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Control Systems

Control Systems
The unit step response of the system is 1 - e-t(1+t). Which is the system?

 oscillatory
 unstable
 critically stable
 stable

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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

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

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Control Systems
The impulse response of an initally relaxed linear system is e-2tu(t). To produce a response of te-2tu(t), the input must be equal to

 2e-tu(t).
 e-2tu(t).
 e-tu(t).
 (0.5)e-2tu(t).

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

 40.
 0.
 20.
 infinity.

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Control Systems
Electrical analogous quantity for dash-pot in force-current analogy is

 conductance.
 capacitance.
 resistance.
 inductance.

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

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