10+ Mechanical Graduate Engineer Trainee Interview Questions and Answers

No, it is not possible to convert a SI engine into a diesel engine.

• SI engines use spark ignition while diesel engines use compression ignition.

• The design and components of the two engines are different.

• Converting an SI engine into a diesel engine would require significant modifications and may not be feasible.

• It is more practical to simply replace the engine with a diesel engine.

There are three types of flow studied in fluid mechanics.

• Laminar flow

• Turbulent flow

• Transitional flow

Zeroth, first, and second laws of thermodynamics are fundamental principles in the study of energy and heat transfer.

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

• First law of thermodynamics, also known as the law of energy conservation, states that energy cannot be created or destroyed, only transferred or converted.

• Second law of thermodynamics states that the total entr...read more

Laws of thermodynamics, types of bearings, and types of gears are important concepts in mechanical engineering.

• Laws of thermodynamics include zeroth law, first law, second law, and third law.

• Types of bearings include ball bearings, roller bearings, plain bearings, and fluid bearings.

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

COP stands for Coefficient of Performance and Ton of refrigeration is a unit of power used in refrigeration.

• COP is a measure of the efficiency of a refrigeration system, calculated as the ratio of cooling output to the amount of energy input.

• Ton of refrigeration is a unit of power equal to 12,000 BTUs per hour, used to describe the cooling capacity of a refrigeration system.

• COP and Ton of refrigeration are important concepts in the design and operation of refrigeration system...read more

Antonyms and synonyms of words

• Antonyms of 'happy': sad, miserable, gloomy

• Synonyms of 'big': large, huge, massive

• Antonyms of 'fast': slow, sluggish, leisurely

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

• Spur gears have straight teeth and are the most common type.

• Helical gears have angled teeth for smoother operation.

• Bevel gears have cone-shaped teeth and are used to change the direction of rotation.

• Worm gears have a screw-like appearance and provide high gear reduction ratios.

• Rack and pinion gears convert rotational motion into linear motion.

• Planetary gears consist of a central gear (sun ...read more

Steady flow refers to the continuous flow of a fluid without any changes in its properties or characteristics.

• Steady flow occurs when the fluid properties such as velocity, pressure, and temperature remain constant at any given point in the flow field over time.

• In steady flow, the flow rate of the fluid remains constant.

• Examples of steady flow include the flow of water through a pipe with a constant pressure difference or the flow of air through a ventilation system.

An orifice is a small opening or hole through which fluid or gas can flow.

• Orifices are commonly used in various applications such as in pipes, nozzles, and valves.

• They are used to control the flow rate of fluids or gases.

• The size and shape of the orifice determine the flow characteristics.

• Orifices can be circular, rectangular, or any other shape depending on the application.

• Examples of orifices include the nozzle of a garden hose, the opening in a fuel injector, and the ventu...read more

Knocking is the unwanted sound produced in an internal combustion engine due to improper combustion of the air-fuel mixture.

• Knocking occurs when the air-fuel mixture ignites spontaneously before the spark plug fires.

• It can lead to engine damage if not addressed promptly.

• Knocking can be caused by factors such as low octane fuel, incorrect ignition timing, or carbon deposits in the combustion chamber.

WBT stands for Wet Bulb Temperature and DPT stands for Dew Point Temperature.

• Wet Bulb Temperature (WBT) is the temperature read by a thermometer covered in a water-soaked cloth exposed to moving air.

• Dew Point Temperature (DPT) is the temperature at which air becomes saturated with water vapor and dew forms.

• Both WBT and DPT are important in determining humidity levels and comfort in a given environment.

Types of heat transfer include conduction, convection, and radiation.

• Conduction: Heat transfer through direct contact between materials, such as a metal spoon heating up in a hot drink.

• Convection: Heat transfer through the movement of fluids, such as boiling water in a pot.

• Radiation: Heat transfer through electromagnetic waves, such as the sun warming the Earth.

Carbon is a key element in steel, affecting its strength, hardness, and other properties.

• Carbon content in steel typically ranges from 0.2% to 2.1%.

• Higher carbon content results in harder and stronger steel.

• Low carbon steel (0.05-0.30% carbon) is more ductile and easily weldable.

• High carbon steel (0.60-2.0% carbon) is more brittle and used for cutting tools.

• Carbon steel is widely used in construction, automotive, and manufacturing industries.

Stress-strain diagram shows the relationship between stress applied to a material and the resulting strain.

• It is a graphical representation of how a material deforms under stress.

• The diagram typically shows a linear elastic region, a yield point, plastic deformation, and ultimate failure.

• The slope of the linear region is the material's Young's Modulus.

• The area under the stress-strain curve represents the material's toughness.

• Different materials have different stress-strain cu...read more

Thermodynamics laws govern energy transfer and transformation in physical systems.

• First Law of Thermodynamics: Energy cannot be created or destroyed, only transferred or converted.

• Second Law of Thermodynamics: Entropy in a closed system will always increase over time.

• Third Law of Thermodynamics: As temperature approaches absolute zero, the entropy of a system approaches a minimum value.

• Examples: A car engine converting fuel into mechanical energy follows the laws of thermodyn...read more