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Control Systems

Control Systems
What is the order of a closed loop control system for a plant with a transfer function equal to G(s) = k/s²(1+Ts) and with unity feedback

 1
 3
 2
 0

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Control Systems
Settling time for 5% tolerance band is -------------

 5T.
 4T.
 3T.
 2T.

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Control Systems
Certain control system has input u(t) and output c(t). If the input is first passed through a block having transfer function e-s and unit gain is applied to the applied to the system. The modified output will be

 c(t-1).u(t-1)
 c(t-1).u(t)
 c(t)u(t)
 c(t).u(t-1)

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Control Systems
For a second order under damped system subjected to unit step input the time response has first peak value to be 4 times the second over shoot. Determine the damping ratio ξ ?

 0.707
 0.087
 0.07
 0.87

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Control Systems
A unity feed back system has forward transfer function The range of k for the system to be stable is

 0 < k < 390.
None of these
 0 < k < 39.
 0 < k < 3900.

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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
 0.25 and 2 rad/s
 0.50 and 2 rad/s

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