Question 1
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In force-voltage analogy, velocity is analogous to:
A.
Current
B.
charge
C.
voltage
D.
Energy
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The correct answer is: Current
Question 2
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Determine the Transfer Function of the block shown below?
A.
(G1G2+G1G3)/(1+G1G2H+G1G3H)
B.
(G1G2+G1G3)/(1-G1G2H-G1G3H)
C.
(G1G2G3)/(1+G1G2H+G1G3H)
D.
(G1G2+G1G3)/(1+G1G2H)
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The correct answer is: (G1G2+G1G3)/(1+G1G2H+G1G3H)
Question 3
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How many nodes and branches are present in the corresponding signal flow graph of the
block diagram shown below?
Select one:
A.
3, 4
B.
-3, 4
C.
-4,-4
D.
4, 4
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The correct answer is: 4, 4
Question 4
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How many forward paths are present in the signal flow drawn
below?
Select one:
A.
4
B.
3
C.
5
D.
0
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The correct answer is: 3
Question 5
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Laplace transform of
A.
B.
C.
f(t) = 5 + e-2t + te-3t
Feedback
The correct answer is:
Question 6
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Select the correct steps for converting a block diagram into its equivalent signal flow graph.
a.
Select nodes of the signal flow graph as per your choice.
b.
Represent the blocks of the block diagram as loops in the signal flow graph.
c.
Represent the transfer functions inside the blocks of the block diagram as gains of the
branches in the signal flow graph.
d.
If there is a connection between two nodes (but there is no block in between) then
represent the gain of the branch as one.
Feedback
The correct answers are: Represent the transfer functions inside the blocks of the block
diagram as gains of the branches in the signal flow graph.
, If there is a connection between two nodes (but there is no block in between) then
represent the gain of the branch as one.
Question 7
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Select the equivalent block diagrams.
a.
b.
c.
d.
Feedback
The correct answers
are:
,
Question 8
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From the below-drawn block diagram of a given system, find E/R.
Select one:
A.
1/(1 + GH)
B.
1/(1 - GH)
C.
1/(1 ± GH)
D.
1/(GH).
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The correct answer is: 1/(1 ± GH)
Question 9
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Select the transfer function.
a.
b.
c.
d.
Feedback
The correct answer is:
Question 10
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In the following block diagram, G1=10/s, G2=10/s+1, H1=s+3, H2=1. The overall transfer
function is given by :
a.
10/(11s2+31s+10)
b.
100/(11s2+31s+100)
c.
100/(11s2+31s+10)
d.
100/(11s2+31s)
Feedback
The correct answer is: 100/(11s2+31s+100)
Question 11
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When a human being tries to approach an object his human brain acts as
A.
An error measuring device
B.
A controller
C.
An actuator
D.
An Amplifier
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The correct answer is: A controller
Question 12
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Select the correct transfer function.
a.
TF = KcG1G3/(1+G1G2+KcG1G3H)
b.
TF = KcG3/(1+G1G2G1G3H)
c.
TF = Kc+G1+G3/(1+G1G2+KcG1G3H)
d.
TF = KcG1+G3/(1+G1G2+KcG1G3H)
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The correct answer is: TF = KcG1G3/(1+G1G2+KcG1G3H)
Question 13
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Identify all the loops and corresponding gains in the following signal flow graph.
a.
Loop: x1-x2-x1
Gain: -G1H3
b.
Loop: x3-x4-x5-x6-x3
Gain: -G2G3H2
c.
Loop: x4-x5-x4
Gain: G2H1
d.
Loop: x3-x4-x5-x4
Gain: -G2H1
Feedback
The correct answers are: Loop: x1-x2-x1
Gain: -G1H3
, Loop: x3-x4-x5-x6-x3
Gain: -G2G3H2
, Loop: x4-x5-x4
Gain: G2H1
Question 14
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Match the following elements of mechanical system to F-V analogy?
Force (F)
Answer 1Choose...Voltage (V)Resistance (R)Inductance (L)
Friction coefficient (f) Answer 2Choose...Voltage (V)Resistance (R)Inductance (L)
Mass (M)
Answer 3Choose...Voltage (V)Resistance (R)Inductance (L)
Feedback
The correct answer is: Force (F)
→ Voltage (V), Friction coefficient (f)
→ Resistance (R), Mass (M)
→ Inductance (L)
Question 15
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Select the correct transfer function.
a.
b.
c.
TF =
d.
Feedback
The correct answer
is:
Question 16
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What are the lower and upper integral limits of a bilateral Laplace transform/
Select one:
A.
0 to ∞
B.
-∞ to 0
C.
-∞ to ∞
D.
None of these
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The correct answer is: -∞ to ∞
Question 17
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Under which rule does this block diagram algebra fit?
Select one:
A.
Moving a take off point ahead of a block
B.
Moving a take off point after of a block
C.
Moving a summing point after of a block
D.
Moving a summing point ahead of a block
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The correct answer is: Moving a take off point ahead of a block
Question 18
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Select the basic elements of a signal flow graph.
a.
Branches
b.
Nodes
c.
Gains
d.
Blocks
e.
Summing junctions
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The correct answers are: Branches, Nodes, Gains
Question 19
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Obtain the mathematical model of the of mechanical translational system shown
below.
A.
F = Md2 x/dt2 + Bdx/dt+ kx
B.
F = Md2 v/dt2 + Bdv/dt+ kv
C.
F = Bd2 x/dt2 + M dx/dt+ kx
D.
M = Fd2 x/dt2 + Bdx/dt+ kx
Feedback
The correct answer is: F = Md2 x/dt2 + Bdx/dt+ kx
Question 20
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What do we ultimately estimate out of a control system using Mason’s gain formula?
Select one:
A.
Feedback gain of the system
B.
Partial gain of the system
C.
Overall gain of the system
D.
Loss
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The correct answer is: Overall gain of the system
Question 21
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What is the force voltage analogy of spring constant (K) in electrical systems?
Select one:
A.
Capacitance (C)
B.
Inductance (L)
C.
Resistance (R)
D.
Inverse capacitance (1/C)
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The correct answer is: Inverse capacitance (1/C)
Question 22
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Which of the following are most likely to be present in a block diagram of a system?
a.
Take off point
b.
Nodes
c.
Branches
d.
Summing point
Feedback
The correct answers are: Take off point
, Summing point
Question 23
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Select the correct transfer function.
a.
b.
c.
d.
Feedback
The correct answer
is:
Question 24
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Determine the loop transfer function from the below-drawn block diagram of a closed-loop
control system.
Select one:
A.
-K1K2/(s+p)
B.
K2/(s+p)
C.
K1/(s+p)
D.
K1K2/(s+p)
Feedback
The correct answer is: K1K2/(s+p)
Question 25
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If the transfer function F(S) of a complex function and its derivative simultaneously exist in a
domain, then we call the complex function to be
Select one:
A.
Non analytic
B.
Analytic
C.
Partially analytic
D.
Unique
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The correct answer is: Analytic
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The unit step response of a system is given by c(t)=1 + 0.25 e-50t - 1.25 e-10t
The given system is _.
A.
underdamped
B.
overdamped
C.
critically damped
D.
undamped
Feedback
The correct answer is: overdamped
Question 2
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For K=10, determine the sensitivity SKT
A.
s(s+1)/(s(s+1)+100)
B.
s/(s+1)
C.
(s+1)/(s+100)
D.
10/(s(s+1)+10)
Feedback
The correct answer is: s(s+1)/(s(s+1)+100)
Question 3
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If the characteristic equation of a closed-loop system is given as s2+4s+16 = 0, then the
natural frequency of the oscillations is _ rad/s and the damping ratio is _.
A.
4
B.
0.5
C.
2
D.
0.2
Feedback
The correct answers are: 4, 0.5
Question 4
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A unit impulse signal will have _ value everywhere except at t=0.
A.
0
B.
constant
C.
increasing
D.
1
Feedback
The correct answer is: 0
Question 5
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The error signal is the algebraic sum of the _ and _.
A.
reference input
B.
feedback
C.
output
D.
gain
Feedback
The correct answers are: reference input
, feedback
Question 6
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If ωn = 5 rad/s and ζ=0.6, then the rise time is _ s.
A.
0.55
B.
2.28
C.
4
D.
3.14
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The correct answer is: 0.55
Question 7
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Select the damping factor(s), δ, that is allowed for a robotic control system.
A.
1
B.
0.1
C.
0
D.
0.99
Feedback
The correct answers are: 1, 0.99
Question 8
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The transient response of a second-order underdamped system starting from rest is
The natural frequency of the system is _.
A.
10
B.
100
C.
8
D.
5
Feedback
The correct answer is: 10
Question 9
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Which of the following effect in the system is/are caused by negative feedback?
A.
Reduction in gain
B.
Increased in bandwidth
C.
Increase in distortion
D.
Reduction in output impedance
Feedback
The correct answers are: Reduction in gain
, Increased in bandwidth
, Reduction in output impedance
Question 10
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What should be the value of the damping factor (ζ) in order to achieve a high response
speed consistent with other performance measures?
A.
ζ=1
B.
ζ = -1
C.
ζ<1
D.
ζ>1
Feedback
The correct answer is: ζ < 1
Question 11
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A second-order system is given by
Question text
Given G(s) = 500/s(s+15) and H(s) = 1, the steady state error when subjected to unit ramp
input is Answer ( do not write units)
Feedback
The correct answer is: 0.03
Question 2
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Given that G(s) = 250/(S2+140s+50). Determine the value of KP and KV. Select two correct
options.
A.
KP=0
B.
KP=5
C.
KV=5
D.
KV=0
Feedback
The correct answers are: KP=5, KV=0
Question 3
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The open loop transfer function of unity feedback system is given by
Determine the KV. ( do not write units)
Answer:
Feedback
The correct answer is: 1
Question 4
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Determine Type number and order of the unity feedback system given by
A.
Type = 3, Order = 3
B.
Type = 1, Order = 2
C.
Type = 1, Order = 3
D.
Type = 0, Order = 3
Feedback
The correct answer is: Type = 1, Order = 3
Question 5
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The charecteristic equation is given by S4+2S3+3S2+6S+10=0. The system is ______ and
number of poles lying on RHS of S-plane are ________. (Select correct options).
A.
system is stable
B.
system is unstable
C.
Number of poles lying on RHS are 2
D.
Number of poles lying on RHS are 0
Feedback
The correct answers are: system is unstable
, Number of poles lying on RHS are 2
Question 6
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The charecteristic equation is given by S4+2S3+3S2+2S+K=0. Determine the range of K for
which system is stable.
A.
1<K<2
B.
0<K<2
C.
10>K>2
D.
K=10
Feedback
The correct answer is: 0<K<2
Question 7
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The position and velocity error constants of Type-2 system are ____ and _____
A.
constant, constant
B.
Infinity, Infinity
C.
zero, constant
D.
zero, zero
Feedback
The correct answer is: Infinity, Infinity
Question 8
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match the following
Relative Stability Answer 1Choose...Steady state errorPeak timefeedback path
Accuracy
Answer 2Choose...Steady state errorPeak timefeedback path
Sensitivity
Answer 3Choose...Steady state errorPeak timefeedback path
Feedback
The correct answer is: Relative Stability
→ Peak time, Accuracy → Steady state error, Sensitivity → feedback path
Question 9
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Select all correct statements
A.
For a Type-1 system the steady state error for acceleration is infinite
B.
For a Type-1 system the steady state error for acceleration is zero
C.
For a Type-2 system the steady state error for ramp input is zero
D.
For a Type-2 system the steady state error for ramp input is constant
Feedback
The correct answers are: For a Type-1 system the steady state error for acceleration is infinite
, For a Type-2 system the steady state error for ramp input is zero
Question 10
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The closed loop transfer function of system is given by 1/(s+1) . what is the steady state
error when subjected to unit impulse input.
A.
zero
B.
one
C.
infinite
D.
0.5
Feedback
The correct answer is: zero
Question text
In a unity feedback system the G(s) = 500/s(s+15) and R(s) = 1/s . The steady state error is
A.
0
B.
0.03
C.
0.01
D.
infinate
Feedback
The correct answer is: 0
Question 2
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For ramp step input, the steady state error of the transfer function T(s) = 5/s2+7s+10 is
A.
0.5
B.
1
C.
0
D.
∞
Feedback
The correct answer is: ∞
Question 3
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For the following system, find the steady-state error for r(t) = 5u(t).
A.
0.24
B.
1
C.
0
D.
∞
Feedback
The correct answer is: 0.24
Question 4
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Choose the values of 'K' for which the closed-loop system has zero poles in the right half of
the s-plane.
G(s)=K(s+1)(s+2)/(s+0.1)(s-1)
A.
0.1
B.
0.5
C.
2
D.
-1
Feedback
The correct answers are: 0.5, 2
Question 5
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In a unity feedback system G(s) = 60 (1+0.2S) /(1+0.3s)(5+5) . Determine the value of KP
Answer:
Feedback
The correct answer is: 12
Question 6
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For the system given by given by G(S) H(S) = 250/ (s2 + 15s + 50) match the following .
Subjected to unit step input.
kP
Answer 1Choose...0.167250
KV
Answer 2Choose...0.167250
order Answer 3Choose...0.167250
ESS
Answer 4Choose...0.167250
Feedback
The correct answer is: kP → 5, KV → 0, order → 2, ESS → 0.167
Question 7
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A system has characteristic equation as Δ(s) = s3+30s2+(K+200)s+40K. For K=......., the system
has marginal stability with oscillation frequency ......... rad/sec.
A.
600
B.
800
C.
24.5
D.
28.3
Feedback
The correct answers are: 600, 28.3
Question 8
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A third-order system with the characteristic equation Δ(s)=s3+8.5s2+20s+12.5(1+K). Answer
the following based on this
1)The limiting value of 'K' is ........
2) What value of 'K' makes the system stable with a settling time of 4 seconds?
a.
2.64
b.
12.6
c.
14
d.
6.5
Feedback
The correct answers are: 2.64, 12.6
Question 9
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In a unity feedback system G(s) = 60 (1+0.2S) /(1+0.3s)(5+5) . Determine the value
of steady state error when input r(t) = 10.
Answer:
Feedback
The correct answer is: 0.769
Question 10
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Determine the range of K for which system is stable given by charecteristic equation s3 +
10s2 + (21+K)s +13K = 0.
A.
0 < K < 70
B.
210>K > 70
C.
0 < K < 210
D.
0 < K < 21
Feedback
The correct answer is: 0 < K < 70
Question text
Stability in a system implies that small changes in the .................................................... do not result
in large changes in the system output.
A.
system input
B.
initial conditions
C.
system parameters
D.
feedback
Feedback
The correct answers are: system input
, initial conditions
, system parameters
Question 2
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The characteristic equation of a system is given as
1+(K(s+2)(s+3)/s(s+1))=0
Select the correct answers.
Breakaway point Answer 1Choose...0.0718-2.366-0.634
Breakin point
Answer 2Choose...0.0718-2.366-0.634
Feedback
The correct answer is: Breakaway point
→ -0.634, Breakin point
→ -2.366
Question 3
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The frequency response for a network function H(s) is given in Figure. H(s) is given by:
A.
10S/(S+1)
B.
S/(S+1)
C.
1/S(S+1)
D.
10/(S+1)
Feedback
The correct answer is: 10/(S+1)
Question 4
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The loop transfer function is given by G(S)H(S)=k(S+3)/S(S+1). THE CENTROID IS Answer
Feedback
The correct answer is: -2
Question 5
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The pole factor 1/(1+jwT) has a slope of
A.
20 db/decade
B.
-20 db/decade
C.
-40 db/decade
D.
+40 db/decade
Feedback
The correct answer is: -20 db/decade
Question 6
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A unity feedback control system with an open-loop transfer function of
G(s)=K(s+1)(s+2)/(s+0.1)(s-1).
The root locus crosses the jω axis at K=..................
a.
0.3
b.
1
c.
0.5
d.
0
Feedback
The correct answer is: 0.3
Question 7
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A Bode plot is drawn for a system given by G(s) = S2/(1+S)(1+0.25S)
Slop of bode plot from ω=0 to ω=1 rad/sec Answer 1Choose...0 db/dec+40 db/dec+20
db/dec
Slop of bode plot from ω=1 to ω=4 rad/sec Answer 2Choose...0 db/dec+40 db/dec+20
db/dec
Slop of bode plot from ω=4 to ω=100
Answer 3Choose...0 db/dec+40 db/dec+20
rad/sec
db/dec
Feedback
The correct answer is: Slop of bode plot from ω=0 to ω=1 rad/sec
→ +40 db/dec, Slop of bode plot from ω=1 to ω=4 rad/sec
→ +20 db/dec, Slop of bode plot from ω=4 to ω=100 rad/sec
→ 0 db/dec
Question 8
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The transfer function of the system is given by T(S) =169/S2+7S+169. The Resonant peak
is Answer ( do not write units)
Feedback
The correct answer is: 1.93
Question 9
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A system transfer function is Y(s)/X(s)=s/(s+p). If y(t)=cos (2t-Π/3) for input
signal x(t)=p cos (2t-Π/2), then p=............
A.
2/√3
B.
√3
C.
1/√3
D.
√3/2
Feedback
The correct answer is: 2/√3
Question 10
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Phaseι cross over frequency is the one at which ⁄__G(jω)H(jω is
A.
equal to 180 Deg
B.
equal to 0 Deg
C.
equal to -180 Deg
D.
equal to 90 Deg
Feedback
The correct answer is: equal to -180 Deg
Question 11
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The characteristics equation of closed loop control system is 1+K/{S(S+1)(S+4)} =0. The
centroid of asymptotes in the root locus is given by
A.
-1
B.
-2
C.
-3
D.
all the 3 options are wrong
Feedback
The correct answer is: all the 3 options are wrong
Question 12
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If a breakaway point is obtained when 'r' branches of the root locus come together and meet
at a point then that point represents the ..........th root of the characteristic equation.
A.
r
B.
r+1
C.
r-1
D.
r+2
Feedback
The correct answer is: r
Question 13
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Select the correct transfer function in the frequency
domain.
A.
3(1+j2ω)/(jω)(1+j0.2ω)
B.
3(1+jω)/(jω)(1+j0.2ω)
C.
3(1+j2ω)/(jω)(1+jω)
D.
3(1+j2ω)/(j2ω)(1+j0.2ω)
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The correct answer is: 3(1+j2ω)/(jω)(1+j0.2ω)
Question 14
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The ending point of root locus are
A.
open loop pole
B.
open loop zero
C.
closed loop pole
D.
closed loop zero
Feedback
The correct answer is: open loop zero
Question 15
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A system has 12 poles and 2 zeros. Its high frequency asymptote in its magnitude plot has a
slope of
A.
-200 dB/decade
B.
-240 dB/decade
C.
-320 dB/decade
D.
-280 dB/decade
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The correct answer is: -240 dB/decade
Question 16
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The unity negative feedback system has the open-loop transfer function
G(s) = K/s(s+1)(s+3).
At K=...................., the root locus crosses the imaginary axis.
A.
12
B.
2
C.
1
D.
10
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The correct answer is: 12
Question 17
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The break away point of the root locus occur at
A.
Imaginary axis
B.
real axis
C.
complex pole
D.
RHS of S plane only
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The correct answer is: real axis
Question 18
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match the following for the root locus of system given by G(s) H(s) = K(S+3)/(S+2+j5)(S+2j5)
Number of root loci
Answer 1Choose...01-12
Centroid
Answer 2Choose...01-12
Type of system
Answer 3Choose...01-12
Number of root loci terminating at infinity Answer 4Choose...01-12
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The correct answer is: Number of root loci
→ 2, Centroid → -1, Type of system
→ 0, Number of root loci terminating at infinity
→1
Question 19
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The gain (20 log|G(s)| is -32 dB at 1 rad/sec and -8 dB at 10 rad/sec. If phase is negative for
all 'ω', find the G(s).
A.
39.8/s2
B.
39.8/s
C.
32/s
D.
32/s2
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The correct answer is: 39.8/s2
Question text
For the transfer function, G(s)=5(s+4)/s(s+0.25)(s2+4s+25).
The values of the constant gain term and the highest corner frequency of the Bode plot
respectively are ....................................
a.
3.2
b.
5
c.
16
d.
4
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The correct answers are: 3.2, 5
Question 2
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Consider the following asymptotic Bode magnitude plot (ω is in rad/s).
Which one of the following transfer functions is best represented by the above Bode
magnitude plot?
A.
2s/(1+0.5s)(1+0.25s)2
B.
4s/(1+s)2(1+0.5s)
C.
2s/(1+2s)(1+4s)
D.
4s/(1+4s)(1+2s)2
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The correct answer is: 2s/(1+0.5s)(1+0.25s)2
Question 3
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The open loop transfer function given by G(s) =10 (1+0.05S)/S(1+0.5S)(1+0.1S).
first corner frequency
Answer 1Choose...2120-40
initial slope of magnitude plot ___ db/decade Answer 2Choose...2120-40
Final slope of magnitude plot ___ db/decade Answer 3Choose...2120-40
Type number of system
Answer 4Choose...2120-40
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The correct answer is: first corner frequency
→ 2, initial slope of magnitude plot ___ db/decade
→ 20, Final slope of magnitude plot ___ db/decade
→ -40, Type number of system
→1
Question 4
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The Phase angle of bode plot at ω=0 rad/sec for the system given by
G(S)H(S)=(1+0.05S)/S(1+0.2S)(1+0.1S) is -Answer Degrees. ( do not use negative symbol in
answer)
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The correct answer is: 90
Question 5
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For G(s)H(S) = K/s(s+1)(s+3), the point of intersection of the asymptotes of the root loci
with the real axis is ..................
A.
-1.33
B.
1.33
C.
4
D.
0
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The correct answer is: -1.33
Question 6
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The gain at the breakaway point of the root locus of a unity feedback system with open-loop
transfer function G(s)=Ks/(s−1)(s−4) is
a.
1
b.
2
c.
5
d.
9
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The correct answer is: 1
Question 7
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The open-loop poles of a third-order unity feedback system are at 0,-1,-2. Let the frequency
corresponding to the point where the root locus of the system transits to an unstable region
be K. Now suppose we introduce a zero in the open-loop transfer function at -3, while
keeping all the earlier open-loop poles intact. Which one of the following is TRUE about the
point where the root locus of the modified system transits to an unstable region?
a.
It corresponds to a frequency greater than K
b.
It corresponds to a frequency less than K
c.
•
It corresponds to a frequency K
d.
Root locus of modified system never transits to unstable region
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The correct answer is: Root locus of modified system never transits to unstable region
Question 8
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A system has poles at 0.01 Hz, 1 Hz, and 80Hz, zeroes at 5Hz, 100Hz, and 200Hz. The
approximate phase (in degrees) of the system response at 20 Hz is :
a.
-90
b.
90
c.
0
d.
180
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The correct answer is: -90
Question 9
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The factor s in bode plot has a slope of
A.
+40db/decade
B.
- 40db/decade
C.
20 db/octave
D.
6 db/Octave
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The correct answer is: 6 db/Octave
Question 10
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The transfer function is given by T(s)=121/S2+11S+121, The Bandwidth is Answer rad/sec
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The correct answer is: 14
Question 11
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The stability of feedback system using bode plot is determined from ( select all correct
option)
A.
Sign of phase margin
B.
Sign of gain margin
C.
magnitude of Gain margin
D.
Magnitude of phase cross over frequency
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The correct answers are: Sign of phase margin
, Sign of gain margin
Question 12
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For a unity feedback system with G(s)=K/s(s+1)(s+3), the root locus crosses the imaginary
axis at K=................
a.
12
b.
10
c.
_10
d.
-2
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The correct answer is: 12
Question 13
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The loop transfer function is given is G(S)=K/S(S2+4S+8). The centroid is _____
A.
1.334
B.
-1.334
C.
2
D.
1
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The correct answer is: -1.334
Question 14
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The critical value of gain for a system is 40 and gain margin is 6dB. The system is operating
at a gain of ..................
a.
20
b.
30
c.
40
d.
100
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The correct answer is: 20
Question 15
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The root locus of the unity feedback system is shown in figure
Select the closed-loop transfer function of the system.
a.
K/[(s+1)(s+2)-K]
b.
K/[(s+1)(s+2)+K]
c.
1/[(s+1)(s+2)-K]
d.
K/[(s+1)(s+2)-1]
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The correct answer is: K/[(s+1)(s+2)-K]
Question 16
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If the open-loop transfer function contains one zero in the right half of the s-plane then
choose the correct option.
a.
Open loop system is unstable
b.
Close loop system is unstable
c.
Closed loop system is unstable for higher gain
d.
Closed loop system is stable
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The correct answer is: Closed loop system is unstable for higher gain
Question 17
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The frequency transfer function of second order system is given by T(S)=121/S2+11S+121.
The resonant frequency is ___ rad/sec
A.
11
B.
0.5
C.
7.778
D.
10
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The correct answer is: 7.778
Question 1
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If the system is represented by G(s) H(s) = k (s+7) / s (s +3) (s + 2), what would be its
magnitude at ω = ∞?
A.
0
B.
∞
C.
1
D.
0.2
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The correct answer is: 0
Question 2
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Consider the system represented by 200/[s3 (s + 3) (s + 6) (s + 10)]. What would be the
total phase value at ω = 0?
A.
-270°
B.
0°
C.
90º
D.
-180º
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The correct answer is: -270°
Question 3
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For a system G(s)=(1-s)/(4+2s), choose the encirclements around the point -1+j0 in the
complex plane by the Nyquist plot.
A.
0
B.
1, clockwise
C.
1, anti-clockwise
D.
2, clockwise
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The correct answer is: 0
Question 4
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The polar plot of G(s)=10(s+1)/(s+10) for 0<ω<∞ will be in ..................................
A.
first
B.
second
C.
third
D.
fourth
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The correct answer is: first
Question 5
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For Nyquist contour, the size of radius is _______
A.
∞
B.
0
C.
1
D.
25
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The correct answer is: ∞
Question 6
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The Nyquist stability criterion and Routh-Hurwitz stability criterion are used for determining
the stability of feedback controllers. Select the incorrect statement(s).
A.
The closed-loop frequency response for a unity feedback system cannot be obtained from
the Nyquist plot.
B.
Bode magnitude plot alone is insufficient to give general approximation of Nyquist plot.
C.
The closed-loop poles need not be calculated for Nyquist plots.
D.
It is necessary to calculate closed-loop poles for the root locus technique.
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The correct answers are: The closed-loop frequency response for a unity feedback system
cannot be obtained from the Nyquist plot.
, Bode magnitude plot alone is insufficient to give general approximation of Nyquist plot.
Question 7
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In polar plots, what does each and every point represent w.r.t magnitude and angle?
A.
phasor
B.
vector
C.
scalar
D.
differentiator
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The correct answer is: phasor
Question 8
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For the transfer function, G(jω)=5+jω, choose the corresponding Nyquist plot for positive
frequency.
A.
B.
C.
D.
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The correct answer is: