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20+ Tekskills Interview Questions and Answers

Updated 28 Jun 2024
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Q1. What is conductor, insulator and semi conductor?

Ans.

Conductor, insulator and semiconductor are materials that conduct electricity in different ways.

  • Conductors allow electricity to flow through them easily, such as copper and aluminum wires.

  • Insulators do not allow electricity to flow through them easily, such as rubber and plastic.

  • Semiconductors have properties of both conductors and insulators, such as silicon and germanium.

  • The conductivity of a material can be measured by its resistance to the flow of electricity.

  • Conductivity...read more

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Q2. Why do we use semiconductor in electronics

Ans.

Semiconductors are used in electronics for their ability to control the flow of electricity.

  • Semiconductors have a unique property of being able to switch between conducting and insulating states.

  • They are used in transistors, diodes, and integrated circuits.

  • Examples include silicon, germanium, and gallium arsenide.

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Q3. How to make a semiconductor p type and n type

Ans.

Semiconductor doping is used to make a semiconductor p-type or n-type by introducing impurities with different valence electrons.

  • To make a semiconductor p-type, impurities with three valence electrons (e.g., boron) are added.

  • To make a semiconductor n-type, impurities with five valence electrons (e.g., phosphorus) are added.

  • Doping alters the conductivity and creates majority and minority charge carriers.

  • P-type has holes as majority carriers, while n-type has electrons as major...read more

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Q4. What are logic gates and why do we use it

Ans.

Logic gates are electronic circuits that perform logical operations on one or more inputs to produce an output.

  • Logic gates are used in digital electronics to create complex circuits and perform mathematical operations.

  • There are several types of logic gates, including AND, OR, NOT, NAND, NOR, XOR, and XNOR gates.

  • Logic gates are the building blocks of digital circuits, and are used in everything from simple calculators to complex computer processors.

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Q5. What is conductor,insulator and semi conductor?

Ans.

Conductor, insulator, and semiconductor are materials that conduct electricity in different ways.

  • Conductors allow electricity to flow through them easily, such as copper and aluminum wires.

  • Insulators do not allow electricity to flow through them easily, such as rubber and plastic.

  • Semiconductors have properties of both conductors and insulators, such as silicon and germanium.

  • The conductivity of a material can be determined by its band gap, which is the energy required for an e...read more

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Q6. Most used semiconductor in electronics

Ans.

The most used semiconductor in electronics is silicon.

  • Silicon is abundant and has excellent semiconductor properties.

  • It is used in microprocessors, memory chips, and other electronic components.

  • Other semiconductors like germanium and gallium arsenide are also used in specialized applications.

  • Silicon is preferred due to its low cost, high reliability, and ease of manufacturing.

  • Advancements in silicon technology have led to the development of smaller and more powerful electroni...read more

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Q7. What are header files

Ans.

Header files contain declarations of functions, variables, and data structures used in a program.

  • Header files are included at the beginning of a source code file using #include directive

  • They provide information about the functions and variables used in the program

  • They help in avoiding redefinition of functions and variables

  • Examples of header files are stdio.h, math.h, string.h, etc.

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Q8. Write a program that reverses a string without using any of the string library functions.

Ans.

Program to reverse a string without using string library functions.

  • Create a function that takes an input string as an array of characters.

  • Use two pointers, one at the beginning and one at the end of the array, swap the characters and move the pointers towards each other until they meet.

  • Handle edge cases like empty string or strings with odd number of characters.

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Q9. Explain storage classes with respect to memory layout of a C binary.

Ans.

Storage classes in C determine the scope, lifetime, and visibility of variables.

  • Storage classes include auto, register, static, extern, and typedef.

  • Auto variables are stored on the stack and have local scope.

  • Register variables are stored in CPU registers for faster access.

  • Static variables have global scope but limited visibility.

  • Extern variables are declared in one file and can be used in another.

  • Typedef is used to create new data types for better code readability.

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Q10. Write a program to implement linked list using dynamic memory allocation.

Ans.

Program to implement linked list using dynamic memory allocation

  • Allocate memory for each node using malloc() function

  • Use pointers to link nodes together

  • Free memory using free() function to avoid memory leaks

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Q11. What is the property of diode?

Ans.

Diode is an electronic component that allows current to flow in one direction only.

  • Diode has two terminals - anode and cathode.

  • It has a forward voltage drop and a reverse breakdown voltage.

  • It is commonly used in rectifiers, voltage regulators, and signal demodulators.

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Q12. Explain the critical differences between a Structure and a Union.

Ans.

Structures are used to store different data types under one name, while unions allow different data types to be stored in the same memory location.

  • Structures allocate memory for each member separately, while unions share the same memory location for all members.

  • Structures are used when all members need to be accessed independently, while unions are used when only one member needs to be accessed at a time.

  • Example: struct Person { char name[20]; int age; }; union Data { int num...read more

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Q13. Prime numbers program

Ans.

A program to find prime numbers

  • Start with a loop to iterate through numbers

  • Check if each number is divisible by any number less than itself

  • If not, add it to a list of prime numbers

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Q14. Explain about biasing

Ans.

Biasing is the process of providing a DC voltage or current to establish a desired operating point for electronic components.

  • Biasing is used to ensure that electronic components operate within their specified range.

  • It involves setting the appropriate voltage or current levels to achieve the desired performance.

  • Biasing is commonly used in transistors, amplifiers, and other electronic circuits.

  • There are different types of biasing techniques such as fixed bias, self-bias, and vo...read more

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Q15. Application of zener diode

Ans.

Zener diode is used as a voltage regulator and to protect circuits from overvoltage.

  • Zener diode maintains a constant voltage across its terminals when reverse biased

  • It is used in voltage regulator circuits to provide a stable output voltage

  • Zener diodes are also used to protect circuits from overvoltage by shunting excess voltage to ground

  • They are commonly used in power supplies, voltage regulators, and surge protectors

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Q16. Explain compilation process of c programming

Ans.

Compilation process of C programming involves preprocessing, compiling, assembling, and linking.

  • Preprocessing: Includes header files, macro expansion, and conditional compilation.

  • Compiling: Translates source code into assembly code specific to the target platform.

  • Assembling: Converts assembly code into machine code in object files.

  • Linking: Combines object files and libraries to generate an executable file.

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Q17. What is static keyword in c

Ans.

The static keyword in C is used to declare variables and functions with a local scope that persists throughout the program's execution.

  • Static variables retain their value between function calls

  • Static functions can only be called within the file they are defined in

  • Static variables are initialized only once at the start of the program

  • Static keyword can also be used to limit the scope of global variables to the file they are defined in

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Q18. Explain memory layout a C binary.

Ans.

Memory layout in a C binary refers to how different types of data are stored in memory.

  • Memory layout includes sections like text (code), data, bss, heap, and stack.

  • Global variables are stored in data section, uninitialized global variables in bss section.

  • Dynamic memory allocation using malloc() and calloc() is stored in heap section.

  • Local variables and function call information are stored in stack section.

  • Example: int x = 5; is stored in data section, int y; is stored in bss ...read more

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Q19. What is a diode?

Ans.

A diode is an electronic component that allows current to flow in only one direction.

  • It has two terminals: an anode and a cathode.

  • It is commonly used in rectifiers, voltage regulators, and signal limiters.

  • Examples include the 1N4148 and 1N4001 diodes.

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Q20. What is functional pointer

Ans.

A functional pointer is a pointer that points to a function instead of a data object.

  • Functional pointers are used to call functions indirectly.

  • They can be passed as arguments to other functions.

  • Example: int (*ptr)(int, int) = &add; where add is a function that takes two integers and returns an integer.

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Q21. Name all the gates

Ans.

There are three basic logic gates: AND, OR, and NOT.

  • AND gate outputs 1 only if all inputs are 1

  • OR gate outputs 1 if any input is 1

  • NOT gate outputs the opposite of its input

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Q22. Explain types of biasing

Ans.

Biasing is the process of providing a DC voltage or current to establish a suitable operating point for an electronic device.

  • Types of biasing include fixed bias, self-bias, voltage divider bias, and emitter bias.

  • Fixed bias involves connecting a DC voltage source directly to the base of a transistor.

  • Self-bias involves using a resistor to provide negative feedback to stabilize the operating point.

  • Voltage divider bias involves using two resistors to create a voltage divider that...read more

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Q23. Truth table of xor

Ans.

XOR is a logical operator that returns true if and only if both inputs are different.

  • XOR is represented by the symbol ^.

  • The truth table of XOR has two inputs and one output.

  • If both inputs are the same, the output is false. Otherwise, the output is true.

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