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
Que. 40 Well designed firstorder controll systems have
A A -ve time constant
B A small band width
C A small -ve even value
D A large -ve transfer function pole
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