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WorksheetsCONTROL SYSTEMS
Total questions: 20
Worksheet time: 21mins
To increase damping of pair of complex roots compensator used is
Phase lag
Phase lead
Phase lag lead
One with 60° lead circuit
If poles of system are lying on the imaginary axis in s-plane, the system will be
Unstable
Marginally stable
Conditionally stable
Unstable
Which system conveniently see the impact of poles and zeros on phase and gain margin?
Root locus
Nyquist plot
Routh-Hurwitz criterion
Bode plot
To study time delay of the system which of the following is used?
Nyquist plot
Bode plot
Routh Hurwitz method
Nicholas chart
Closed loop poles are
Zeros of 1+G(S). H(s)
Zeros of G(s) H(s)
Poles of G(s) H(s)
Poles of 1 + G(s) H(s)
Feed back control system are basically
Low pass filter
High pass filter
Band pass filter
Band stop filter
Plot of the constant gain loci of the system is
Asymptote
Circle with centre at the origin
Parabola
Ellipse
Frequency response means
Transient response of a system to a sinusoidal input
Steady state response of a system to a sinusoidal input
Oscillatory response of a system to a sinusoidal input
None of these
Gain margin expressed in decibels is
Positive if Kg greater than 1 and negative for Kg less than 1
Negative if Kg greater than 1 and negative for Kg less than 1
Always zero
Infinity for Kg equal to 1
In Nyquist criterion roots of the characteristic equation are given by
Zeros of open loop transfer function
Zeros of closed loop transfer function
Poles of closed loop transfer function
Poles of open loop transfer function
For relative stability of the system which of the following is sufficient?
Gain margin
Phase margin
Both (a) and (b)
None of these
For G(S) F(S) = (k(S+z))/(S+p), (z < p) the plot is
One pole on the imaginary axis
One zero on the right-hand side of the plane
2 poles and 2 zeros on the left-hand side of plane
One pole and one zero on the left-hand side of plane
Bode analysis method can be applied
If transfer function has no poles and zeros on R.H. of s-plane
If transfer function has no poles on R.H. of s-plane
If transfer function has no zero on R.H. of s-plane
To all transfer functions
Cut off is the slope of log-magnitude curve
At the start of curve
At the end of curve
None of these
Near the cut off frequency
Slope in Bode plot is expressed as
– 6 db/decade
– 6 db/octave
– 7 db/octave
– 8 db/octave
Polar plots for+ve and –ve frequencies
Are always symmetrical
Can never be symmetrical
May be symmetrical
None of these
According to the property of state transition method, e0 is equal to _____
I
A
e-At
-eAt
Which mechanism in control engineering implies an ability to measure the state by taking measurements at output?
Controllability
Observability
Differentiability
Adaptability
State model representation is possible using _________
Physical variables
Phase variables
Canonical state variables
All of the above
State space analysis is applicable even if the initial conditions are _____
Zero
Non equal
Equal
Not zero
