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Control Systems

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
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

 2.000.
 1.386.
 0.500.
 0.693.

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Control Systems
Number of sign changes in the entries in 1st column of Routh array denotes the no. of

 open loop zeroes in RHP.
 roots of characteristic polynomial in RHP.
 zeroes of system in RHP.
 open loop poles in RHP.

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Control Systems
Sparking between the contacts can be reduced by inserting

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

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Control Systems
The angle condition used for checking whether any point lies on root locus or not is...........

 ± (2q + 1) 360o.
 ± (2q) 360o.
 ± (2q + 1) 180o.
 ± (2q) 180o.

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Control Systems
The impulse response of a system is c(t) = -te-t + 2 e-t (t>0). Its closed loop transfer function is

 (2s+1)/s²
 (2s+2)/s²
 (2s+1)/(s+1)²
 (2s+2)/(s+1)²

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