10+ VVDN Technologies Interview Questions and Answers

Answering questions related to power plant engineering including boiler start-up and shutdown, emergencies, and 5S implementation.

• Boiler cold start-up involves purging the furnace, lighting the burner, and gradually increasing the temperature and pressure.

• Shutdown process involves cooling down the boiler, draining the water, and cleaning the furnace.

• Types of emergencies include boiler tube leaks, fires, explosions, and power outages.

• Specific energy consumption depends on the ...read more

I always prioritize safety when working at heights by following specific precautions.

• Wearing appropriate personal protective equipment (PPE) such as safety harnesses, helmets, and non-slip footwear

• Using fall protection systems like guardrails, safety nets, or lifelines

• Regularly inspecting and maintaining equipment like ladders, scaffolds, and platforms

• Ensuring proper training and certification for working at heights

• Implementing a buddy system or having a spotter to provide as...read more

5S system is a workplace organization method that aims to improve efficiency and productivity by eliminating waste and optimizing workflow.

• 5S stands for Sort, Set in Order, Shine, Standardize, and Sustain

• Sort involves removing unnecessary items from the workplace

• Set in Order involves organizing the remaining items in a logical and efficient manner

• Shine involves cleaning and maintaining the workplace

• Standardize involves creating and implementing standard procedures for maintai...read more

During a plant black out and island, I would prioritize safety, assess the situation, implement emergency protocols, and work to restore power.

• Prioritize safety of personnel and equipment

• Assess the situation to determine the cause of the blackout

• Implement emergency protocols to ensure stability of the plant

• Work to restore power by troubleshooting and fixing the issue

• Communicate with relevant stakeholders and authorities

Water parameters in feed water and steam path are crucial for efficient operation and maintenance of the system.

• Feed water parameters include pH level, conductivity, dissolved oxygen, and total dissolved solids.

• Steam path parameters include steam pressure, temperature, and quality.

• Maintaining proper water parameters is essential to prevent corrosion, scaling, and other issues in the system.

• Regular monitoring and testing of water parameters is necessary to ensure optimal perfo...read more

Severity is the impact of a bug on the system, while priority is the urgency of fixing it.

• Severity is the measure of how much a bug affects the system functionality.

• Priority is the importance of fixing a bug based on business needs.

• Example: A critical bug that crashes the system has high severity and high priority.

• Example: A cosmetic bug that doesn't affect functionality has low severity but high priority if it's a customer-facing issue.

Sort Set Shine Standardize Sustain are the 5S principles of workplace organization.

• Sort: Remove unnecessary items from the workplace.

• Set: Organize the remaining items in a logical manner.

• Shine: Clean and maintain the workplace regularly.

• Standardize: Establish procedures and standards for maintaining the workplace.

• Sustain: Continuously improve and sustain the 5S principles.

Fe 415 and 500 are different grades of steel used in construction.

• Fe 415 has a yield strength of 415 MPa, while Fe 500 has a yield strength of 500 MPa.

• Fe 415 is commonly used for residential construction, while Fe 500 is used for commercial and industrial structures.

• Fe 500 provides higher strength and durability compared to Fe 415.

• Fe 415 is more economical than Fe 500.

• Fe 415 is suitable for areas with low seismic activity, while Fe 500 is recommended for high seismic zones.

I have experience using mobile tools such as Android Studio, Xcode, and React Native for app development.

• Android Studio

• Xcode

• React Native

Provision is estimated based on past experience, current trends, and future expectations.

• Provision is an estimate of a liability or expense that may occur in the future.

• It is based on past experience, current trends, and future expectations.

• Provision can be estimated for various expenses such as bad debts, warranties, and legal claims.

• The estimation process involves analyzing historical data, market trends, and economic conditions.

• Provision is important for financial reportin...read more

AFBC Boiler stands for Atmospheric Fluidized Bed Combustion Boiler, which is a type of boiler that utilizes a bed of hot particles to burn fuel.

• Utilizes a bed of hot particles to burn fuel

• Operates at atmospheric pressure

• Suitable for fuels with low quality and high ash content

Boiler cold start up procedure involves several steps to ensure safe and efficient operation.

• Check water level in the boiler to ensure it is at the correct level

• Open the main steam valve and close the bypass valve

• Start the boiler feed water pump to fill the boiler with water

• Purge the air from the boiler by opening the air vent valves

• Turn on the boiler burner and ignite the fuel to start heating the water

• Monitor the boiler pressure and temperature to ensure they are within saf...read more

Transformers are devices that transfer electrical energy between two or more circuits through electromagnetic induction.

• Step-up transformer increases voltage levels (e.g. power distribution)

• Step-down transformer decreases voltage levels (e.g. household appliances)

• Auto transformer has a single winding with multiple taps for voltage adjustment

• Isolation transformer provides electrical isolation between input and output circuits

• Distribution transformer used in power distribution ...read more