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Control Systems

Control Systems
For the polynomial , find the number of roots which lie on the right half of s-plane?

 0
 1
 4
 2

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Control Systems
When the input to a system was with drawn at t = 0, its output was found to decrease exponentially from 1000 units to 500 units in 1.386 sec. The time constant of the system is

 0.693.
 2.000.
 0.500.
 1.386.

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

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Control Systems
Open loop transfer function,

None of these
 band stop filter.
 band reject filter.
 all pass filter.

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Control Systems
Find the corner frequency for the following transfer function? G(s) = 1/(s+2)

 1/2 rad/s
 2 rad/s
 4 rad/s
 1/4 rad/s

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Control Systems
The optimum values of damping ratio is --------------

 0 to 2
 0.9 to 1.1
 0.3 to 0.7
 0.3 to 5

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