Control System Quiz | Control System Objective Type Questions and Answers

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Questions
21 A controller, essentially, is a
A sensor
B clipper
C comparator
D amplifier

Answer: comparator
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
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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

Answer: 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

Answer: 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

Answer: 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

Answer: 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

Answer: Band width
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

Answer: Integrator

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