20+ Hitesh Interview Questions and Answers

The T-s, p-v, h-s diagrams are graphical representations of thermodynamic cycles used in vapor, gas, and refrigeration systems.

• T-s diagram shows the relationship between temperature and entropy

• p-v diagram shows the relationship between pressure and volume

• h-s diagram shows the relationship between enthalpy and entropy

• Vapor cycle includes processes like evaporation, compression, and condensation

• Gas cycle includes processes like compression, expansion, and heat transfer

• Refrigera...read more

The effectiveness equation in heat exchanger determines the efficiency of heat transfer.

• The effectiveness equation compares the actual heat transfer rate to the maximum possible heat transfer rate.

• It takes into account the inlet and outlet temperatures of both fluids and the heat capacity rates.

• The equation is commonly used in designing and optimizing heat exchangers.

• An example of the effectiveness equation is Q/Qmax = (T1-T2)/(T1-T2s), where Q is the actual heat transfer rat...read more

Instrument & electrical field involves designing, installing, and maintaining electrical and electronic systems and equipment.

• It includes working with various instruments such as sensors, transmitters, and controllers.

• Knowledge of electrical circuits, wiring, and power distribution is essential.

• Skills in programming and troubleshooting are also important.

• Examples of applications include control systems for manufacturing processes, power distribution systems, and instrumentati...read more

2-stroke engines have one power stroke per revolution, while 4-stroke engines have one power stroke every two revolutions.

• 2-stroke engines have a simpler design with fewer moving parts compared to 4-stroke engines.

• 2-stroke engines require a fuel-oil mixture for lubrication, while 4-stroke engines have a separate oil reservoir.

• 2-stroke engines are lighter and produce more power for their size, but are less fuel efficient than 4-stroke engines.

• Examples: 2-stroke engines are com...read more

To calculate optimum Reflux in a distillation column, one must consider the desired purity of the distillate and the efficiency of the column.

• Calculate the minimum reflux ratio required for the desired separation using the Fenske equation

• Consider the efficiency of the column and adjust the reflux ratio accordingly

• Perform iterative calculations to find the optimum reflux ratio that balances purity and energy consumption

The LMTD equation is used to calculate the temperature difference in heat exchangers.

• LMTD stands for Logarithmic Mean Temperature Difference.

• It is used to calculate the heat transfer rate in heat exchangers.

• The equation is: LMTD = (ΔT1 - ΔT2) / ln(ΔT1 / ΔT2)

• ΔT1 and ΔT2 are the temperature differences between the hot and cold fluids at the inlet and outlet.

• The LMTD equation assumes that the heat transfer coefficient is constant and that the fluids are well mixed.

• It is commonly...read more

Generators and motors work on the principle of electromagnetic induction.

• Generators convert mechanical energy into electrical energy through electromagnetic induction

• Motors convert electrical energy into mechanical energy through electromagnetic induction

• Both devices rely on the interaction between magnetic fields and conductors to function effectively

The Venturi orifice equation is used to calculate the flow rate of a fluid through a pipe.

• It relates the pressure difference between two points in a pipe to the flow rate of the fluid.

• It is commonly used in industries such as oil and gas, chemical, and water treatment.

• The equation takes into account the diameter of the pipe, the density of the fluid, and the pressure difference.

• It can be used to determine the efficiency of a fluid system and to optimize its performance.

Generation, transmission, and distribution system are the three main components of the electricity supply chain.

• Generation: Production of electricity from various sources like coal, natural gas, hydro, wind, solar, etc.

• Transmission: High voltage lines used to transport electricity over long distances from power plants to substations.

• Distribution: Low voltage lines that deliver electricity from substations to homes, businesses, and other end-users.

IC engines are internal combustion engines where fuel is burned internally, while EC engines are external combustion engines where fuel is burned externally.

• IC engines have combustion happening inside the engine, like in a car engine.

• EC engines have combustion happening outside the engine, like in a steam engine.

• IC engines are more common in vehicles, while EC engines are used in power plants.

• IC engines are more efficient in terms of power output, while EC engines are more ef...read more

The question is unclear and does not make sense.

• The question needs to be rephrased or clarified.

• It is not clear what the interviewer is asking for.

Cavitations in pump is a phenomenon where air bubbles form in the liquid due to low pressure, causing damage to the pump.

• Occurs when the pressure in the pump drops below the vapor pressure of the liquid

• Can cause erosion, noise, and vibration in the pump

• Can be prevented by ensuring proper suction pressure and avoiding high-speed operation

• Examples include water pumps, fuel pumps, and hydraulic pumps

Transmission is in high voltage to reduce energy losses and increase efficiency.

• High voltage reduces energy losses during transmission

• Lower current at higher voltage leads to lower resistive losses

• Efficiency of transmission lines increases with higher voltage

• High voltage allows for long distance power transmission with minimal losses

Engineering is a field that involves the application of scientific and mathematical principles to design and create structures, machines, systems, and processes.

• Engineering encompasses various disciplines such as civil, mechanical, electrical, and chemical engineering.

• Engineers use their knowledge to solve complex problems and improve existing technologies.

• Examples of engineering projects include designing bridges, developing new medical devices, and creating sustainable ener...read more

Joule's law relates to the heat produced by a current passing through a resistor, while Newton's laws describe the relationship between an object's motion and the forces acting on it.

• Joule's law states that the heat produced by a current passing through a resistor is directly proportional to the square of the current and the resistance of the resistor. It can be expressed as Q = I^2 * R, where Q is the heat produced, I is the current, and R is the resistance.

• Newton's laws of ...read more

Gear terminology includes pitch, module, pressure angle, and types of gears include spur, helical, bevel, worm, etc.

• Gear terminology includes pitch, module, pressure angle, and tooth profile.

• Types of gears include spur, helical, bevel, worm, rack and pinion, etc.

• Spur gears have straight teeth and are used for parallel shafts.

• Helical gears have angled teeth for smoother operation.

• Bevel gears are used for intersecting shafts.

• Worm gears have a screw-like appearance and are used ...read more

Petrol engines use spark ignition while diesel engines use compression ignition.

• Petrol engines have higher RPMs and are more suitable for high-speed driving.

• Diesel engines have higher torque and are more fuel-efficient.

• Petrol engines are lighter and quieter than diesel engines.

• Diesel engines emit more pollutants than petrol engines.

• Examples of petrol engines include those found in sports cars while diesel engines are commonly used in trucks and buses.

The height of the wall behind me is approximately 8 feet.

• The wall is made of concrete blocks

• It is painted white

• There are no windows or decorations on the wall

• The wall is perpendicular to the ground

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

The annual income for the position of Diploma Trainee Engineer was not disclosed during the interview.

• Annual income was not mentioned during the interview

• Salary details may vary based on company, location, and other factors

RTD stands for Resistance Temperature Detector and PT1000 is a type of RTD with a resistance of 1000 ohms at 0°C.

• RTD is a temperature sensor that measures temperature by detecting changes in resistance of a metal wire as temperature changes.

• PT1000 is a type of RTD that has a resistance of 1000 ohms at 0°C and is commonly used in industrial applications.

• RTDs are more accurate than thermocouples and have a wider temperature range.

• RTDs are commonly used in industries such as foo...read more

Biology is the study of living organisms and their interactions with each other and their environment.

• Biology encompasses a wide range of topics, including genetics, ecology, physiology, and evolution.

• It seeks to understand the structure, function, behavior, and evolution of living things.

• Examples of biological processes include photosynthesis, cellular respiration, and DNA replication.

• Biology is important in fields such as medicine, agriculture, and conservation.

• It is a cons...read more

Boyle's law states that the pressure of a gas is inversely proportional to its volume at a constant temperature.

• Boyle's law can be mathematically expressed as P1V1 = P2V2, where P represents pressure and V represents volume.

• This law is based on the assumption that the temperature remains constant.

• As the volume of a gas decreases, its pressure increases, and vice versa.

• Boyle's law is commonly used in various fields such as chemistry, physics, and engineering.

TEMA types include BEM, AEM, NEN, and AES. Each type has specific design criteria and configurations.

• TEMA stands for Tubular Exchanger Manufacturers Association

• BEM (Bonnet, Expansion, and Shell), AEM (Bonnet, Expansion, and Shell), NEN (Fixed Tubesheet), and AES (Floating Tubesheet) are the main TEMA types

• Each TEMA type has specific design criteria and configurations for heat exchangers

• For example, BEM type is commonly used for high-pressure applications due to its robust des...read more