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Control-systems Questions Set 9:

Quiz Mode

The sensitivity of an open-loop system is

Infinite

None of these

Solution:

The output of the feedback control system must be a function of the _____

d) Reference output

a) Output

b) Input and feedback signal

c) Reference input

Solution:

Which combination of poles of a 3rd order system can approximate it to a 2nd order system?

s=-1, s=-2, s=-3

s=-1, s=-3, s=-5

s=-1, s=-2, s=-11

s=-1, s=-3, s=-14

Solution:

A ramp input applied to a unity feedback system results in 5% steady state error. the type number and zero frequency gain of the system are

1 and 20

0 and 20

0 and 1/20

1 and 1/20

Solution:

For a given unity feedback control system with the open-loop transfer function G(s) = K/(s(s+1)), the steady-state error of the system due to a unit step input is:

Zero

1/K

Infinite

Solution:

Assume that the cannon fires initially at exactly 5:00 p.m. We have a positive feedback system. Denote by ∆t the time lost per day, and the net time error by ET.

26 min

52 min

45 min

60 min

Solution:

Consider an LTI system, where the input is x(t). The required output of the system is 4x(t-2). What should be the transfer function (TF) of the system?

4e^(j4πf)

2e^(-j8πf)

4e^(-j4πf)

2e^(j8πf)

Solution:

If the closed-loop transfer function of a control system is given as T(s) = (s-5)/[(s+2)(s+3)], then it is:

An unstable system

An uncontrollable system

A minimum phase system

A non-minimum phase system

Solution:

Which of the following are the properties of the signal flow graph?

All 1., 2., and 3.

A signal flow graph is applicable to linear networks only.

Signals travel along the branches only in the marked direction and get multiplied by the gain of the branch.

The algebraic equations must be in the form of cause and effect.

Solution:

If the damping factor, Zeta, lies between the interval 0 < Zeta < 1, then the nature of the response and the system classification are respectively:

Damped oscillations, Underdamped systems

Oscillations with constant frequency and amplitude, Undamped system

Pure exponential, Critically damped

Pure exponential, slow and sluggish, Over damped

Control-systems Questions Set 9:

The sensitivity of an open-loop system is

Solution:

The output of the feedback control system must be a function of the _____

Solution:

Which combination of poles of a 3rd order system can approximate it to a 2nd order system?

Solution:

A ramp input applied to a unity feedback system results in 5% steady state error. the type number and zero frequency gain of the system are

Solution:

For a given unity feedback control system with the open-loop transfer function G(s) = K/(s(s+1)), the steady-state error of the system due to a unit step input is:

Solution:

Assume that the cannon fires initially at exactly 5:00 p.m. We have a positive feedback system. Denote by ∆t the time lost per day, and the net time error by ET.

Solution:

Consider an LTI system, where the input is x(t). The required output of the system is 4x(t-2). What should be the transfer function (TF) of the system?

Solution:

If the closed-loop transfer function of a control system is given as T(s) = (s-5)/[(s+2)(s+3)], then it is:

Solution:

Which of the following are the properties of the signal flow graph?

Solution:

If the damping factor, Zeta, lies between the interval 0 < Zeta < 1, then the nature of the response and the system classification are respectively:

Solution:

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