Narayana Coaching Center Interview Questions and Answers

Motors are rated in KW because they consume power, while transformers and generators are rated in KVA because they produce power.

• Motors convert electrical energy into mechanical energy, so they consume power and are rated in KW.

• Transformers and generators produce electrical energy, so they are rated in KVA based on their apparent power.

• KVA takes into account both the real power (KW) and the reactive power (KVAR) produc...read more

The type of motor used in ceiling fans is an induction motor.

• Ceiling fans typically use single-phase induction motors.

• These motors are designed to provide a constant speed and are efficient in converting electrical energy into mechanical energy.

• The motor consists of a stator and a rotor, with the stator being the stationary part and the rotor being the rotating part.

• The stator contains windings that create a rotating m...read more

A thermal power plant generates electricity by converting heat energy into mechanical energy.

• Thermal power plants use fossil fuels or nuclear energy to heat water and produce steam.

• The steam drives a turbine, which is connected to a generator that produces electricity.

• The heat source can be coal, natural gas, oil, or nuclear reactions.

• The steam is condensed back into water and recycled in a closed-loop system.

• Thermal p...read more

A program to generate a geometric progression (GP).

• Take the first term, common ratio and number of terms as input.

• Use a loop to calculate each term of the GP.

• Print the generated GP as output.

A program to print factorial using recursion

• Define a function to calculate factorial recursively

• Base case: if the number is 0 or 1, return 1

• Recursive case: multiply the number with factorial of (number - 1)

• Print the factorial of a given number

Logic to reverse a string without using string functions

• Iterate through the string from the last character to the first

• Create a new string and append each character to it in reverse order

I know multiple programming languages including Java, Python, and C++.

• Proficient in Java with experience in developing web applications using Spring framework

• Familiar with Python for data analysis and machine learning

• Experience in C++ for developing high-performance applications

• Also familiar with HTML, CSS, and JavaScript for front-end development

Class is a blueprint for creating objects, encapsulation is the process of hiding data and methods within a class.

• Class is a template or blueprint that defines the properties and behaviors of an object.

• Encapsulation is the process of bundling data and methods together within a class, hiding the internal details from the outside world.

• Other features of OOP include inheritance, polymorphism, and abstraction.

• Inheritance a...read more

Program to find the sum of squares of each term of Fibonacci series

• Generate Fibonacci series using loop or recursion

• Calculate square of each term

• Add all squares to get the sum

I would like to join Cognizant because of its reputation as a leading global technology and consulting company.

• Cognizant has a strong presence in the industry and is known for its innovative solutions.

• I am impressed by Cognizant's commitment to digital transformation and its ability to deliver value to clients.

• The company offers excellent career growth opportunities and a supportive work environment.

• Cognizant's diverse...read more

Polymorphism is the ability of an object to take on many forms. In C++, it is achieved through function overloading and virtual functions.

• Polymorphism allows objects of different classes to be treated as objects of a common base class.

• Function overloading enables multiple functions with the same name but different parameters.

• Virtual functions allow derived classes to override base class functions.