Linear
Programming Problem
Multiple Choice
Question & Answer:-
1. In an open loop
control system
(a) Output is
independent of control input
(b) Output is
dependent on control input
(c) Only system
parameters have effect on the control output
(d) None of the
above
Ans: a
2. For open control
system which of the following statements is incorrect ?
(a) Less expensive
(b) Recalibration is
not required for maintaining the required quality of the output
(c) Construction is
simple and maintenance easy
(d) Errors are
caused by disturbances
Ans: b
3. 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 the
above
Ans: a
4. In closed loop
control system, with positive value of feedback gain the overall gain of the
system will
(a) decrease
(b) increase
(c) be unaffected
(d) any of the above
Ans: a
5. Which of the
following is an open loop control system ?
(a) Field controlled
D.C. motor
(b) Ward leonard
control
(c) Metadyne
(d) Stroboscope
Ans: a
6. Which of the
following statements is not necessarily correct for open control system ?
(a) Input command is
the sole factor responsible for providing the control action
(b) Presence of
non-linearities causes malfunctioning
(c) Less expensive
(d) Generally free
from problems of non-linearities
Ans: b
7. In open loop
system
(a) the control
action depends on the size of the system
(b) the control
action depends on system variables
(c) the control
action depends on the input signal
(d) the control
action is independent of the output
Ans: d
8 has tendency to
oscillate.
(a) Open loop system
(b) Closed loop
system
(c) Both (a) and (b)
(d) Neither (a) nor
(b)
Ans: b
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
Ans: b
10. A car is raining
at a constant speed of 50 km/h, which of the following is the feedback element
for the driver ?
(a) Clutch
(b) Eyes
(c) Needle of the
speedometer
(d) Steering wheel
(e) None of the
above
Ans: c
11. The initial
response when tne output is not equal to input is called
(a) Transient
response
(b) Error response
(c) Dynamic response
(d) Either of the
above
Ans: a
12. A control system
working under unknown random actions is called
(a) computer control
system
(b) digital data
system
(c) stochastic
control system
(d) adaptive control
system
Ans: c
13. An automatic
toaster is a ______ loop control system.
(a) open
(b) closed
(c) partially closed
(d) any of the above
Ans: a
14. Any externally
introduced signal affecting the controlled output is called a
(a) feedback
(b) stimulus
(c) signal
(d) gain control
Ans: b
15. 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
Ans: b
16 is a part of the
human temperature control system.
(a) Digestive system
(b) Perspiration
system
(c) Ear
(d) Leg movement
Ans: b
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
Ans: d
18 is a closed loop
system.
(a) Auto-pilot for
an aircraft
(6) Direct current
generator
(c) Car starter
(d) Electric switch
Ans: a
19. Which of the
following devices are commonly used as error detectors in instruments ?
(a) Vernistats
(b) Microsyns
(c) Resolvers
(d) Any of the above
Ans: d
20. Which of the
following should be done to make an unstable system stable ?
(a) The gain of the
system should be decreased
(b) The gain of the
system should be increased
(c) The number of
poles to the loop transfer function should be increased
(d) The number of
zeros to the loop transfer function should be increased
Ans: b
21 increases the
steady state accuracy.
(a) Integrator
(b) Differentiator
(c) Phase lead
compensator
(d) Phase lag
compensator
Ans: a
22. A.C. servomotor
resembles
(a) two phase
induction motor
(b) Three phase
induction motor
(c) direct current
series motor
(d) universal motor
Ans: a
23. As a result of
introduction of negative feedback which of the following will not decrease ?
(a) Band width
(b) Overall gain
(c) Distortion
(d) Instability
Ans: a
24. Regenerative
feedback implies feedback with
(a) oscillations
(b) step input
(c) negative sign
(d) positive sign
Ans: d
25. The output of a
feedback control system must be a function of
(a) reference and
output
(b) reference and
input
(e) input and
feedback signal
(d) output and
feedback signal
Ans: a
26 is an open loop
control system.
(a) Ward Leonard
control
(b) Field controlled
D.C. motor
(c) Stroboscope
(d) Metadyne
Ans: b
27. A control system
with excessive noise, is likely to suffer from
(a) saturation in
amplifying stages
(b) loss of gain
(c) vibrations
(d) oscillations
Ans: a
28. Zero initial
condition for a system means
(a) input reference
signal is zero
(b) zero stored
energy
(c) ne initial
movement of moving parts
(d) system is at
rest and no energy is stored in any of its components
Ans: d
29. Transfer
function of a system is used to calculate which of the following ?
(a) The order of the
system
(b) The time
constant
(c) The output for
any given input
(d) The steady state
gain
Ans: c
30. The band width,
in a feedback amplifier.
(a) remains
unaffected
(b) decreases by the
same amount as the gain increase
(c) increases by the
sane saaaajajt as the gain decrease
(d) decreases by the
same amount as the gain decrease
Ans: c
31. On which of the
following factors does the sensitivity of a closed loop system to gain changes
and
load disturbances
depend ?
(a) Frequency
(b) Loop gain
(c) Forward gain
(d) All of the above
Ans: d
32. The transient
response, with feedback system,
(a) rises slowly
(b) rises quickly
(c) decays slowly
(d) decays quickly
Ans: d
33. The second
derivative input signals modify which of the following ?
(a) The time
constant of the system
(b) Damping of the
system
(c) The gain of the
system
(d) The time
constant and suppress the oscillations
(e) None of the
above
Ans: d
34. Which of the
following statements is correct for any closed loop system ?
(a) All the
co-efficients can have zero value
(6) All the
co-efficients are always non-zero
(c) Only one of the
static error co-efficients has a finite non-zero value
(d) None of the
above
Ans: c
35. Which of the
following statements is correct for a system with gain margin close to unity or
a phase margin close to zero ?
(a) The system is
relatively stable
(b) The system is
highly stable
(c) The system is
highly oscillatory
(d) None of the
above
Ans: c
36. Due to which of
the following reasons excessive bond width in control systems should be avoided
?
(a) It leads to slow
speed of response
(b) It leads to low
relative stability
(c) Noise is
proportional to band width
(d) None of the
above
Ans: c
37. In a stable
control system backlash can cause which of the following ?
(a) Underdamping
(b) Overdamping
(c) Poor stability
at reduced values of open loop gain
(d) Low-level
oscillations
Ans: d
38. In an automatic
control system which of the following elements is not used ?
(a) Error detector
(b) Final control
element
(c) Sensor
(d) Oscillator
Ans: d
39. In a control
system the output of the controller is given to
(a) final control
element
(b) amplifier
(c) comparator
(d) sensor
(e) none of the
above
Ans: a
40. A controller,
essentially, is a
(a) sensor
(b) clipper
(c) comparator
(d) amplifier
Ans: c
41. Which of the
following is the input to a controller ?
(a) Servo signal
(b) Desired variable
value
(c) Error signal
(d) Sensed signal
Ans:
42. The on-off
controller is a _____ system.
(a) digital
(b) linear
(c) non-linear
(d) discontinuous
Ans:
43. The capacitance,
in force-current analogy, is analogous to
(a) momentum
(b) velocity
(c) displacement
(d) mass
Ans: d
44. The temperature,
under thermal and electrical system analogy, is considered analogous to
(a) voltage
(b) current
(c) capacitance
(d) charge
(e) none of the
above
Ans: a
45. In
electrical-pneumatic system analogy the current is considered analogous to
(a) velocity
(b) pressure
(c) air flow
(d) air flow rate
Ans: d
46. In liquid level
and electrical system analogy, voltage is considered analogous to
(a) head
(b) liquid flow
(c) liquid flow rate
(d) none of the
above
Ans: a
47. The viscous
friction co-efficient, in force-voltage analogy, is analogous to
(a) charge
(b) resistance
(c) reciprocal of
inductance
(d) reciprocal of
conductance
(e) none of the
above
Ans: b
48. In force-voltage
analogy, velocity is analogous to
(a) current
(b) charge
(c) inductance
(d) capacitance
Ans: a
49. In
thermal-electrical analogy charge is considered analogous to
(a) heat flow
(b) reciprocal of
heat flow
(c) reciprocal of
temperature
(d) temperature
(e) none of the
above
Ans: d
50. Mass, in
force-voltage analogy, is analogous to
(a) charge
(b) current
(c) inductance
(d) resistance
Ans: c
51. The transient
response of a system is mainly due to
(a) inertia forces
(b) internal forces
(c) stored energy
(d) friction
Ans: c
52 signal will
become zero when the feedback signal and reference signs are equal.
(a) Input
(b) Actuating
(c) Feedback
(d) Reference
Ans: b
53. A signal other
than the reference input that tends to affect the value of controlled variable
is known
as
(a) disturbance
(b) command
(c) control element
(d) reference input
Ans: a
54. The transfer
function is applicable to which of the following ?
(a) Linear and
time-in variant systems
(b) Linear and
time-variant systems
(c) Linear systems
(d) Non-linear systems
(e) None of the
above
Ans: a
55. From which of
the following transfer function can be obtained ?
(a) Signal flow
graph
(b) Analogous table
(c) Output-input
ratio
(d) Standard block
system
(e) None of the
above
Ans: a
56 is the reference
input minus the primary feedback.
(a) Manipulated
variable
(b) Zero sequence
(c) Actuating signal
(d) Primary feedback
Ans: c
57. The term
backlash is associated with
(a) servomotors
(b) induction relays
(c) gear trains
(d) any of the above
Ans:
58. With feedback
_____ increases.
(a) system stability
(b) sensitivity
(c) gain
(d) effects of
disturbing signals
Ans: a
59. By which of the
following the system response can be tested better ?
(a) Ramp input
signal
(b) Sinusoidal input
signal
(c) Unit impulse
input signal
(d) Exponentially
decaying signal
Ans: c
60. In a system zero
initial condition means that
(a) The system is at
rest and no energy is stored in any of its components
(b) The system is
working with zero stored energy
(c) The system is
working with zero reference signal
Ans: a
61. In a system low
friction co-efficient facilitates
(a) reduced velocity
lag error
(b) increased
velocity lag error
(c) increased speed
of response
(d) reduced time
constant of the system
Ans: a
62. Hydraulic torque
transmission system is analog of
(a) amplidyneset
(b)
resistance-capacitance parallel circuit
(c) motor-generator
set
(d) any of the above
Ans:
63. Spring constant
in force-voltage analogy is analogous to
(a) capacitance
(b) reciprocal of
capacitance
(c) current
(d) resistance
Ans: b
64. The frequency
and time domain are related through which of the following?
(a) Laplace
Transform and Fourier Integral
(b) Laplace
Transform
(c) Fourier Integral
(d) Either (b) or
(c)
Ans: a
65. An increase in
gain, in most systems, leads to
(a) smaller damping
ratio
(b) larger damping
ratio
(c) constant damping
ratio
(d) none of the
above
Ans: a
66. Static error
coefficients are used as a measure of the effectiveness of closed loop systems
for
specified ________
input signal.
(a) acceleration
(b) velocity
(c) position
(d) all of the above
Ans: d
67. A conditionally
stable system exhibits poor stability at
(a) low frequencies
(b) reduced values
of open loop gain
(c) increased values
of open loop gain
(d) none of the
above
Ans: b
68. The type 0
system has ______ at the origin.
(a) no pole
(b) net pole
(c) simple pole
(d) two poles
(e) none of the
above
Ans: a
69. The type 1
system has ______ at the origin.
(a) no pole
(b) net pole
(c) simple pole
(d) two poles
Ans: c
70. The type 2
system has ______ at the origin.
(a) no net pole
(b) net pole
(c) simple pole
(d) two poles
Ans: d
71. The position and
velocity errors of a type-2 system are
(a) constant,
constant
(b) constant,
infinity
(c) zero, constant
(d) zero, zero
Ans: c
72. Velocity error
constant of a system is measured when the input to the system is unit _______
function.
(a) parabolic
(b) ramp
(c) impulse
(d) step
Ans: b
73. In case of
type-1 system steady state acceleration is
(a) unity
(b) infinity
(c) zero
(d) 10
Ans: b
74. If a step
function is applied to the input of a system and the output remains below a
certain level for all the time, the system is
(a) not necessarily
stable
(b) stable
(c) unstable
(d) always unstable
(e) any of the above
Ans: a
75. Which of the following
is the best method for determining the stability and transient response ?
(a) Root locus
(b) Bode plot
(c) Nyquist plot
(d) None of the
above
Ans: a
76. Phase margin of
a system is used to specify which of the following ?
(a) Frequency
response
(b) Absolute
stability
(c) Relative
stability
(d) Time response
Ans: c
77. Addition of
zeros in transfer function causes which of the following ?
(a)
Lead-compensation
(b) Lag-compensation
(c) Lead-lag
compensation
(d) None of the
above
Ans: b
78. technique is not
applicable to nonlinear system ?
(a) Nyquist
Criterion
(b) Quasi
linearization
(c) Functional
analysis
(d) Phase-plane
representation
Ans: a
79. In order to
increase the damping of a badly underdamped system which of following
compensators may be used ?
(a) Phase-lead
(b) Phase-lag
(c) Both (a) and (b)
(d) Either (a) and
(b)
(e) None of the
above
Ans: a
80. The phase lag
produced by transportation relays
(a) is independent
of frequency
(b) is
inverseh’proportional to frequency
(c) increases
linearly with frequency
(d) decreases
linearly with frequency
Ans: c
81. In a stable
control system saturation can cause which of the following ?
(a) Low-level
oscillations
(b) High-level
oscillations
(c) Conditional
stability
(d) Overdamping
Ans:
82. Which of the
following can be measured by the use of a tachogenerator ?
(a) Acceleration
(b) Speed
(c) Speed and
acceleration
(d) Displacement
(e) None of the
above
Ans: b
83 is not a final
control element.
(a) Control valve
(b) Potentiometer
(c) Electropneumatic
converter
(d) Servomotor
Ans: b
84. Which of the
following is the definition of proportional band of a controller ?
(a) The range of air
output as measured variable varies from maximum to minimum
(b) The range of measured
variables from set value
(c) The range of
measured variables through which the air output changes from maximum to minimum
(d) Any of the above
(e) None of the
above
Ans: c
85. In pneumatic
control systems the control valve used as final control element converts
(a) pressure signal
to electric signal
(b) pressure signal
to position change
(c) electric signal
to pressure signal
(d) position change
to pressure signal
(e) none of the
above
Ans: b
86. Pressure error
can be measured by which of the following ?
(a) Differential
bellows and straingauge
(b) Selsyn
(c) Strain gauge
(d) Strain gauge and
potentiometer
Ans: a
87. Which of the
following devices is used for conversion of co-ordinates ?
(a) Microsyn
(b) Selsyn
(c) Synchro-resolver
(d)
Synchro-transformer
Ans: c
88. The effect of
error damping is to
(a) provide larger
settling lime
(b) delay the
response
(c) reduce steady
state error
(d) any of the above
(e) none of the
above
Ans: c
89 technique gives
quick transient and stability response
(a) Root locus
(b) Bode
(c) Nyquist
(d) Nichols
Ans: a
90. A phase lag lead
network introduces in the output
(a) lag at all
frequencies
(b) lag at high
frequencies and lead at low frequencies
(c) lag at low
frequencies and lead at high frequencies
(d) none of the
above
Ans: c
91. Which of the
following is the non-linearity caused by servomotor ?
(a) Static friction
(b) Backlash
(c) Saturation
(d) None of the
above
Ans: c
92 can be extended to
systems which are time-varying ?
(a) Bode-Nyquist
stability methods
(b) Transfer
functions
(c) Root locus
design
(d) State model
representatives
Ans: d
93. When the initial
conditions of a system are specified to be zero it implies that the system is
(a) at rest without
any energy stored in it
(b) working normally
with reference input
(c) working normally
with zero reference input
(d) at rest but
stores energy
Ans: d
94. Which of the
following is an electromagnetically device ?
(a) Induction relay
(b) Thermocouple
(c) LVDT
(d) Any of the above
(e) None of the
above
Ans: c
95. A differentiator
is usually not a part of a control system because it
(a) reduces damping
(b) reduces the gain
margin
(c) increases input
noise
(d) increases error
Ans: c
96. If the gain of
the critical damped system is increased it will behave as
(a) oscillatory
(b) critically
damped
(c) overdamped
(d) underdamped
(e) none of the
above
Ans: d
97. In a control
system integral error compensation _______ steady state error
(a) increases
(b) minimizes
(c) does not have
any effect on
(d) any of the above
Ans: b
98. With feed back
_____ reduces.
(a) system stability
(6) system gain
(c) system stability
and gain
(d) none of the
above
Ans: b
99. An amplidyne can
give which of the following characteristics ?
(a) Constant current
(b) Constant voltage
(c) Constant current
as well as constant voltage
(d) Constant
current, constant voltage and constant power
(e) None of the
above
Ans: d
100. Which of the
following can be measured by LVDT?
(a) Displacement
(b) Velocity
(c) Acceleration
(d) Any of the above
Ans: d
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