Q. The open loop transfer function of a system is K/s(Js+F). If the frequency at the intersection of - 40 dB/decade line and 0 dB line is ω, then

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Q. For low frequencies such that ω << 1/T , the log magnitude of factor 1/(1+jωT) is 0 dB.

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Q. Assertion (A): The closeness of G(jω) locus to (- 1 + j0) point can be used as a measured of margin of stability.

Reason (R): When the G(jω) locus comes close to encircling (- 1 + j0) point the system becomes oscillatory.

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Q. The capacitance of a gas pressure vessel is defined as

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Q. Assertion (A): Integral control action is sometimes called reset control.

Reason (R): Reset rate is expressed as number of repeats per unit time.

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Q. In some on-off controllers a differential gap is provided

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Q. If G(s) = 1/(s³+s²+1), there are

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Q. In Bode analysis the correction at corner frequency is 3 dB.

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Q. In a proportional plus integral control action

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Q. Which dc servomotor has minimum inertia?

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Q. Gas flow resistance is defined as

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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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