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Control System MCQs – Top 10 Control System Engineering Questions

Control System MCQs – Top 10 Control System Engineering Questions

Electrical control systems play a fundamental role in our daily life. Control systems are very common around us and are well mixed in all aspects of our life. A system is defined as a combination of different physics components that are connected or interlinked to form an entire unit to achieve a certain objective. The term control means to regulate, direct or command a system in order to obtain the desired objective.

The signal that can have some negative or adverse effects is known as

The signal that can have some negative or adverse effects is known as:

  1. Input
  2. Output
  3. Disturbance
  4. Control

Correct answer: 3. Disturbance
Explanation: Disturbance is defined as any signal that can have some adverse effect on the output of the system. Disturbance can be classified into two classes. It can either be an internal disturbance or it can be an external disturbance. The internal disturbance is the disturbance produced within the system.

A Control system with unpredictable behavior is termed as

A Control system with unpredictable behavior is termed as:

  1. Deterministic
  2. Stochastic
  3. Any of these
  4. None of these

Correct answer: 2. Stochastic

Explanation:

Difference between Deterministic and Stochastic System

A deterministic system is defined as any system for which the response to input and to external disturbances is predictable and repetitive. On the other hand, a stochastic control system is defined as a system for which the response is unpredictable.

Which of the following is a disadvantage of open-loop control system

Which of the following is a disadvantage of open loop control system:

  1. Inaccuracy
  2. Unreliability
  3. Both of these
  4. None of these

Correct answer: 3. Both of these

Explanation:

Disadvantages of Open-loop control system:

  • Open-loop systems are inaccurate in nature
  • Open-loop systems are unreliable
  • The bandwidth of such a control system is less
  • The process of automation is not being facilitated
  • Impact of external disturbances can’t be corrected automatically

The control system that is also known as an automatic control system

The control system that is also known as automatic control system:

  1. Open loop control system
  2. Closed loop control system
  3. Any of these
  4. None of these

Correct answer: 2. Closed loop control system

Explanation: Open-loop control system is defined as any control system which doesn’t have any feedback connected to it.

A Closed-loop Control System is also known as a feedback control system. It is type of control system that has one or more feedback loops or paths between its output and its input. In a closed loop control system, the provision of feedback automatically corrects the changes in output due to disturbances. Therefore, the closed loop control system is also called as automatic control system.

In signal flow graph input node is defined as the node that has

In signal flow graph input node is defined as the node that has

  1. Incoming branches only
  2. Outgoing branches only
  3. Any of above
  4. None of the above

Correct answer: 2. Outgoing branches only

Explanation: Signal flow graph is a pictorial representation of system that graphically displays the transmission of signals.

Three branches in signal flow graph are:

Input Node or Source Node: The node that has only outgoing branches

Output Node or Sink Node: The node that has only incoming branches

Mixed Node or Chain Node: The node that has both incoming and outgoing branches

Cauer-2 form of LC network has X as series element and Y as shunt element respectively. Here X and Y indicates

Cauer-2 form of LC network has X as series element and Y as shunt element respectively. Here X and Y indicates:

  1. C and L
  2. L and C
  3. L and L
  4. C and C

Correct answer: 1. C and L

Automatic sun seeker solar system is an example of

Automatic sun seeker solar system is an example of:

  1. Open-loop control system
  2. Closed-loop control system
  3. Any of these
  4. None of these

Correct answer: 2. Closed-loop control system

Explanation: A control system whose actions are dependent on output or changes in output then such a system is known as a closed-loop control system. In the case of an automatic sun seeker control system, the action of the system depends on the feedback of output, and thus it is an example of closed-loop control system.

Value of step function for t<0 is

Value of step function for t<0 is

  1. Zero
  2. Maximum
  3. Infinite
  4. Any of above

Correct answer: 1. Zero
Explanation:
In case of step function value of the function is zero for t<0

The value of which of the following function increases linearly with time

The value of which of the following function increases linearly with time

  1. Step function
  2. Ramp function
  3. Unit impulse function
  4. None of these

Correct answer: 3. Ramp function

Ramp function:

The control system that can be represented using a partial differential equation is known as

The control system that can be represented using a partial differential equation is known as:

  1. Lumped parameter control system
  2. Distributed parameter control system
  3. Any of these
  4. None of these

Correct answer: 2. Distributed parameter control system

Explanation

Difference between Lumped and Distributed Paramters

So that was all about Top 10 Control System MCQs with brief explanation.

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