MCQs on Control Systems


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01․ In the cauer-2 form of LC network---------is series element and --------is shunt element respectively?
L and C
C and L
L and L
C and C

In the cauer-2 form of single port LC filter network anlysis C is series element and L is shunt element respectively.

02․ Lowest critical frequency is due to pole and it may be present at the origin or nearer to the origin, then the type of network is
LC.
RL.
RC.
Any of the above.

In RC network lowest critical frequency is due to pole and it is at origin or nearer to origin depending on the value of the capacitance value and transfer function.

03․ Lowest critical frequency is due to zero and it may be present at the origin or nearer to the origin, then the type of network is
LC network.
RC network.
RLC network.
RL network.

In RL network lowest critical frequency is due to zero and it is present at origin or nearer to origin as the transfer function has s at the numerator.

04․ Poles and zeros are arranged alternatively on negative real axis, then type of network is/are
LC network.
RC network.
RL network.
Both 2 and 3.

In both RC and RL networks poles and zeros are arranged alternatively on negative real axis and in LC network poles and zeros are arranged alternatively on imaginary axis. Zeros occur due to presence of inductance and poles occur due to presence of capacitance respectively.

05․ A box which tells the effect of inputs on control sub system is known as
Data Box.
Logical box.
Decision box.
State box.

In a flow chart diagram decision box represents the effects of control sub system. From here the chart will continue to flow to the satisfied condition direction.

06․ Which system is also known as automatic control system?
Open loop control system
Closed loop control system
Either 1 or 2
Nether 1 nor 2

Control system in which the output has an effect upon the input quantity in order to maintain the desired output value is called closed loop control system. The open loop system can be modified as closed loop system by providing a feedback. The provision of feedback automatically corrects the changes in output due to disturbances. Hence the closed loop control system is also called as automatic control system.

07․ Advantages of open loop system is/are
simple and economical.
accurate.
reliable.
all of the above.

Advantages of open loop systems:
  1. The open loop systems are simple and economical
  2. The open loop systems are easier to construct
  3. Generally the open loop systems are stable
Disadvantages of open loop systems:
  1. Open loop systems are inaccurate and unreliable
  2. The changes in the output due to external disturbances are not corrected automatically

08․ Which of the following are the disadvantages of a closed loop control system?
Reduces the overall gain.
Complex and costly.
Oscillatory response.
All of the above.

Advantages of closed loop control systems:
  1. The closed loop systems are accurate.
  2. The closed loop systems are accurate even in the presence of non linearities.
  3. The sensitivity of the system may be made small to make the system more stable.
  4. The closed loop systems are less affected by noise.
Disadvantages of closed loop control systems:
  1. The closed loop systems are complex and costly
  2. The feedback in closed loop systems may lead to oscillatory response
  3. The feedback reduces the overall gain of the system
  4. Stability is the major problem in closed loop systems and more care is needed to design stable closed loop systems.

09․ The output of the system has an effect upon the input quantity, then the system is a
open loop control system.
closed loop control system.
either 1 or 2.
none of the above.

Control system in which the output has an effect upon the input quantity in order to maintain the desired output value is called closed loop control system. The open loop system can be modified as closed loop system by providing a feedback. The provision of feedback automatically corrects the changes in output due to disturbances. Hence the closed loop control system is also called as automatic control system.

10․ By using which of the following elements, mechanical translational systems are obtained?
mass element
spring element
dash-pot
all of the above

The model of mechanical translational systems can be obtained by using three basic elements mass, spring and dash-pot. These three elements represents three essential phenomena which occur in various ways in mechanical systems.

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