CONTROL SYSTEMS QUIZ

The transfer function for tachometer E(S)/θ(S) is

K

KS2

KS

K/S

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The output of the system has an effect upon the input quantity, then the system is a

closed loop control system.

None of these

either 1 or 2.

open loop control system.

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A control system has open loop transfer function G(s) = k/(s(s + 2). Find the break away point?

2

1

-2

-1

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Find the conditions for the system to be stable?

Gain margin is positive but phase margin is negative

Gain margin is negative but phase margin is positive

Gain margin and phase margins are negative

Gain margin and phase margins are positive

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Name test signals used in time response analysis?

All of B, C, D.

Unit ramp.

Unit step.

Impulse.

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Transient state analysis deals with -------------

nature of response

magnitude of error

None of these

both 1 and 2

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

critically stable

oscillatory

stable

unstable

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Transfer function of a control system depends on

nature of input.

initial conditions of input and output.

system parameters alone.

nature of output.

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The transfer function of the system described by d²/dt²(y(t)) + 3d/dt(y(t)) + 2y(t) = 5u(t) with u(t) as input and y(t) as output is

5/(s²+3s+2)

5/s(s²+3s+2)

s(s²+3s+2)/5

(s²+3s+2)/5

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A second order under damped system has damping ratio of 0.3. Find the phase margin of the system?

3°

60°

20°

30°

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