Model Question Paper
Time : 3 hrs
BSAE3-BTE2 -BTET2- BTMR2-BTM2- CONTROL SYSTEM
Maximum marks : 75
Instruction:
1. Question paper is divided into Group A, Group B and Group C
2. Each Group is 25 Marks
3. Figure to the right in bracket indicates marks.
4. Good Handwriting is expected
5. Assume suitable data if necessary.
Group A (25 Marks)
Answer any three questions (Question 1 is compulsory)
Q.1 Describe elements of automatic feedback of control system ?
(5)
Q.2 a) What is signal flow graph ? Explain various elements of a typical signal flow
Graph .
b) State and explain Mason’s Gain formula ?
(10)
Q.3 Write notes on tachogenerators, synchro ?
(10)
Q.4 What are the aspects taken into account while designing a control system?
(10)
Q.5 By using routh stability criterion for the following
s^6+4s^5+6s^4+8s^3+2s^2+5s+10.
(10)
Group B (25 Marks)
Answer any three questions (Questions 6 is compulsory)
Q.6 Explain with simple logic diagram of simple closed loop control system ?
Q.7 Servomechanism is represented by the equation d^2y/dy+4.8dy/dt=144E
where E is c-0.5y is the actuating signal. Find the value of damping ratio,
damped and undamped frequency of oscillation.
Q.8 Show with the help of examples that introduction of derivation mode of control in
a feedback system with proportional control makes the system response less
oscillatory. What is the effect on steady state accuracy ?
Q.9 Give an account of meaning of terms gain margin and phase margin with reference
to Nyquist plot ?
Q.10
Find the time response , initial value and final value of following function.
(a) F(s) =s(s+9)/( (s+2)(s+4)(s+6)=(-2/(s+2))+(6/(s+4)+(-2/(s+6)).
(b) F(s)= 13(s+2)/(s(s+3)^2(s+3)).
(5)
(10)
(10)
(10)
(10)
1
Group C (25 Marks)
All Questions are Compulsory.
Q.11 Fill in the blanks ( each question carry 2 marks)
1.Slope of asymptote in bode plot for second order system -------------- per octane.
2.The bode diagram method applied to----------------3. characteristic equation of an armature controlled dc motor is of ------------------- equation.
4. The difference of the reference input and the actual output signal is a called---------------5.potentiometer is used for--------------------Q.11
Multiple choice question. (Each question carry 2 marks)
1.In force current analogy mass is a analogous to
(a) inductance (b) current (c) voltage (d) capacitance.
2.The difference of the reference input and actual output signal is called
(a) error (b) controlling (c) actuating (d) none of the above.
3 Introduction of negative feedback in a system does not lead to decrease in
(a) instability (b) distortion (c) over gain (d) band width.
4. For 2% tolerance band a sitting time for a type one second order system is
(a) (b) 4/(c) 3/(d) 5
5.The transfer function when the bode diagram is plotted be the form of
(a) 1/(s+1) (b) (s+1)/t (c) st+1 (d) 1/(st+1)
Q.11
True or false (each question carry 1 marks).
1.In the transfer function approach initial condition are satisfied.
2. Pole at right side of s plane means given system is unstable.
3. For type 1 system step error constant for step input is zero.
4 Transient property of the system depends on zero of the close loop transfer function.
5.For design purpose the affect of adding controllers and their parameters can be easily visualized
on nyquiest than bode plot.
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