Process Control NCV Level 4 — Document

November 2022 — NCV Level 4 — Process Control

NCV Level 4 2022 NCV Engineering

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Q1— Section header —

1.5\in the ANSWER BOOK.

1.1Steps taken when problems in quality control are identified and rectified Adjustment Deviation

1.2It is not an example of process variable Data

1.3The s

1.4It can perform advanced control functions DCS CO RTU

1.5operates within the control limits. operates far away from the limits. operates within control limits but is going out of control.

Q2— Section header —

2.5\n the ANSWER BOOK. COLUMN COLUMN

2.5A system that is used to automate a process in a plant It allows the operator to formulate and implement a human decision in an automatic process Process where data is stored in a computer Process control operations

Q3— Section header —

3.5\n the ANSWER BOOK.

3.1Control charts can be used to see whether the process is in control, or out of control and unstable.

3.2Cyclic conditions happen repeatedly.

3.3Automated shut down procedures are not important in the plant.

3.4The control valve changes the temperature in the correct direction to maintain a constant ratio.

3.5

Q4— Section header —

4.1The following terms are used in process control. Define each term

4.1.1Deviation

4.1.2Specification

4.1.3

4.2Draw a control chart indicating the following:

4.2.1Cycle

4.2.2

4.3Describe the corrective action/preventative action (CAPA\ process that is used in the industry for detecting and eliminating problems. (5\

4.4pH is defined as the logarithm of the hydronium ion concentration

4.4.1What is the range of a pH scale? (2\

4.4.2Name the instrument that measures pH. (2\

4.4.3Name TWO types of electrodes found within the pH sensor. (2\

4.4.4Calculate the pH of 0,09 M sulphuric acid. (4\ [25]25

Q5— Section header —

5.1Define the term information flow (2\

5.2Describe the comm n function of SCADA and DCS. (2\

5.3Explain the meaning of the following statements:

5.3.1DCS is process oriented

5.3.2

5.4List NINE components of DCS. (9\

5.5Explain the FIVE purposes of DCS screen. (5\

5.6Provide the names of the following pictorials:

5.6.3

5.7Draw the following ISO PFD symbols

5.7.1Boiler

5.7.2Cooling tower

5.7.334

Q6— Section header —

6.1State SIX reasons for shutting down a plant. (6\

6.2Name THREE types of automatic control systems. (3\

6.3Explain TWO functions of automatic control systems. (2\

6.4One of the ways of achieving ratio control is by using ratio control with a constant multiplier Draw a flow diagram to illustrate a ratio control with a constant multiplier (10\ [21]21

Mark Allocation

Total100 marks

Sections10 + 5 + 25 + 34 + 21 = 95 marks

Paper information

TitleDocument

SubjectProcess Control

LevelNCV Level 4

Document typeQuestion paper

Year2022

MonthNovember

Pages7

Downloads5

Examination context

Decade2020s

Years ago4y

SeasonSpring (SH)

Start dayTuesday

Exam periodNovember 2022

Days since exam1,441

About Process Control examination preparation

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