Process Control Suplementary NCV Level 3 — Document

March 2018 — NCV Level 3 — Process Control Suplementary

NCV Level 3 2018 NCV Engineering

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🎯 1 marks ⏱️ 3h 📄 5 pages 📝 49 items found 📚 1 topics

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Q1— Section header —

1.10\in the ANSWER BOOK.

1.1Pneumatic actuators need no air supply for operation.

1.2Control, in terms of process instrumentation, involves comparing a known value to the measured value.

1.3A r emote instrument can take measurement without being in close proximity to the material or product being measured.

1.4Normal control limit is the top line on the control chart.

1.5Bourdon tubes are ci rcular tubes with an oval cross section used to measure temperature.

1.6Electrical measuring instruments are mostly used for measuring basic parameters such as current, voltage, resistance and speed of rotation.

1.7A t hermometer that relies on th e expansion of a liquid in metal has inaccuracies due to the expansion of the container.

1.8A trip is a safety device that lowers the risk of unwanted events happening by cutting off power to the device that causes potential damage.

1.9An open lo op control system does not need uman operator to take corrective measures.

1.1010

Q2— Section header —

2.5\ the ANSWER BOOK.

2.1When a measured variable moves away from a desired value

2.2One common controller signal commands two or more contr ol valves.

2.3A safety device that stops machines, when tripping and thus preventing damage to the mac hine and injury to the operator

2.4A control loop where a correction is made in the controller a fter an error has been detected

2.510

Q3— Section header —

3.1The dipstick is one of the simplest level measuring gauges. Explain how a dipstick can be used to measure the level of oil in a car engine. (4\

3.2Nam FOUR types of expansion thermometer (4\

3.3Make a simple labelled sketch of the operation of a solid rod thermometer.

3.4Discuss the working principle of a bimetallic strip thermometer. (10\ [23]23

Q4— Section header —

4.1Draw a block diagram of a feed forward control system. (5\

4.2An alarm is used to alert personnel of variable changes from normal operation.

4.2.1What is alarm management (2\

4.2.2Name THREE things that can cause a nascence alarm to be seen or heard in a process plant. (3\

4.2.3Name TWO primary events that may lead to alarm floods. (2\

4.2.4Define a trip (2\ (6050403\ NC2480

4.3Explain the following alarm elements:

4.3.1Warning lights

4.3

4.4Name FOUR types of safety sensors. (4\ [22]22

Q5— Section header —

5.1Piping and connections are represented by several different symbols. Draw representation symbols for the following:

5.1.1Main process

5.1.2Minor process

5.1.3Electrical line

5.1.4Pneumatic signal

5.1.5Software line/data link

5.1.6

5.2Name T HREE types of differential flow meters. (3\

5.3Which type of area flowmeter is also known as variable area flow meter? (2\

5.4Name FOUR types of open channel meters. (4\ [21]21

Q6— Section header —

6.1Explain the difference between local display and remote display (4\

6.2Make a sketch of a pitot tube flow meter and explain its working prin ciple. (10\ [14] TOTAL: 10014

Topics Identified

Leadership

Mark Allocation

Total100 marks

Sections10 + 10 + 23 + 22 + 21 + 14 = 100 marks

Paper information

TitleDocument

SubjectProcess Control Suplementary

LevelNCV Level 3

Document typeQuestion paper

Year2018

MonthMarch

Pages5

Downloads4

Examination context

Decade2010s

Years ago8y

SeasonAutumn (SH)

Start dayThursday

Exam periodMarch 2018

Days since exam3,147

About Process Control Suplementary examination preparation

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A practical revision approach

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