Vocational Trainee Interview Questions and Answers

Steel and cast iron are both alloys of iron, but with different carbon content and properties.

• Steel is an alloy of iron and carbon, with a carbon content of less than 2%. It is stronger, more ductile, and more malleable than cast iron.

• Cast iron is an alloy of iron, carbon, and silicon, with a carbon content of 2-4%. It is more brittle and less malleable than steel.

• Steel is used in construction, machinery, and tools, while cast iron is used in pipes, engine blocks, and cookwar...read more

The thermal cycle used in power plants is the Rankine cycle.

• The Rankine cycle is a thermodynamic cycle used in power plants to convert heat into mechanical work.

• It consists of four main components: a boiler, a turbine, a condenser, and a pump.

• The cycle begins with the boiler where water is heated to produce high-pressure steam.

• The high-pressure steam then enters the turbine, where it expands and produces rotational energy.

• After passing through the turbine, the steam enters th...read more

Fluid mechanics is the study of fluids and their properties, including how they flow and interact with solid surfaces.

• Fluid mechanics deals with the behavior of liquids and gases in motion.

• Engines convert energy into mechanical work through combustion or other processes.

• Heat transmission involves the transfer of heat from one object to another.

• Understanding these concepts is crucial for the design and operation of machines and systems.

• Examples include the study of airflow in ...read more

The laws of thermodynamics describe the behavior of energy in a system. Entropy is a measure of the disorder or randomness in a system.

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

• The second law states that the total entropy of a closed system will always increase over time.

• The third law states that as temperature approaches absolute zero, the entropy of a system approaches a minimum.

• Entropy is a measure of the number of possi...read more

The Rankine cycle consists of four processes: compression, heat addition, expansion, and heat rejection.

• Compression: The working fluid is compressed from low pressure to high pressure.

• Heat Addition: High-pressure fluid is heated in a boiler to produce high-temperature, high-pressure steam.

• Expansion: The high-pressure steam expands through a turbine, converting thermal energy into mechanical work.

• Heat Rejection: The low-pressure steam is condensed back into liquid form in a co...read more

Sugar is extracted from sugarcane through a process involving crushing, boiling, filtering, and crystallizing.

• Sugarcane is harvested and taken to a sugar mill for processing

• The sugarcane is crushed to extract the juice

• The juice is then boiled to remove water and concentrate the sugar

• The concentrated juice is filtered to remove impurities

• The filtered juice is then crystallized to form sugar crystals

• The sugar crystals are dried and packaged for sale