Industrial Instruments N4 — Document

April 2020 — N4 — Industrial Instruments

N4 2020 Nated Engineering

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🎯 100 marks ⏱️ 3h 📄 9 pages 📝 32 items found 🔑 1 key info

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Q1— Section header —

1.10\ in the ANSWER BOOK.

1.1

1.2athematical ex pression or formula for stress *+----,+ ! %-4;BHMQTVXZ[[\\[[ZWUSOKF?81 *+,,,+*

1.7ontrol process requiring direct human intervention Open loop control Closed loop control Cascade control Fuzzy control

1.8elay valve increasing output when nozzle back pressure decreases: Direct acting continuous bleed relay valve Reverse acting continuous bleed relay valve Non bleed relay valve

1.9

1.1010

Q2— Section header —

2.5\ in the ANSWER BOOK.

2.1

2.2A capacitive level sensor measure the level in a tan k where the liquid serves dielectric

2.3In an ultrasonic level sensor, the time travelled by the transmitted pulse back to the receiver is an indication of the level in a tank

2.4The relationship between the pipe diameter and the diameter of a hole in the orifice plate cannot influence the calibration of this gauge

2.55

Q3— Section header —

3.5Algebraic difference between the highest and the lowest calibration point of an instrument bility of some crys tals to generate an emf proportional to the pressure variation

4.3Explain the relationship between inductance reluctance

4.4Transducers are used to change mechanical signals to electrical signals

4.4Make a neat labelled sketch of a piezo electric pressure transducer

4.4Explain how this transducer convert mechanical signal to an electrical signal

4.4.3Name THREE disadvantages of this type of a transducer [20]20

Q5— Section header —

Q6— Section header —

6.1Draw simple electr onic circuit diagrams showing each of the actions below in operatio nal amplifier. Clearly indicate the output for each of the control actions if a step input is used

6.1.1Integral control action

6.1.2Derivative control action

6.2Sketch the characteristic curves (% flow against valve opening\ of a butterfly valve (2\

6.3Make a labelled sketch of a resonant impedance bridge telemetering system (7\

6.4State the functions of the feedback element of a pneumatic telemetering system (3\ [20]20

Q7— Section header —

Multiple Choice Options

C)The

Mark Allocation

Total100 marks

Sections10 + 5 + 20 + 20 + 20 = 75 marks

Key Information

Contact Number0367899976 · 0245677654

Paper information

TitleDocument

SubjectIndustrial Instruments

LevelN4

Document typeQuestion paper

Year2020

MonthApril

Pages9

Downloads3

Examination context

Decade2020s

Years ago6y

SeasonAutumn (SH)

Start dayWednesday

Exam periodApril 2020

Days since exam2,386

About Industrial Instruments examination preparation

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How to use this resource for revision

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A practical revision approach

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File size484.7 KB

Pages9

Archived on8 September 2026

File age48d

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