Electrical control systems

21. A control system working under unknown random actions is called

Computer control system
Digital data system
Stochastic control system
Adaptive control system

Detailed SolutionA control system working under unknown random actions is called

22. The phase lag produced by transportation relays

Is independent of frequency
Is inversely proportional to frequency
Increases linearly with frequency
Decreases linearly with frequency

Detailed SolutionThe phase lag produced by transportation relays

23. The output of a feedback control system must be a function of

reference and output
reference and input
input and feedback signal
output and feedback signal

Detailed SolutionThe output of a feedback control system must be a function of

24. Which of the following devices are commonly used as error detectors in instruments ?

Vernistats
Microsyns
Resolvers
Any of the above

Detailed SolutionWhich of the following devices are commonly used as error detectors in instruments ?

25. A control system with excessive noise, is likely to suffer from

saturation in amplifying stages
loss of gain
vibrations
oscillations

Detailed SolutionA control system with excessive noise, is likely to suffer from

26. In open loop system

the control action depends on the size of the system
the control action depends on system variables
the control action depends on the input signal
the control action is independent of the output

Detailed SolutionIn open loop system

27. An automatic toaster is a ______ loop control system.

open
closed
partially closed
any of the above

Detailed SolutionAn automatic toaster is a ______ loop control system.

28. In liquid level and electrical system analogy, voltage is considered analogous to

head
liquid flow
liquid flow rate
none of the above

Detailed SolutionIn liquid level and electrical system analogy, voltage is considered analogous to

29. Is not a final control element.

Control valve
Potentiometer
Electropneumatic converter
Servomotor

Detailed SolutionIs not a final control element.

30. If the gain of the critical damped system is increased it will behave as

oscillatory
critically damped
overdamped
underdamped E. none of the above

Detailed SolutionIf the gain of the critical damped system is increased it will behave as

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