1 / 20

HOW TO FACE VIVA VOCE EDC/WS LABS

HOW TO FACE VIVA VOCE EDC/WS LABS. Prof. K.APPA RAO ME(IISc),FIETE,MCSI. Email: apparao_kotha@hotmail.com Web site: www.freewebs.com/apparao_kotha Tel : 040-2774 9839, 040 3243 0039 (cell). COMMON QUESTIONS FOR EDC/WS LABS. WHAT IS THE DIFFERNECE BETWEEN

mervyn
Download Presentation

HOW TO FACE VIVA VOCE EDC/WS LABS

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. HOW TO FACE VIVA VOCE EDC/WS LABS Prof. K.APPA RAO ME(IISc),FIETE,MCSI. Email: apparao_kotha@hotmail.com Web site: www.freewebs.com/apparao_kotha Tel : 040-2774 9839, 040 3243 0039 (cell)

  2. COMMON QUESTIONS FOR EDC/WS LABS

  3. WHAT IS THE DIFFERNECE BETWEEN THOERY AND PRACTICE ? Theory is abstract: Practical is specific and concrete. Example: Type: Carbon film CF Value : 1000 ohms Tolerance: 5 % Wattage: 1 watt. Style : axial. Size : 4 x 20mm…

  4. BASIC COMPONENTS PASSIVE COMPONENTS R,L,C ACTIVE COMPONENTS D,Q,Z,FET,SCR etc. • COMMON QUESTIONS • SYMBOLS, PHYSICAL IDENTIFIATION • ELECTRICAL CHARECTERISTICS • VI CURVES, PARAMETERS ß, α, β, PIV, • RELATION BTWN PARAMETERS.

  5. TOOLS USED NOSE PLIER, CUTTER, SOLDERING IRON etc INSTRUMENTS USED VOLT METERS,MILLI AMMETRS MULTIMETERS, DMM OSCILLOSCOPE, POWER SUPPLY, FUNTION GENERATOR etc.

  6. QUESTIONS ON PASSIVE COMPONENTS *I HAVE ONLY 1/4 w RESITORS. I WANT 10K 1W. HOW CAN I MAKE ? SOLUTION: 2.5 K 1/4w RESITORS 4 IN SERIES. OR 40K 1/4w RESITORS 4 IN PARALLEL.

  7. COLOR CODE OF RESISTORS. WHAT IS COLOR CODE FOR 1.5K 5 % (Br Gr, R , Gold) 82K 10% (Grey,R,Or Silver) 39 M 20 % (Or, Wh, Bl ) 2.2 OHM ? (R,R, Gold, Gold).

  8. MEASUREMENTS ON PASSIVE COMPONENTS. • AN ELECTROLYTIC CAPACITOR • MFD measures 90 MFD. • IS IT ACCEPTABLE ? • YES • Electrolytic capacitors will have • Tolerance –20 % to + 40 %

  9. A RESITOR IN DIODE CHARACTERISTIC EXPERIMENT AS SHOWN IS USED. What wattage rating is required ? Maximum current= 30/1=30ma Power dissipated in R= vxi=30x30 =900mw . Practical value 1watt Change V , max current find R & Wattage.

  10. QUESTIONS ON AMMETERS AND VOLTMETERS WHAT IS INTERNAL RESISTANCE OF IDEAL AMMETER ? Ans: ZERO. IDEAL VOLTMETER ? ANS : INFINITY. why ? justify *

  11. QUESTIONS ON MULTIMETRS, DMM IS ANALOG MULTI DC OR AC METER? HOW SEVERAL RANGES ARE ACHEIVED? HOW CAN YOU CONVERT AMMTER TO VOLTMETER ? WHAT IS LED / LCD ? WHAT CAN DMM MEASURE? WHAT DO U MEAN BY 3 ½ DIGIT DMM?

  12. SPECIFIC QUESTIONS TO WORK SHOP LAB…MATERIALS WHAT IS PCB ? WHAT IS DICLAD,SINGLE CLAD/ WHAT IS CHEMICAL USED FOR ETCHING ? WHAT DRILL BIT HAVE USED FOR ‘R’. WHAT IS SPEC OF SOLDERING IRON. WHAT IS SOLDER MADE OF? WHAT IS FLUX ?WHY DO U USE ? TYPES OF RESISTORS ,CAPACITORS,INDUCTOR? SWICTHES,FERRITE CORES,KNOBS.

  13. COMMON QUESTIONS TO EDC/WORK SHOP LAB…INSTRUMENTS OSCILLOSCOPE REGULATED POWER SUPPLY FUNCTION GENERATORS MULTIMETER,DMM DC MOVING COIL V,ma meters.

  14. KNOWLEDGE OF ELECTROMECHANICAL COMPONENTS. FUSE, fast blow off/slow blow off. function,construction. What is fuse electrically? BINDING POST,SOCKETS,KNOBS, BANANA PLUGS,BNC,CONNECTORS. WIRES/CABLES…S/S,MULTI STRAND. SHIELDED CABLES,HOOK UP WIRES.

  15. KNOBS: screw,collet, concentric, pointed, dials etc.for ¼,1/8 inch. SWITCHES: spst,dpst,sping loaded, rotary, slide,toggle,lever, etc.. TRANSFORMERS: power,audio,radio, pulse, winding wires,en cu wires. Coils: air core, rf, bifilar, RELAYS:function. HARDWARE: screws,nuts sizes(BA/mm),head styles. slot/star types.

  16. KNOWLEDGE OF OSCILLOSCOPE SINGLE/DUAL TRACE modes XY, component tester modes. Band width,rise time relation. Uses: BLOCK Diagram of CRO. Double beam/dual trace Why sweep is saw tooth?

  17. SHOW YOUR KNOWLEDGE IN REPORT ? How ? ? VERY SIMPLE … Make it more practical in aim, apparatus, procedure, description, curves, and choosing measurement points. see a simple example.

  18. AIM: forward,reverse characteristics of given diode under its ratings. APPARATUS: Components: Si diode 1N 4007…. 1no. CF resistor 1K 5 % 1w..1no. insruments: DC regulated power supply0-30v..1no Dc moving coil milli ammeter 30mafsd. 1no 3 ½ digit DMM LCD type… 1no. others: Bread board, S/S hook up wires.

  19. IMPORTANT HINTS. TALK POLITELY & CONFIDENTLY. EXPLAIN WITH FIGURES IF U CAN. BE PRECISE AND SHORT. DO NOT BE IN HURRY TO ANSWER. YOU CAN DO WELL.

  20. ALL THE BEST.. BE PRACTICAL… GOOD LUCK.. Prof. K.Appa Rao.

More Related