CONTROL SYSTEMS QUIZ

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

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

e-3t u(t).

non of above.

e6t.

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Consider the function F(s) = ω/(s²+ω²). Where F(s) = Laplace transform of f(t). The final value of f(t) is equal to

infinite

zero

finite constant

a value between -1 and +1

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The open loop transfer function for unity feedback system is given by Find the steady state error for a ramp input of magnitude 10?

infinite

0

5

2

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Transient response is improved in case of

none of these.

lead network.

both A and B.

lag network.

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With regard to filtering property, the lead compensator is

band reject filter

bandpass filter

high pass filter

low pass filter

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The device necessarily used for automatic temperature control in a furnace is

Any of above.

Thermocouple.

Auto-transformer.

Thermostat.

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The unit step response of the system is 1 - e-t(1+t). Which is the system?

oscillatory

critically stable

unstable

stable

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A unity feedback control system has forward loop transfer function as e-Ts/s(s+1). Its phase value will be zero at frequency ω1. Which of the following equations should be satisfied by ω1?

Tω1 = cot(ω1)

ω1 = cot(Tω1)

ω1 = tan(Tω1)

Tω1 = tan(ω1)

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

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

each system in the cascade is individually caused and unstable.

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

the majority are unstable and the majority are causal.

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Negative feedback in a closed loop control system

improves disturbance rejection.

All of these

reduces sensitivity to parameter variation.

reduces gain.

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