Instructions:
(a)4 marks will be allotted for correct question and 1 will be
deducted for incorrect question. (b)More than
one answer can be correct.
Que.
1
An open loop transfer function, is given by G(s) H(s)=K(s+1)/s(s+2)(s^2+2s+2)
it has
A
one zero at infinity
B
two zero at infinity
C
three zero at infinity
D
four zero at infinity
Que.
2
The principles of homogenity and superposition are applied to
A
linear time varieant system
B
non-linear time varieant system
C
linear time invarieant system
D
non-linear time invarieant system
Que.
3
In the deriative error compensation
A
damping decreases and settling time decreases
B
damping increases and settling time increases
C
damping decreases and settling time increases
D
damping increases and settling time decreases
Que.
4
The lapalace transformation of f(t) is F(s). given F(s)=w/s^2+w^2, the
final value of f(t) is
A
infinity
B
0
C
1
D
none of the above
Que.
5
Natural freq. of a unity feed back control system of transfer function
G(s)=10/s(s+1) is
A
3.16 rad/s
B
0.5 rad/s
C
4.6 rad/s
D
none ofthese
Que.
6
The position and acceleration error cofficients for the open loop transfer
function G(s)=K/s^2(s+10)(s+100) respictively are
A
0 and infinity
B
infinity and 0
C
k/100 and 0
D
infinity and k/1000
Que.
7
The position and velocity error cofficients for thesystem of transfer
function G(s)=50/(1+.1s)(1+2s)
A
0,0
B
0,infinity
C
50,0
D
50,infinity
Que.
8
A system has the transfer function (1-s)/(1+s) it is known as
A
low pass system
B
high pass system
C
all pass system
D
none of these
Que.
9
The transfer of a system is 10/1+s. when operatedas unity fedback system,the
steady state error to a unit step input will be
A
0
B
1/11
C
10
D
infinity
Que.
10
A phase lead compensator has the transfer function G(s)=10(1+0.4s)/(1+0.1s)
the maximum phase angle lead provided by this compensator will occure
at a freq. wm is equal to
A
50 rad/sec
B
25 rad/sec
C
10 rad/sec
D
4 rad/sec
Que.
11
Sinusoidal oscillators are
A
stable
B
unstable
C
margin stable
D
conditionally stable
Que.
12
If thegain of the open loop system is doubled, the gain margin
A
is not affected
B
gets doubled
C
becomes half
D
become one fourth
Que.
13
Phase margin of a system is used to specified
A
relative stability
B
absolute stability
C
time response
D
freq. response
Que.
14
The feedback system with charecteristic equation s^4+20Ks^3+5s^2+10s+15=0
A
stable for all value of k
B
stable for +ive value of k
C
stable for infinity > k > 7
D
unstable for all value of k
Que.
15
In the above system if a=.1, the steady state error to unity ramp input
will be
A
.16
B
.25
C
.35
D
.49
Que.
16
If the charecteristic equation of a close loop system is 1+k/s(s+1)(s+2)=0,the
centroid at the asymptotes in root locus will be
A
0
B
2
C
-1
D
-2
Que.
17
The magnitude freq. response of a control system.the value of w1 and w2
are respectively
A
10,200
B
20,200
C
20,400
D
100,400
Que.
18
A control system whose step response is -0.5(1+e^-2t) is cascaded in another
control block whose impulse response is e^-t the transfer function of
the cascaded combination is
A
1/(s+1)(s+2)
B
1/s(s+1)
C
1/s(s+2)
D
0.5/(s+1)(s+2)
Que.
19
The error response of a secound order system to a step input is obtained
as E(t)=1.66e^-st sin(6t+37degree) the damping ratio is
A
0.4
B
0.5
C
0.8
D
1.0
Que.
20
In a linear system an input of 5sin wt produces an output of 10coswt
the output corresponding to input 10cos wt will be equal to
A
+5sinwt
B
-5sinwt
C
+20 sinwt
D
-20 sinwt
Que.
21
Signal flow graph is used to find
A
stability of the system
B
controllability of the system
C
transfer function of the system
D
poles of the system
Que.
22
The transfer function of a linear system is the
A
ratio of the output Vo(t) and input V1(t)
B
ratio ofthe derivatives of the output and the input
C
ratio ofthe laplace transform of the output and that of the
input with all initial conditions zero
D
none of these
Que.
23
The transfer function of a tachometer is of the form
A
Ks
B
K/s
C
K/s+1
D
K/[s(s+1)]
Que.
24
consider a unity feedback control system with open-loop transfer function
G(s)=K/[s(s+1)] thesteady state error of the system due to a unit step
input is
A
0
B
K
C
1/K
D
infinity
Que.
25
The transfer function of a zero order hold system is
A
(1/s)(1+e^-st)
B
(1/s)(1-e^-st)
C
1-(1/s)e^-st
D
1+(1/s)e^-st
Que.
26
Consider the feedback control system with loop transfer function G(s)H(s)=K(1+.5s)/s(1+s)(1+2s)
A
0
B
1
C
2
D
3
Que.
27
non minimum phase transfer function is defined as the transfer function
A
which has zeros in right half S plane
B
which has zeros only in left half S plane
C
which has poles in right half S plane
D
which has poles in left half S plane
Que.
28
Consider a unity feedback control system with open loop transfer function
G(s)= k/[s(s+1)].the steady state error of the system due to a
unit step input is
A
0
B
K
C
1/K
D
infinite
Que.
29
The transfer function of a phase lead controller is [1+3Ts]/[1+Ts] the
maximum value of phase provided by the controller is
A
90 degree
B
60 degree
C
45 degree
D
30 degree
Que.
30
A memory system of size 26kbytes is required to be designed using memory
chips which have 12 address lines and 4 data lines each. the number of
such chips required to design the memory system is
A
2
B
4
C
8
D
16
Que.
31
In the Bode plot of a unit feedback control system, the value of the phase
of G(jw) at the gain cross over frequency is -125degree the phase margin
of the system is
A
-125 degree
B
-55 degree
C
55 degree
D
125 degree
Que.
32
the transfer function of a system is [2s^2+6s+5]/[(s+1)^2.(s+2)]
the characteristic equation of the system is
A
2s^2+6s+5=0
B
(s+1)^2(s+2)=0
C
2s^2+6s+5+(s+1)^2(s+2)=0
D
2s^2+6s+5-(s+1)^2(s+2)=0
Que.
33
for the system described by the state equaction
|0 1 0| |0|
x= |0 0 1|x + |0|u
|0.5 1 2| |1|
if thecontrol signal u is given by u=[-0.5 -3 -5]x+v, then the value eigenvalues of the
closed loop system will be
A
0,-1,-2
B
0,-1,-3
C
-1,-1,-2
D
0,-1,-1
Que.
34
A system described by the transfer function H(s)=1/[ s^3+as^2+ks+3]
is stable. the constraints on a and k are
A
a>0,ak<3
B
a>0,ak>3
C
a<0,ak>0
D
a>0,ak<0
Que.
35
If a signal f(t) has energy E,the energy of the signal f(2t)=
A
E
B
E/2
C
2E
D
4E
Que.
36
The open loop transfer function of a feed back control system is G(s)H(S)=1/(s+1)^3.
The gain margin of the system is
A
2
B
4
C
8
D
16
Que.
37
An advantage of memory interlacing is that
A
a large memory is obtaind
B
effective speed of the memory is increased
C
the cost of the memory is reduced
D
in an voltatile memory is obtained
Que.
38
When the root of a charecteristic equation are conjugate and on the imaginary
axis, the response is of the type
A
A sin(wt+beta)
B
Ae^(o-t)
C
Ae^-(o-t)
D
A ln(o-t)
Que.
39
A degreereferigerable monoshot is one which
A
can be triggered only once
B
has two Quasi-stable states
C
cannot be triggered untill full pulse has been outonly once
D
is capable of being triggered while the out put is being
