700+ Engineer Trainee Interview Questions and Answers

Free air delivery is the volume of compressed air delivered by a compressor at a given pressure and temperature.

• It is the actual amount of air delivered by a compressor to the system

• It is measured in cubic feet per minute (CFM)

• It takes into account the pressure and temperature of the compressed air

• It is affected by factors such as compressor size, speed, and efficiency

• It is important to consider when selecting a compressor for a specific application

1st and 3rd angle projection are two different methods used in technical drawing to represent 3D objects on 2D surfaces.

• 1st angle projection is commonly used in Europe and Asia, where the object is placed in the first quadrant (between the plane of projection and the observer).

• 3rd angle projection is commonly used in North America, where the object is placed in the third quadrant (behind the plane of projection).

• In 1st angle projection, the top view is placed below the front ...read more

Quality refers to the degree of excellence or superiority of a product or service.

• Quality is a measure of how well a product or service meets customer expectations and requirements.

• It involves ensuring that the product or service is free from defects or errors.

• Quality can be achieved through various processes such as quality control and quality assurance.

• Continuous improvement is essential for maintaining and enhancing quality.

• Examples of quality measures include reliability,...read more

Various tests are performed on transformers to ensure their proper functioning and safety.

• Insulation resistance test

• Turns ratio test

• Winding resistance test

• Short circuit test

• Open circuit test

• Impulse test

• Temperature rise test

• Dielectric strength test

• Partial discharge test

AC in battery will cause damage, unit of R,L,C is ohm, henry, farad, RLC circuit is a combination of resistor, inductor, capacitor, Transformer is a device that transfers electrical energy between two or more circuits.

• Applying AC in battery will cause damage due to mismatch in voltage requirements

• Unit of resistance (R) is ohm, inductance (L) is henry, capacitance (C) is farad

• RLC circuit is a combination of resistor, inductor, and capacitor used in electrical circuits

• Transform...read more

Iterate through the array and return the index of the first occurrence of 1.

• Iterate through the array using a loop.

• Check each element of the array, if it is 1 then return its index.

• If no 1 is found, return -1.

Manufacturing is the process of converting raw materials into finished products through various methods.

• Types of manufacturing include discrete manufacturing, process manufacturing, and job shop manufacturing.

• Discrete manufacturing involves the production of distinct items such as cars or computers.

• Process manufacturing involves the production of goods that are produced in bulk such as chemicals or food products.

• Job shop manufacturing involves the production of custom-made pr...read more

Arduino is an open-source electronics platform based on easy-to-use hardware and software.

• Arduino is a microcontroller board used for building digital devices and interactive objects.

• It is programmed using the Arduino software, which is based on C++ programming language.

• Power can be distributed to Arduino through USB, battery, or external power supply.

• Arduino has multiple input and output pins that can be used to connect sensors, actuators, and other electronic components.

Casting is a manufacturing process in which a liquid material is poured into a mold and allowed to solidify.

• The liquid material can be metal, plastic, or ceramic.

• The mold is usually made of sand, plaster, or metal.

• The solidified material is then removed from the mold and finished.

• Casting is used to create complex shapes that would be difficult or impossible to make using other manufacturing processes.

• Examples of cast products include engine blocks, jewelry, and dental crowns.

Stack is a linear data structure while tree is a hierarchical data structure.

• Stack is a collection of elements with LIFO (Last In First Out) order.

• Tree is a collection of nodes with parent-child relationship.

• Stack has only one entry and exit point while tree can have multiple entry and exit points.

• Stack is used for backtracking, undo operations, etc. while tree is used for representing hierarchical data like file systems, organization charts, etc.

Formula to calculate weight of steel based on diameter

• Formula: (dia. x dia.) ÷ 162

• dia. refers to the diameter of the steel

• 162 is a constant used in the formula

• The result will be in kg/metre

• Example: For a steel with diameter of 10mm, weight would be (10 x 10) ÷ 162 = 0.617 kg/metre

The questions are related to concrete engineering.

• Grade of concrete refers to the strength of the concrete mix, which is determined by the ratio of cement, sand, and aggregate.

• Cover for reinforcement is the thickness of concrete covering the reinforcement bars to protect them from corrosion.

• Density of material is the mass per unit volume of the material, which is important in determining the weight and strength of the structure.

• Concrete mix design involves determining the pro...read more

1st angle and 3rd angle of projection are two methods used in engineering drawing to represent a 3D object on a 2D plane.

• 1st angle projection: Used in Europe and Asia, where the object is placed in the first quadrant and the planes of projection are behind the object.

• 3rd angle projection: Used in North America, where the object is placed in the third quadrant and the planes of projection are in front of the object.

• The symbol for 1st angle projection is a right angle with a do...read more

OIL is a fossil fuel formed from the remains of ancient plants and animals. It is a major source of energy and used in various industries.

• OIL is a hydrocarbon-based liquid

• It is formed over millions of years from the remains of plants and animals

• It is extracted from underground reservoirs through drilling

• OIL is a non-renewable resource

• It is used as a fuel for transportation, heating, and electricity generation

• OIL is also used as a raw material in the production of plastics, ch...read more

QA focuses on preventing defects while QC focuses on identifying and correcting defects.

• QA involves the process of ensuring that the product meets the specified requirements and standards.

• QC involves the process of identifying defects in the product and correcting them.

• QA is a proactive approach while QC is a reactive approach.

• QA is a preventive measure while QC is a corrective measure.

• Example of QA: Reviewing requirements, creating test plans, and conducting code reviews.

• Exa...read more

Main products in the distillation column are separated based on their boiling points.

• The main products in a distillation column are separated based on their boiling points.

• The product with the lowest boiling point will be collected at the top of the column, while the product with the highest boiling point will be collected at the bottom.

• For example, in an oil refinery, crude oil is separated into various products such as gasoline, diesel, and jet fuel in a distillation column...read more

4-20mA signal is a standard current loop used in industrial control systems.

• 4-20mA signal is commonly used for transmitting analog signals in industrial automation.

• The signal range of 4-20mA allows for easy detection of faults in the system.

• It is a robust and reliable method of signal transmission, less susceptible to noise compared to voltage signals.

• Devices like sensors, transmitters, and controllers in industrial settings often use 4-20mA signal.

• 4mA represents the lowest v...read more

Structure languages focus on procedures and functions, while object-oriented languages focus on objects and classes.

• Structure languages use functions and procedures to manipulate data

• Object-oriented languages use objects and classes to encapsulate data and behavior

• Structure languages are more procedural in nature, while object-oriented languages are more modular and reusable

• Examples of structure languages include C and Pascal

• Examples of object-oriented languages include Java ...read more

OOPS concepts are fundamental to object-oriented programming and include inheritance, encapsulation, polymorphism, and abstraction.

• Inheritance: A child class inherits properties and behaviors from a parent class. Example: Animal class can be a parent class with child classes like Dog and Cat inheriting its attributes.

• Encapsulation: Bundling data and methods that operate on the data into a single unit. Example: A car object encapsulates data like speed and methods like acceler...read more

The system architecture diagram for a web application project visually represents the components and their interactions.

• Include components like client-side interface, server-side application, database, and external services

• Show how these components communicate with each other

• Consider scalability, security, and performance in the design

• Use standard symbols and notations for clarity

Quality testing process is a systematic approach to ensure that a product or service meets specified requirements and standards.

• Quality testing involves planning, designing, executing, and evaluating tests to identify defects or issues in a product or service.

• It includes activities like test case creation, test execution, defect tracking, and reporting.

• Quality testing can be manual or automated, depending on the complexity and requirements of the product or service.

• It aims to...read more

The first law states that energy cannot be created or destroyed, only transferred or converted. The second law states that the total entropy of a closed system will always increase over time.

• First law: Conservation of energy

• Second law: Entropy always increases

• Energy cannot be created or destroyed, only transferred or converted

• Entropy is a measure of disorder or randomness

• Examples: heat transfer, combustion, refrigeration

A gear is a mechanical device that transmits rotational motion and power between two or more rotating shafts.

• Gears are used in various machines and mechanisms to change the speed, torque, and direction of rotation.

• They consist of toothed wheels that mesh together to transmit power.

• Different types of gears include spur gears, helical gears, bevel gears, worm gears, etc.

• Spur gears are the most common type, with straight teeth parallel to the gear axis.

• Helical gears have angled ...read more

To manage under processing for team members, provide clear instructions, set realistic goals, offer support and resources, monitor progress, and provide feedback.

• Provide clear instructions on tasks and expectations

• Set realistic goals and deadlines

• Offer support and resources to help team members succeed

• Monitor progress regularly to identify any issues or delays

• Provide constructive feedback to help improve performance

Steel connections include bolted, welded, and riveted connections. RCC foundations can be shallow, deep, or pile foundations. Lacing and battening are used in steel structures for bracing. Flat slabs are a type of RCC slab without beams.

• Types of steel connections: bolted, welded, riveted

• Types of RCC foundations: shallow, deep, pile

• Lacing and battening used for bracing in steel structures

• Flat slabs are RCC slabs without beams

Answering questions related to system shutdown and clock-rate

• If the system is not responding, try to force shutdown by pressing and holding the power button

• Check the power supply and cables to ensure they are properly connected

• Basic clock-rate is the speed at which a processor executes instructions, measured in GHz

• Higher clock-rate means faster processing but also higher power consumption and heat generation

Various types of joints used in automobiles include universal joints, constant velocity joints, and ball joints.

• Universal joints allow for movement in multiple directions, commonly used in driveshafts.

• Constant velocity joints maintain constant speed regardless of the angle, found in front-wheel drive vehicles.

• Ball joints connect control arms to steering knuckles, enabling smooth movement and steering.

• Other types include slip joints, bushings, and tie rod ends.

Java program to print first 5 letters of a name

• Create a String variable with your name

• Use substring method to extract first 5 characters

• Print the extracted substring

Program to check if a number is odd and to find a digit in the number.

• Use modulo operator to check if a number is odd (number % 2 == 1)

• Convert the number to a string and check if the digit is present using string methods

• Handle edge cases like negative numbers and non-integer inputs

A layout diagram of a press machine

• Start by drawing the overall shape of the press machine

• Include the main components such as the frame, bed, ram, and bolster

• Label the different parts and their functions, such as the clutch, flywheel, and control panel

• Indicate the direction of material flow and the path of the press operation

• Consider the safety features and emergency stop buttons

• Use standard symbols and annotations for clarity

• Add dimensions and scale if necessary

Water treatment involves several steps to remove impurities and make it safe for consumption.

• Coagulation and Flocculation

• Sedimentation

• Filtration

• Disinfection

• Storage

• Distribution

Join and Union are SQL operations used to combine data from two or more tables.

• Join combines columns from two or more tables based on a related column

• Union combines rows from two or more tables into a single result set

• Join types include Inner, Left, Right, and Full Outer

• Union removes duplicate rows by default

Lean manufacturing is a systematic approach to minimize waste and maximize efficiency in production processes.

• Focuses on continuous improvement

• Eliminates non-value adding activities

• Involves all employees in the process

• Reduces lead time and inventory

• Examples include Toyota Production System and Kaizen

Voltage is the electric potential difference between two points in a circuit.

• Voltage is measured in volts (V).

• It is the force that drives electric current through a circuit.

• Higher voltage means more energy is available to move electrons.

• Voltage can be stepped up or down using transformers.

• Example: A battery has a voltage of 1.5V.

• Example: The voltage in a power outlet is typically 120V in the US.

• Example: High voltage power lines can have voltages up to 765kV.

Operations on a press machine include cutting, bending, shaping, and forming materials.

• Cutting: Press machines can be used to cut materials such as metal sheets or paper.

• Bending: Press machines can bend materials into desired shapes or angles.

• Shaping: Press machines can shape materials by applying pressure or force.

• Forming: Press machines can be used for forming processes like deep drawing or stamping.

• Examples: Press machines are commonly used in industries like automotive, m...read more

Explanation of a class in Java using a fruit class example

• A class in Java is a blueprint for creating objects. It defines the properties and behaviors of objects.

• In the case of a fruit class, properties could include name, color, and taste, while behaviors could include methods like ripen() and rot().

• Example: class Fruit { String name; String color; String taste; void ripen() { //code to ripen fruit } void rot() { //code to rot fruit }}

A Java program to check if a given string is a palindrome.

• Create a function that takes a string as input.

• Use two pointers, one starting from the beginning and one from the end, to compare characters.

• If all characters match, the string is a palindrome.

• Example: 'racecar' is a palindrome, 'hello' is not.

Different types of compressors include reciprocating, rotary screw, centrifugal, and scroll compressors.

• Reciprocating compressors use pistons to compress air.

• Rotary screw compressors use two rotating screws to compress air.

• Centrifugal compressors use a rotating impeller to compress air.

• Scroll compressors use two interleaving scrolls to compress air.

• Examples: Ingersoll Rand reciprocating compressor, Atlas Copco rotary screw compressor, Centac centrifugal compressor, Copeland s...read more

5S is a workplace organization method that aims to improve efficiency and productivity by eliminating waste and optimizing workflow.

• Sort - separate necessary items from unnecessary ones

• Set in order - arrange necessary items in a logical and efficient manner

• Shine - clean and inspect the work area regularly

• Standardize - establish procedures and guidelines for maintaining the 5S system

• Sustain - ensure that the 5S system is continuously implemented and improved upon

• Example: organ...read more

A pipe is measured by its inner diameter, while a tube is measured by its outer diameter.

• Pipe is used to transport fluids or gases, while tubes are used for structural applications.

• Pipes are typically round in shape, while tubes can be round, square, or rectangular.

• Pipes are manufactured to specific industry standards, while tubes can have varying thicknesses and tolerances.

Hardware components of a computer system include CPU, RAM, motherboard, storage devices, and peripherals. Latest technologies include SSDs, GPUs, and advanced cooling systems.

• CPU (Central Processing Unit) - processes instructions and performs calculations

• RAM (Random Access Memory) - stores data and instructions temporarily for the CPU to access quickly

• Motherboard - connects all components together and allows communication between them

• Storage devices (e.g. SSDs, HDDs) - store ...read more

To find negative numbers in an array and move them forward

• Loop through the array and check if each element is negative

• If it is negative, move it to the front of the array

• Use two pointers to keep track of the negative and positive numbers

A good working environment is one that promotes collaboration, open communication, respect, and a positive attitude.

• Collaborative team atmosphere

• Open communication between team members and management

• Respectful and supportive interactions

• Positive attitude and motivation

• Comfortable and well-equipped workspace

I install the Windows operating system on my PC.

• I prefer using Windows as it is user-friendly and widely compatible with software and hardware.

• Windows provides a familiar interface and a wide range of software options.

• It offers regular updates and support from Microsoft.

• Examples: Windows 10, Windows 8.1, Windows 7.

Primary key uniquely identifies a record while foreign key establishes a link between two tables.

• Primary key is a column or set of columns that uniquely identifies each record in a table.

• Foreign key is a column or set of columns in one table that refers to the primary key in another table.

• Primary key cannot have null values while foreign key can have null values.

• Primary key is used to create relationships between tables while foreign key is used to maintain referential integr...read more

The number of bricks in 1 cubic meter varies depending on the size of the bricks.

• The size of the bricks affects the number of bricks in 1 cubic meter.

• Different brick sizes result in different brick quantities.

• To determine the number of bricks, we need to know the dimensions of the bricks.

Basic commands in MATLAB include help, clear, clc, close all, and quit.

• help - displays help information for a specific command or function

• clear - clears all variables from the workspace

• clc - clears the command window

• close all - closes all open figures

• quit - exits MATLAB

• Example: help plot

• Example: clear

• Example: clc

• Example: close all

• Example: quit