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Control Systems

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

 1.
 0.
 infinity.
 1/6.

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Control Systems
A proportional plus derivative controller

 increases the stability of the system
 has high sensitivity
 improves the steady state accuracy
 both 1 and 2

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Control Systems
The open loop transfer function of a unity feedback system is given by G(s) = 1/(s+2)². The closed loop transfer function will have poles at

 -2,-1
 -2+j,-2-j
 -2,2
 -2,-2

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Control Systems
If two blocks having gains A and B respectively are in parallel connection, find the resultant gain using block diagram reduction technique?

 A*B
 A+B
 A/B
 2(A+B)

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

 2
 1
 3
 0

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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 the gain k is increased to infinity, then damping ratio will tend to become

 unity
 0.707
 zero
 infinite

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