CONTROL SYSTEMS QUIZ

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

1.386.

0.693.

0.500.

2.000.

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A transfer function has a zero at s = -1 and poles at s = -1 ± j1. The multiplier being unity, if the input is step function, the steady state response is given by

1∠0°

2∠90°

0.5∠10°

0.5∠0°

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Which of the following controller has sluggish response?

integral controller

both 2 and 3

proportional controller

derivative controller

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Negative feedback in a closed loop control system

All of these

reduces sensitivity to parameter variation.

improves disturbance rejection.

reduces gain.

TRUE ANSWER : ?
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Lead network is used to

improve steady state response.

both A and C.

increase bandwidth.

improve transient response.

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YOUR ANSWER : ?

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+j,-2-j

-2,-2

-2,2

-2,-1

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A function of one or more variables which conveys information about the nature of physical phenomenon is called

system.

noise.

interference.

signal.

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A controller transfer function is given by . What is its nature and parameter?

lead compensator, α = 0.2

lag compensator, β = 2

lead compensator, α = 0.1

lag compensator, β = 10

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Open loop transfer function,

band stop filter.

band reject filter.

all pass filter.

None of these

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

both 1 and 2

outgoing branches

incoming branches

None of these

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YOUR ANSWER : ?

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