Closed-Loop Control System - IES Academy
Closed-Loop Control System - IES Academy
Closed-Loop Control System - IES Academy
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India’s No 1<br />
<strong>Control</strong> <strong>System</strong><br />
<strong>IES</strong> <strong>Academy</strong> Chapter 1<br />
1. Accuracy cannot be obtained by adjusting loop gain.<br />
2. Feedback decreases overall gain.<br />
3. Introduction of noise due to sensor reduces overall accuracy.<br />
4. Introduction of feedback may lead to the possibility of instability of<br />
closed loop system.<br />
Which of the statements given above are correct<br />
(a) 1, 2, 3 and 4 (b) Only 1, 2 and 4<br />
(c) Only 1 and 3 (d) Only 2, 3 and 4<br />
<strong>IES</strong>-5. A negative-feedback closed-loop system is supplied to an input of 5V.<br />
The system has a forward gain of 1 and a feedback gain of a 1. What is<br />
the output voltage<br />
[<strong>IES</strong>-2009]<br />
(a) 1.0 V (b) 1.5 V (c) 2.0 V (d) 2.5 V<br />
Basic Laplace Transform Theorem<br />
ω<br />
<strong>IES</strong>-6. Consider the function F(s) = where F(s) is the Laplace transform<br />
2 2<br />
s + ω<br />
of f(t). What is the steady-state value of f(t) <br />
[<strong>IES</strong>-2009]<br />
(a) Zero (b) One (c) Two (d) A value between -1 and +1<br />
<strong>IES</strong>-7.<br />
The transfer function of a linear-time-invariant system is given as<br />
1<br />
. What is the steady-state value of the unit-impulse response<br />
( s + 1)<br />
[<strong>IES</strong>-2009]<br />
(a) Zero (b) One (c) Two (d) Infinite<br />
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