage |
| D. | D.C. voltage |
| Answer» D. D.C. voltage | |
| 95. |
A.C. servomotor is basically a |
| A. | universal motor |
| B. | single phase induction motor |
| C. | two phase induction motor |
| D. | three phase induction motor |
| Answer» C. two phase induction motor | |
| 96. |
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 | |
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