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Free download in PDF Control System Objective Type Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(21)
A controller, essentially, is a
[A]
sensor
[B]
clipper
[C]
comparator
[D]
amplifier
(22)
In a control system the output of the controller is given to
[A]
final control element
[B]
amplifier
[C]
comparator
[D]
sensor
Answer: final control element
(23)
In an automatic control system which of the following elements is not used ?
[A]
Error detector
[B]
Final control element
[C]
Sensor
[D]
Oscillator
(24)
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
Answer: Low-level oscillations
(25)
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
Answer: Noise is proportional to band width
(26)
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
Answer: The system is highly oscillatory
(27)
Which of the following statements is correct for any closed loop system ?
[A]
All the co-efficients can have zero value
[B]
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
Answer: Only one of the static error co-efficients has a finite non-zero value
(28)
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
Answer: The time constant and suppress the oscillations
(29)
The transient response, with feedback system,
[A]
rises slowly
[B]
rises quickly
[C]
decays slowly
[D]
decays quickly
(30)
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
31
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
Answer: increases by the sane saaaajajt as the gain decrease
32
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
Answer: The output for any given input
33
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
Answer: system is at rest and no energy is stored in any of its components
34
A control system with excessive noise, is likely to suffer from
[A]
saturation in amplifying stages
[B]
loss of gain
[C]
vibrations
[D]
oscillations
Answer: saturation in amplifying stages
35
Is an open loop control system.
[A]
Ward Leonard control
[B]
Field controlled D.C. motor
[C]
Stroboscope
[D]
Metadyne
Answer: Field controlled D.C. motor
36
The output of a feedback control system must be a function of
[A]
reference and output
[B]
reference and input
[C]
input and feedback signal
[D]
output and feedback signal
Answer: reference and output
37
Regenerative feedback implies feedback with
[A]
oscillations
[B]
step input
[C]
negative sign
[D]
positive sign
38
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
39
A.C. servomotor resembles
[A]
two phase induction motor
[B]
Three phase induction motor
[C]
direct current series motor
[D]
universal motor
Answer: two phase induction motor
40
Increases the steady state accuracy.
[A]
Integrator
[B]
Differentiator
[C]
Phase lead compensator
[D]
Phase lag compensator
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