CONTROL SYSTEMS QUIZ

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

2∠90°

1∠0°

0.5∠0°

0.5∠10°

TRUE ANSWER : ?
YOUR ANSWER : ?

Find the angles of asymptotes of the open loop transfer function G(s) = k(s + 1)/((s(s+2)(s+4)?

90°,270°

0°, 180°

60°,240°

90°,180°

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Find the conditions for the system to be stable?

Gain margin and phase margins are negative

Gain margin and phase margins are positive

Gain margin is positive but phase margin is negative

Gain margin is negative but phase margin is positive

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A proportional plus derivative controller

has high sensitivity

improves the steady state accuracy

both 1 and 2

increases the stability of the system

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The characteristic equation for closed loop system is given as . The value of k for which the system becomes just stable is

2

4

8

6

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The system having characteristic equation is used to be an oscillator. What is the value of k?

4

3

2

1

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YOUR ANSWER : ?

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

e-as*F(s)

F(s)/(s+a)

eas*F(s)

F(s+a)

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YOUR ANSWER : ?

A open loop transfer function is given as G(s) = (s+2)/(s+1)(s-1). Find the number of encirclements about '-1+j0'?

0

1

3

2

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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

5

0

2

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The compensator would provide a maximum phase shift of

30o.

20o.

60o.

45o.

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