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Control Systems
Frequency Domain Analysis
Frequency Response

Questions mapped to Frequency Response under Frequency Domain Analysis.

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Q#1 Frequency Domain Analysis GATE EE 2022 (Set 1) MCQ +1 mark -0.33 marks

The transfer function of a real system, H(s), is given as:

where A, B, C and D are positive constants. This system cannot operate as

low pass filter.

high pass filter.

band pass filter.

an integrator.

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Q#2 Frequency Domain Analysis GATE EE 2022 (Set 1) MCQ +2 marks -0.66 marks

An LTI system is shown in the figure where G(s) . The steady state output of the system, to the input r(t), is given as  The values of a and b will be         

Diagram

Description automatically generated

a = 1, b = 10

a = 10, b = 1

a = 1, b = 100

a = 100, b = 1

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Q#3 Frequency Domain Analysis GATE EE 2021 (Set 1) NAT +1 mark -0 marks

A signal generator having a source resistance of . is set to generate a 1 kHz sinewave. Open circuit terminal voltage is 10 V peak-to-peak. Connecting a capacitor across the terminals reduces the voltage to 8 V peak-to-peak. The value of this capacitor is ________ . (Round off to 2 decimal places.)

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Q#4 Frequency Domain Analysis GATE EE 2020 (Set 1) MCQ +2 marks -0.66 marks

A stable real linear time-invariant system with single pole at p, has a transfer function  with a dc gain of 5. The smallest positive frequency, in rad/s, at unity gain is closest to:

8.84

11.08

78.13

122.87

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Q#5 Frequency Domain Analysis GATE EE 2017 (Set 1) MCQ +1 mark -0.33 marks

The transfer function of a system is given by, . Let the output of the system be  for the input, . Then the minimum and maximum values of  (in radians) are respectively

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Q#6 Frequency Domain Analysis GATE EE 2016 (Set 1) MCQ +1 mark -0.33 marks

The transfer function of a system is . The steady state output y(t) is A  for the input . The value of A and , respectively are

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Q#7 Frequency Domain Analysis GATE EE 2016 (Set 1) MCQ +1 mark -0.33 marks

The phase cross-over frequency of the transfer function  in rad/s is

3

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Q#8 Frequency Domain Analysis GATE EE 2016 (Set 2) NAT +1 mark -0 marks

Consider a linear time-invariant system with transfer function                

If the input is cos(t) and the steady output is  , then the value of A is___________.

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Q#9 Frequency Domain Analysis GATE EE 2015 (Set 1) MCQ +2 marks -0.66 marks

The transfer function of a second order real system with a perfectly flat magnitude response of unity has a pole at

(2 – j3). List all the poles and zeroes.

Poles at (2 ± j3), no zeroes.

Poles at (±2 – j3), one zero at origin.

Poles at (2 – j3), (-2 + j3), zeroes at (-2 – j3), zeroes at (-2 – j3), (2 + j3)

Poles at (2 ± j3), zeroes at (-2 ± j3).

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Q#10 Frequency Domain Analysis GATE EE 2012 (Set 1) MCQ +1 mark -0.33 marks

A system with transfer function

is excited by .  The steady state output of the system is zero at

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Q#11 Frequency Domain Analysis GATE EE 2005 (Set 1) MCQ +1 mark -0.33 marks

A system with zero initial conditions has the closed loop transfer function. The system output is zero at the frequency

0.5 rad/sec

1 rad/sec

2 rad/sec

4 rad/sec

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Q#12 Frequency Domain Analysis GATE EE 2004 (Set 1) MCQ +2 marks -0.66 marks

In the system shown in figure, the input x(t)=sin t. In the steady-state, the response y(t) will be

Q76.jpg

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Q#13 Frequency Domain Analysis GATE EE 1997 (Set 1) MCQ +2 marks -0.66 marks

Determine the transfer function of the system having the following state variable representation:         

          

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Q#14 Frequency Domain Analysis GATE EE 1996 (Set 1) MCQ +1 mark -0.33 marks

The closed-loop transfer function of a control system is given by . For the input , the steady state value of c(t) is equal to

1

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Q#15 Frequency Domain Analysis GATE EE 1995 (Set 1) MSQ +2 marks -0 marks

The block diagram of the control system is given in the figure.  

F:\Volume-2 deepak work\08.jpg

Nyquist locus


Untitled-11.png

Phase cross-over frequency = 4.472 rad/sec

For K=1.2, phase margin = 0

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Q#16 Frequency Domain Analysis GATE EE 1991 (Set 1) MSQ +2 marks -0 marks

An underdamped second-order system having a transfer function of the form has a frequency response plot shown in the figure. Then the system gain K is _______________ and the damping factor is approximately ___________________.

System gain K = 2

 Damping factor

System gain K = 1

Damping factor

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