Biju Patnaik University of Technology 2008-6th Sem B.Tech (B Tech),ester control system engineering . - Question Paper
BPUT(B Tech),6th semester control system engineering ques. paper. Total number of printed pages - 7 B.Tech Si*lh Semester Examination - 2008 CONTROL SYSTEM ENGINEERING Full Marks-70
Time: 3 Hours Answer Question No 1 which is compulsory
IWL and any live from the rest.
Tho figures io th& right-hdnd margin indicate marks,
l, Answer the following questions; 2 *10
(a) Whal are the effects ol nagative feedback conirol on time constant and bandwidth ol a system ?
(b) What are Ihe time response specifications ?
(c) Draw the Bode plot for a Proportional-Integral controller, What are the effects of integral control action ?
(d) Explain the effects of adding a zero to a second order system.
(e) What is a phase-lead conn pen sator and why is it used ?
(fj Explain gain margin and phase margin,
(g) What is Nrchors chart ?
(h) Distinguish between a minimum phase
and a non-minimum phase system, IWL
(i) How does an AC tachometer work ?
G) Sketch the polar plots for:
1
G(s)H(s) = ---
w w 1+sT
2. (a) Explain the construction and principle of operation of an amplidyne. 4
(b) Obtain the transfer function, of the
cascaded R-C circuit shown in Fig. 1,
6
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{Figure 1)
(a) Discuss the construction, principle of operation, characteristics and modeling of a two phase servo motor. 5
(b) Draw the signal flow graph for the circuit shown in Fig, 2 and determine V(s)/I (s). 5
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4. (a) Tfie open-loop transfef function of a unity feedback control system is given by
K
G(s) " f7+2)(s + 4)(s* + 6s + 25)
By applying the Routh criterion, discuss the stability of the dosed-loop system as a function of K. Determine the values of K which will cause sustained oscillations in the closed loop system. Whal is the corresponding oscillation frequency ? 5
(b) (i) If the derivative feedback is absent (K0 * 0) in the closed loop system shown in Fig. 3, determine the damping factor and natural frequency of the system. What is the steady-state error resulting from unit-ramp input ? 2.5
(ii) Determine the derivative feedback constant KQ1 which will increase the damping factor of the system to 0.6, What is the steady-state error resulting from unit-ramp input with this setting of the derivative feedback constant ? 2.5
5* Draw the Bode diagram for:
100(1 +0.02 s)
G(S = (1 + s){1+0.1s)(l + 0.01 s)2
Determine the following from the Bode
IWL
Diagram :
(a) the gain cross over frequency
(b) the phase cross over frequency
(c) the gain margin
(d) the phase margin
Is the system stable ?
6. {a) Sketch the root locus plot of a unity feedback system with forward path gain, _ K 2
G<S) " s(S + 2)(s + 4)
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(b) Using Nyquist stability criterion determine Ihe stability of system with : 10(s + 3) (i) G[s)H(s). 5+3 8. (s+2) (ii) G(s) H(s) - (S+1)(S-1) (a) Using block diagram reduction technique in Fig, 4, determine Cl/R1 and C/R assuming R2 = 0. 1. 5 |
(b) Explain the effects of the different controller gains of a RID controller on the system's performance from the basic equations of the PID controller. 5 (a) Explain the different generalised error coefficients. 5 (b) What is BtBO stability of a system ? State the condition and derive it. 5 |
CPEE 5302 Contd. 6 CPEE 5302
(Figure 4)
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Attachment: |
| Earning: Approval pending. |
