800+ Engineer Trainee Interview Questions and Answers

The question is about finding the total number of handshakes in a meeting of 10 people.

• Each person shakes hands with 9 others.

• Total handshakes = 10 x 9 / 2 = 45.

The minimum number of socks to be picked to obtain at least 1 rightly colored pair is 3.

• Pick 2 socks of different colors first, then the next sock picked will definitely match one of the colors already picked.

• In the worst case scenario, the first 2 socks picked will be of different colors.

• Therefore, the minimum number of socks to be picked is 3.

Armstrong number is a number whose sum of cubes of its digits is equal to the number itself.

• Armstrong number is also known as Narcissistic number.

• For example, 153 is an Armstrong number because 1^3 + 5^3 + 3^3 = 153.

• The coding logic involves breaking down the number into its individual digits, cubing them, and then adding them up.

• Finally, the sum is compared with the original number to determine if it is an Armstrong number or not.

Shear force and bending moment diagrams show the variation of forces and moments along a beam subjected to different loads.

• Shear force diagram represents the variation of shear force along the length of the beam.

• Bending moment diagram represents the variation of bending moment along the length of the beam.

• Different loads such as point loads, distributed loads, and moments can be combined to create a composite load on the beam.

• To draw the shear force diagram, calculate the rea...read more

Strings are immutable sequences of characters while lists are mutable sequences of objects.

• Strings are enclosed in quotes while lists are enclosed in square brackets.

• Strings cannot be modified while lists can be modified using various methods.

• Strings are used to represent text while lists are used to store collections of objects.

• Strings have limited functionality compared to lists which have a wide range of methods and operations.

• Example of string: 'Hello World', Example of l...read more

Questions related to stress-strain curve, modulus, elasticity, strain, hardness, and toughness.

• Stress-strain curve shows the relationship between stress and strain in a material.

• Young's modulus measures the stiffness of a material under tension or compression.

• Bulk modulus measures the resistance of a material to uniform compression.

• Elasticity is the ability of a material to return to its original shape after deformation.

• Strain is the measure of deformation in a material and i...read more

A technical interview for Engineer Trainee covering topics such as CMOS, latch, flip flops, MOSFET, and dynamic memory.

• CMOS stands for Complementary Metal-Oxide-Semiconductor and is a type of technology used in microprocessors and digital logic circuits.

• A latch is a type of digital circuit that can store one bit of information.

• The main difference between a latch and a flip flop is that a flip flop has a clock input and can store information for a longer period of time.

• To make...read more

Sensors and actuators are essential components in engineering. Pneumatics is a branch of engineering that deals with gas or air-powered systems.

• Sensors are devices that detect and measure physical properties such as temperature, pressure, and light. Examples include thermocouples, pressure sensors, and photoelectric sensors.

• Actuators are devices that convert energy into motion. Examples include motors, solenoids, and hydraulic cylinders.

• Pneumatics is a branch of engineering t...read more

Different grades of steel have varying yield stress. Learn about them here.

• The most common grades of steel are A36, A572, and A992.

• A36 steel has a yield strength of 36,000 psi.

• A572 steel has a yield strength of 42,000-65,000 psi depending on the grade.

• A992 steel has a yield strength of 50,000-65,000 psi depending on the grade.

• Higher grades of steel generally have higher yield strengths.

Balancing personal and professional commitments is crucial; prioritizing based on urgency and impact is key.

• Evaluate the urgency of the family function; if it's a once-in-a-lifetime event, it may take precedence.

• Consider the company's current situation; if my absence could significantly harm the team, I might choose to stay.

• Communicate with my supervisor about the situation; transparency can lead to understanding and possible solutions.

• If possible, I could attend the function...read more

LMTD is Logarithmic Mean Temperature Difference. Efficiency of heat exchanger can be calculated using LMTD.

• LMTD is the average temperature difference between the hot and cold fluids in a heat exchanger.

• LMTD is used to calculate the heat transfer rate in a heat exchanger.

• Efficiency of heat exchanger can be calculated using LMTD and heat capacity rate.

• Formula for LMTD is (ΔT1 - ΔT2) / ln(ΔT1 / ΔT2)

• Formula for efficiency is (Actual heat transfer rate / Maximum possible heat tran...read more

Capillary action is the ability of a liquid to flow in narrow spaces without the assistance of, or even in opposition to, external forces like gravity.

• Capillary action occurs due to the combination of adhesive forces between the liquid and the surface it is in contact with, and cohesive forces between the liquid molecules.

• Surface tension is the tendency of a liquid surface to minimize its surface area, caused by the cohesive forces between the liquid molecules.

• Wetting is the ...read more

A left join retrieves all records from the left table and matched records from the right table.

• Use the LEFT JOIN keyword to combine rows from two tables based on a related column.

• Syntax: SELECT columns FROM table1 LEFT JOIN table2 ON table1.column = table2.column;

• Example: SELECT a.id, a.name, b.salary FROM employees a LEFT JOIN salaries b ON a.id = b.emp_id;

• If there is no match, NULL values will be returned for columns from the right table.

Fluid is a substance that flows and takes the shape of its container. Bernoulli's Equation relates pressure, velocity, and elevation in a fluid flow.

• Fluid is a substance that deforms continuously under an applied shear stress, no matter how small.

• Bernoulli's Equation: P + 1/2ρv^2 + ρgh = constant, where P is pressure, ρ is density, v is velocity, and h is height.

• Pressure term (P): Represents the internal energy per unit volume due to molecular collisions.

• Kinetic energy term (...read more

Java is a high-level programming language used for developing applications and software.

• Java is an object-oriented language

• It is platform-independent

• Java has automatic garbage collection

• Java supports multithreading

• Java has various built-in classes and libraries

• Java has four basic OOP concepts: encapsulation, inheritance, abstraction, and polymorphism

• Java has three types of loops: for, while, and do-while

• Java has conditional statements like if, if-else, and switch

Program to swap value of two variables without using a third variable.

• Use arithmetic operations to swap values

• Add both variables and store the sum in one variable

• Subtract the value of one variable from the sum and store it in the other variable

• Subtract the value of the other variable from the sum and store it in the first variable

The water cement ratio is affected by the addition of admixture.

• The water cement ratio is the ratio of the weight of water to the weight of cement in a concrete mix.

• When an admixture is added, it can change the properties of the concrete mix, including the water cement ratio.

• Some admixtures, such as water-reducing admixtures, can decrease the water cement ratio by allowing for a lower water content while maintaining workability.

• Other admixtures, such as plasticizers, can incr...read more

Different operations on a lathe machine include turning, facing, drilling, boring, threading, and tapering.

• Turning: Removing material from the outer diameter of a workpiece to create a cylindrical shape.

• Facing: Cutting the end of a workpiece to create a flat surface.

• Drilling: Creating holes in the workpiece using a drill bit.

• Boring: Enlarging existing holes or creating larger cylindrical holes.

• Threading: Cutting threads on the surface of a workpiece to create a screw-like sha...read more

My final year project was on logistic regression.

• Logistic regression is a statistical model used to predict binary outcomes.

• It is a type of regression analysis where the dependent variable is categorical.

• The model estimates the probability of the outcome based on the input variables.

• It uses a logistic function to map the predicted values to probabilities.

• The model is commonly used in various fields like finance, marketing, and healthcare.

• For example, logistic regression can b...read more

Use a loop to iterate through the array and keep track of the maximum and second-maximum numbers.

• Initialize two variables to store the maximum and second-maximum numbers.

• Iterate through the array and update the variables accordingly.

• Handle edge cases like when the array has less than two elements.

Crowning of pulleys is the process of shaping the pulley's surface to a slight convex curve. Belt drives have advantages over gear drives.

• Crowning of pulleys helps in maintaining proper belt alignment and prevents belt slippage.

• It also helps in distributing the load evenly across the belt.

• Belt drives are quieter, smoother, and require less maintenance than gear drives.

• They also allow for more flexibility in terms of distance between shafts and can absorb shock and vibration.

• H...read more

Pass-by-value is a method of passing arguments to a function where the actual value of the argument is copied to a new variable.

• In pass-by-value, a copy of the actual value of the argument is passed to the function.

• Any changes made to the parameter inside the function do not affect the original value outside the function.

• Primitive data types like integers, floats, and characters are typically passed by value.

• Example: int x = 10; foo(x); // the value of x (10) is copied to a n...read more

Cloud computing is a network of remote servers hosted on the internet to store, manage, and process data, while grid computing is a distributed computing model that relies on a network of computers to work together on a task.

• Cloud computing provides on-demand access to a shared pool of configurable computing resources, while grid computing involves the coordination of disparate resources to solve a complex problem.

• In cloud computing, resources are typically virtualized and sc...read more

The angle of projection that is important for critical jobs is the isometric projection.

• Isometric projection is important for critical jobs as it provides a three-dimensional view of the object.

• It allows for accurate measurements and analysis of the object's dimensions and angles.

• Other types of projections, such as orthographic projection, may not provide enough detail for critical jobs.

• For example, in engineering, isometric projection is often used for designing complex mach...read more

Bubble Sort is a simple sorting algorithm that repeatedly steps through the list, compares adjacent elements, and swaps them if needed.

• 1. Bubble Sort works by repeatedly comparing adjacent elements in an array.

• 2. If the first element is greater than the second, they are swapped.

• 3. This process is repeated for each pair of adjacent elements until the entire array is sorted.

• 4. The algorithm gets its name because smaller elements 'bubble' to the top of the array.

• 5. Example: For ...read more

Work is the amount of energy transferred when a force is applied over a distance. Power is the rate at which work is done.

• Work is the product of force and distance

• Power is the rate at which work is done

• Energy is the capacity to do work

• Weight is the force exerted on an object due to gravity

• Mass is the amount of matter in an object

• Unit of weight is Newtons (N)

Gear manufacturing processes include honing, lapping, etc. Annealing, tempering, and quenching are heat treatment processes.

• Honing and lapping are finishing processes used to improve the surface finish of gears.

• Annealing is a heat treatment process that involves heating the metal to a specific temperature and then cooling it slowly to make it softer and more ductile.

• Tempering is a heat treatment process that involves heating the metal to a specific temperature and then coolin...read more