control systems MCQs – Page 4

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

control systems Mcqs

61. By which of the following the control action is determined when a man walks along a path ?
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A. Brain

B. Eyes

C. Legs

D. Hands

62. In liquid level and electrical system analogy, voltage is considered analogous to_____________?
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A. none of the above

B. liquid flow

C. liquid flow rate

D. head

63. When the initial conditions of a system are specified to be zero it implies that the system is______________?
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A. working normally with zero reference input

B. working normally with reference input

C. at rest but stores energy

D. at rest without any energy stored in it

64. Addition of zeros in transfer function causes which of the following ?
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A. Lead-lag compensation

B. Lag-compensation

C. Lead-compensation

D. None of the above

65. In thermal-electrical analogy charge is considered analogous to_______________?
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A. none of the above

B. reciprocal of temperature

C. reciprocal of heat flow

D. heat flow

E. temperature

66. Which of the following is exhibited by Root locus diagrams ?
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A. The bandwidth of the system

B. The frequency response of a system

C. The poles of the transfer function for a set of parameter values

D. None of the above

E. The response of a system to a step input

67. In a stable control system backlash can cause which of the following ?
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A. Poor stability at reduced values of open loop gain

B. Underdamping

C. Overdamping

D. Low-level oscillations

68. Zero initial condition for a system means_______________?
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A. zero stored energy

B. system is at rest and no energy is stored in any of its components

C. input reference signal is zero

D. ne initial movement of moving parts

69. Any externally introduced signal affecting the controlled output is called a______________?
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A. stimulus

B. signal

C. feedback

D. gain control

70. Regenerative feedback implies feedback with_______________?
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A. negative sign

B. step input

C. positive sign

D. oscillations

71. In pneumatic control systems the control valve used as final control element converts____________?
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A. none of the above

B. electric signal to pressure signal

C. position change to pressure signal

D. pressure signal to electric signal

E. pressure signal to position change

72. In order to increase the damping of a badly underdamped system which of following compensators may be used ?
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A. Phase-lead

B. Phase-lag

C. Both A. and B.

D. Either A. and B.

E. None of the above

73. _____________is not a final control element?
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A. Servomotor

B. Electropneumatic converter

C. Potentiometer

D. Control valve

74. ____________technique is not applicable to nonlinear system ?
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A. Phase-plane representation

B. Nyquist Criterion

C. Quasi linearization

D. Functional analysis

75. A control system with excessive noise, is likely to suffer from_______________?
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A. loss of gain

B. saturation in amplifying stages

C. vibrations

D. oscillations

76. The output of a feedback control system must be a function of_________________?
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A. reference and output

B. reference and input

C. output and feedback signal

D. input and feedback signal

77. In an open loop control system____________?
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A. None of the above

B. Only system parameters have effect on the control output

C. Output is dependent on control input

D. Output is independent of control input

78. With feed back ____________ reduces?
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A. none of the above

B. system stability and gain

C. system stability

D. system gain

79. signal will become zero when the feedback signal and reference signs are equal?
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A. Feedback

B. Input

C. Actuating

D. Reference

80. A control system working under unknown random actions is called______________?
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A. adaptive control system

B. computer control system

C. stochastic control system

D. digital data system

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