Control System MCQs

Question 1

Which of the following system provi des provides excellent transient as well as steady state response?

Accepted Answer

proportional plus integral action

Answer

proportional action

Answer

proportional plus differential action

Answer

proportional plus integral actions plus differential action

Question 2

In an absolutely stable control system, oscillations

Accepted Answer

set up automatically get damped out eventually

Answer

can not set up at all

Answer

can be set up but may be controlled

Answer

are always present

Question 3

Main cause of absolute instability in a

Accepted Answer

error detector where the two signals are compared

Answer

parameters of controlling system

Answer

parameters of the controlled system

Answer

parameters of the feedback system

Question 4

The output of the controller in control system is fed to

Accepted Answer

final control element

Answer

amplifier

Answer

comparator

Answer

sensor

Question 5

The on-off controller is a

Accepted Answer

nonlinear device

Answer

linear device

Answer

discontinuous device

Answer

none of these

Question 6

The input to a controller is

Accepted Answer

an error signal

Answer

a servo signal

Answer

a sensed signal

Answer

none of these

Question 7

Error signal in a control system is

Accepted Answer

the difference between the measured value and the set value

Answer

the sum of the measured value and the set value

Answer

the ratio of the measured value to the set value

Answer

the ratio of the set value to the measured value

Question 8

Basically a controller is

Accepted Answer

a comparator

Answer

an amplifier

Answer

a clipper

Answer

a summer

Question 9

In a control system, when derivative action is included in a proportional controller, the proportional band

Accepted Answer

remains unaltered

Answer

decreases

Answer

increases

Answer

depends on derivative time constant