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JNTU B.Tech III CONTROL SYSTEMS Previous Question Paper (May/June - 2019 - R13)

B.Tech | III | III-I | R13 | May/June - 2019

Answer PaperPaper Code: 115ADMaximum Marks: 75Time: 3 hours

Note: This question paper contains two parts A and B. Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks.

Part A

125 marks

What is the effect of positive feedback on stability?

2 marks

Answer

Positive feedback generally tends to decrease the stability of a system. It can lead to oscillations or even instability if the feedback gain is too high.

Define Transfer Function. What are the limitations of transfer function

3 marks

Answer

The Transfer Function of a system is defined as the ratio of the Laplace transform of the output to the Laplace transform of the input, assuming all initial conditions are zero.

Limitations of Transfer Function:

It is applicable only to Linear Time-Invariant (LTI) systems.
It does not account for initial conditions.
It does not provide information about the internal states or structure of the system.
It assumes that the system is causal and can be represented by a rational function.

Write the Mason’s gain formula.

2 marks

Answer

Compare the AC and DC servomotors.

3 marks

Answer

What is steady state error?

2 marks

Answer

Distinguish between type and order of a system.

3 marks

Answer

What is Routh stability criterion

2 marks

Answer

Define angle of departure and angle of arrival in root locus

3 marks

Answer

Define gain-cross over frequency and phase-cross over frequency

2 marks

Answer

What are the advantages of bode plot?

3 marks

Answer

Part B

210 marks

Mention the merits and demerits of an open-loop and closed-loop control systems.

5 marks

Answer

Obtain the transfer function of the following system and draw its analogous electrical circuit (Figure 1).

5 marks

Answer

310 marks

Find the transfer function for the following system shown in figure 2.

5 marks

Answer

Explain the classification of control systems.

5 marks

Answer

410 marks

Explain synchro with neat sketch.

5 marks

Answer

Determine the transfer function for the following block diagram shown in figure 3.

5 marks

Answer

510 marks

Explain the properties of signal flow graphs.

5 marks

Answer

Derive the transfer function of an a.c. servomotor and draw its characteristics.

5 marks

Answer

610 marks

Consider the unit step response of a unity feedback control system whose OLTF is

G(s)= 1 / s(s+1)

. Obtain the rise time, peak time, maximum overshoot and settling time.

5 marks

Answer

For a first order system, find out the output of the system when the input applied to the system is unit ramp input? Sketch the r(t) and c(t).

5 marks

Answer

710 marks

Find the Error coefficients for step, ramp and parabolic inputs for unity feed-back System having the forward transfer function

G(s) = 14(s+3) / s(s^2+2s+2)(s+5)

5 marks

Answer

Find out the output of the critically damped second order system when the input applied to the system is unit step input.

5 marks

Answer

810 marks

The open loop transfer function of a control system is given by

G(s)H(s)= k / s(s+6)(s^2+4s+13)

determine i) The breakaway points ii) The angle of departure from complex poles iii) The stability condition

5 marks

Answer

How many roots of the following polynomial are in the right half, left half of s-plane and on the jω axis.

P(s)=s^5+2s^4+2s^3+4s^2+s+2 = 0

5 marks

Answer

Draw the root locus for the unity feedback system whose open loop transfer function is

G(s) = k(s+1) / (s-1)(s+2)(s+4)

find the range of k for which the system is stable.

10 marks

Answer

1010 marks

What are the frequency domain specifications.

5 marks

Answer

Explain the procedure for determination of transfer function from Bode plots.

5 marks

Answer

Sketch the Bode plots for the system

G(s) = 25 / s(1+s)(1+0.1s)

Hence find gain cross over frequency and phase cross over frequency.

10 marks

JNTU B.Tech III CONTROL SYSTEMS Previous Question Paper (May/June - 2019 - R13)

Part A

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Part B

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