Parexel International Interview Questions and Answers

Drawing is a freehand representation of an object, while drafting involves using tools and instruments to create precise technical drawings.

• Drawing is typically done by hand, using pencils, pens, or other artistic tools.

• Drafting involves using tools like T-squares, triangles, and drafting machines to create accurate technical drawings.

• Drawings are often more artistic and expressive, while drafts are more technical and precise.

• Examples of drawings include sketches, paintings, ...read more

Two stroke engine completes a power cycle in one revolution of the crankshaft while four stroke engine completes it in two revolutions.

• Two stroke engine has no valves and uses ports to let in air and fuel mixture and expel exhaust gases.

• Four stroke engine has separate intake, compression, power, and exhaust strokes.

• Two stroke engine is simpler and lighter but less efficient and more polluting than four stroke engine.

• Examples of two stroke engines are chainsaws, mopeds, and ou...read more

Lubrication reduces friction and wear between two surfaces in contact with each other.

• Reduces friction and wear between two surfaces

• Prevents overheating and damage to the machinery

• Improves efficiency and performance of the machinery

• Types of lubricants include oil, grease, and dry lubricants

• Lubrication systems include splash, pressure, and circulating systems

A mechanical engineer is a professional who designs, develops, and tests mechanical systems and devices.

• Designing and analyzing mechanical systems

• Developing prototypes and testing them for functionality

• Collaborating with other engineers and professionals to ensure project success

• Applying principles of physics and materials science to solve engineering problems

Heating process is the method of increasing the temperature of a substance using external energy sources.

• Heating process involves transferring energy to a material to raise its temperature.

• Common methods of heating include conduction, convection, and radiation.

• Examples include heating water on a stove, using a microwave to heat food, and using a furnace to heat a room.

Stress is the force applied to a material, while strain is the resulting deformation or change in shape.

• Stress is a measure of the internal forces within a material, typically caused by external loads.

• Strain is the measure of how much a material deforms or changes shape in response to stress.

• Stress is usually expressed in units of force per unit area (such as N/m^2 or Pa), while strain is dimensionless.

• Stress can be tensile (stretching) or compressive (squeezing), leading to ...read more

Design in mechanical engineering involves creating and developing products, machines, systems, or structures to meet specific requirements.

• Designing involves conceptualizing, planning, and creating blueprints for mechanical components or systems.

• Considerations include functionality, efficiency, safety, cost, and aesthetics.

• Designers use software like CAD (Computer-Aided Design) to create detailed models and simulations.

• Prototyping and testing are essential steps in the design...read more