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Control Systems

Control Systems
What is the open loop DC gain of a unity feedback control system having closed loop transfer function as

 4/13
 13/4
 9/4
 4/9

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Control Systems
Force balancing equation for elastic element (K) is (where, x = displacement)

 K d2x/dt2
 K *x
 K dx/dt
None of these

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Control Systems
Angle condition for complimentary root locus or inverse root locus is

 ± (2q + 1) 360°
 ± (2q) 180°
 ± (2q) 360°
 ± (2q + 1) 180°

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Control Systems
The characteristic equation of a control system is give by s(s + 4)(s² + 2s + 1) + k(s + 1) = 0. Find the angle between the asymptotes?

 360°
 120°
 60°
 180°

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Control Systems
A first order control system is initially at 0 V and subjected to a sudden input at t=0. Its output reaches 1.1 V in 4 sec and eventually reaches steady state of 2 V. Find the time constant?

 2 sec
 5 sec
 6 sec
 4 sec

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Control Systems
Which of the following is/are the advantages of a closed loop control system?

 both 1 and 2.
 The closed loop systems are accurate.
 nether 1 nor 2.
 The closed loop systems are less affected by noise.

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