1. What is Control System?
a) Control system is a system in which the output is controlled by varying the input
b) Control system is a device that will not manage or regulate the behaviour of other devices using control loops
c) Control system is a feedback system that can be both positive and negative
d) Control System is a system in which the input is controlled by varying the output
Answer: a
Explanation: Control System is a system in which the output is controlled by varying the input. A Control system is a device that will manage, command, direct or regulate the behaviour of other devices using control loops.
2. Which of the following is not the feature of a modern control system?
a) Correct power level
b) No oscillation
c) Quick response
d) Accuracy
Answer: b
Explanation: For a good control system the speed of response and stability must be high and for the slow and sluggish response is not used and undesirable.
3. What is the characteristic of a good control system?
a) Insensitive to the parameter variation but sensitive to the input commands
b) Neither sensitive to parameter variations nor sensitive to input commands
c) Insensitive to the input command
d) Sensitive to parameter variation
Answer: a
Explanation: In a good control system, the output is sensitive to input variations but insensitive to parameter variations.
4. Which of the following element is not used in an automatic control system?
a) Final control element
b) Sensor
c) Oscillator
d) Error detector
Answer: c
Explanation: In an automatic control system oscillator is not used because the oscillator increases the oscillations but our aim is to reduce the oscillations and hence oscillator is not used.
5. A control system working under unknown random actions is called ____________
a) Adaptive control system
b) Stochastic control system
c) Computer control system
d) Digital data system
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Answer: b
Explanation: A control system is a system which is having feedback and can be both positive and negative and working under unknown random actions is called stochastic control system.
6. Which of the following is an open loop control system?
a) Ward Leonard control
b) Metadyne
c) Stroboscope
d) Field controlled D.C. motor
Answer: d
Explanation: Open loop control systems are the systems that have no feedback and cannot be used to obtain the desired response and field controlled system is an open loop control system.
7. Which of the following statements is correct for any closed loop system?
a) Only one of the static error co-efficient has a finite non-zero value
b) All the co-efficient can have zero value
c) All the co-efficient are always non-zero
d) All of the mentioned
Answer: a
Explanation: Closed loop systems are the systems with positive and negative feedback and for standard test signals error constants are defined and for one of the inputs one of the static error coefficient has a finite non-zero value.
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8. What should be the nature of bandwidth for a good control system?
a) Small
b) Medium
c) Large
d) All of the mentioned
Answer: c
Explanation: Bandwidth is defined as the difference in the highest frequency and lowest frequency and bandwidth must be large for the good control system and for higher bandwidth noise is also large.
9. The output of the feedback control system must be a function of
a) Output and feedback signal
b) Input and feedback signal
c) Reference input
d) Reference output
Answer: b
Explanation: Feedback control system has the property of reducing the error and that is by differencing the output with the desired output and as the equation of the output of the system is C=GR/1+GH.