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Control Systems

Control Systems
For a unity feedback control system open loop transfer function then acceleration error constant is

 0.
 infinity.
 50.
 20.

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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?

 4 sec
 5 sec
 6 sec
 2 sec

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Control Systems
The transfer function of the system described by d²/dt²(y(t)) + 3d/dt(y(t)) + 2y(t) = 5u(t) with u(t) as input and y(t) as output is

 5/s(s²+3s+2)
 s(s²+3s+2)/5
 (s²+3s+2)/5
 5/(s²+3s+2)

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

 1
 0
 3
 2

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Control Systems
Number of roots in left hand half of s plane if characteristic equation is s3 - 4s2 + s + 6 = 0 ?

 0.
 2.
 3.
 1.

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Control Systems
Sparking between the contacts can be reduced by inserting

 a resistor in the line.
 a reactor in the line.
  a capacitor in parallel with the contacts.
 a capacitor in series with the contacts.

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