71. A control system working under unknown random actions is called
72. From which of the following transfer function can be obtained ?
73. Which of the following devices is used for conversion of co-ordinates ?
74. Which of the following is an open loop control system ?
75. Which of the following is exhibited by Root locus diagrams ?
76. Which of the following devices are commonly used as error detectors in instruments ?
77. Which of the following statements is not necessarily correct for open control system ?
78. The on-off controller is a _____ system.
79. A controller, essentially, is a
80. The phase lag produced by transportation relays
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