Frequently Asked Question

Frequently Asked Question in EXAM

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Read the exam questions.

1) How to identify Base, Emitter and collector of a Transistor ?
2) How to identify common(VCC) pin of Pullup resistor ?
3) How to identify input, output and ground of 7805 / 7812 ?
4) How to identify NO, NC contacts of Relay ?
5) How to identify Pin number 1 of any IC ?
6) How to identify 'Polarity' of Capacitor ?
7) How to identify 'Polarity' of Diode ?
8) How to identify 'Polarity' of LED ?
9) How to identify Primary and Secondary of a Transformer 10) How to identify 'Value' of Ceramic capacitors ?
11) How to identify 'Value' of Electrolatic capacitors ?
12) How to identify 'Value' of Resistor ?
13) What are the types of Capacitors ?
14) What are the types of PCB ?
15) What are the types of Resistors ?
16) What are the types of Transistors ?
17) What is ISP connector ? what are the pin connections of ISP connector ?
18) What is a Jumper ?
19) What is the crystal frequency ?
20) What is the difference between 89c51 and 89s51 ?
21) What is the difference between 89s51 and 89s52 ?
22) What is the value of Reset circuit (RC values) ?
23) Which software you have used for PCB layout ? What were the other options ?
24) Why heat sink is required for 7805 and not for 7812? Why heat sink is used for 7805 ?
25) Why heat sink is used for 7805 ?
26) Why you have selected L293D as a motor driver IC ? what were the other options ?
27) Why you have used 15 / 9 volts transformer?
28) Why you have used 7812 after the battery of 12v ?
29) Why you have chosen IR transmitter in person counter project ?
30) Which LCD you have used? What are the other types of LCDs available?
31) How can you set contract of LCD ?
32) What are the operating modes of IC555 ? Which mode you have used and why ?
33) Why you have used transistor circuit to operate relay?
34) What are the operating modes of a transistor? Which mode you have used ?
35) How is a relay activated ? What are the internal components in relay?
36) What are the pinout of a relay ?
37) What is the difference between a SPDT and DPDT relay ?
38) Which devices you can operate through realy ? Voltage and current range?
39) Why MAX232 is used in your project ? What is the function of MAX232?
40) Why you have used motor driver IC in your circuit?