WorksheetsControl Systems Engineering
Total questions: 69
Worksheet time: 35mins
Name
Class
Date
1.
A major part of the automatic control theory applies to the:
a)
Casual systems
b)
Linear Time invariant systems
c)
Time variant systems
d)
Non-linear systems
2.
Which among the following is not an advantage of an open loop system?
a)
Simplicity in construction & design
b)
Easy maintenance
c)
Rare problems of stability
d)
Requirement of system re calibration from time to time
3.
Which terminology deals with the excitation or stimulus applied to the system from an external source for the generation of an output?
a)
Input signal
b)
Output signal
c)
Error signal
d)
Feedback signal
4.
In a open loop control system
a)
Output is independent of control input
b)
Output is dependent on control input
c)
Output is dependent on control input
d)
none of these
5.
A closed loop system is distinguished from open loop system by which of the following?
a)
Servomechanism
b)
Feedback
c)
Output pattern
d)
Input pattern
6.
Transfer function of a system is used to calculate.
a)
the steady state gain
b)
The time constant
c)
The order of the system
d)
The output for a given input
7.
Which among the following represents an illustration of closed loop system?
a)
Automatic washing machine
b)
Automatic electric iron
c)
Bread toaster
d)
Electric hand drier
8.
By using which of the following elements, mechanical translational systems are obtained?
a)
mass element
b)
Spring element
c)
dash-pot
d)
all options are correct
9.
A good control system has all the following features except
a)
Good stability
b)
Slow response
c)
Good accuracy
d)
Sufficient power handling capacity
10.
A control system in which the control action is somehow dependent on the output is known as
a)
Closed loop system
b)
Semiclosed loop system
c)
Open system
d)
none of these
11.
Which system is also known as automatic control system?
a)
Open loop control system
b)
Closed loop control system
c)
Either 1 or 2
d)
Nither 1 nor 2
12.
Consider reciprocal of capacitance and torsional spring stiffness as analogous quantities. The system is considered as
a)
Torque - voltage
b)
Torque - current
c)
Force - voltage
d)
Force - current
13.
With feedback _____ reduces.
a)
system stability
b)
system gain
c)
system stability and gain
d)
none of these
14.
Electrical analogous quantity for dash-pot in force-current analogy is
a)
Resistance
b)
conductance.
c)
inductance.
d)
capacitance.
15.
Under mechanical rotational system and electrical system the quantities that are not analogous are
a)
Angular velocity and current
b)
Angular displacement and charge
c)
Viscous friction and coefficient resistance
d)
Moment of inertia and conductance
16.
Which of the following are the disadvantages of a closed loop control system?
a)
Reduces the overall gain.
b)
Complex and costly.
c)
Oscillatory response.
d)
all options are correct
17.
By which of the following the control action is determined when a man walks along a path ?
a)
Brain
b)
Hands
c)
Legs
d)
Eyes
18.
Which of the following is the analogous quantity for mass element in force-voltage analogy?
a)
Resistance
b)
Inductance.
c)
Capacitance.
d)
all options are correct
19.
What are the two major components of a synchro
a)
The rotor and the shaft
b)
The housing and the shaft
c)
The housing and the stator
d)
The rotor and the stator
20.
Which of the following is an essential feature of servo-mechanism?
a)
A closed loop system
b)
A power amplifying stage
c)
Ability to control position, velocity or acceleration of the system
d)
all options are correct
21.
What does the arrow on a synchro schematic symbol indicate?
a)
The angular position of the rotor
b)
The direction of current flow
c)
The direction of rotor movement
d)
The angular position of the stator
22.
A.C. servomotor resembles
a)
Two phase induction motor
b)
Three phase induction motor
c)
Direct current series motor
d)
Universal motor
23.
Most common use of the synchros is as
a)
Error detector
b)
Transmission of angular
c)
Transmission of arithmetic data
d)
For synchronization
24.
Which of the following types of synchro devices provides a mechanical output?
a)
A torque transmitter
b)
A control transformer
c)
A torque receiver
d)
A control transmitter
25.
Main difference between servomotor and standard motor is that
a)
Servomotor has low inertia and higher starting torque
b)
Servomotor has inertia low starting torque
c)
Servomotor has high inertia and high starting torque
d)
None of these
26.
Which of the following terms accurately describes a synchro?
a)
Electromechanical
b)
Position-sensing
c)
Rotary
d)
all options are correct
27.
Which of the following is an essential feature of servomechanism?
a)
A closed loop system
b)
A power amplifying stage
c)
Ability to control position, velocity or acceleration of the system
d)
all options are correct
28.
What are the two general classifications of synchro systems?
a)
Torque and control
b)
Load and control
c)
Load and lock
d)
Torque and load
29.
In case of DC servomotor the back-emf is equivalent to an electric friction which tends to :
a)
Improve stability of the motor
b)
Slowly decrease stability of the motor
c)
Vary rapidly decrease stability of the motor
d)
Have no effect on stability
30.
Electrical analogous quantity for dashpot in force-voltage analogy is
a)
Resistance
b)
conductance.
c)
inductance.
d)
Capacitance
31.
What is the difference in application between the two classifications of synchros?
a)
Circular versus straight-line motion
b)
Mechanical versus electrical Output
c)
High-frequency versus low-frequency operation
d)
Light versus Heavy load
32.
Which of the following is an open loop control system?
a)
Field controlled D.C. servomotor
b)
Ward Leonard control
c)
Metadyne
d)
Stroboscope
33.
The components in feedback control system is
a)
Plant
b)
Feedback path element
c)
Error detector
d)
all options are correct
34.
The type of transfer function denotes:
a)
Number of poles at origin
b)
Number of zeros at origin
c)
Number of poles at infinity
d)
Number of zeros at infinity
35.
The transient response of a system having feedback control:
a)
Increases with time
b)
Decays with time
c)
Remains constant with time
d)
First increases then decay
36.
In control systems the feedback means:
a)
Feeding output signal of one device to the input of the other device
b)
Feeding output signal of one device to the input of the two others device
c)
Return of a fraction of the output signal to the input of the same device
d)
None of these
37.
The transfer function of a system is used to study its:
a)
Transient state
b)
Steady-state
c)
Both of these
d)
None of these
38.
Human body is which type of control system:
a)
Open loop
b)
Single feedback
c)
Multiple feedback
d)
none of these
39.
The Temperature control system is:
a)
Process control
b)
Servomechanism
c)
Linear control
d)
None of these
40.
Most common use of the synchros is as
a)
Error detector
b)
Transmission of angular
c)
Transmission of arithmetic data
d)
For synchronization
41.
Match the following notations with their meanings: A. G(s) ---------- 1) Laplace of error signal B. H(s) ---------- 2) Laplace of output signal C. C(s) ---------- 3) Forward transfe functionr D. E(s) ---------- 4) Feedback transfer function
a)
A- 2, B- 3, C- 1, D- 4
b)
A- 3, B- 4, C- 2, D- 1
c)
A- 2, B- 3, C- 4, D- 1
d)
A- 1, B- 2, C- 3, D- 4
42.
A unity feedback system has Open loop Transfer system (s+1), then Closed loop transfer function is
a)
s+1
b)
s-1
c)
s-1/s+3
d)
s+1/s+2
43.
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
44.
The output signal is fed back at the input side from the _________point.
a)
Summing
b)
Differential
c)
Take-off
d)
All of the above
45.
A unity feedback system has Open loop Transfer system s/(s+1), Then Closed loop Transfer function is
a)
s/2s+1
b)
s/s+1
c)
2s/s+2
d)
s/s+2
46.
In a parallel combination, the direction of flow of signals through blocks in parallel must resemble to the main _______.
a)
Forward
b)
Feedback
c)
Opposite
d)
Diagonal
47.
While shifting a take-off point after the summing point, which among the following should be added?
a)
Summing point in series with take-off point
b)
Summing point in parallel with take-off point
c)
Block of reciprocal transfer function
d)
Block of inverse transfer function
48.
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
49.
The relationship between an input and output variable of a signal flow graph is given by the net gain between the input and output node is known as the _______.
a)
Overall gain of the system
b)
Stability
c)
Bandwidth
d)
Speed
50.
Signal flow graphs:
a)
They apply to linear systems
b)
The equation obtained may or may not be in the form of cause or effect
c)
Arrows are not important in the graph
d)
They cannot be converted back to block diagram
51.
Loop which do not possess any common node are said to be ___________ loops.
a)
Forward gain
b)
Touching loops
c)
Non touching loops
d)
Feedback gain
52.
In a signal flow graph, nodes are represented by small _____.
a)
Squares
b)
Arrows
c)
Pointer
d)
Circles
53.
According to signal flow graph, which among the following represents the relationship between nodes by drawing a line between them?
a)
Branch
b)
Self-loop
c)
Semi-node
d)
Mesh
54.
For which systems are the signal flow graphs applicable?
a)
Causal
b)
Invertible
c)
Linear time invariant system
d)
Dynamic
55.
A node having only outgoing branches.
a)
Input node
b)
Output node
c)
Incoming node
d)
Outgoing node
56.
Signal flow graph is a graphical representation of algebraic equations.
a)
Statement is correct
b)
Statement is incorrect
c)
Can be correct or incorrect
d)
Can not say
57.
Which of the following are the basic elements of signal flow graph?
a)
Node
b)
Branch
c)
Leaf
d)
node and branch
58.
How many types of nodes there?
a)
1
b)
2
c)
3
d)
4
59.
Which node has only incoming branches?
a)
Input Node
b)
Output Node
c)
Mixed Node
d)
All of these
60.
Branch is a line segment which joins _______ nodes.
a)
1
b)
2
c)
3
d)
4
61.
Loop which do not possess any common node are said to be ___________ loops.
a)
Forward gain
b)
Touching loops
c)
Non touching loops
d)
Feedback gain
62.
Signal flow graphs:
a)
They apply to linear systems
b)
The equation obtained may or may not be in the form of cause or effect
c)
Arrows are not important in the graph
d)
They cannot be converted back to block diagram
63.
The relationship between an input and output variable of a signal flow graph is given by the net gain between the input and output node is known as the overall______________
a)
Stability
b)
Bandwidth
c)
Speed
d)
Overall gain of the system
64.
Nodes represent all the signals, variables, summing points and take-off points.
a)
Yes
b)
No
c)
Can be yes or no
d)
Can not say
65.
Mixed Node is a node, which has both incoming and outgoing branches.
a)
Statement is correct
b)
Statement is incorrect
c)
Can be correct or incorrect
d)
Can not say
66.
Standard test signals in control system are:
a)
Impulse signal
b)
Ramp signal
c)
Unit step signal
d)
All of the mentioned
67.
Ramp input :
a)
Denotes constant velocity
b)
Value increases linearly with time
c)
It denotes constant velocity and varies linearly with time
d)
It varies exponentially with time
68.
Find the type and order of the system given as k/s^2(s+9)
a)
2,3
b)
2,2
c)
3,3
d)
None of the mentioned
69.
First Order System is defined as
a)
Numbers of poles at origin
b)
Order of the differential equation
c)
Total number of poles of equation
d)
Total number of poles and order of equation
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