Question 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

Accepted Answer

In an open loop control system, the output is independent of the control input because there is no feedback to adjust the input based on the output.

Question 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

Accepted Answer

In an open control system, recalibration may be required to maintain the required quality of the output because it does not automatically correct for disturbances or changes in the environment, unlike a closed control system which adjusts itself based on feedback.

Question 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

Accepted Answer

A closed loop system is defined by its characteristic of having the control action dependent on the output. This means that the system uses feedback from the output to control its input, ensuring that the desired output is achieved.

Question 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

Accepted Answer

In a closed-loop control system, introducing positive feedback gain typically decreases the overall gain of the system. This is because the feedback signal, which is a portion of the output, is added to the input signal, effectively reducing the system's response to changes in the input.

Question 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

Accepted Answer

The answer of Which of the following is an open...

Question 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

Accepted Answer

Non-linearities can cause issues in open control systems, but their presence does not necessarily lead to malfunctioning.

Question 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

Accepted Answer

In an open loop system, the control action is independent of the output, meaning it does not adjust based on the output or feedback from the system.

Question 8

has tendency to oscillate.
A)Open loop system
B)Closed loop system
C)Both a) and b)
D)Neither a) nor b)

Accepted Answer

Closed loop systems have a tendency to oscillate due to feedback, which can cause the system to respond to its own output and potentially lead to oscillations if not properly controlled.

Question 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

Accepted Answer

A good control system is characterized by good stability, good accuracy, and sufficient power handling capacity. A slow response is generally not desirable as it indicates the system takes longer to reach its final state after a disturbance, which is not a feature of a good control system.

Question 10

A car is running 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

Accepted Answer

The needle of the speedometer provides feedback to the driver about the car's speed, allowing the driver to adjust accordingly.

Question 11

The initial response when the output is not equal to input is called
A)Transient response
B)Error response
C)Dynamic response
D)Either of the above

Accepted Answer

The answer of The initial response when the output is...

Question 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

Accepted Answer

A stochastic control system is one that operates under uncertainty due to random disturbances or actions, making choice C the correct answer.

Question 13

An automatic toaster is a ______ loop control system.
A)open
B)closed
C)partially closed
D)any of the above

Accepted Answer

The answer of An automatic toaster is a ______ loop...

Question 14

Any externally introduced signal affecting the controlled output is called a
A)feedback
B)stimulus
C)signal
D)gain control

Accepted Answer

A stimulus is any external signal or factor that can cause a response or change in an organism or any part of a system, including in the context of control systems.

Question 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

Accepted Answer

Feedback is the distinguishing feature of a closed loop system, as it uses the output to control the input for desired results, unlike an open loop system which operates without feedback.

Question 16

is a part of the human temperature control system.
A)Digestive system
B)Perspiration system
C)Ear
D)Leg movement

Accepted Answer

The perspiration system, part of the body's thermoregulation mechanism, helps control human temperature by releasing sweat through the skin to cool the body down.

Question 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

Accepted Answer

The answer of By which of the following the control...

Question 18

is a closed loop system.
A)Auto-pilot for an aircraft
B)Direct current generator
C)Car starter
D)Electric switch

Accepted Answer

Auto-pilot for an aircraft is a closed loop system because it continuously receives feedback from the aircraft's sensors and adjusts its controls accordingly to maintain the desired flight path.

Question 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

Accepted Answer

Vernistats, Microsyns, and Resolvers are all devices that can be used as error detectors in various instruments, each serving specific applications based on their unique properties and functionalities.

Question 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

Accepted Answer

The answer of Which of the following should be done...

Quiz 1: Control Systems and Feedback Loops: Understanding Open and Closed Loop Systems

In an open loop control system

For open control system which of the following statements is incorrect ?

A control system in which the control action is somehow dependent on the output is known as

In closed loop control system, with positive value of feedback gain the overall gain of the system will

Which of the following is an open loop control system ?

Which of the following statements is not necessarily correct for open control system ?

In open loop system

has tendency to oscillate.

A good control system has all the following features except

A car is running at a constant speed of 50 km/h, which of the following is the feedback element for the driver ?

The initial response when the output is not equal to input is called

A control system working under unknown random actions is called

An automatic toaster is a ______ loop control system.

Any externally introduced signal affecting the controlled output is called a

A closed loop system is distinguished from open loop system by which of the following ?

is a part of the human temperature control system.

By which of the following the control action is determined when a man walks along a path ?

is a closed loop system.

Which of the following devices are commonly used as error detectors in instruments ?

Which of the following should be done to make an unstable system stable ?