Automatic Control Systems - Section 1 (4)
Automatic Control Systems - Section 1
| 25. | Consider the systems with following open loop transfer functions If unity feedback is used, the increasing order of time taken for unit step response to settle is |
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Answer: Option C Explanation: |
For the three systems the values of ξωn are 1.8, 2.5 and 2 respectively.| 26. | Assertion (A): The steady state response, of a stable, linear, time invariant system, to sinusoidal input depends on initial conditions. Reason (R): Frequency response, in steady state, is obtained by replacing s in the transfer function by jω |
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Answer: Option D Explanation: Steady state response does not depend on initial conditions. |
| 27. | Bellows converts |
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Answer: Option A Explanation: To measure pressure, it is convenient to convert pressure into displacement and then use a displacement transducer. |
| 28. | A unity feedback system has open loop transfer function |
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The closed loop transfer function is
| 29. | In the given figure, of potentiometer V0 = Vi (R0/Ri) only when |
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Answer: Option B Explanation: If RL is not infinite, the voltage ratio of potentiometer depends on the value of RL. This is called loading effect. |
| 30. | In the given figure the input frequency is such that R << Xc, then |
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Answer: Option A Explanation: Voltage across capacitor lags by 90°. |
| 31. | A system has its two poles on the negative real axis and one pair of poles lies on jω axis. The system is |
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Answer: Option C Explanation: Poles on j x-axis lead to oscillations. |
