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Control Systems

Control Systems
When the system gain is doubled the gain margin becomes?

 2 times
 Remains unaffected
 1/2 times
None of these

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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)
 c(t).u(t-1)
 c(t-1).u(t-1)

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Control Systems
Electrical analogous element for damper element (force-voltage analogy) in mechanical translation system is

 inductor
 capacitor
 resistor
 any of the above

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Control Systems
The characteristic equation of a feedback control system is given by s³ + 5s² + (k + 6)s + k = 0. In the root loci diagram, the asymptotes of the root loci for large 'k' meet at a point in the s-plane whose coordinates are

 (-2,0)
 (2,0)
 (1,0)
 (-1,0)

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Control Systems
A system is stable for (where GM = Gain Margin and PM = Phase Margin):

 GM and PM both +ve.
 GM -ve.
 PM - ve.
 GM and PM both -ve.

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Control Systems
If a body has identical properties all over, it is known as

 isotropic.
 elastic.
 none of them.
 homogeneous.

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