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Assertion
(A): Increasing the system gain improves steady state behaviour but may result ininstability.
Reason (R): A compensator is inserted into a system to ensure specified performance
R is correct but A is wrong
Both A and R are correct and R is correct explanation of A
Both A and R are correct but R is not correct explanation of A
A is correct but R is wrong
Consider the following statements relating to synchrosRotor of control transformer is either disc shaped or umbrella shapedRotor of transmitter has low magnetic reluctanceTransmitter and control transformer pair act as error detector Out of above the correct statements are
1 and 3
1, 2, 3
2 and 3
1 and 2
Assertion
(A): Nyquist stability criterion uses the number of encirclements around (-1 + j0) point in GH plane to determine stabilityReason (R): The (-1 + j0) point in the s plane lies in the Nyquist path
A is correct but R is wrong
R is correct but A is wrong
Both A and R are correct and R is correct explanation of A
Both A and R are correct but R is not correct explanation of A
The loop transfer function of a feedback system is
. The number of asymptotes of its root loci are
3
2
4
1
The number of branches of root locus plot is equal to
the number of roots of characteristic equation
the number of roots of characteristic equation minus one
double the number of roots of characteristic equation
the number of roots of characteristic equation plus one
In some on-off controllers a differential gap is provided
Both (a) and (b)
to prevent too often frequent operation of controller
to make the manufacture process easier
Neither (A) Nor (B)
In force current analogy, displacement x is analogous to
charge
Voltage
magnetic flux linkage
electrostatic energy
Assertion
(A): For a given system only one of the static error constants is finite andsignificant.
Reason (R): If finite static error constant is large, the loop gain becomes smaller as ω approaches zero
A is correct but R is wrong
Both A and R are correct and R is correct explanation of A
R is correct but A is wrong
Both A and R are correct but R is not correct explanation of A
For Bode plot of
(1 + jωT) has
slope of - 20 dB/decade and phase angle + tan-1 (ωT)
slope of - 40 dB/decade and phase angle - tan-1(ωT)
slope of 20 dB/decade and phase angle - tan-1 (ωT)
slope of 20 dB/decade and phase angle + tan-1 (ωT)
Transport lag usually exists in
thermal, hydraulic and pneumatic systems
thermal systems
hydraulic systems and thermal systems
pneumatic systems
Assertion
(A): In control system velocity error is not an error in velocity but is an error in position due to a rampinput.
Reason (R): For a type of system velocity error is zero
Both A and R are correct and R is correct explanation of A
A is correct but R is wrong
Both A and R are correct but R is not correct explanation of A
R is correct but A is wrong
The phase difference (jω - p1) means
phasor drawn from origin to p1
phasor directed from jω to p1
phasor drawn from p1 to jω
phasor directed from origin to jω point
For the transfer function , the polar plot a is
semi circle
spiral
Circle
None of the above
Modelling error may occur due to
any of the above
change of plant characteristics with time
neglecting the nonlinear characteristics of plant
inaccuracy of parameters
In a minimum phase system
all poles lie in the left half plane
all except one pole or zero lie in the left half plane
all poles lie in the right half plane
all zeros lie in the left half plane
In an integral controller
the output is proportional to rate of change of input
the output is proportional to input
None of the above
the rate of change of output is proportional to input
The log magnitude plot of the given figure is for
type 0 system
type 2 system
either type 0 or type 1 system
type 1 system
A system has 12 poles and 2zeros.
Its high frequency asymptote in its magnitude plot has a slope of
-200 dB/decade
-280 dB/decade
-240 dB/decade
-320 dB/decade
Assertion
(A): For an underdamped system with damping ratio ξ, the maximum overshoot is e-ξp/
(1-ξ2)0.5Reason (R): Peak time of a second order under damped system = p/ωd where ωd is frequency of damped oscillations
Both A and R are correct and R is correct explanation of A
A is correct but R is wrong
R is correct but A is wrong
Both A and R are correct but R is not correct explanation of A
For very low frequencies, log magnitude for the given figure is
10 dB
0 dB
-3 dB
3 dB
1
2
9
18
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