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Questions in this quiz (88)
1choose
- Aequal approximations, whereby due to trigonometric connections both
variants are equal and Variant 2 allows an easier interpretation (magnitude and phase) - Bdifferent approximations with the same accuracy.
- Cthe same approximation, whereby Variant 1 requires more coefficients
(A0,Ak,Bk) and is therefore more accurate - Ddifferent approximations with different accuracy.
- Aequal approximations, whereby due to trigonometric connections both
2choose
- AThe relations stated in G(jω) are only correct in specific points in
time based on the model structure assumed to be linear and timeinvariant. - BThe relations stated in G(jω) are only correct in specific points in
time based on the model structure assumed to be linear and timevariant. - CWith G(jω), a frequency-independent variable with magnitude and
phase is described. - DWith G(jω), a frequency-dependent variable with magnitude and
phase is described. - EThe relations stated in G(jω) describe only transient relationships in
general
- AThe relations stated in G(jω) are only correct in specific points in
3choose
- Athe pole-zero (PZ) form
- Bthe time-constant (TN) form.
- Ca universal description form for the direct (readable) representation
of poles, zeros, and time constants.
4The signal y(s) = G (s) u (s) with G (s) = TDs + 1 and u (s) = 1 describes with
- Ay(s) = TD s+ 1 the impulse response of a PD-system.
- By(s) = TDs + 1 the impulse response of a PDT1-system.
- C© y(s) = TD + 1 the step response of a PD-system.
- D© y(s) = TD + 1 the step response of a PDT1-system.
5Consider the transformation of the description of a linear time-invariant SISO-system
into a description in frequency domain. This transformation can- A© be achieved dependent on the order of derivatives.
- B© be achieved independent of the order of derivatives.
- C© not be achieved in general.
- D© only be achieved numerically (by machine).
6choose
- AA statement about G(s) can be derived from the static final value
when considering a step response via the Laplace boundary theorems. - BThe static gain corresponds to the value of the step response for
t → ∞, but can also be derived as a final value from the transfer
function for s → 0 - CThe static gain corresponds to the value of the step input for t → ∞,
but can also be derived as a limit value from the transfer function by
s → 0 multiplied by the Laplace transformed impulse representation. - DFrom the limit value of the system to be controlled considered for
infinitely long time, a statement about the behavior of G(s) at s → 0
can be derived with a step response using the limit value propositions
- AA statement about G(s) can be derived from the static final value
7A polar plot curve along the negative imaginary axis ending at the origin corresponds
- Awithin the amplitude diagram of the Bode diagram, a continuous
increase with increasing frequency - Bwithin the amplitude diagram of the Bode diagram, a continuous
decrease with increasing frequency. - Cwithin the phase diagram of the Bode diagram, a continuous increase
with increasing frequency - Dwithin the phase diagram of the Bode diagram, a continuous decrease
with increasing frequency
- Awithin the amplitude diagram of the Bode diagram, a continuous
8choose
- A© Connecting system 2 and 1 in parallel gives system 3.
- B© Connecting system 2 and 1 in series gives system 3. System 3 is
minimum-phase. - C© Connecting system 2 and 1 in series gives system 3. System 3 is not
an all-pass. - D© Connecting system 2 and 1 in series gives system 3. System system
2 is an all-pass. - E© Connecting system 2 and 1 in series gives system 3. System 1 is not
an all-pass.
9choose
- A© phase-reducing transmission element because 1/T1 < 1/T1D .
- B© phase-raising transmission element because 1/T1 < 1/T1D .
- Cphase-reducing transmission element because the description is in PZform.
- Dphase-reducing transmission element because the description is in
TN-form. - E© phase-reducing transmission element because TD > T.
- F© phase-raising transmission element because TD > T.
10The input/output behavior of a system is defined by the poles s1,2 = 2 ± j, s3 = −3,
and s4 = 0. Considering the poles of the system the input/output behavior has to be
classified as- A© asymptotically stable.
- B© boundary stable.
- C© unstable.
11An open loop with proportional behavior should be controlled stationary accurate. To
achieve this goal ....... part should be integrated into the feedback.- A© a proportional
- B© an integral
- C© a differential
- D© a decelerating
- E© an accelerating
12choose
- A© at the moment t of consideration.
- B© as a description of the entire signal.
- Ccompletion
13In frequency domain the signal u(t) = 1(t − 15) + 2δ(t) can be described as
- Au(s) = −15/s (e−s + 2s).
- B© u(s) = 1/s(e−15s + 2).
- C© u(s) = 1/s(e−15s + 2s).
14Transfer functions are descriptions
- A© in time domain.
- B© in frequency domain.
- C© in time and frequency domain.
15The signal y(s) = G (s) u (s) with G (s) = TDs + 1 and
u (s) = 1s describes with
y (s) =TD + 1s the step response behavior of a- A© PI-system.
- B© PD-system.
- C© PID-system.
16The root locus describes the location of
- A© the stable poles depending on the gain of the system.
The location of unstable poles is not described here - B© all poles depending on the gain of the system.
The location of unstable poles is also described here. - C© the unstable poles depending on the gain of the system.
The location of stable poles is not described here.
- A© the stable poles depending on the gain of the system.
17choose
- A© No, because the gradient does not have to be −20 Dec dB .
- B© No, because the phase of −π for large frequencies is not correct.
- C© Yes, because everything is correct and the system is a PT1-system.
- D© Yes, because everything is correct and the system is a PT2-system.
18choose
- A© Yes, because the shown time delay behavior can exactly be represented
by the polar plot. - B© No, because there are no such curls in a polar plot.
- C© No, because the given course (on the curl) is not correct.
- D© No, because the shown infinite phase shift can not be represented
by the finite time delay
- A© Yes, because the shown time delay behavior can exactly be represented
19The Nyquist curve describes
- Asimilar to the Bode diagram the frequency-dependent amplitude (gain) and phase
behavior - Bdepending on the gain K the stability behavior of an open loop in context with
general or special Nyquist criterion. - Cdepending on the gain K the stability behavior of a closed loop in context with
general or special Nyquist criterion.
- Asimilar to the Bode diagram the frequency-dependent amplitude (gain) and phase
20For the calculation of the transfer function the knowledge of the initial values for
f(t = 0) to f(n−1)(t = 0) with n as highest output derivative order is- A© not necessary.
- B© necessary.
- C© in specific cases necessary.
21The Laplace transformation y(s) of the system behavior described by ˙ y(t)+y(t) = 1(t) is
............... for the both cases ˙ y(t = 0) = 0 and ˙ y(t = 0) = 1 with y(t = 0) = 0.- A© not identical
- B© identical
- C© in general not numerically determinable
22Based on the ............. the state stability of a linear, time invariant system can be evaluated.
- A© eigenvector orientation
- B© eigenvalue location
- C© eigenvalues only in combination with the eigenvectors
23choose
- A© stationary accurate.
- B© not bounded.
- C© not stationary accurate.
24In frequency domain the I/O-behavior of a PD-controller is described by
- A© G(s) = KTDs.
- B© G(s) = K[1 + 1/Ts].
- C© G(s) = K[1 + TDs].
25The relation between time and frequency domain is given by
- A© G(s) = L{h(t)}.
- B© G(s) = L{g(t)}.
- C© H(s) = L{g(t)}.
26For initial conditions ∕= 0 and a bounded input signal ∕= 0 .............. system behavior exists if an exponential rising of the output behavior appears.
- Aunstable
- B© boundary stable
- C© asymptotically stable
27true or falsch
- ATrue
- BFalse
28A.2) A system is not able to oscillate with a negative damping.
- ATrue
- BFalse
29true or falsch
- ATrue
- BFalse
30The Bode-diagram contains the information about amplitude behavior and phase shift of the transfer behavior
- ATrue
- BFalse
31A.5) A transfer element with PIT1-behavior has no zeros.
- ATrue
- BFalse
32true or falsch
- ATrue
- BFalse
33State space models are possible descriptions in time domain and frequency domain
- ATrue
- BFalse
34true or falsch
- ATrue
- BFalse
35true or falsch
- ATrue
- BFalse
36Due to the different stability analysis, a stable I/O-behavior in time domain can be unstable in frequency domain.
- ATrue
- BFalse
37true or falsch
- ATrue
- BFalse
38true or falsch
- ATrue
- BFalse
39true or falsch
- ATrue
- BFalse
40The stimulation of a system with certain frequencies and with a damping
of D = 0.5 can lead to a resonance.- ATrue
- BFalse
41A stable system is also a minimum-phase system.
- ATrue
- BFalse
42true or falsch
- ATrue
- BFalse
43The functions step function, impulse function, and ramp function are
typical output behaviors in control engineering.- ATrue
- BFalse
44true or falch
- ATrue
- BFalse
45The polar plot contains the information about amplitude and phase behavior of the bode diagram, at least qualitative.
- ATrue
- BFalse
46true or falsch
- ATrue
- BFalse
47WAHR oder falsch
- ATrue
- BFalse
48WAHR oder falsch
- ATrue
- BFalse
49WAHR oder falsch
- ATrue
- BFalse
50WAHR oder falsch
- ATrue
- BFalse
51Due to the different stability analysis, an I/O-behavior can be unstable
in time domain and stable in frequency domain.- ATrue
- BFalse
52true or falsch
- ATrue
- BFalse
53true or falsch
- ATrue
- BFalse
54true or falsch
- ATrue
- BFalse
55Assume a transfer system with PDT1-transfer behavior with the coefficients K = 2, T1 = 3, and TD = 4. The static final value is y(t → ∞) = 6
for step excitation with u(t) = 3 · 1(t).- ATrue
- BFalse
56true or falsch
- ATrue
- BFalse
57Time-variant processes can only be described accurately in frequency
domain.- ATrue
- BFalse
58Using the initial and final value theorem of the Laplace transformation,
the limits of the phase shift in time domain for s → 0 and s → ∞ can
be determined- ATrue
- BFalse
59State space models are descriptions only in time domain.
- ATrue
- BFalse
60true or falsch
- ATrue
- BFalse
61true or falsch
- ATrue
- BFalse
62true or felCH
- ATrue
- BFalse
63WAHR or falsch
- ATrue
- BFalse
64WAHR or falsch
- ATrue
- BFalse
65WAHr oder falsch
- ATrue
- BFalse
66WAHR oder falsch
- ATrue
- BFalse
67The relationship between time and frequency domain is defined by h(t) =
L{H(s)}.- ATrue
- BFalse
68Time delays in the transfer behavior of systems are described in frequency domain by zeros and equivalently in time domain by higher order
derivatives of the input variables.- ATrue
- BFalse
69Based on the position of the poles, the state stability of a linear, timeinvariant SISO system can be determined
- ATrue
- BFalse
70C.3) Poles of a system are always also eigenvalues of the system. © ©
- ATrue
- BFalse
71The stimulation with certain frequencies of a system with conjugate
complex poles leads always to a resonanc- ATrue
- BFalse
72C.5) It applies to a stable system behavior: the phase shift for ω → ∞ has to be larger than 0◦. © ©
- ATrue
- BFalse
73true or falsch
- ATrue
- BFalse
74By using Lapla e transformation, time variable signals an be des ribed
in the same quality in frequen y domain- ATrue
- BFalse
75a.3) Step responses are des ription methods in frequen y domain. © ©
- ATrue
- BFalse
76The Bode-diagram des ribes the traje tory of the Bode in a diagram
form. It an be distinguished between the large and small Bode-diagram- ATrue
- BFalse
77The polar plot des ribes the frequen y-dependent amplitude and phase
behavior in a similar way as the Bode-diagram- ATrue
- BFalse
78Using the initial and nal value theorem of the Lapla e transform, the
limits of the orresponding time behavior an be determined from the
Lapla e transformed fun tions.- ATrue
- BFalse
79Based on the position of the poles, the I/O-stability of a linear, timeinvariant SISO-system an be determined.
- ATrue
- BFalse
80A stable proportional system is ex ited by an input signal u(t) = 2epower 3t.
The output y(t) of the system is bounded.- ATrue
- BFalse
81The relation between time domain and frequen y domain is given by
G(s) = L{g(s)}- ATrue
- BFalse
82The stability analysis of linear systems is dierent in time and frequen y
domain due to the non-steady-state hara ter of unstable systems that
an only be addressed in time domain.- ATrue
- BFalse
83c.3
- ATrue
- BFalse
84b.2
- ATrue
- BFalse
85b.5
- ATrue
- BFalse
86true or falsch
- ATrue
- BFalse
87a.2
- ATrue
- BFalse
88a.4
- ATrue
- BFalse
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- Description
- Quiz on Untitled, created by Mostafa Abdelaty on 26/12/2024.
- Author
- Mostafa Abdelaty
- Language
- Deutsch
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