The open loop transfer function of the feedback control system is given by G(s) = K(s+3)/s(s+4)2(s+5)(s+6). The number of asymptotes and the centroid of asymptotes of the root loci of closed loop system is?
a) -4 and (-4,0)
b) 4 and (-4,0)
c) -3 and (-12,0)
d) 3 and (-12,0)
Q.2.
With negative feedback in a closed loop control system, the system sensitivity to parameter variation:
a) Becomes infinite
b) Becomes zero
c) Decreases
d) Increases
Q.3.
What is Control System?
a) Control system is a system in which the output is controlled by varying the input
b) Control system is a device that will not manage or regulate the behaviour of other devices using control loops
c) Control system is a feedback system that can be both positive and negative
d) Control System is a system in which the input is controlled by varying the output
Q.4.
Which of the following is not the feature of a modern control system?
a) Correct power level
b) No oscillation
c) Quick response
d) Accuracy
Q.5.
What is the characteristic of a good control system?
a) Insensitive to the parameter variation but sensitive to the input commands
b) Neither sensitive to parameter variations nor sensitive to input commands
c) Insensitive to the input command
d) Sensitive to parameter variation
Q.6.
Which of the following element is not used in an automatic control system?
a) Final control element
b) Sensor
c) Oscillator
d) Error detector
Q.7.
A control system working under unknown random actions is called ____________
a) Adaptive control system
b) Stochastic control system
c) Computer control system
d) Digital data system
Q.8.
Which of the following is an open loop control system?
a) Ward Leonard control
b) Metadyne
c) Stroboscope
d) Field controlled D.C. motor
Q.9.
Which of the following statements is correct for any closed loop system?
a) Only one of the static error co-efficient has a finite non-zero value
b) All the co-efficient can have zero value
c) All the co-efficient are always non-zero
d) All of the mentioned
Q.10.
What should be the nature of bandwidth for a good control system?
a) Small
b) Medium
c) Large
d) All of the mentioned
Q.11.
The output of the feedback control system must be a function of ____________
a) Output and feedback signal
b) Input and feedback signal
c) Reference input
d) Reference output
Q.12.
Which of the following statement is true about Feedback control system?
a) Equally sensitive to forward feedback path parameter changes
b) Insensitive to both forward and feedback path parameter changes
c) Less sensitive to feedback path parameter changes than to forward path parameter changes
d) Less sensitive to forward path parameter changes than to feedback path parameter changes
Q.13.
In a stable control system backlash can cause which of the following?
a) Overdamping
b) Low-level oscillations
c) Underdamping
d) Poor stability at reduced values of open loop gain
Q.14.
In a control system the output of the controller is given to
a) Amplifier
b) Sensor
c) Final control element
d) Comparator
Q.15.
A Control System with excessive noise, is likely to suffer from which of the following?
a) Oscillations
b) Saturation in amplifying stages
c) Loss of gain
d) Vibrations
Q.16.
In a temperature control system, what conversion in signal takes place?
a) Error to Digital
b) Error to Analog
c) Digital to Analog
d) Analog to Digital
Q.17.
Which of the following control systems have unpredictable & non-repeatable?
a) Stochastic control systems
b) Deterministic control systems
c) Static control systems
d) Dynamic control systems
Q.18.
In pneumatic control systems the control valve used as the final control element converts
a) Position change to pressure signal
b) Electric signal to pressure signal
c) Pressure signal to electric signal
d) Pressure signal to position change
Q.19.
Consider the following statements with respect to the feedback of the control systems.
a) i, ii, iii and iv only
b) i, ii and iii only
c) i, iii and iv only
d) i, ii and iv only
Q.20.
In closed loop control system, what is the sensitivity of the gain of the overall system, M to the variation in G?
a) G/1GH
b) 1/1+GH
c) G/1+G
d) 1/1+G
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