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gy higher education mle & training Department: Higher Education and Training aw” REPUBLIC OF SOUTH AFRICA T720(E)(N16)T NOVEMBER EXAMINATION NATIONAL CERTIFICATE INDUSTRIAL ELECTRONICS N6 (8080186) 16 November 2015 (X-Paper) 9:00-12:00 . This question paper consists of 5 pages and 1 formula sheet of 3 Pages. Copyright reserved Please tun over (8080186) “2 T720(E\N16)T DEPARTMENT OF HIGHER EDUCATION AND TRAINING REPUBLIC OF SOUTH AFRICA NATIONAL CERTIFICATE INDUSTRIAL ELECTRONICS N6 TIME: 3 HOURS MARKS: 100 INSTRUCTIONS AND INFORMATION us Answer ALL the questions. 2 Read ALL the questions carefully. 3. Number the answers according to the nurnbering system used in this question paper. 4, Write neatly and legibly. Copyright reserved Please turn over Downloaded from hlayiso.com

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(020186) 5 T720(E\NI6)T QUESTION 6; ELECTRONIC POWER CONTROL, THYRISTOR DEVICES AND SCR 6.1 6.2 6.3 6.4 SPEED CONTROL Set up a complete, fully labeled block diagram of a CAD/CAM system. Define the term /oad-transfer switch and also give one characteristic of this ‘switch. In rectifier circuits and devices, the control characteristics of the various circuits may be placed broadly into one of three categories. Name each category, and then indicate the circuit components that each category contains. State FOUR sources of losses in power semiconductor devices. QUESTION 7: PROGRAMMABLE LOGIC CONTROLLERS 7A 7.2 73 With reference to the building biocks of a PLC, it Sengrerhe Consists of three basic items. Name these THREE items. Give the full names of the following abbreviations that are used in computing language: 7.21 CMOS, 7.2.2 RAM 7.2.3 EPROM 7.24 CPU (4x1) ‘Sketch a correct ladder diagram for an XOR logic gate. Copyright reserved (4) (4) (4) [19] (3) (4) (7) [14] 100 (8086186) as TT2O{E\N16)T INDUSTRIAL ELECTRONICS N6 FORMULA SHEET Ajnwline h-e") A = Instantaneous value and AaBett B= Maximum value VaEG-26"!*)=7-R volts Cf volts OR AR, Ry + Rry v, wR Rp Vo Ves Ris volts . Ry Ry Ry + Ry -RC- BO 1 fyi Veo . volts VR, VR, V3R, v, = 2 a i Ye | _ Supply rating = Voltage per stage x Number of stages wos Vaan = V2XVems s volts Vipcon = 0,637 XV nay =O Via . volts 3-v2 volts Vinean =——— Vine , n Vinean oy, Vines * (1+ Cos avy volts V, = wy (1+ Cos a) ean = Vis ville Vines a Vins X COS na Vis: = 332 Ver phase X (1+ Cos G6) : 2a volts Copyright reserved Please turn over Downloaded from hlayiso.com

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higher education & training Department: Higher Education and Training REPUBLIC OF SOUTH AFRICA MARKING GUIDELINE Copyright reserved NATIONAL CERTIFICATE NOVEMBER EXAMINATION INDUSTRIAL ELECTRONICS N6 16 NOVEMBER 2015 This marking guideline consists of 6 pages. Please turn over MARKING GUIDELINE 2 T720(E\N16)T INOUSTRIAL ELECTRONICS N6- QUESTION 1 41 i Le 4uiv 2 4? Le = aL aay 8 > 4x90x 10% e a Daarersecogrene ae (o} SOx 107° v a Re= 72x 108 — _——— © R= 72% 108) = R= 848530 y oem 1.2 1.2.1 The stored energy is interchanged between the capacitor and = inductor a number of times before it is finally dissipated through the e) resistance. = 1.2.2 The circuit response is fast but oscillates a number of times around = the set-point before coming to rest. "oS (2x2) (4) rT) 1.3 Passive components are only capable of absorbing electrical energy, while i ©} active components provide electrical energy. Co (2x2) (2) 1 0 = QUESTION 2 2 ¥, iA v, at Vo = —[Re xt Rp XE Be [>] ry R; Ry aA Yo = ~[1x 10° x tata nent cunt gee! | 2 200 x 10° 500 107% 1x10 v Vo = -(5-443]v Yo = —4¥y (3) Copyright reserved Please turn over

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MARKING GUIDELINE ge ‘T720(EKN16)T INDUSTRIAL ELECTRONICS NG QUESTION 5 5.1 5.2 Circuit analysis. ¥ * To determine the worst possible conditions. “ Evaluation. ~ * To ensure a margin of safety under the worst possible conditions. ” Construction review. ¥ ¢ To ensure that critical components are reliable and that the newly designed circuits will function as planned. V~ (7) * Applied to any electronic system whereby operation of the system can only be justified if all safety conditions are simultaneously fulfilled. v ~ « Expressed by a lagic AND function. ~ * The machine and all its safety devices are connected in serial mode. ¥ Example: The over-current protection of a motor. ” 1a QUESTION 6 6.1 6.2 cao/cam SOFTWARE Memory ase Lo) 208) Lol commutes} —afonaunarion over (4) It is an electro-dynamic relay which serves to rapidly transfer the computer equipment (load) from the utility to the UPS's alternate power source in the event of a mains failure. vv ~ Characteristic: It is the only moving part in the UPS system. “ (4) Copyright reserved Please turn over MARKING GUIDELINE 6 INDUSTRIAL ELECTRONICS N6- 63 Uncontrolled rectifier. ¥ + Diodes. ¥ Fully controlled rectifier. v © Thyristors. ¥ Half-controlled rectifier. “ «Thyristors and diodes. ¥” 6.4 Losses during forward conduction Losses occurring in the gate circuit Switching losses QUESTION 7 . « Losses associated with the leakage current during the blocking state . . TA * Programmer’ * Programmabie controller” * Expansion units” 72 7.21 722 7.2.3 7.24 7.3 Copyright reserved Complementary metal-oxide semiconductor. ~ Random access memory. ¥ Erasable programmable read only memory. ¥ Central processing unit. “ END T720(E\KNI6)T (4x1) TOTAL: oe co (4) ie Ss Downloaded from hlayi (7) 04} 100

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(8080186) 2 T740(ENI29)T QUESTION 1; TRANSIENTS WwW A 4 uF capacitor is connected in series with a 0,25 MQ resistor, across a 100 V supply. Calculate the following: zs Pa The time constant 1.4.2 The initial charge current 1.1.3 The potential difference across the capacitor, 3 seconds after the (1) a) supply is connected (2) 1.44 The voitage measured across the resistor, 3 seconds after the supply is connected (2) 12 in an RC circuit, one-time constant, refers to the amount of time it takes for a charging capacitor to reach 63,2% of the value of the input voltage. Thus T = RC Prove that T is indeed measured/caiculated in seconds. (4) j (10) QUESTION 2: TRANSDUCERS 21 A detector bridge has the following resistors as standard: Ri=4KO Re=6KQ Re= 12K A resistance thermometer with a nominal value of 18 KQ and a temperature coefficient of 0,001 O/N/°C is connected in the remaining arm. The supply voltage to the bridge is 60 V DC. Calculate the voltage change for a change of 120 °C above the nominal value. (7) 22 Offsetting make use of analog techniques to shift the reference level of signal by a predictable amount. Name THREE typical applications of offsetting. (3) 23 Briefly explain what must be done to the output of a transducer in order to obtain an overall linear response. (1) 01) Copyright reserved Please turn over (8080186) 4 T740(E\s29)T QUESTION 3: ULTRASONICS, X-RAYS AND RADIO ACTIVITY 3.1 3.2 3.3 3.4 Indicate whether the following statements are TRUE or FALSE. Choose the answer and write only ‘true’ or ‘false’ next to the question number {3.1.1-3.1,5) in the ANSWER BOOK. 3.44 Ultrasonic is acoustic energy at frequencies above the audible range of sound which has a limit of 50 kHz. 3.1.2 The piezo-electric effect only refers to conductive materials. ° 3.1.3 Magnetostriction only refers to non-conductive materials: 3.1.4 Cavitation takes place when ultrasonic energy is generated in a solid. iso.com excellent. ‘ / (5x 1) hiay mechanisms such as jewelry. en. ® om State FIVE properties of the cleaning fluid that is used for this technique. s The following data is available on an X-ray machine: Supply voltage = 90 kV q Target-material atomic number = 42 Cathode emission = 1 x 10" electrons/second Planck's constant = 6,636.x 10 J/s Electron charge = 1,602 x 10°C Velocity of light = 2,997 x 10° m/s Calculate the following: 3.3.1 The shortest wavelength of the X-ray produced 3.3.2 ~ The percentage efficiency ‘Downloaded fr Define a radiation detector. [18] Copyright reserved Please tum over

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(8080186) 8 INDUSTRIAL ELECTRONICS N6 FORMULA SHEET A=B-(-e") A=B-et!? v=E-(-2e""Jer-r ‘6 Vp =Vsi — RRs (Ri+Rp Ra + Rey y= RR. MeoR Vo “Ry R Ry Ry + Ry av) Vo#-RC-T erred ALG) dt +Ve(0) Rx Rx Ry A Supply rating = Voltage per stage x Number of stages Vex =¥2 X Vong 0,637 x Vunean = 0,637 Vinay = . Vee Vom misty, Vineon = Fv, x0+ cosa) Vesta 2B vy, x(+ Cosa) Vesecon 2 ‘rms ¥ COS Of Vincan wv phan X14 Cosa) Copyright reserved A= Instantaneous value and B= Maximum value T740(E)(J29)T volts volts volts volts volts volts volts volts volts Please turn over (9080186) z 3-y2 Vancan =~ Mine X Cos ot Vine = V3 XV oper phase Venax = V2 X Vine = V2 % Veuns v2 Frm = ta PA Toms = as ¢ =] ia Fins = | peak % aa Treat =the ar Tube = Number of elecirons per second xq Imax = Maximum safe illumination x Tube sensitivity Sensitivity = Cathode sensitivity x A PeP-ReV-1=V2sR X-ray power =" Pp x1 Dissipated power = Pz - Power used AR = Bry x At x temperature coefficient Tiise Zay = Tons retreat ad t i Ex petal ata @ EXa T740(€,29)T volts volts amps amps amps amps amps watis wats ohms ohms hertz Please turn over Downloaded from hlayiso.com

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== gsicy higher education — sie &training —— (ee —— if fen Department: = AG); Higher Education and Training eas REPUBLIC OF SOUTH AFRICA T740(E)(A13)T APRIL EXAMINATION NATIONAL CERTIFICATE. INDUSTRIAL ELECTRONICS N6 - (8080186). 13 April 2015 (Y-Paper) 13:00-16:00 .. \ B Scientific calculators may be used. This question paper consists of 5 pages and a formula sheet of 3 pages, Copyright reserved Piease tum over (g0801 86) 2 T74Q(EYKA13)T DEPARTMENT OF HIGHER EDUCATION AND TRAINING REPUBLIC OF SOUTH AFRICA NATIONAL CERTIFICATE INDUSTRIAL ELECTRONICS N6 TIME: 3 HOURS MARKS: 100 INSTRUCTIONS AND INFORMATION 1. ° Answer ALL the questions, 2; Read ALL the questions carefully. paper: : Fas y 7 ve 4 ALL final answers must be rounded. off to. THREE decimal places (unless indicated otherwise) re ee be kept together. \ " 6. Use only blue or black ink. / 23 Write neatly and legibly. 7 Copyright reserved Please tum over Downloaded from hlayiso.com

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+ (8080186) 5 T?40(E(A13)T QUESTION 5: ELECTRONIC SAFETY DEVICES 5.4 5.2 5.3 5.4 illustrate, by means of a neat, fully labelled circuit diagram, the special form of series shunt-protection calied redding barrier/zener barrier. State the THREE components of an optical relay, as used in photo-electric safety devices. Name the TWO types of proximity switches. Indicate whether the following statement is TRUE or FALSE. Mott your answer Positive protection is oxpreszedt by means of a logic or a function, QUESTION 6: ELECTRONIC POWER CONTROL, THYRISTOR DEVICES AND SCR 6.1 6.2 6.3 6.4 65 SPEED CONTROL One of the characteristics of a closed-loop system is the deuiée of closeness between the desired value and the measured value of the controlled variable. Name and explain the other TWO. characteristics of the closed: -loop system. Set-up a complete fully labelled Perk eqan ofa ‘CAD system. Name the FOUR prerequisites for proper cAM system operation. There are eoseneay yO methods to effect resonant commutation. Name and draw, a fully labelled circuit diagram of each of the TWO methods used to effect resonant commutation. Name the THREE methods used to achieve electrical braking. ss. QUESTION 7: PROGRAMMABLE LOGIC CONTROLLERS TEX Draw a labelied ladder diagram for a two-input logic AND gate. 7.2 : Write the’ following abbreviations in tull: 7.24 EPROM 7.2.2 EEPROM (2x1) 7.3 Distinguish between the two types of memory modules in QUESTION 7,2 7.4 Set-up a complete fully labelled block diagram of a PLC. TOTAL: Copyright reserved (4) (3) (2) (2) (11) (5) (4) (4) (8) (3) (24] (2) (2) a) (5) [10] 100 - (8080186) as T740(E\A13)T A-B-A-e!* ( : ) A= Instantaneous value and A=B-e!* B= Maximum value Vee (-2e"!*)=7-R R Ry Vp =Vs|—1— - ” ole oer ppm tht Ri Ro. Ver Vor Re Ry Ry + Ry avr) Yo == RCO = 1 Floyd + Ve(0) v= PR alt | Mie eRe Re oR Ro RR Supply rating = Voltage per stage x Number of stages Vex = V2 % Veens 0,637. > ‘mas, Vyeun = 0,637 X Vinay = et oe xd + Cos @) Vocus ~ Byggnt core Vinean fy, x Cosa Vonean a8 ‘per phase XAL+ Cos a) Viwean Py. xcwa Copyright reserved valts volts volts volts volts volis volts volts volts Downloaded from hlayiso.com

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MARKING GUIDELINE 5 TAQ{EKAI3)T INDUSTRIAL ELECTRONICS NS QUESTION 4 44 raw material Quality receity al acceptance bulk storage! protec Sl aaeais feedback line Inspection | Runs and testing recycle k#—— Grading 4 a Counting waste Rejected Sorting packaging Items Gosia chad jespatch 42 421 4 vt a 2d t= a 2X12, 5x 1077 = 480 x 10-85 ¥ Fy 1 PRR = t= t= 200KH: Vv Copyright reserved Please turn over (6) (3) MARKING GUIDELINE & TPAQ(EYA13)T INDUSTRIAL ELECTRONICS N6 4.22 _ vt aa = 5X107* x50 x 10-6 | 2 = 125mm v (2) DE QUESTION 5 u ° 51 —><H EE) [ze 8 = Fuse om Safe area ce ae Hazardous Area & e Be 2 ee - £ ~ (4) ° 5.2 * Atransmitter/ight source” ba * —Amedium for transmitting the light energy” x} * An optical receiver” (3) (7) §.3 * Inductive typew” mo) * Capacitive type” 26 5.4 False v— 2 Expressed by means of a logic - AND function. (2) £ ms Copyright reserved Please turn over

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