100+ Graduate Apprenticeship Trainee Interview Questions and Answers

To increase flow rate in a centrifugal pump, increase impeller speed, reduce discharge head, or increase impeller diameter.

• Increase impeller speed by adjusting motor speed or using a larger motor

• Reduce discharge head by opening valves or reducing pipe friction

• Increase impeller diameter by replacing impeller or using a pump with a larger impeller

• Ensure pump is properly primed and not clogged

• Consider the limitations of the pump and system design

My favorite chemical engineering subject is process design.

• I enjoy the challenge of designing efficient and cost-effective processes.

• I find it fascinating to optimize the use of resources and minimize waste.

• Examples of process design projects I have worked on include designing a distillation column for separating azeotropic mixtures and optimizing a chemical reaction for maximum yield.

Annuity at year start generally gives higher returns due to longer investment period and compounding interest.

• Annuity at year start gives higher returns due to longer investment period for compounding interest

• Investing at year start allows for more time for the investment to grow

• Annuity at year end may result in lower returns as the investment period is shorter

Questions related to fluid mechanics and cycles in I.C. Engine

• Viscosity is the measure of a fluid's resistance to flow

• Density is the measure of mass per unit volume of a substance

• Newton's law of viscosity states that the shear stress between adjacent fluid layers is directly proportional to the velocity gradient

• Surface tension is the force that causes the surface of a liquid to contract

• Cycles in I.C. Engine include intake, compression, power, and exhaust

• Diesel cycle has const...read more

To calculate no of trays in distillation column, use McCabe-Thiele method or Fenske equation.

• Determine the desired purity of the distillate

• Calculate the number of theoretical trays using McCabe-Thiele method or Fenske equation

• Account for efficiency and other factors to determine actual number of trays needed

A pump is a mechanical device used to move fluids from one place to another. It can be classified based on the purpose of application.

• Pumps are used to move fluids such as water, oil, and chemicals.

• Classification based on purpose includes centrifugal pumps for water supply, positive displacement pumps for oil and gas, and metering pumps for precise dosing.

• Other classifications include axial flow pumps, mixed flow pumps, and regenerative turbine pumps.

• Pumps can also be classif...read more

Yes, I would consider Kochi Refinery as an option for employment.

• I am open to exploring all options and would consider Kochi Refinery as a potential employer.

• I would research more about the company and its work culture before making a final decision.

• My ultimate goal is to gain valuable experience and contribute to the growth of the organization.

• I am willing to work hard and learn new skills to excel in my role at Kochi Refinery.

Acoustic Emission Testing is a non-destructive testing method that detects and analyzes high-frequency sound waves produced by materials under stress.

• AET is based on the principle that materials under stress emit high-frequency sound waves that can be detected and analyzed.

• It is used to detect and locate defects, cracks, and other anomalies in materials such as metals, composites, and concrete.

• AET is commonly used in industries such as aerospace, automotive, and civil enginee...read more

The motor speed is directly proportional to the number of poles and the frequency of the power supply.

• Motor speed is determined by the number of poles and the frequency of the power supply.

• The formula to calculate the motor speed is: Speed = (120 * Frequency) / Number of Poles.

• Higher frequency or more poles result in higher motor speed.

• Lower frequency or fewer poles result in lower motor speed.

Earthing and neutral are both important components of electrical systems, but they serve different purposes.

• Earthing is the process of connecting electrical equipment and installations to the earth to prevent electric shock and protect against electrical faults.

• Neutral is a current-carrying conductor that completes the circuit and provides a return path for the current back to the source.

• Earthing is primarily for safety purposes, while neutral is for the proper functioning of...read more

Distillation is a process of separating components of a mixture based on their boiling points.

• It involves heating the mixture to vaporize the component with the lowest boiling point.

• The vapor is then condensed and collected as a separate liquid.

• Types of distillation include simple distillation, fractional distillation, and steam distillation.

• Simple distillation is used for separating liquids with a large difference in boiling points.

• Fractional distillation is used for separat...read more

Questions related to engineering and college project

• Bearing is a machine element that supports a rotating shaft and reduces friction between moving parts

• Enthalpy is the amount of heat released or absorbed in a system at constant pressure, while entropy is the measure of disorder or randomness in a system

• Heat pump is a device that transfers heat from a colder area to a hotter area, while working on the principle of refrigeration cycle

• Heat pipe is a passive heat transfer device...read more

Water has a density of 1 g/cm³ and a boiling point of 100°C at standard atmospheric pressure. GAIL is a major gas company in India.

• Density of water: 1 g/cm³ at 4°C, which is its maximum density.

• Boiling point of water: 100°C (212°F) at 1 atm pressure.

• GAIL (Gas Authority of India Limited) was established in 1984.

• GAIL is involved in the transmission and distribution of natural gas.

• It plays a crucial role in India's energy sector and has expanded into petrochemicals.

Basic electrical components include resistors, capacitors, inductors, diodes, and transistors, essential for circuit design and functionality.

• Resistors: Limit current flow and divide voltages; e.g., used in LED circuits.

• Capacitors: Store and release electrical energy; e.g., used in power supply filters.

• Inductors: Store energy in a magnetic field; e.g., used in transformers.

• Diodes: Allow current to flow in one direction; e.g., used in rectifiers.

• Transistors: Act as switches or...read more

U1, V1, W1 denote phases in a three-phase system, ensuring correct electrical connections for motors and equipment.

• U1, V1, W1 represent the three phases in a three-phase electrical system.

• These labels help in identifying the correct connections for motors.

• For example, U1 is typically the first phase, V1 the second, and W1 the third.

• Using these designations prevents phase confusion, ensuring proper motor operation.

Speed and frequency in a motor are directly proportional to each other.

• Speed of a motor is directly proportional to the frequency of the power supply.

• Increasing the frequency of the power supply will increase the speed of the motor.

• Conversely, decreasing the frequency will decrease the speed of the motor.

• This relationship is important in controlling the speed of motors in various applications.

My favorite subjects in electrical engineering are power systems, control systems, and electronics.

• Power systems: I enjoy studying the generation, transmission, and distribution of electrical power.

• Control systems: I find the design and analysis of control systems fascinating.

• Electronics: I am interested in learning about electronic circuits and devices.

There are three laws of thermodynamics.

• There are three laws of thermodynamics: the zeroth law, the first law, and the second law.

• The zeroth law states that if two systems are in thermal equilibrium with a third system, they are in thermal equilibrium with each other.

• The first law states that energy cannot be created or destroyed, only transferred or converted.

• The second law states that the entropy of an isolated system will never decrease over time.

I have seen various types of engines in my college including diesel, petrol, and electric engines. I have also participated in practical classes where we disassembled and reassembled engines to understand their working principles.

• Diesel engines

• Petrol engines

• Electric engines

• Disassembling and reassembling engines

• Understanding working principles

Submerged Arc Welding is used for welding thick materials and in mass production of pipes, tanks, and vessels.

• Submerged Arc Welding is used for welding thick materials such as plates and pipes.

• It is commonly used in the mass production of pipes, tanks, and vessels.

• The welding process involves a continuous wire feed and a granular flux that shields the arc and weld pool from the atmosphere.

• The flux also helps to remove impurities from the weld and improve the quality of the we...read more

Supply Chain Management (SCM) systems coordinate production, shipment, and distribution of products to optimize efficiency.

• Planning: Involves demand forecasting and inventory management to ensure the right products are available.

• Sourcing: Selecting suppliers for raw materials, such as choosing a local farm for organic produce.

• Manufacturing: The process of converting raw materials into finished goods, like assembling cars in a factory.

• Logistics: Managing the transportation and...read more

EVs use electricity for power, while CNG vehicles run on compressed natural gas, differing in energy source and emissions.

• Energy Source: EVs are powered by electric batteries; CNG vehicles use compressed natural gas.

• Emissions: EVs produce zero tailpipe emissions; CNG vehicles emit lower pollutants than gasoline but still produce some.

• Refueling: EVs require charging stations; CNG vehicles can refuel at specialized gas stations.

• Range: EVs may have a limited range depending on b...read more

I am fully prepared to take on extra work during overtime to meet project deadlines and support team goals.

• I understand that sometimes projects require additional hours to ensure quality and timely delivery.

• For example, during my last internship, I volunteered for overtime to help complete a critical project ahead of schedule.

• I believe that putting in extra effort can lead to personal growth and team success.

• I am committed to the team's objectives and willing to adjust my sch...read more

Shear stress is the force applied parallel to a surface, causing deformation. Shear strain is the resulting deformation.

• Shear stress is the force applied parallel to a surface, causing deformation

• Shear strain is the resulting deformation in the material

• Shear stress is calculated as force divided by the area over which the force is applied

• Shear strain is calculated as the change in angle between two lines originally perpendicular in the material

IOT stands for Internet of Things, Cloud computing is a technology that allows access to data and applications over the internet, Flip-flops are digital circuits used in electronics.

• IOT (Internet of Things) refers to the network of physical devices connected to the internet, enabling them to collect and exchange data.

• Cloud computing involves storing and accessing data and programs over the internet instead of a computer's hard drive.

• Flip-flops are digital circuits used to sto...read more

A vacuum pump is operated by creating a vacuum in a closed system to remove air or gas molecules.

• The pump creates a low-pressure area in the system, causing air or gas to be drawn in and removed.

• There are different types of vacuum pumps, including rotary vane pumps, diaphragm pumps, and scroll pumps.

• The pump may be powered by electricity, compressed air, or a hand crank.

• Vacuum pumps are used in a variety of industries, including manufacturing, medical, and scientific research...read more

Criteria for feeding utility into heat exchangers

• Temperature of the utility should be appropriate for the desired heat transfer

• Flow rate of the utility should be sufficient to meet the heat transfer requirements

• Pressure of the utility should be compatible with the heat exchanger design

• Quality of the utility (e.g. cleanliness, corrosiveness) should be considered

• Type of utility (e.g. steam, water, oil) should match the heat exchanger specifications