Karnataka 1st PUC Electronics Question Bank Chapter 9 Practical Electronic Components, Their Specifications and PCB
One Mark Questions and Answers
What is a part number?
The part number is a unique code used to identify a particular component for the convenience of the consumer or manufacturer.
Mention the important specifications of a resistor.
- Value of resistance
- Power rating
- Maximum working voltage (or voltage rating).
For what application, fusible resistors are used?
The fusible resistor is used as a fuse under faulty conditions to protect the circuit.
What is the important specification of a capacitor?
- Capacitance value and
- Maximum voltage rating.
Name the type of capacitor having polarity.
Write a part number for a diode.
How many pins are present in a diode bridge?
Mention any one type of a seven-segment display.
Common anode seven segment display.
What do we mean by 16 × 2 LCD?
16 × 2 LCD means a two-line 16 characteristics LCD display.
Mention one specification of a speaker.
Mention a part number of a commonly used temperature sensor.
Mention any one ease style of a transistor.
Mention any one part number of a positive voltage regulator.
78XX series voltage regulators are positive voltage regulators.
Mention any one part number of a negative voltage regulator.
79XX series voltage regulators are negative voltage regulators.
Name the chemicals used for the etching process in PCB designing.
Ferric chloride, hydrochloric acid, acetone.
Two Mark Questions and Answers
What do you mean by the datasheet?
A datasheet is a document summarizing the performance and other technical characteristics of a component.
What do you understand by part number of an electronic component?
Datasheet of the part number provides detailed specifications like physical, mechanical, and electrical parameters.
What information does a package details of a component give?
A package of electronic components gives details on body size, mount area, thickness, pins, the pitch of the pins, power dissipation tapping directions.
What do you mean by SIP and DIP packages?
The single in-line package (SIP) has one row of connecting pins. Dual inline package (DIP) is packaged with two rows of leads on two sides of the package.
Write any two specifications of a transformer.
- Input voltage
Mention any two types of relays available in the market.
- SPST (single pole single throw)
- SPDT (single pole double throw)
Mention any two types of transistors case styles available in the market.
- TO – 39
Write any two specifications of LEDs.
Diameter, color, quality.
Write any one part number for npn and pnp transistor.
SL – 100: npn transistor
SK -100: pnp transistor.
What is the etching process?
An etching process is removing the unnecessary copper after UV exposure, leaving behind only the desired copper tracks. K
Three Mark Questions and Answers
List any five advantages of the datasheet.
- Product number and name
- Pin connection diagram.
- Absolute minimum, maximum ratings.
- Recommended operating conditions.
- Input/output waveshape diagrams.
Write the steps involved in PCB designing.
PCB layout preparation: PCB layout must be drawn using PC. The complete circuit must be drawn on paper. Prepare computer layout as per circuit diagram using PCB design software. Draw tracks for connecting one component to the other. Take printout on a white sheet and get the film done on a transparent sheet by filmmakers.
Photoresist: Photoresist film or mask is placed on a copper clad board. UV light is exposed on a copper-clad board covered by photoresist film. UV light does not pass through the photoresist on the tracks. The copper area which is not covered protected by photo-resist is removed during the etching process.
PCB etching process: The etching process is done to remove the unnecessary copper after UV exposure, leaving behind only the desired copper tracks. The PCB is then dipped in ferric chloride or hydrochloric acid until unwanted copper is dissolved.
Then the PCB is dipped in acetone to remove the black color giving the PCB a shining attractive look.
PCB Drilling: The components to be attached to PCB can be done only by vias drilling ie, by drilling a hole. To make PCB good solderable the surface of the PCB is coated with tin or nickel.
PCB assembling: The electronic components are assembled on the respective holes in the PCB. The component leads are electrically and mechanically fixed to the board with solder.