Fitting And Turning NCV Level 4 — Document
November 2019 — NCV Level 4 — Fitting And Turning
NCV Level 4
2019
NCV Engineering
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Q1— Section header —
1.1Various options are given as possible answers to the following questions. Choose the answer and write only the letter (A D\ next to the question number (1.1.1
1.1.6\n the ANSWER BOOK.
1.1.1the power from the motor directly to the impeller through its rotation. bearing housing impeller drive shaft
1.1.2Volute casing Mechanical seals Inlet and outlet flange
1.1.3release compressed air if the pressure inside the tank exceeds a safe limit. pressure gauge air receiver check valve
1.1.4impeller diffuser volute casing seal camber and stuffing box
1.1.5control switch regulator pressure gauge supply line
1.1.6the storage tank. air receiver outlet pipe compressor pump supply line
1.2Name FOUR safety precautions to be followed before you start using the pump for the first time after you have completed maintenance on the pump. (4\
1.3Name TWO types of rotary pumps that are used in the industry. (2\
1.4xplain why electrical equipment need to be isolated from other energy source (1\
1.5Explain the functions of the intercooler as used in piston compressors. (2\
1.6Air compressors have a number of functions in application. Name FIVE practical examples where compressed air can be used. (5\ [20]20
Q2— Section header —
2.1List FIVE general safety practices that should be followed when working with hydraulic systems and related equipment. (5\
2.2Explain the function of the different valves used in hydraulic systems.
2.2.3Directional control valves Safety valves Variable flow valve (3 2\ (6\
2.3List FIVE operational factors that influence the choice between hydraulic and pneumatic systems. (5\
2.4Differentiate between a normally closed and normally open valve
2.5Pneumatic pipe layouts have to be inspected for kinks and neatness. Give TWO reasons why pneumatic pipe systems must not have kinks in the pipes. (2\ [20] (6011044\20
Q3— Section header —
3.1List FOUR types of grinding wheels that can be used when working with a surface grinder. (4\
3.2Explain the purpose of doing the following operations on a grinding wheel:
3.2.1Dressing the wheel
3.2.2Balancing the wheel (2 1\ (2\
3.3List FOUR steps that have to be followed when dressing the grinding wheel on a surface grinding machine with a diamond dresser. (4\ [10]10
Q4— Section header —
4.1State THREE reasons why machine guards on lathe machines are designed in a specific way. (3\
4.2It is important to select the correct tools and equipment for quality checks when machining. Name any measuring tool that can be used to accurately check the outside diameter of the shaft. (1\
4.3Long work pieces often need support in the middle because cutting tools can push/ bend a work piece as a result of huge pressure that cutting the metal produces. List the names of TWO types of steadies that are used when working on the
4.4A work piece with a diameter of 200 mm is to be turned on a centre lathe. Calculate the spindle speed in revolutions per minute if the prescribe cutting speed for the material is given as 250 mm per second.
4.5List THREE pieces of information that need to be recorded a fter you have completed machining a work piece on a lathe (3\ [12] (6011044\12
Q5— Section header —
5.1As part of practical exercise you are required to cut two slots on a rectangular work piece. State FIVE factors that you have to take into consideration to calculate the depth of each cut. (5\
5.2Calculate the required indexing for a gear which should have 58 teeth machined on a gear blank by using a Brown & Sharpe dividing indexing plate BROWN & SHARPE INDEXING PLATES PLATE 1 15 16 17
5.3Name FOUR types of cutters that can be used on the milling machine. (4\ [12]12
Q6— Section header —
6.1Cleaning the work area after your shift is standard, but maintaining it throughout the day is not only better but safer too. List FOUR things to be considered when cleaning the workshop as indicated
6.2Cutting speed need to be identif ied as per the material specification. What will be the effect of the following when cutting a particular material.
6.2.1Cutting speed to high
6.2.2Cutting speed to low (2 1\ (2\
6.3A part programme is produced using geometrical data and technological data. List THREE stages that needs to be followed when program ing at an offline workstation. (3\
6.4List FIVE steps that need to be followed when you manually edit a CNC programme on the CNC controller (5\ (6011044\
6.5Calculate the depth of cut per tooth required for a 30 mm diameter HSS milling cutter, with four flutes when cutting mild steel at 720 rpm. Cutting speed for mild steel is 68 m/min Formula = MMP = (3\
6.6The following is a written programme for a milling machine to produce a rectangular block using a 20 mm thick mild steel plate. Study the programme and answer the questions. Programme No 00002 G80 G40 G91 G28 Z0G28 X0 Y0
50.0X0 Y0 G91 G28 Z0 M30 Program reset
6.6.1What are the dimensions of the rectangular block?
6.6.2Explain the meaning of S1200 in the programme.
6.6.3What is the meaning the of N code and T code used in CNC programming (3 2\
6.7Components are measured to check if the conform to the specific tolerance. Name THREE sections or phases that
Mark Allocation
Total100 marks
Sections20 + 20 + 10 + 12 + 12 + 26 = 100 marks
Paper information
TitleDocument
SubjectFitting And Turning
LevelNCV Level 4
Document typeQuestion paper
Year2019
MonthNovember
Pages7
Downloads4
Examination context
Decade2010s
Years ago7y
SeasonSpring (SH)
Start dayFriday
Exam periodNovember 2019
Days since exam2,536
About Fitting And Turning examination preparation
This TVET examination resource can be used as part of a structured revision programme. Past papers are most useful when learners attempt questions independently, work within a realistic time limit, and review their answers afterwards.
How to use this resource for revision
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For stronger examination practice, complete the paper without unnecessary interruptions and keep track of the questions that take the most time. Afterwards, review the memorandum and separate knowledge gaps from mistakes caused by interpretation, calculation, structure, or examination technique.
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A practical revision approach
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