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WorksheetsQuiz on Bode & Nyquist Plot
Total questions: 58
Worksheet time: 29mins
What is the technique to solve stability problem?
Cramer's rule
Block reduction
Routh Hurwits Criterion
A linear system is stable if it is able to give the same output when used to measure a constant input over a period of time
True
False
If the poles of system is in the left half of the complex s-plane, the system is (a)
When build Routh table, in the most left column, fill the sn starting with the _________
Lowest
Highest
Tick the right step when fill in the Routh table
Fill the table with the coefficients from the characteristic equation (denominator)
Fill the 2nd row with the skipped coefficients
Fill the rest of the table with the modified determinant formula
Interpret the first column of Routh table to see changes of sign
Identify poles location
When there is Zero in the first column in Routh table
The system is unstable
Replace with ε to carry on with the calculation
Which system conveniently see the impact of poles and zeros on phase and gain margin?
Root locus
Nyquist plot
Routh Hurwitz criterion
Bode Plot
If poles of system are lying on the imaginary axis in s-plane, the system will be
Unstable
Marginally stable
Conditionally stable
Stable
Phase margin of a system is used to specify which of the following ?
Frequency response
Relative stability
Time response
Absolute stability
Which one of the following methods can determine the closed loop system resonance frequency operation?
Root locus method
Nyquist method
Bode plot
M and N circle
The advantage of block diagram representation is that it is possible to evaluate the contribution of each component to the overall performance of the system.
a) True
b) False
6. The overall transfer function from block diagram reduction for cascaded blocks is :
a) Sum of individual gain
b) Product of individual gain
c) Difference of individual gain
d) Division of individual gain
The overall transfer function of two blocks in parallel are :
a) Sum of individual gain
b) Product of individual gain
c) Difference of individual gain
d) Division of individual gain
Transfer function of the system is defined as the ratio of Laplace output to Laplace input considering initial conditions________
a) 1
b) 2
c) 0
d) infinite
Oscillations in output response is due to :
a) Positive feedback
b) Negative feedback
c) No feedback
d) None of the mentioned
WHAT IS THE ANOTHER NAME FOR TAKE OFF POINT
RESISTOR
BRANCH POINT
SUMMING POINT
DOT POINT
A Control System is a system in which the output is controlled by varying the input. Identify the types of control system. (CO1)
i. Open loop
ii. Closed loop
iii. Open End loop
i and iii
ii and iii
i and ii
all the above
In the automatic washing machine system, the operating time is set manually. After the completion of the set time, the machine stops whether the desired cleanness is obtained or not because there is no feedback signal which the machine can sense. Identify the type of control system. (CO1)
(a)
There are disadvantages of open loop control system.
a) Open loop systems are inaccurate.
b) These systems are not reliable.
c) These are slow.
d) Optimization is not possible.
True or False? (CO1)
False
True
Some true and some false
No idea
A closed loop control system is a system in which control action is dependent on the desired output. There are examples of closed loop except (CO1)
Automatic electric iron.
Immersion rod
An air conditioner.
Servo voltage stabilizer.
The control system may be classified in a number of ways. One of them, is depending on the methods analysis and design, the system can be linear or non-linear.
A system is known as linear if and only if it possesses ________________ (CO1)
homogeneity and superposition properties.
not directly proportional to its input
parameter vary with time
not satisfy the superposition and homogeneity property
The process of drawing the block diagram for mechanical and electrical systems to find the performance and the transfer functions is called the (a) of the control system. (CO1)
The characteristic equation of a linear system can be obtained by equating the denominator to the polynomial of a transfer function is _____ (CO1)
zero
one
infinity
none the answers
SFG is a graphical representation of the relationship between the variables of a set of linear algebraic equations. It does not require any reduction technique or process. Identify the characteristics of SFG. (CO1)
It represents a network in which nodes are used for the representation of system variable which is connected by direct branches.
It is only applicable to the linear system.
SFG is a diagram which represents a set of equations.
It consists of nodes and branches such that each branch of SFG having an arrow which represents the flow of the signal.
In controller with derivative control action the output of the controller depends on the rate of change of the e(t). What is Kd? (CO1)
(a)
The force equation of the given system is:
F = K(d2x/dt2) + f (dx/dt) + Mx
F = f(d2x/dt2) + M(dx/dt) + Kx
F = M(d2x/dt2) + f (dx/dt) + Kx
F = K(d2x/dt2) + M (dx/dt) + fx
The mechanism of control of body temperature is Non Feedback system.
True
False
Multiple signals as input can be used in which systems:
Feedback systems
Non Feedback systems
Feed Forward systems
None of the mentioned
In an open loop control system
Output is dependent on control input
Only system parameters have effect on the control output
Output is independent on control input
None of the above
A control system in which the control action is somehow dependent on the output is known as
Semi-closed loop system
Closed loop system
Open loop system
None of the above
A car is moving at a constant speed of 50 km/h, which of the following is the feedback element for the driver ?
Clutch
Eyes
Needle of speedometer
Steering wheel
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 force-voltage analogy, velocity is analogous to
Current
Charge
Inductance
Capacitance
The viscous friction co-efficient, in force-voltage analogy, is analogous to
Charge
Resistance
Reciprocal of inductance
Reciprocal of conductance
Mass, in force-voltage analogy, is analogous to
Charge
Current
Inductance
Resistance
Spring constant in force-voltage analogy is analogous to
Capacitance
Current
Resistance
Reciprocal of capacitance
In translational mechanical system the opposing force offered by mass, dashpot, spring is proportional to
Load, Friction, Elasticity
Speed, Velocity, Length
Acceleration, Velocity, Displacement
Acceleration, Viscosity, Duration
Force acting on a mechanical body are governed by
Newtons first law of motion
Newtons second law of motion
Faradays law of electromagnetic induction
Mechanical law of motion
To model a rotational mechanical system the three basic elements required are denoted by
M, B, K
J, B, K
G, K, J
M, B, J
Transfer function of a system is defined as the ratio of output to input in
Z-transformer
Fourier transform
Laplace transform
All of these
How is an output represented in the control systems?
r(t)
x(t)
c(t)
y(t)
What is the use of encoder in servo motor?
It provides position and speed feedback
For low rotor inertia
For high speed
Direction of rotation of AC servo motor is changed by
By changing supply terminal
By changing current in rotor
By changing the phase difference between the two voltages
Rotor of AC servo motor is
Wire wound
Squirrel cage
Drag cup type
Both wire wound and drag cup
Applications of servo motors (check all true statements)
Robotics
Aeroplane
CNC machinery
Traction
A DC servo motor
Uses a tachometer for speed feedback
Uses a variable dc voltage for speed control
Can provide precise position control
All of the above
