10+ Damati Plastics Interview Questions and Answers

The stress-strain curve of cast iron shows a distinct yield point.

• Cast iron is a brittle material with a unique stress-strain behavior.

• The stress-strain curve of cast iron typically exhibits a sudden drop in stress after reaching the yield point.

• The yield point is the stress at which the material begins to deform plastically.

• After the yield point, cast iron shows limited ductility and tends to fracture.

• The yield point can be identified as the point where the stress-strain cur...read more

Axial compressors have a flow path parallel to the axis, while centrifugal compressors have a flow path perpendicular to the axis.

• Axial compressors have a higher flow rate and lower pressure ratio compared to centrifugal compressors.

• Axial compressors are used in applications where a large volume of air needs to be compressed, such as jet engines.

• Centrifugal compressors are used in applications where a higher pressure ratio is required, such as refrigeration systems.

• Axial comp...read more

My name is [Your Name]. I am a graduate from [Your College Name]. My final year project was [Brief Description of Final Year Project].

• Introduce yourself with your name and mention that you are a graduate engineer trainee.

• State the name of your college and the degree you obtained.

• Briefly describe your final year project, highlighting its significance and any notable achievements.

• Keep the introduction concise and engaging, focusing on relevant skills and experiences.

A shear force bending diagram of an overhanging beam shows the variation of shear force and bending moment along the length of the beam.

• Shear force is the force that acts perpendicular to the longitudinal axis of the beam.

• Bending moment is the moment that causes the beam to bend.

• In an overhanging beam, one end of the beam extends beyond its support.

• The shear force and bending moment diagram for an overhanging beam will have different characteristics compared to a simply suppo...read more

Air conditioning and refrigeration are both cooling systems, but differ in scale and purpose.

• Air conditioning is used to cool and dehumidify the air in a room or building.

• Refrigeration is used to cool and preserve perishable items, such as food and medicine.

• Air conditioning systems are typically smaller and focus on maintaining comfort levels for occupants.

• Refrigeration systems are larger and designed to maintain specific temperatures for storage or transportation.

• Air conditi...read more

A compressor is a mechanical device that increases the pressure of a gas by reducing its volume.

• Compressors are widely used in various industries, including manufacturing, oil and gas, and refrigeration.

• There are two main types of compressors: positive displacement compressors and dynamic compressors.

• Positive displacement compressors work by trapping a volume of gas and then reducing its volume to increase the pressure. Examples include reciprocating compressors and rotary sc...read more

Reheat factor is a measure of the efficiency of a gas turbine power plant.

• Reheat factor is the ratio of the actual work output of a gas turbine power plant to the work output if the same amount of heat is added at constant pressure.

• It indicates how effectively the heat is converted into useful work.

• A higher reheat factor indicates a more efficient power plant.

• Reheat factor can be calculated using the formula: Reheat Factor = (Work Output with Reheat) / (Work Output without Re...read more

The gas turbine works on the principle of converting the energy of a flowing gas into mechanical energy.

• Gas turbine operates on the Brayton cycle.

• Air is compressed in the compressor section.

• Compressed air is mixed with fuel and ignited in the combustion chamber.

• The hot gases expand through the turbine, driving the turbine blades.

• The turbine is connected to a shaft, which drives the compressor and other equipment.

• Exhaust gases are expelled from the turbine.

• Used in power genera...read more

The Joule cycle is a thermodynamic cycle that represents the operation of a heat engine.

• The Joule cycle consists of four processes: isentropic compression, constant volume heat addition, isentropic expansion, and constant volume heat rejection.

• It is often used to model the operation of gas turbines and internal combustion engines.

• The cycle assumes idealized conditions and serves as a theoretical framework for analyzing engine performance.

• The efficiency of the Joule cycle is d...read more

Cutoff ratio is the ratio of the cylinder volume at the end of the compression stroke to the clearance volume.

• Cutoff ratio is an important parameter in internal combustion engines.

• It determines the compression ratio and affects the engine's efficiency and power output.

• A higher cutoff ratio leads to a higher compression ratio, resulting in better combustion and increased efficiency.

• Cutoff ratio can be calculated by dividing the total cylinder volume at the end of the compressi...read more

Pressure ratio is the ratio of the outlet pressure to the inlet pressure in a fluid system.

• Pressure ratio is a measure of the change in pressure across a system.

• It is calculated by dividing the outlet pressure by the inlet pressure.

• Pressure ratio is commonly used in engineering applications, such as in compressors and turbines.

• A high pressure ratio indicates a significant increase in pressure, while a low pressure ratio indicates a minimal change.

• For example, in a gas turbine...read more