Blue Star Senior Territory Manager Interview Questions and Answers

Q1. Explain basic Refrigeration cycle
Ans. 
The refrigeration cycle is a process that removes heat from a space and transfers it to the outside environment.
• The cycle starts with the compressor compressing the refrigerant gas, which raises its temperature and pressure.

• The hot refrigerant gas then flows through the condenser coils, where it releases heat and condenses into a liquid.

• The liquid refrigerant then flows through the expansion valve, which reduces its pr...read more
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Q2. Which refrigerant is currently used in Air conditioning systems now a days
Ans. 
The most commonly used refrigerant in air conditioning systems nowadays is R-410A.
• R-410A is a hydrofluorocarbon (HFC) refrigerant that does not contribute to ozone depletion.

• It has replaced the previously used R-22 refrigerant, which is being phased out due to its harmful effects on the environment.

• R-410A has a higher cooling capacity and operates at higher pressures than R-22.

• It is used in both residential and commerc...read more
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Q3. Operating pressure & boiling points of R--22 and R-32 gases
Ans. 
R-22 has a boiling point of -40.8°C and an operating pressure of 4048 kPa. R-32 has a boiling point of -51.7°C and an operating pressure of 5880 kPa.
• R-22 has a higher operating pressure than R-32

• R-32 has a lower boiling point than R-22

• Operating pressure and boiling point are important factors to consider when working with refrigerant gases
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Q4. Explain various modes of heat transfer
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Heat transfer occurs in three modes: conduction, convection, and radiation.
• Conduction: Heat transfer through a material without any movement of the material itself. Example: Touching a hot stove.

• Convection: Heat transfer through the movement of fluids (liquids or gases). Example: Boiling water.

• Radiation: Heat transfer through electromagnetic waves. Example: Feeling the warmth of the sun.
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Q5. Explain the requirements of U- bends in the Cu-pipings
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U-bends are required in Cu-pipings to prevent the formation of airlocks and to facilitate the flow of fluids.
• U-bends are used to create a trap in the piping system to prevent the accumulation of air or gas pockets.

• They also help in maintaining a constant flow of fluids by preventing blockages.

• U-bends are commonly used in plumbing systems, HVAC systems, and industrial piping systems.

• The size and shape of the U-bend depe...read more
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Q6. Operating temperatures of Commercial refrigeration units
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Commercial refrigeration units have varying operating temperatures depending on the type and purpose of the unit.
• The operating temperature of a commercial refrigeration unit depends on its intended use and the type of refrigerant used.

• For example, a walk-in freezer typically operates at -10 to 0 degrees Fahrenheit, while a reach-in refrigerator may operate at 35 to 40 degrees Fahrenheit.

• It is important to ensure that t...read more
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Q7. Usage of Thermostats
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Thermostats are used to regulate temperature in homes and buildings.
• Thermostats can be programmed to adjust temperature based on time of day or occupancy.

• Smart thermostats can be controlled remotely through a mobile app.

• Thermostats can also be used to monitor energy usage and save money on utility bills.

• Different types of thermostats include programmable, non-programmable, and smart thermostats.

• Thermostats are commonly...read more
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Explain the methods used to meet customer's cooling requirements at a very low Voltage & high ambient conditions

Q1. Please give a Brief introduction of yourselves
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Q2. Reasons for leaving the current job
Ans. 
I am seeking new challenges and opportunities for growth that align with my career aspirations and professional development goals.
• Career Advancement: I feel that I have reached a plateau in my current role and am looking for a position that offers more opportunities for advancement.

• Skill Development: I want to expand my skill set and take on new responsibilities that will help me grow professionally, such as leading la...read more
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