Q. Examine the following statements

1. A small size hydraulic actuator can develop good torque.
2. It is easy to maintain a hydraulic system leak proof.
3. Both linear and rotatary hydraulic actuators are available.
4. Hydraulic power is more easily available than electric power.

Which of the above statements are correct?

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Q. Consider the following statements regarding negative feedback

1. It increases system gain
2. It improves sensitivity
3. It improves system stability

Which of these are not correct?

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Q. Which of the following are applications of position control systems?

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Q. Assertion (A): Increasing the system gain improves steady state behaviour but may result in instability.

Reason (R): A compensator is inserted into a system to ensure specified performance.

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Q. Assertion (A): Inverse Laplace transform can be found from P(s) by inversion integral.

Reason (R): The function f(t) is assumed to be zero for t < 0.

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Q. Assertion (A): Derivative control action is also called rate control and has an anticipatory character.

Reason (R): Derivative control amplifies noise signals.

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Q. Assertion (A): When a PID controller is added to a system, the peak overshoot to step input cannot be determined easily.

Reason (R): Use of PID controller introduces a zero in the forward path.

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Q. The slope of log magnitude asymptote changes by - 40 dB/ decade at a certain frequency and the error between asymptote and actual curve is - 6 dB. This means that

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Q. Friction forces acts in a direction

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Q. For a second order system delay time td is the time required to reach

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Q. Coulomb friction is

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Q. The damping ratio of a pair of complex poles when expressed in terms of angle θ measured from jω axis equal to

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Q. The slope of log magnitude curve changes by - 40 dB/decade at a certain frequency and the error between asymptote and actual curve is positive. This means that

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Q. A system has high gain and phase margin. The system is

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Q. A proportional controller is basically

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Q. Nyquist stability criterion is based on a theorem from the theory of complex variables.

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Q. For the function G(s) H(s) = 1/s(s+1)(s+0.5) the phase cross-over frequency is

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Q. While forming Routh's array, the situation of a row of zeros indicates that the system

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Q. Assertion (A): In liquid system the ratio of change in liquid level to change in flow rate is called resistance of liquid flow.

Reason (R): In liquid level systems the ratio of change in liquid stored in a tank to the change in head is called capacitance of tank.

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Q. Assertion (A): When the performance of a stable second order system is improved by a PID controller, the system may become unstable.

Reason (R): PID controller increases the order of the system to 3.

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