CONTROL SYSTEMS QUIZ

Which of the following is/are represents the lag compensator?

both 1 and 2

(s+2)/(s+1)

(s+5)/(s+6)

(s+2)/(s+5)

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

0

3

2

1

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Given the transfer function of a system. Which of the following characteristics does it have?

any of the above

Critical damped

Over damped

Under damped

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When the input to a system was with drawn at t = 0, its output was found to decrease exponentially from 1000 units to 500 units in 1.386 sec. The time constant of the system is

0.500.

2.000.

1.386.

0.693.

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Weighting function is in terms of -----------------

Laplace transform of the parabolic response

Laplace transform of the ramp response

Laplace transform of the step response

Laplace transform of the impulse response

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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

0.707

unity

zero

infinite

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The step response of the system described by the differential equation will be

e-3t u(t).

e6t.

(1/6)*(1-e-6t).

non of above.

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If the magnitude of G(jω)H(jω) at phase crossover frequency is 0.5. Find the gain margin of the given system?

2

1

0.5

4

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A cascade of three linear time invariant systems is causal and unstable. From this we conclude that

the majority are unstable and the majority are causal.

each system in the cascade is individually caused and unstable.

at least one system is unstable and at least one system is causal.

at least one system is causal and all systems are unstable.

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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

0.263

0.386

0.953

0.707

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