Fitting And Machining Theory N2 — Document

April 2020 — N2 — Fitting And Machining Theory

N2 2020 Nated Engineering

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🎯 100 marks ⏱️ 3h 📄 9 pages 📝 75 items found

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Q1— Section header —

1.1State FIVE characteristics of an effective machine guard.

1.2State FIVE precautions that must be adhered to in preventing underground fires. [5]5

Q2— Section header —

2.6\ in the ANSWER BOOK. COLUMN A COLUMN B

2.6The force responsible for transmitting drive from one rotor to an other in a fluid coupling n elastic torsion coupling that i s suitable for most applications A coupling that insulates the moto

Q3— Section header —

3.1eviation on holes and shafts are indicated by capital and small alphabetical letters. What do the following letters indicate?

3.1.2

3.2Name THREE basic classes of fits. (3\

3.3State TWO factors that influence interference fits. (2\ [7]7

Q4— Section header —

Q5— Section header —

5.1Explain what is meant by the following lubrication terms:

5.1.1Rubbing pressure

5.1Cold point (1\

5.1.3Adhesion (1\

5.2FIGURE 1 shows a diagram of a valve. FIGURE 1

5.2.1Name the valve in FIGURE 1. (1\

5.2.2Explain the working principle of this valve. (2\ [6]6

Q6— Section header —

6.1State FIVE characteristics of the rubber that is used as packing and seals. (5\

6.2State where each of the following fittings may be used in a water pipe system:

6.2.1Plug

6.2.2Cap

6.2.3Nipple

6.2.4Socket (4 (4\ [9]9

Q7— Section header —

7.1Name TWO types of rotary pumps (2\ What type of pumps are piston and plunger pumps (1\ Name THREE components of a centrifugal pump [6]6

Q8— Section header —

8.1Name the components label ed A and B. (2\

8.2State the operation of this compressor during the compression stroke. (2\ [4]4

Q9— Section header —

9.1State FOUR advantages of belt drives compared to chain drives (4\

9.2Explain why a gear drive is referred to as a positive drive. (1\

9.3State the influence that an idler gear has on the velocity ratio of a gear train. (1\

9.4State the FOUR factors to be taken into consideration when determining chain length. (4\

9.5Explain TWO function of a reduction gearbox. (2\ [12] TOTAL SECTION A: SECTION B Answer any TWO of the three questions in12

Q10— Section header —

10.1Name FIVE basic components in a pneumatic system (5\

10.2State the THREE main functions of oil in a hydraulic system

10.3Name the TWO most important factors in the functioning of a pneumatic system (2\ Explain the functions of the following components of a hydraulic system Reservoir Pressure relief valve Control valve Actuator

10.5Make neat, freehand sketches of the ISO symbols representing the following hydraulic or pneumatic components:

10.5.1Hydraulic pump

10.5.2Reservoir

10.5.3Compressor

10.5.4Electric motor

10.5.5Non return valve (5 x 1\ (5\ [20]20

Q11— Section header —

11.1Name TWO types of steadies that are used on a centre lathe. (2\

11.2State the type of mandrel that may be used to machine each of the following:

11.2.1The outside diameter of bushes

11.2.2A workpiece that has a tapered hole

11.2.3

11.3State TWO advantages of using the graduated sleeve method when performing taper turning on a centre lathe. (2\

11.4A carbon steel pin rotating at 2 100 r/min is receiving a finishing cut on a centre lathe. Calculate the diameter of the carbon steel pin if the cutting speed is 95 m/min. (3\

11.5

11.5.1Helix angle of the thread (4\

11.5.2Leading angle of the cutting tool (2\

11.5.3Following angle of th e cutting tool (2\

11.6Name the type of CNC programming that entails each of the following process

11.6.1Uses the zero point as a point of reference from which all other points are taken during the machining cycle

11.6.220

Q12— Section header —

12.1What is the function of index pin on a milling machine? (1\

12.2FIGURE 4 shows three milling cutters. FIGURE 4

12.2.1Name the milling cutters shown in FIGURE 4 by writing only the answer next to the letter (A the ANSWER BOOK (3\

12.2.2State the functions of milling cutters A, B and C shown in FIGURE 4. (3\

12.3milling machine ha s to mill 18 teeth on a gear blank. Calculate the required indexing using a Cincinnati dividing head. THE CINCINNATI DIVIDING HEAD Side 1 Side 2 (3\

12.4Calculate the feed in mm/min of a 75 mm diameter cutter with 14 teeth and a feed of 0 08 per tooth. The cutting speed of the material is 25 m/min. (5\

12.5State TWO functions of the dividing head (2\

12.620

Mark Allocation

Total100 marks

Sections5 + 6 + 7 + 5 + 6 + 9 + 6 + 4 + 12 + 20 + 20 + 20 = 120 marks

Paper information

TitleDocument

SubjectFitting And Machining Theory

LevelN2

Document typeQuestion paper

Year2020

MonthApril

Pages9

Downloads2

Examination context

Decade2020s

Years ago6y

SeasonAutumn (SH)

Start dayWednesday

Exam periodApril 2020

Days since exam2,383

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