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Control Systems

Control Systems
For a unity feedback control system open loop transfer function then position error constant is

 20.
 40.
 0.
 infinity.

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Control Systems
In polar plots if the critical point '-1+j0' is enclosed then the system is --------

 unstable
 marginally stable
 stable
 critical stable

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Control Systems
The device necessarily used for automatic temperature control in a furnace is

 Any of above.
 Thermocouple.
 Thermostat.
 Auto-transformer.

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Control Systems
The closed loop transfer function of a system is 25/(s² + 25). The settling time of the system is

 5 sec
 25 sec
 ∞ sec
 1 sec

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Control Systems
A second order control system is defined by the following equation: 4 d²c(t)/dt² + 8 dc(t)/dt + 16 c(t) = 16 u(t) The damping ratio and natural frequency for this system are respectively

 0.50 and 4 rad/s
 0.25 and 4 rad/s
 0.50 and 2 rad/s
 0.25 and 2 rad/s

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Control Systems
The transfer function of a system is given as below, if a = 0.1, then the steady state error to unity ramp input will be

 0.16.
 0.35.
 0.25.
 0.49.

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