control systems MCQs – Page 5

Practise focused control systems questions with marked answers for exam preparation and subject revision.

control systems Mcqs

81. In a control system integral error compensation _________________ steady state error?
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A. any of the above

B. does not have any effect on

C. minimizes

D. increases

82. In an automatic control system which of the following elements is not used ?
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A. Final control element

B. Oscillator

C. Error detector

D. Sensor

83. Which of the following devices are commonly used as error detectors in instruments ?
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A. Any of the above

B. Vernistats

C. Resolvers

D. Microsyns

84. The phase lag produced by transportation relays_____________?
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A. is independent of frequency

B. decreases linearly with frequency

C. increases linearly with frequency

D. is inversehproportional to frequency

85. An increase in gain, in most systems, leads to_____________?
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A. larger damping ratio

B. smaller damping ratio

C. constant damping ratio

D. none of the above

86. Transfer function of a system is used to calculate which of the following ?
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A. The order of the system

B. The output for any given input

C. The steady state gain

D. The time constant

87. On which of the following factors does the sensitivity of a closed loop system to gain changes and load disturbances depend ?
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A. All of the above

B. Forward gain

C. Loop gain

D. Frequency

88. With feed back __________ reduces?
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A. system gain

B. system stability and gain

C. system stability

D. none of the above

89. The position and velocity errors of a type-2 system are_____________?
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A. zero, zero

B. zero, constant

C. constant, infinity

D. constant, constant

90. Which of the following is the definition of proportional band of a controller ?
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A. The range of measured variables through which the air output changes from maximum to minimum

B. The range of measured variables from set value

C. None of the above

D. Any of the above

E. The range of air output as measured variable varies from maximum to minimum

91. Which of the following can be measured by the use of a tachogenerator ?
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A. Speed and acceleration

B. Speed

C. None of the above

D. Displacement

E. Acceleration

92. In closed loop control system, with positive value of feedback gain the overall gain of the system will______________?
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A. be unaffected

B. decrease

C. increase

D. any of the above

93. A control system in which the control action is somehow dependent on the output is known as____________?
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A. None of the above

B. Semiclosed loop system

C. Open system

D. Closed loop system

94. For open control system which of the following statements is incorrect ?
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A. Errors are caused by disturbances

B. Recalibration is not required for maintaining the required quality of the output

C. Construction is simple and maintenance easy

D. Less expensive

95. In a control system the output of the controller is given to_____________?
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A. none of the above

B. amplifier

C. final control element

D. sensor

E. comparator

96. The frequency and time domain are related through which of the following ?
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A. Either B. or C.

B. Laplace Transform and Fourier Integral

C. Fourier Integral

D. Laplace Transform

97. A phase lag lead network introduces in the output_______________?
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A. none of the above

B. lag at all frequencies

C. lag at low frequencies and lead at high frequencies

D. lag at high frequencies and lead at low frequencies

98. In electrical-pneumatic system analogy the current is considered analogous to_____________?
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A. velocity

B. pressure

C. air flow rate

D. air flow

99. _______________is an open loop control system?
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A. Field controlled D.C. motor

B. Ward Leonard control

C. Stroboscope

D. Metadyne

100. A differentiator is usually not a part of a control system because it______________?
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A. reduces damping

B. increases input noise

C. reduces the gain margin

D. increases error

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