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B.P Mandal College of Engineering, Madhepura
B.Tech (EEE) 5th Sem. Mid Semester Examination 2020
Subject: Control System
Time allotted: 1hrs Full Marks = 5*1+5*5 = 20
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Q 1. The most commonly used input signal(s) in control system is /are
1 point
(a) Step function
(b) Ramp or velocity function
(c) Accelerating functions
(d) All of the above
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Q 2.An open loop T.F. of a unity feedback system is given by G(s) = 1/(s+2)2.The closed loop T.F. will have poles at
1 point
(a) -2 , -2
(b) -2 , -1
(c) -2 +j , -2-j
(d) -2, 2
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Q 3. A unity feedback control system has G(s) = k/s2(1+Ts) the order and the type of the closed-loop system will be ?
1 point
(a) Two and Two
(b) Three and Two
(c) Two and Zero
(d) Three and Zero
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Q 4.Given the transfer function G(s) = 121/s2+16s+121 of a system. which of the following characteristics does it have ?
1 point
(a) Overdamped and settling time 1.1 sec
(b) Underdamped and settling time 0.5 sec
(c) Critically damped and settling time 0.8 sec
(d) Underdamped and settling time 0.707 sec
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Q .5 Type of a system depends on the
1 point
(a) number of its poles
(b) number of its real poles only
(c) number of poles it has at the origin
difference between the number of poles and zeros
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Q 6. Determine the overall transfer function relating C and R for the system whose block diagram is shown in Fig. 4.48
5 points
(a)( G1G2+G1G3)/(1+G2H2+G1G2H1- G1G2G3H1H2)
(b)( G1G2+G1G3)/(1+G1H2+G1G2H1- G1G2G3H1H2)
(c)( G1G2+G1G3)/(1+G2H2+G1G2H2 - G1G2G3H1H2)
(d)( G1G2+G2G3)/(1+G2H2+G1G2H1- G1G2G3H1H2)
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Q 7. Find transfer functions for signal flow graphs given below
5 points
(a) G1G2/(1+G1G2H2+H1)
(b) G1G2/(1+G1G2H1+H1)
(c) G1/(1+G1G2H2+H1)
(d) G2/(1+G1G2H2+H1)
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Q 8. For a second order system with Wn = 10 rad/sec , Geeta = 0.8 and tolerance = 5 %. Calculate the following parameters for unit step input: (i) Rise time (ii) peak time (iii) peak overshoot (iv) settling time
5 points
(a) 0.4163 sec , 0.5236 sec , 1.5164 % & 0.375 sec
(b) 0.5236 sec , 1.5164 % & 0.375 sec , 0.4163 sec
(c) 0.4163 sec , 1.5164 % ,0.375 sec , 0.4163 sec
(d) 0.4163 sec , 0.375 sec , 0.4163 sec , 1.5164 %
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