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Control Systems

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

 unity
 zero
 infinite
 0.707

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Control Systems
The transfer function of the control system depends on

 initial conditions of input and output.
 nature of the output.
 nature of the input.
 the system parameters alone.

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Control Systems
A box which tells the effect of inputs on control sub system is known as

 Logical box.
 State box.
 Data Box.
 Decision box.

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Control Systems
Consider the following statements for phase lead compensation:

 both 1 and 2
 nether 1 nor 2
 Phase lead compensation shifts the gain crossover frequency to the right
 The maximum phase lag occurs at the arithmetic mean of the two corner frequencies.

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Control Systems
Which one of the following is the response y(t) of a casual LTI system described by H(s) = (s+1)/(s²+2s+2) for a given input x(t) = e-t u(t)?

 e-t tant*u(t)
 e-t sint*u(t)
 e-t cost*u(t)
 e-t cott*u(t)

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