Marking Scheme 3764 K2 Trial 2008

MARKING SCHEME PEPERIKSAAN PERCUBAAN SIJIL PELAJARAN MALAYSIA 2008 ENGINEERING TECHNOLOGY PAPER 2 Question Number 1

Descriptions a)

Marks

i) •1 Do the straight turning process by using the lathe machine to produce round part with length 15 mm at one end of Part A. •2 Clamp this part to the vice vertically. •3 File edges on the workpiece.and mark the thread length. •4 Choose a suitable die and fit it to the wrench. •5 Fit the die to the workpiece. •6 Apply pressure evenly when turning the wrench clockwise and anti-clockwise in cutting the screw thread. Use cutting fluid during threading. •7 Repeat step 6 until the thread length is reach. •8 Test the thread with the appropriate nuts.

Marking

Steps = 8 X 1m 2 sketches (max) = 2 X 1m

8m 2m

(ii) •1 •2 •3 •4 •5 Marking

Place both part on a suitable place. Ignite the gas at the tip of the torch and set the suitable flame. Heat the base metal until it melts and then place the filler rod to the joint part. Move the filler rod and torch along the joint length. Wait until it cools down and clean the surface. 5 steps = 5 X 1m 1 sketch = 1 x 1m

5m 1m

(b) i) ii) iii) iv) v) Marking

Wear safety shield Wear leather glove Wear proper attire/leather apron Wear safety shoe/ rubber shoe Make sure welding equipment are in good condition any 4 answers = 4 X 1m 4m

Total 20m

2

a)

i)

Stretcher Bond

2m

ii) •1 •1 •1 •1 •1 •1 •1

Marking

Horn/joggle – anchored into the brick wall to strengthen the door frame. Steel cramp - prevent door detaches from the brick wall. Dowels - Strengthen lower part of the jamb. Pad stone – prevent the jamb from rotten due to water. Temporary struts – remains door frame perpendicular. Temporary support – ensure door frame fixed vertically. Reinforced concrete lintel – Built at top of the head as to transfer imposed load from the wall to the side wall.

Seven steps answer = 6 X 1m Sketches + label = 2m + 2m

6m 4m

iii) Spirit level, steel square, trowel, brick hammer, Wood Saw, Claw hammer Marking iv)

any two answers = 2 X 1m

2m

Timber flush door, 4-panel door, 6-panel door, battened door, Solid timber door.

Marking

any one answer = 1 X 2m

2m

b) •2 Frame must be perpendicular •3 Frame must be vertical and same level •4 Strengthening frame position Marking

any two answer = 2 X 2m

4m Total

3

20m

a)

Mark

Data fill in Rise and fall calculation Reduced level calculation Arithmetic check calculation Error calculation

Marking

= = = = =

4 X 1m 3 X 1m 3 X 1m 2 X 1m 1 X 1m

Maximum marks -= 12m

12m

b)

Marking

Reduced level Chainage Plotting profile

= 2 X 1m = 2 X 1m = point 1 X 1m Graph lines 3 X 1 Total

(max – 8m)

8m 20m

4

a ) i.) F = ma p = F/A = ma /A = 200 KPa A = 0.1 m2 a = gravity = 10 ms-1 m = pA/a = 2000 X 0.25 10 = 50 Kg Marking

Formula = 2 X 1m Calculation process = 2m Answer = 2m

6m

ii) W = F X d = 500 X 0.02 = 10 J P=W/t = 10 / 5 = 2.0 W Marking

b)

Formula = 2 X 1m Calculation process = 2m Answer = 2m

6m

i) • Pipe too long Paip terlalu panjang • Too many joints Terlalu banyak penyambungan • Too many bends Pembengkokan yang tidak sesuai • Liquid too dense Kelikatan bendalir terlalu tinggi • Pipe too small Paip terlalu kecil Marking

Any two points = 2 x 1m

2m

c)

Marking

All pipelines are correctly joined = 3 X 1m Q, R and S symbols are correct = 3 X 1m Supply source components = 2 X 1m

(max = 6m) Total

6m 20m

5

a) i) Radio broadcast system ii) TV broadcast system iii) Telephone Marking

Any three answer = 3 X 1m

3m

b) i) Transmitter earth station produced the uplink signal 6 GHz and transmits to communication satellite ii) Communication satellite receives the uplink signal 6 GHz from earth station and convert to downlink signal 4 GHz iii) The downlink signal 4 GHz is then transfer to the receiver earth station iv) The receiver earth station received the downlink signal 4 GHz Marking

Four point in sequent = 4 X 1m

4m

c)

Marking

7m

Seven correct block with label = 7 X 1m

i) LNA amplifies the weakest signal from the received signal ii) Mixer convert the frequency of carrier signal from 6GHz to 4GHz iii) Local oscillator generate the carrier signal for the heterodyne process in the mixer iv) Amplifier amplify the signal from the mixer v) Bass pass filter (1 & 2) allow only 4GHz carrier frequency for the next process vi) Antenna amplify the power of the 4GHz signal up to 20W before propagating out from downlink antenna Marking

Six correct sequent steps = 6 X 1m

6m Total

20m

6

a) b)

Injab kawalan aliran sehala (max – 8m)

2m

8m c) When push button is pressed, the 4/2 directional control valve in position P2 Apabila punat tekan ditekan, injab kawalan arah 4\2 berada pada kedudukan P2

2m

The compressed air will insert through port P to B Udara mampat akan masuk ikut saluran P ke B

1m

The piston moves inward and its rod pull the cap. The toxic waste can be insert. Omboh masuk dan menarik penutup terbuka. Sisa toksik dimasukan

1m

When the pushbutton is released, 4/2 directional control valve change back the position to P1. Apabila punat tekan dilepaskan, injab kawalan arah 4/2 kembali pada kedudukan P1.

2m

The compressed air will insert through port P to A Udara mampat masuk ikut saluran P ke A

1m

The piston moves outward and the cap is closed. Omboh keluar dan penutup tertutup

1m

During closing processes, the speed of compressed air flow is controlled and the cap movement is controed. Semasa gerakan tutup aliran udara mampat dikawal kelajuannya, penutup tertutup dengan kelajuan yang dikawal.

2m

Total

20m

7

a)

(i) Human   (ii) Function   (iii) Strength    Marking

The height of the table is suitable for human. Round shape table top – comportable for 8 person. The table is easy to move and easy to keep – foldable stand The turntable make everybody easy to serve the foods. Stand made of stailess steel– strong and light. Stopper –fix the stand and the table surface properly. Table top made of ‘chip board’- longlasting and light 7m 2m

7 factors = 7 X 1m Sketches = 1 X 2m

(b) Situation, Design brief, Thimking of ideas, Expanding ideas, Solution and details, Modelling/prototype, and Testing the design. Marking

any 4 answers = 4 X 1m.

4m Total

20m