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