BAHAGIAN PENGURUSAN SEKOLAH BERASRAMA PENUH DAN SEKOLAH KECEMERLANGAN KEMENTERIAN PELAJARAN MALAYSIA

Transcription

1 3764/2PP BAHAGIAN PENGURUSAN SEKOLAH BERASRAMA PENUH DAN SEKOLAH KECEMERLANGAN KEMENTERIAN PELAJARAN MALAYSIA PENTAKSIRAN DIAGNOSTIK AKADEMIK SBP 202 PERCUBAAN SIJIL PELAJARAN MALAYSIA TEKNOLOGI KEJURUTERAAN PERATURAN PEMARKAHAN KERTAS 2 Kertas ini mengandungi 5 halaman bercetak 3764/2PP 202 Hak Cipta BPSBPSK [Lihat Halaman Sebelah

2 2 3764/2PP TRIAL SPM 202 ENGINEERING TECHNOLOGY - PAPER 2 MARKING SCHEME No. Soalan (a) i) Inner Thread A Jawapan a) Firstly, mark the centre point using centre punch and hammer. b) Clamp the workpiece to a vice. c) Drill the centre point using drill bit size 8.5 mm diameter d)fit tap size M0x.5 to a wrench. e)positioned the tap vertically to the hole. f)turn the wrench clock wise. g)then turn the wrench anti clock wise. h) Repeat steps f and g until the tap shank is reached. i)then use plug tap and repeat steps f and g. j)finally use bottoming tap and repeat steps f and g. (Maksimum 6 markah) Pemarkahan 6m ii) Groove C i) Clamp the workpiece to a vice. ii) Cut straight line ab and cd using hacksaw. iii) Mark along bd using centre punch. iv) Drill the marked point using drilling machine. m m m m i) Cut the unused part using chisel and hammer. m ii) Smoothes the uneven surface using file until reach the line needed. m 6m 3764/2PP 202 Hak Cipta BPSBPSK

3 3 3764/2PP (b). Mark the centre point using centre punch and hammer. 2. Clamp the workpiece to a vice. 3. Drill a hole on the panels to be joined using drilling machine. 4. Place a rivet in the hole. 5. Place the rivet nail into the rivet gun. 6. Press the gun trigger until the nail comes out from the rivet and then leaves the rivet stuck to the joint. Sketching m m m m m m 2m 8m 3764/2PP 202 Hak Cipta BPSBPSK

4 4 3764/2PP (2a) i)pembinaan acuan - Acuan berbentuk tiang dan rasuk dibina dengan menggunakan kayu dan papan lapis. - Papan lapis dicantum dengan menggunakan paku. - Acuan perlulah disokong supaya lebih kukuh. ii) Pemasangan tetulang keluli - Jenis yang digunakan ialah tetulang keluli tegangan tinggi berbentuk berbunga. - Keluli dibentuk seperti bentuk L - Besi pencekak dibentuk segi empat dan Besi pencekak akan diikat kepada tetulang keluli dengan menggunakan dawai halus. - Tetulang keluli ditempatkan ke dalam kotak acuan sebelum penuangan konkrit. iii.penuangan konkrit / Meletak konkrit - Konkrit dibancuh dengan menggunakan nisbah bancuhan konkrit :2:4. - Konkrit kemudian diletakkan dalam acuan tiang dan rasuk sehingga penuh. - Konkrit menjalani proses pemadatan bagi mengeluarkan udara terperangkap. - Setelah penuh, bahagian paling atas tiang dan rasuk di ratakan - Menjalankan proses kuring dengan menggunakan guni basah atau membasahkan permukaan konkrit dengan air. iv.pembukaan acuan - Acuan dibuka selepas 2 hingga 6 hari penuangan konkrit. - Acuan perlulah dibuka dengan berhati-hati supaya boleh digunakan semula (Mana-mana keterangan : 4 x M = 4M) 3764/2PP 202 Hak Cipta BPSBPSK

5 5 3764/2PP (Lakaran :2 x M = 2M) - Maksimum = 5 markah (b) Tujuan Kuring - Kuring untuk mengawal kandungan lembapan konkrit. - Mengawal suhu konkrit selepas diletak 3 kaedah kuring a) Menutup permukaan konkrit dengan guni b) Merendam permukaan konkrit dengan air c) Membasahkan konkrit dengan air d) Menyapu bahan kimia pada permukaan konkrit - Mana-mana jawapan ( 3 markah) 2M 3M 3764/2PP 202 Hak Cipta BPSBPSK

6 6 3764/2PP 3. Back Sight Intermediate Sight Fore Sight Rise Fall Reduced Level Chainage (m) Remarks Pandangan Belakang Pandangan Antara Pandangan Hadapan Naik Turun Aras Laras Rantaian (m) Catatan BM, RL BA, AL = Point A Point B Point C Transfer Point D Point E Point F BM 2, RL 2 BA 2, AL 2 = = = =.48 Error = = Mark Data fill in = 4 X m Rise and fall calculation = 4 X m Reduced level calculation = 4 X m Arithmetic check calculation = 3X m Error calculation = X m Maximum marks = 6m 3764/2PP 202 Hak Cipta BPSBPSK

7 /2PP Imaginary datum Datum andaian Reduced Level Aras Laras Chainage Rantaian Marking Reduced level = m Chainage = m Plotting profile = m (max 4m) Graph lines = m 3764/2PP 202 Hak Cipta BPSBPSK

8 8 3764/2PP QUESTIONS ANSWERS MARKS 4(a) Wall area Walled up area = p x l = [ 0 x 2.5] + [5 x 2 ] m 2 = m 2 = 35 m 2 m m m Walled area rate = walled up area x cost rate = 35 m 2 x RM450.00/ m 2 = RM60,750 Open area = [0 x 3.5] + [5 x 3.5]+ [5 x 8] = = 92.5 m 2 Open area rate = 92.5 m 2 x RM380/ m 2 = RM 35,50.00 Total cost of the house = RM60, RM 35,50.00 = RM 95, m m 2m m m m 2m m m 4m 4(b) Volume of 9 column = 9 x 0.4 m 3 =.26 m 3 m m Isipadu simen asas pad = / 7 x.26 m 3 = 0.8 m 3 m m Kos simen = isipadu x kadar = 0.8 m 3 x RM 280/ m 3 = RM m m 6m 20m 3764/2PP 202 Hak Cipta BPSBPSK

9 9 3764/2PP 5a 8 markah 3764/2PP 202 Hak Cipta BPSBPSK

10 0 3764/2PP 5b RAISING THE ARM MENAIKKAN LENGAN. When the motor is started, the pump will operate. Apabila motor dihidupkan, pam akan beroperasi. 2. High-pressured fluid is formed and stopped flowing in the directional-control valve 4/3 in half position (K2). Bendalir bertekanan tinggi dihasilkan dan berhenti mengalir pada injap kawalan arah 4/3 pada kedudukan henti (K2). 3. If the pressure is above the set-limit, the pressure release valve will operate. Jika tekanan melebihi daripada kadar yang ditetapkan, injap pelega tekanan akan beroperasi. 4. When the push button is press, directional-control valve 4/3 changes its position from K2 to K. Apabila punat tekan ditekan, injap kawalan arah 4/3 berubah dari kedudukan K2 ke K. 5. High-pressured fluid will flow through the directional-control valve where the speed is adjusted. Bendalir bertekanan tinggi melalui injap kawalan aliran dimana kelajuannya diselaraskan. 6. The high-pressured fluid goes into area A of the cylinder and pushes the piston up to raise the arm high. Bendalir bertekanan tinggi terus memasuki ruang A silinder dan menolak omboh ke atas untuk menaikkan lengan robot. 7. The hydraulic fluid in area B of the cylinder will move out to the tank. Bendalir hidraulik di ruang B silinder akan keluar dan terus masuk ke tangki. LOWERING THE ARM MENURUNKAN LENGAN 8. When push-button is pulled, directional-control valve 4/3 changes position from K2 to K3 Apabila punat tekan ditarik, injap kawalan arah 4/3 berubah dari kedudukan K2 ke K3. 9. High-pressured fluid flows through directional-control valve and immediately enters cylinder B area and pushes the piston to the bottom to lower the arm. Bendalir bertekanan tinggi melalui injap kawalan aliran dan terus memasuki ruang B silinder dan menolak omboh ke bawah untuk menurunkan lengan. 0. High-pressured fluid in area A of the cylinder moves out and enters the tank. Bendalir hidraulik di ruang A silinder akan keluar dan terus masuk ke tangki. 3764/2PP 202 Hak Cipta BPSBPSK

11 3764/2PP HALTING ARM IN ANY POSSIBLE POSITION MENGHENTIKAN LENGAN ROBOT DI MANA-MANA KEDUDUKAN.. When push-button is released, spring pushes the plunger to enable directional-control valve 4/3 to be in K2 position. Apabila punat tekan dilepaskan, pegas menolak pelocok supaya injap kawalan arah 4/3 berada pada kedudukan K2. 2. The high-pressured fluid will be prevented and the piston will not budge. Bendalir bertekanan tinggi tersekat dan omboh tidak dapat bergerak. [Any ten- 0 x m = 0m] [mana-mana sepuluh-0 x m = 0m] 0 markah ( manamana operasi) 5c i.fit for heavy duty job Sesuai bagi kerja berat ii.silent Senyap iii.smooth movement Pergerakan lancar/ tidak tersekat-sekat 2 markah [Any 2 x m = 2m] [ mana-mana 2 x m= 2m] 3764/2PP 202 Hak Cipta BPSBPSK

12 2 3764/2PP 6 (a) Circuit A is not suitable. Push button PM is pressed, contact coil P will become electromagnetic Normally open contactor P will be closed on circuit, motor M will start Push button PM2 is pressed, contact coil P2 will become electromagnetic Normally open contactor P2 will closed, motor M2 will start while motor M is still running. Motor M2 can operates without switching on motor M Circuit B is suitable. Any 4 statements = 4m Push button PM is pressed, contact coil P will become electromagnetic All normally open contactor P will be closed on circuit, motor M will start Push button PM2 is pressed, contact coil P2 will become electromagnetic Normally open contactor P2 will closed, motor M2 will start Motor Mwill stop operating because P2 in circuit is open. Circuit C is not suitable. Any 4 statements = 4m Push button PM is pressed, contact coil P will become electromagnetic All normally open contactor P will be closed on circuit, and circuit 2, motor M will start Push button PM2 is pressed, contact coil P2 will become electromagnetic Normally open contactor P2 will closed, motor M2 will start while motor M is still running. To stop motor M, PH must be pressed. This will cause motor M2 will stop as well. Any 4 statements = 4m 6 (b) Timer Relay Coil TR at motor M2 Normally closed timer Relay Green light at M Red light at M2 Joints completed 5 marks m m m m m 3764/2PP 202 Hak Cipta BPSBPSK

13 3 3764/2PP 5 marks Total : 20 marks ( Litar A dan Litar C diterima jika kedudukan lampu R, G dan TR berfungsi jika memenuhi situasi 6(b). 3764/2PP 202 Hak Cipta BPSBPSK

14 4 3764/2PP No. Penerangan soalan 7 a)i) Jarak antara palang kayu tidak sesuai / terlalu jauh antara satu sama lain. - Aras lantai tilam tinggi / hanya sesuai untuk bayi belum memanjat. - Tiada roda untuk menggerakkan katil. - Katil tidak boleh dilipat. ii) i- Rapatkan jarak di antara palang kayu / Tambahkan palang kayu. ii- Ketinggian lantai tilam bayi boleh dilaraskan ke aras yang lebih rendah bergantung kepada usia bayi. iii- Pasangkan roda pada kaki katil bayi supaya mudah dialihkan. Roda perlu ada stopper supaya katil tidak bergerak. iv- Pasang engsel supaya katil boleh dilipat apabila tidak digunakan. Perlu pasang palang keselamatan untuk memastikan katil tidak terlipat semasa digunakan. Lakaran berlabel yang sesuai Pemarkahan x m 3764/2PP 202 Hak Cipta BPSBPSK

15 5 3764/2PP - Jika jawapan lain.. - Ikut kesesuaian idea pelajar berdasarkan penyelesaian. - Diberi markah berkadaran. 7 b)faktor: i- Human ii- Functional iii- Strength iv- Aesthetic 3764/2PP 202 Hak Cipta BPSBPSK