CONTROL SYSTEMS QUIZ

An open loop control system, represented by the transfer function G ( s ) = ( s - 1 ) / ( s + 2 )( s + 3 ), is

stable and of the non-minimum phase type.

unstable and of the non minimum phase type .

unstable and of the minimum phase type.

stable and of the minimum phase type.

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Sparking between the contacts can be reduced by inserting

a reactor in the line.

a resistor in the line.

a capacitor in series with the contacts.

a capacitor in parallel with the contacts.

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The system is initially critical damped. If the gain of the system is doubled, then it will exhibit

under damped characteristics.

critical damped characteristics.

over damped characteristics.

undamped characteristics.

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For a unity feedback control system open loop transfer function then velocity error constant is

infinity.

0.

50.

10.

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The type of a control system is obtained from -------------- transfer function?

open loop

closed loop

both open loop and closed loop

none of above.

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The transfer function of a system is 10/(1 + S) when operated as a unity feedback system, the steady state error to a unit step input will be

¾.

Zero.

1/11.

10.

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Certain control system has input u(t) and output c(t). If the input is first passed through a block having transfer function e-s and unit gain is applied to the applied to the system. The modified output will be

c(t-1).u(t)

c(t-1).u(t-1)

c(t)u(t)

c(t).u(t-1)

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Given the Laplace transform of f(t) = F(s), the Laplace transform of (f(t)e-at) is equal to

F(s+a)

eas*F(s)

e-as*F(s)

F(s)/(s+a)

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The compensator would provide a maximum phase shift of

20o.

60o.

45o.

30o.

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In a control system, an integrator is represented by

s.

1 / s.

s2.

1 / s2.

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