McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Bachelor of Computer Applications (BCA) .
| 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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