10+ Deccan Enterprises Interview Questions and Answers

Questions on Buchholz relay, relay, sensor, electrical drawing, DOL starter, and reverse forward starter for Junior Engineer position.

• Buchholz relay is a protective device used in oil-filled transformers and reactors.

• A relay is an electrically operated switch that opens or closes circuits.

• A sensor is a device that detects and responds to some type of input from the physical environment.

• Electrical drawings are technical diagrams that show information about power, lighting, and...read more

There are various types of welding such as MIG, TIG, Stick, and Flux-Cored. MIG welding is a popular type of welding.

• MIG welding uses a wire electrode and a shielding gas to join two metal pieces together.

• TIG welding uses a tungsten electrode and a filler metal to create a weld.

• Stick welding uses a consumable electrode coated in flux to create a weld.

• Flux-Cored welding uses a wire electrode with a flux core to create a weld.

• MIG welding is commonly used in automotive and manuf...read more

Metallurgy and process steps are crucial in steel production.

• Metallurgy involves the study of physical and chemical properties of metals.

• Process steps include melting, refining, casting, rolling, and finishing.

• Different types of steel require different metallurgical processes and process steps.

• Quality control is important to ensure the final product meets desired specifications.

Metallurgy is the study of metals and their properties, production, and purification.

• Metallurgy is important as it helps in understanding the behavior of metals, their properties, and how they can be used in various applications.

• Some common metal products include aluminum cans, copper wires, steel beams, and gold jewelry.

• Steel is an alloy of iron and carbon, known for its strength and versatility in construction and manufacturing.

• Iron has a melting point of 1538°C, while stee...read more

Corona effect in transmission lines is the phenomenon of ionization of air surrounding the conductors due to high voltage, leading to energy loss and audible noise.

• Corona effect occurs when the electric field strength around the conductor exceeds the breakdown strength of air, causing ionization of air molecules.

• This ionization results in loss of energy in the form of light, heat, and sound, leading to power loss and audible noise in the transmission line.

• Corona effect can be...read more

3 phase motors operate on the principle of electromagnetic induction to generate rotating magnetic fields.

• Three phase motors have three sets of windings spaced 120 degrees apart

• When current flows through the windings, it creates a rotating magnetic field

• The rotating magnetic field interacts with the rotor to produce motion

• Common types include induction motors and synchronous motors

Latent heat is the heat absorbed or released by a substance during a phase change without a change in temperature.

• Latent heat is the energy required to change the state of a substance without changing its temperature.

• It is the heat absorbed or released during a phase change.

• Latent heat is important in processes such as melting, freezing, vaporization, and condensation.

• Examples include the heat absorbed by ice to melt into water and the heat released by water vapor to condense...read more

Transmission lines are used to transmit electrical energy from one point to another efficiently.

• Transmission lines are used to carry electrical signals or power from a source to a load.

• They are designed to minimize losses and maintain signal integrity.

• Single line diagram represents the transmission line as a single line with symbols for components like transformers, circuit breakers, etc.

• Examples of transmission lines include overhead power lines and underground cables.

A thermal power plant diagram shows the process of generating electricity using heat energy.

• The diagram typically includes components such as boilers, turbines, generators, condensers, and cooling towers.

• Heat energy from burning fossil fuels or nuclear reactions is used to produce steam, which drives turbines to generate electricity.

• The steam is then condensed back into water and recycled in the system.

• Cooling towers are used to dissipate excess heat from the process.

• Example:...read more

A half bridge rectifier is a type of rectifier circuit that uses two diodes to convert alternating current (AC) to direct current (DC).

• Consists of two diodes connected in a configuration that allows current to flow in only one direction

• Used in applications where a full bridge rectifier is not necessary or practical

• Produces a pulsating DC output

• Commonly used in low power applications such as battery chargers and small power supplies

Contour points are points on a map that connect locations of equal elevation, while control points are reference points used for surveying and mapping.

• Contour points connect locations of equal elevation on a map.

• Control points are reference points used for surveying and mapping.

• Contour points help visualize the shape of the land, while control points ensure accuracy in measurements.

• Examples: Contour points on a topographic map, control points in a land survey.

Metallurgy is the study of physical and chemical behavior of metallic elements, their compounds, and alloys.

• Metallurgy involves studying the properties of metals and their applications in various industries.

• It includes processes like extraction of metals from ores, refining, alloying, and shaping.

• Metallurgical engineers work on developing new materials with improved properties for specific applications.

• Examples of metallurgical processes include heat treatment, welding, and c...read more

Archimedes' principle states that the buoyant force on an object is equal to the weight of the fluid displaced by the object.

• Buoyant force equals weight of fluid displaced

• Used to determine if an object will float or sink in a fluid

• Helps in understanding why objects feel lighter in water

A cooling tower is a heat rejection device that extracts waste heat to the atmosphere through the cooling of a water stream.

• Cooling towers are used in industrial processes to cool water or other fluids by evaporating a small portion of the water.

• They are commonly seen in power plants, refineries, petrochemical plants, and HVAC systems.

• Cooling towers can be classified into different types such as natural draft, mechanical draft, and hybrid cooling towers.

Strength of materials is a branch of engineering that deals with the behavior of solid objects subject to stresses and strains.

• Strength of materials involves studying how materials deform and break under various types of loads.

• It is important in designing structures and machines to ensure they can withstand the forces they will be subjected to.

• Common topics in strength of materials include stress, strain, elasticity, and material properties.

• Examples of applications include de...read more

Yes, I am able to work in hot conditions and have experience doing so.

• I have previous experience working in hot conditions, such as during summer construction projects.

• I am able to stay hydrated and take necessary breaks to prevent heat exhaustion.

• I am familiar with proper safety measures for working in hot conditions, such as wearing appropriate clothing and sunscreen.

• I am able to adapt to the heat and focus on the task at hand without being distracted.

Steel making is a fascinating process that involves transforming raw materials into a strong and versatile material used in various industries.

• Steel making allows for the production of a durable and versatile material used in construction, manufacturing, and infrastructure.

• The process involves combining iron ore with other elements to create different types of steel with varying properties.

• Steel making is essential for creating products like cars, buildings, bridges, and mach...read more

Blast furnaces are used in the production of iron and steel through the smelting process.

• Blast furnaces are essential for converting iron ore into molten iron, which can then be further processed into steel.

• They are able to operate continuously, making them efficient for large-scale production.

• The high temperatures inside a blast furnace allow for the removal of impurities from the iron ore, resulting in high-quality steel.

• Blast furnaces have been used for centuries and conti...read more