10+ Dheerya Interview Questions and Answers

Types of sprinklers, fire, extinguisher classification, types and uses of pumps are important for a fire technician.

• Types of sprinklers include wet, dry, deluge, and pre-action

• Fire is a chemical reaction that produces heat, light, and smoke

• Extinguishers are classified by the type of fire they can put out (A, B, C, D, or K)

• Types of pumps include centrifugal, positive displacement, and vertical turbine

• Pumps are used for water supply, pressure maintenance, and fire protection sy...read more

Electrical current unit is measured in Amperes (A).

• Electrical current unit is the measure of the flow of electric charge.

• It is measured in Amperes (A) and is named after the French physicist Andre-Marie Ampere.

• One Ampere is defined as the amount of current that flows when one Coulomb of charge passes through a conductor in one second.

• Electrical current is the rate at which electric charge flows through a circuit.

• It is an essential concept in electrical engineering and is used...read more

Control diagrams for Star Delta and DOL starters are essential for understanding the operation of these motor starting methods.

• Control diagram for Star Delta starter involves two contactors and a timer for switching between star and delta connections.

• Control diagram for DOL starter includes a single contactor for direct starting of the motor.

• Both diagrams show the connections of the motor, contactors, overload relays, and power supply.

• Understanding these diagrams is crucial f...read more

AHU stands for Air Handling Unit. It is used in HVAC systems to regulate and circulate air in buildings.

• AHU stands for Air Handling Unit.

• It is a device used in HVAC (Heating, Ventilation, and Air Conditioning) systems.

• AHUs are responsible for regulating and circulating air in buildings.

• They help maintain indoor air quality and temperature.

• AHUs are commonly found in commercial buildings, hospitals, schools, and industrial facilities.

• They can be used in both new construction an...read more

Switch gear is a combination of electrical disconnect switches, fuses or circuit breakers used to control, protect and isolate electrical equipment.

• Switch gear is used to control the flow of electricity in a power system.

• It includes devices like circuit breakers, fuses, and disconnect switches.

• Switch gear is essential for protecting electrical equipment from overloads and short circuits.

• It helps in isolating faulty equipment from the rest of the system for maintenance or repa...read more

There are various types of transformers such as power transformers, distribution transformers, autotransformers, isolation transformers, etc.

• Power transformers are used in high voltage transmission systems.

• Distribution transformers are used to step down the voltage for distribution to homes and businesses.

• Autotransformers have a single winding and are used for voltage regulation.

• Isolation transformers are used to isolate a circuit from the power source.

• Other types include ins...read more

Transformer safety involves measures to prevent electrical hazards and ensure proper functioning of transformers.

• Regular maintenance and inspection of transformers is essential for safety

• Proper grounding and insulation to prevent electrical shocks

• Following safety protocols and procedures when working with transformers

• Using personal protective equipment (PPE) when handling transformers

• Avoiding overloading transformers to prevent overheating and fires

Chillers safety refers to the measures in place to ensure the safe operation of chillers and prevent accidents.

• Regular maintenance and inspections are crucial for ensuring the safety of chillers.

• Proper training of personnel on chiller operation and safety protocols is essential.

• Emergency shutdown procedures should be clearly defined and easily accessible.

• Safety features such as pressure relief valves and temperature sensors should be in place to prevent overloading and overhe...read more

HVAC stands for Heating, Ventilation, and Air Conditioning. It is a technology used for indoor and vehicular environmental comfort.

• HVAC systems regulate temperature, humidity, and air quality in buildings and vehicles.

• They consist of various components such as furnaces, air conditioners, heat pumps, ductwork, and thermostats.

• HVAC technicians install, maintain, and repair these systems.

• They also ensure that the systems are energy-efficient and comply with safety regulations.

• Ex...read more

DG stands for Diesel Generator. It is a type of generator that uses diesel fuel to produce electrical energy.

• DG is commonly used as a backup power source in case of power outages.

• It consists of an engine that runs on diesel fuel and a generator that converts mechanical energy into electrical energy.

• DGs are often used in industries, commercial buildings, hospitals, and residential areas.

• They are known for their reliability, durability, and ability to provide continuous power s...read more

OGT stands for Overall Gas Turbine. It is a measure of the overall performance of a gas turbine engine.

• OGT is calculated by taking into account various parameters such as turbine inlet temperature, compressor discharge pressure, and fuel flow rate.

• Monitoring OGT is crucial for ensuring the efficient operation of the gas turbine engine.

• An increase in OGT may indicate a potential issue with the engine, such as fouling of compressor blades or a malfunctioning fuel control system...read more

The Indian standard frequency is 50 Hz.

• The Indian standard frequency is used for power supply in India.

• It is also known as the mains frequency.

• It is different from the frequency used in some other countries like the US (60 Hz).

Maintenance equipment efficiency focuses on optimizing performance and reducing downtime through effective practices.

• Regular maintenance schedules prevent unexpected breakdowns, e.g., weekly checks on HVAC systems.

• Utilizing predictive maintenance tools can forecast equipment failures, e.g., vibration analysis in motors.

• Training staff on proper equipment use enhances efficiency, e.g., operators trained on CNC machine settings.

• Implementing a tracking system for maintenance hist...read more

Effectively managing risk involves identifying, assessing, and mitigating potential issues to ensure safety and operational efficiency.

• Identify potential risks: Conduct regular assessments to pinpoint areas of concern, such as equipment failure or safety hazards.

• Assess the impact: Evaluate the severity and likelihood of each risk, prioritizing them based on potential consequences.

• Develop a mitigation plan: Create strategies to minimize risks, such as implementing safety proto...read more

Hazards can be classified into various types, including physical, chemical, biological, ergonomic, and psychosocial hazards.

• Physical hazards: Examples include slips, trips, and falls due to wet floors or uneven surfaces.

• Chemical hazards: Exposure to harmful substances like asbestos or toxic chemicals in cleaning products.

• Biological hazards: Risks from bacteria, viruses, or mold, such as exposure to bloodborne pathogens.

• Ergonomic hazards: Poor workstation design leading to rep...read more