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WorksheetsControl System
Total questions: 30
Worksheet time: 4mins
In Root locus criterion, the Evan's magnitude condition is:
| G(s)H(s) | = 1
| G(s)H(s) | = -1
| G(s)H(s) | = 0
| G(s)H(s) | = 10
In Root locus criterion, the Evan's angle condition is:
Angle of { G(s)H(s) } = 0 degrees
Angle of { G(s)H(s) } = 360 degrees
Angle of { G(s)H(s) } = 90 degrees
Angle of { G(s)H(s) } = 180 degrees
The Nyquist Contour covers the_________
entire bottom half of s plane
entire right half of s plane
entire upper half of s plane
entire left half of s plane
If an s-plane contour encloses TWO poles in clockwise direction, then the mapping of this contour in G(s)H(s) plane will:
encircle the origin once in Clockwise direction.
encircle the origin twice in Clockwise direction.
encircle the origin once in Anti-Clockwise direction.
encircle the origin twice in Anti-Clockwise direction.
If an s-plane contour encloses TWO zeros in clockwise direction, then the mapping of this contour in G(s)H(s) plane will:
encircle the origin once in Clockwise direction.
encircle the origin twice in Clockwise direction.
encircle the origin once in Anti-Clockwise direction.
encircle the origin twice in Anti-Clockwise direction.
Gain Margin is evaluated at:
gain crossover frequency
phase cross over frequency
cut-off frequency
steady state
Phase Margin is evaluated at:
gain crossover frequency
phase cross over frequency
cut-off frequency
steady-state
In root locus, the centroid is a point where
The branches of the root locus intersect with the imaginary axis.
The branches of the root locus tend to infinity.
The asymptotes cross the real axis.
The branches of the root locus terminate on the real axis.
The Point where two root locus branches coincide with each other is called:
Corner point
centroid
break-away point
origin
A root locus plot is always _____________around the _____________ axis.
symmetric, imaginary
symmetric, real
asymmetric, real
absent, imaginary
Root locus technique is a_________________ approach to assess system stability.
graphical
algebraical
tabular
logical
For a system to be stable:
all roots must lie in the right half s plane
all roots must lie in the left half s plane
some roots may lie in the right half s plane
few roots may lie on an imaginary axis.
The transfer function of a system is G(s)=s2+2s+2525
Its natural frequency Wn is:-
Wn=25
Wn= 10
Wn= 5
Wn= 625
The sinusoidal transfer function can be obtained by putting:
s= 1+jw
s= -1+jw
s=jw
s= 1-jw
Nyquist criterion is used to
determine time response
assess closed-loop stability
assess open-loop stability
draw root locus
Sensors take analog readings, but computers only understand...
Which among the following illustrate an example of open loop system?
Water level controller
Servo voltage stabilizer
Automatic tea maker
Automatic electric iron
the overall transfer function of two blocks in parallel are
product of individual gain
sum of individual gain
division of individual gain
difference of individual gain
the overall transfer function from block diagram reduction for cascade is:
division of individual gain
sum of individual gain
product of individual gain
difference of individual gain
Phase cross over frequency is the frequency at which
M=0
Ø = -1800
G.M.=0
P.M.= 0
In bode plot a simple pole will contribute a slope of
20 db/decade
40 db/decade
-40 db/decade
-20 db/decade
In terms of bode plot, the system is stable if
PM=GM
PM and GM
both are
positive
PM and GM both
are negative
PM negative but
GM positive
For K = 0.2, magnitude plot will be _____. K is gain of the system
Above 0 db line
Below 0 db line
0 db line
None of these
A system has 8 poles and 5 zeroes, the slope of Bode Magnitude plot at very high frequencies is:
60dB/decade
-60dB/decade
160dB/decade
-160dB/decade
1.Frequency response mean
a)Transient response of a system to a sinusoidal input
b)Steady state response of a system to a sinusoidal input
c)Oscillatory response of a system to a sinusoidal input
d)None of these
If the phase cross over frequency ωpc is equal to the gain cross over frequency ωgc, then the control system is
unstable
stable
marginally stable
If the phase cross over frequency ωpc is less than the gain cross over frequency ωgc, then the control system is
stable
marginal
unstable
none
The _______ is defined as the value of gain, to be added to system in order to bring the system to the verge of instability.
phase margin
gain margin,
What is the definition of a cutoff frequency in an amplifier's frequency response?
Frequency where input voltage is minimum
Frequency at which power is maximum
Frequency where gain has dropped by 3 dB
Frequency where current is zero
What does the bandwidth of an amplifier represent?
Frequency range where gain is zero
Range between the power supply limits
Range between the lower and upper cutoff frequencies
The total harmonic distortion range
