Fitting And Machining Theory N2 — Document
April 2021 — N2 — Fitting And Machining Theory
N2
2021
Nated Engineering
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Q1— Section header —
Q1— Section header —
Q1— Section header —
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1.1Indicate whether the following statements are TRUE or FALSE by writing only 'True' or 'False' next to the question number (1.1.1
1.1.5\in the ANSWER BOOK.
1.1.1No person shall fit a grinding wheel unless the manufacturer's rated minimum speed in revolutions per minute is clearly marked on the wheel.
1.1.2A strong person may climb a ladder using one hand.
1.1.3Grinding wheels are to be mo unted concentrically onto the spindle.
1.1.4Compressed gas cylinders must be stored in a well ventilated area away from heat and direct sunlight.
1.1.55
1.2Indicate whether the following statements are TRUE or FALSE by writing only 'True' or 'False' next to the question number (1.2.1
1.2.5\in the ANSWER BOOK.
1.2.1No person shall smoke in the workings of a fiery mine.
1.2.2A valid a vehicle on a mine.
1.2.3All machinery, when in motion, must be securely fenced off to prevent a danger to any persons.
1.2.4A weight can be placed on a safety valve to keep the pr essure in the boiler constant.
1.2.55
Q2— Section header —
2.1FIGURE 1
2.1.1Name the coupling shown in FIGURE 1.
2.1.2To which group does this coupling belong?
2.1.3
2.2State the group into which each of the following couplings fall:
2.2.1Chain coupling
2.2.2Spider coupling
2.2.36
Q3— Section header —
3.1Describe the following fits with reference to how the mating parts fit relative to each other:
3.1.1Push fit
3.1.2Running fit
3.1.3Sliding fit
3.1.4
3.2Define the following terms:
3.2.1Bilateral tolerance
3.2.2Unilateral tolerance
3.2.37
Q4— Section header —
4.1State THREE causes of noisy roller bearings. (3\
4.2Name TWO disadvantages of anti frictional bearings. (2\ [5]5
Q5— Section header —
5.1Explain what is meant by the following lubrication terms:
5.1.1Rubbing speed
5.1.2Adhesion
5.1.3
5.2Explain the working principle of a valve. (3\ [6]6
Q6— Section header —
6.1State FIVE reasons for lagging water and steam pipe lines. (5\
6.2List FOUR joining methods for steel water pipes. (4\ [9] (11022032\ Copyright reserved Please turn over9
Q7— Section header —
7.1FIGURE 2 shows diagrams of two pumps. Study the diagrams and answer the questions. FIGURE 2
7.1.1Name the pumps labelled A and B in FIGURE 2. (2\
7.1.2State the category under which these pumps are classified. (1\
7.1.3State the type of displacement that occurs in these pumps. (1\
7.2State TWO reasons why the impeller of a centrifugal pump is designed with backward curved vanes. (2\ [6]6
Q8— Section header —
8.1Air filter
8.2High pressure cylinder
8.3Drain valve
8.44
Q9— Section header —
9.1State the main function of a V belt. (1\
9.2Explain the meaning of the following V belt drive terms:
9.2.1Arc of contact
9.2.2
9.3State THREE disadvantages of gear drives compared to belt drives. (3\
9.4Name ONE instance where the use of chain drives is preferred over:
9.4.1Gear drives
9.4.2
9.5List TWO disadvantages of chain drives (2\
9.6State TWO ways to ensure that bearings on gearboxes are maintained in good working order. (2\ [12] TOTAL SECTION A: 60 (11022032\12
Q10— Section header —
10.1Choose an item from COLUMN B that matches a description in COLUMN A. Write only the letter (A E\ next to the question number (10.1.1
10.1.5\in the ANSWER BOOK. COLUMN A COLUMN B
10.1.5The force per unit area Allows fluid flow in one direction only The quantity of compressed air circulating through a given cross section in unit time
10.2Identify the following ISO pneumatic symbols
10.2.5
10.3Tabulate THREE differences between a hydraulic system and a pneumatic system. Copy and complete the following table in the ANSWER BOOK. HYDRAULIC SYSTEM PNEUMATIC SYSTEM (6\
10.4Name the type of displacement pump used in hydraulics. (1\
10.5State the THREE main functions of oil in a hydraulic system (3\ [20]20
Q11— Section header —
11.1Name FOUR types of lathe mandrels. (4\
11.2State TWO disadvantages of using the graduated sleeve method when doing taper turning on a centre lathe. (2\
11.3A shaft with a diameter of 85 mm is machined on a lathe with a cutting speed of 45 m/min. It takes 5 minutes to execute one longitudinal cut along the shaft. The feed of the cutting tool is 0.8 mm per revolution.
11.4FIGURE 4 shows a tapered shaft which is to be turned to the dimensions given. FIGURE 4
11.4.1Calculate the amount of tailstock set over. (2\
11.4.2Calculate the included angle of the tapered portion in degrees and minutes. (3\
11.5List FIVE factors to consider when writing a CNC programme. (5\ [20] (11022032\ 10 Copyright reserved20
Q12— Section header —
12.1Explain the functions of the following milling cutters:
12.1.1Dovetail cutter
12.1.2Slotting cutter
12.1.3End mill cutter
12.1.4
12.2List THREE reasons for using a nicked helical cutter. (3\
12.3
12.4Calculate the spindle speed of a milling machine using a 90 mm diameter cutter at a cutting speed of 23 m/min. (3\
12.5Give the mean ing of the following grinding wheel terms:
12.5.1Grit size
12.5.2Grade
12.5.3
12.6State TWO ways in which loading of grinding wheels can be prevented. (2\ [20] TOTAL SECTION B: 40 GRAND TOTAL: 100 (11022032\20
Mark Allocation
Total100 marks
Sections5 + 5 + 6 + 7 + 5 + 6 + 9 + 6 + 4 + 12 + 20 + 20 + 20 = 125 marks
Paper information
TitleDocument
SubjectFitting And Machining Theory
LevelN2
Document typeQuestion paper
Year2021
MonthApril
Pages11
Downloads4
Examination context
Decade2020s
Years ago5y
SeasonAutumn (SH)
Start dayThursday
Exam periodApril 2021
Days since exam2,020
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