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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)u(t)
c(t).u(t-1)
c(t-1).u(t)
c(t-1).u(t-1)
c(t)u(t)
c(t).u(t-1)
c(t-1).u(t)
c(t-1).u(t-1)
Answer
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Related Question
Control Systems
A system has poles at 0.01 Hz, 1 Hz and 80 Hz; zeros at 5 Hz, 100 Hz and 200 Hz. The approximate phase of the system response at 20 Hz is
-90°
-180°
180°
90°
-90°
-180°
180°
90°
Answer
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Control Systems
When writing a transfer function which of the following loops are not valid loops?
Self loops at output node.
Self loops at input node.
Neither 1 nor 2.
Both 1 and 2.
Self loops at output node.
Self loops at input node.
Neither 1 nor 2.
Both 1 and 2.
Answer
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Control Systems
The input-output relationship of a linear time invariant continuous time system is given by r(t) = d²c(t)/dt² + 3 dc(t)/dt + 2 c(t) Where r(t) and c(t) are input and output respectively. What is the transfer function of the system equal to?
1/(s² + 3s + 2)
2/(s² + s + 2)
1/(s² + s + 2)
2/(s² + 3s + 2)
1/(s² + 3s + 2)
2/(s² + s + 2)
1/(s² + s + 2)
2/(s² + 3s + 2)
Answer
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Control Systems
The open loop transfer function of a unity feedback control system is given by G(s) = k/s(s+1). If gain k is increased to infinity, then damping ratio will tend to become
unity
infinite
0.707
zero
unity
infinite
0.707
zero
Answer
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Control Systems
The open loop transfer function of a unity feedback control system is G(s) = 1/((s(s+0.1s)(s+1)). The value of damping factor for which the resonant peek is equal to 1.4 is
0.953
0.386
0.707
0.263
0.953
0.386
0.707
0.263
Answer
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