CONTROL SYSTEMS QUIZ

Time taken for the response to rise from zero to 100 % for very first time is called

Delay time.

Settling time.

Peak time.

Rise time.

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Find the conditions for the system to be stable?

Gain margin and phase margins are positive

Gain margin and phase margins are negative

Gain margin is positive but phase margin is negative

Gain margin is negative but phase margin is positive

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Given a unity feedback system with G(s) = k/s(s+4), the value of k for damping ratio of 0.5 is

1

64

4

16

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Which of the following is/are the example of actuator?

All

Hydraulic motor

Electric motor

Pneumatic motor

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The transfer function of a plant is T(s) = 5/(s+5)(s² + 5 + 1). The second order approximation of T(s) using dominant pole concept is

5/(s² + 5 + 1)

1/(s² + 5 + 1)

5/(s+1)(s+5)

1/(s+1)(s+5)

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Which of the following is/are the disadvantages of an open loop control system?

None of these

both 1 and 2.

Inaccurate.

Unreliable.

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The transfer function of a phase lead compensator is given by: G(s) = (1 + 3Ts)/(1 + Ts) where T>0. What is the maximum phase shift provided by such a compensator?

30°

90°

45°

60°

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The characteristic equation of a control system is give by s(s + 4)(s² + 2s + 1) + k(s + 1) = 0. Find the angle between the asymptotes?

120°

60°

180°

360°

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Which of the following controller is also known as anticipatory controller?

derivative controller

proportional controller

integral controller

both 1 and 3

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The maximum phase lag occurs at the ------------------- of the two corner frequencies?

geometric mean

arithmetic mean

None of these

either 1 or 2

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