WorksheetsUN No. 4 Introduction to Control Systems
Total questions: 40
Worksheet time: 40mins
Traffic signal used for controlling the traffic across cross road is a
Closed loop control system
System
Open loop control system
None of these
A person driving car and required to maintain speed the car at 60 km/hr is an example of
Open loop system
Closed loop system
Automatic control system
Discrete control system
In an open loop control system
Output is independent of control input
. Output is dependent on control input
Only system parameters have effect on the control output
None of the above
In closed loop control system, with positive value of feedback gain the overall gain of the system will
decrease
increase
be unaffected
any of the above
Which of the following is an open loop control system?
Field controlled D.C. motor
Ward leonard control
Metadyne
Stroboscope
An automatic toaster is a loop control system.
open
closed
partially closed
any of the above
For open control system which of the following statements is incorrect?
Less expensive
Recalibration is not required for maintaining the required quality of the output
Construction is simple and maintenance easy
Errors are caused by disturbances
A control system in which the control action is somehow dependent on the output isknown as
Closed loop system
Semi closed loop system
Open system
None of the above
In closed loop control system, with positive value of feedback gain the overall gain ofthe system will
Decrease
Increase
be unaffected
any of the above
Which of the following is an open loop control system?
Field controlled D.C. motor
Ward Leonard control
Metadyne
Stroboscope
Which of the following statements is not necessarily correct for open control system?
Input command is the sole factor responsible for providing the control action
Presence of nonlinearity’s causes malfunctioning
Less expensive
. Generally free from problems of non-linearities
In open loop system
the control action depends on the size of the system
the control action depends on system variables
the control action depends on the input signal
the control action is independent of the output
---------has tendency to oscillate
Open loop system
Closed loop system
Both (a) and (b)
Neither (a) nor (b)
A good control system has all the following features except
good stability
slow response
good accuracy
. sufficient power handling capacity
A car is running at a constant speed of 50 km/h, which of the following is the feedback Element for the driver?
Clutch
Eyes
Needle of the speedometer
Steering wheel
The initial response when the output is not equal to input is called
Transient response
Error response
Dynamic response
Either of the above
A control system working under unknown random actions is called
computer control system
. digital data system
stochastic control system
adaptive control system
An automatic toaster is a loop control system.
Open
Closed
partially closed
any of the above
Any externally introduced signal affecting the controlled output is called a
Feedback
Stimulus
Signal
gain control
A closed loop system is distinguished from open loop system by which of the following?
Servomechanism
Feedback
Output pattern
Input pattern
Is a part of the human temperature control system?
Digestive system
Perspiration system
Ear
Leg movement
By which of the following the control action is determined when a man walks along a path?
Brain
Hands
Legs
Eyes
Is a closed loop system.
Auto-pilot for an aircraft
Direct current generator
Car starter
Electric switch
Which of the following devices are commonly used as error detectors in instruments?
Vern stats
Microsyns
Resolvers
Any of the above
‘Traffic signal system’ is an example of
Open loop control
Closed loop control
Manual control
P-control
Forward transfer function of a closed loop control S K N Si n hgs a d C o l l eg ey of E n gi n e er i n gstem is defined as
Output/input
Input/output
Output/actuating signal
Actuating signal/output
The most expensive control system is
Manually controlled
Open-loop
Closed-loop
Uncontrolled system
A rider riding a bike is an example of
Manual open loop system
Manual closed loop system
Automatic open loop system
Automatic closed loop system
Air Conditioning system in Indian Railways is an example of
open loop control system
closed loop control system
manual controlsystem
semi-automatic control system
Closed loop T.F. for a system with negative feedback is given by
G(s)/1-G(s) H(s)
G(s)/1+G(s) H(s)
H(s)/1+G(s) H(s)
H(s)/1-G(s) H(s)
In a block diagram algebra ,a circle indicates
Multiplication
integration
addition or subtraction
differentiation
Transfer function of a system is used to calculate which of the following?
The order of the system
The time constant
The output for any given input
The steady state gain
In a feedback control system, if G1 is the feed-forward function H1 is the feedback function to give negative feedback, then the closed loop transfer function C(S)/R(S) is given by
H1/1+G1H1
G1/1-G1H1
H1/1-G1H1
G1/1+G1H1
In block diagram algebra, parallel blocks are
Divided
Integrated
Multiplied
Added or subtracted
The best control can be achieved with
P-control
I- control
P+D- control
P+I+D control
Derivative time is given by
Kp/Kd
Kp. Kd
Kd.e
Kd/Kp
The controller lines in steady state characteristics are vertical for
Derivative mode
Proportional
mode
On-Off mode
Integral mode
Control action which is never used alone is
P-control
I- control
D- control
None of the above
----------------control mode or action considers the error which are going to occur in future & applies the correction in anticipation these errors.
Derivative
Integral
On Off
Proprtional
While shifting a summing point after a block, we have to
add the same block
divide by same block
subtract same block
multiply by same block
