Industrial Instruments N6 — Document
April 2021 — N6 — Industrial Instruments
N6
2021
Nated Engineering
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Q1— Section header —
1.5\ in the ANSWER BOOK.
1.1Integral action is also known as (rate/reset\.
1.2After (proportional/integral\ action was applied, the process may oscillate and finally stabilise out at a point of equilibrium which may not be the desired value.
1.3(Class/Division\ designates the degree of hazardous material in a location.
1.4A (calori oule\ is the quantity of heat required to raise the temperature of one kilogram of water with one degree centigrade.
1.5oiler/ ondenser\ is a heat transfer device that reduces a thermodynamic fluid from its vapour phase to its liquid phase.
Q2— Section header —
2.5\ in the ANSWER BOOK. qual percentage characteristic; uick opening characteristic;
2.1mall percentage val e opening resulting in a large amount of flow
2.2De vice used to vary the flow of the control agent in respon se to a signal received from the controller
2.3All fuel shut off upon loss of airflow to the furnace
2.4ontrol loop consist ing of two controllers where the set point to the control loop is fed into the primary controller while the output of the primary controller becomes the set point to the secondary controller
2.55
Q3— Section header —
3.1Screwed connections are suitable for large size valves and flanges for small size
3.2When the ray diffraction method is used to determine crystalline materials, the lines are broad and indistinct
3.3If the pressure within the throat falls below the vapour pressure of the liquid, vapour bubbles will form, causing flashing
3.4Sealing and immersion occur when the equipment is immerse d in a liquid or solid material usually sand or inert oil
3.5Air to open means that an increase in air pressure on the diaphragm causes the valve to close, which
3.6A s plit range occurs when two or more control loops are connected to a common valve in such a way that under normal conditions, the normal control loop is in command of the valve
Q4— Section header —
4.1Explain, with the aid of a sketch, the principle of operation of Cutler Hammer recording gas calorimeter
4.2
4.3Sketch a multisource excitation unit as used in an optical emission spectrochemical analyser (5\ [23]23
Q5— Section header —
5.1Make a neat, labelled sketch of the component s in a feedback control loo p. (5\
5.2Define each of the following terms:
5.2.1Measurement lag
5.2.2Process lag
5.2.3
5.3The instrument gas supply on a particular plant was reduced from 10 85 ar to 2
5.4Choose a te rm from COLUMN B that matches a description in COLUMN A. Write only the letter (A E\ next to the question number (5.4.1
5.4.5\ in the ANSWER BOOK. COLUMN A COLUMN B
5.4.5When two or more control loops are connected to a common control valve in such a way that under normal conditions, the normal control loop is in command of the valve atio of the maximum to the minimum
Q6— Section header —
6.1Complete the following paragraphs by writing only the missing word or words next to the question number (6.1.1
6.1.7
6.2Explain why fuel and air in boilers should be controlled in parallel rather than series. (3\
6.3.1Wh ich type of feedwater control system is shown in the sketch (1\
6.3.2Explain the working principle of the system shown in the sketch. (5\
6.4Differentiate between measurable fuel and unme asurable fuel and give ONE example of each
Q7— Section header —
7.1State SIX conditions that must be met sim ultaneously to create an explosion hazard (6\
7.2Which SIX steps of analysis are essential when designing for intrinsic safety (6\ [12] TOTAL SECTION B: 80 GRAND TOTAL: 10012
Topics Identified
1
Business Plan
Mark Allocation
Total100 marks
Sections5 + 5 + 23 + 25 + 20 + 12 = 90 marks
Paper information
TitleDocument
SubjectIndustrial Instruments
LevelN6
Document typeQuestion paper
Year2021
MonthApril
Pages7
Downloads5
Examination context
Decade2020s
Years ago5y
SeasonAutumn (SH)
Start dayThursday
Exam periodApril 2021
Days since exam2,019
About Industrial Instruments examination preparation
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