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Control Systems

Control Systems
The unit step error coefficient of a system with unity feedback is

 1/6.
 0.
 1.
 infinity.

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Control Systems
The closed loop transfer function of a unity feedback control system is 9/(s² + 3s + 9), then the type of the system is

 0
 2
 1
 3

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Control Systems
Force balancing equation of a dash-pot element is (where, x = displacement)

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

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

 50.
 0.
 infinity.
 20.

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Control Systems
In signal flow graph output node is node having only------------

 outgoing branches
None of these
 incoming branches
 both 1 and 2

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Control Systems
The transfer function of a plant is T(s) = 5/(s+5)(s² + 5 + 1). The second order approximation of T(s) using dominant pole concept is

 5/(s² + 5 + 1)
 1/(s² + 5 + 1)
 5/(s+1)(s+5)
 1/(s+1)(s+5)

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