MEC522/MEM686 CONTROL SYSTEM QUIZ 1

Control of an industrial process by automatic rather than manual means is often called .................. [CO1/PO1]

• a design gap

• negative feedback

• automation

• a specification

An open-loop control system utilizes an actuating device to control a process ___________ [CO1/PO1]

• in engineering synthesis

• using feedback

• without using feedback

• in engineering design

Closed-loop control systems should have which of the following properties: [CO1/PO1]

• Low sensitivity to changes in the plant parameters

• Good regulation against disturbances

• Desirable responses to commands

• All of the above

The function of the proportional mode is to ____________? [CO1/PO1]

• Provide gain

• Eliminate offsets

• To speed up the response and minimize the overshoot

• All of the above

Answer explanation

The proportional mode is used for small set points and small load changes

The PID controller is very effective for _____________ processes. [CO1/PO1]

• Slower

• Faster

• Poor

• None of the above

Which one of the following controllers improves steady state error and also stability of the system? [CO1/PO1]

• P controller

• PI controller

• Both a and b

• None of the above

Answer explanation

The PI controller reduces the steady state error

What is the disadvantage of proportional integral controller? [CO1/PO1]

• Reduces steady state error

• Increases the order of system

• System will be less stable

• None of the above

Answer explanation

The advantages of proportional integral controller is it reduces steady state error and increases the order of the system

A closed loop system is distinguished from open loop system by which of the following? [CO1/PO1]

• Servo mechanism

• Signal

• Feedback

• Output

___ is an open loop control system. [CO1/PO1]

• Ward Leonard control

• Stroboscope

• Field controlled D.C. motor

• Metadyne

In an automatic control system which of the following elements is not used? [CO1/PO1]

• Error detector

• Sensor

• Final control element

• Oscillator