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Control Systems

Control Systems
If a circuit consists of two mass elements, two spring elements and four friction elements. Find the order of transfer function?

 12
 4
 6
 2

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Control Systems
The value of 'a' in to give phase margin = 45o will be

 0.707.
 1.18.
 1.414.
 0.9.

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Control Systems
The error of a system to a ramp input is 1/5, if the type of the system is decreased by one, then the error of unit step input is

 6/5
 0.167
 0.2
 5

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

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Control Systems
A transfer function is given as The steady state sinusoidal response will become zero at a frequency response of

 4 rad/s
 3 rad/s
 2 rad/s
 9 rad/s

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Control Systems
A box which tells the effect of inputs on control sub system is known as

 State box.
 Decision box.
 Logical box.
 Data Box.

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