Structwel Hvac Technician Interview Questions and Answers

Q1. How to convert from A.C to D.c. Supply
Ans. 
A.C to D.C. conversion can be done using a rectifier circuit.
• A rectifier circuit can be used to convert A.C. to D.C.

• The rectifier circuit can be half-wave or full-wave.

• Half-wave rectifier only allows half of the A.C. wave to pass through, while full-wave rectifier allows the entire wave.

• The rectifier circuit can be made using diodes.

• The output of the rectifier circuit is not smooth and requires filtering using capacito...read more
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Q1. Hvac chiller service
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Q2. Installation
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Reasoning based questions

Q1. All related to thermodynamics
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Q2. Hvac working principle
Ans. 
HVAC systems work by transferring heat from one area to another using refrigerant to cool or heat the air.
• HVAC systems use refrigerant to absorb and release heat

• Air is circulated through ducts to distribute the cooled or heated air

• Thermostats control the temperature settings of the HVAC system
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Q3. Chillers theory and working principle with all technical questions
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Regarding your personal skills

Q1. Regarding your experience
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Q1. About Previous job and academic qualification
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Q1. What is the superheat , how to calculate superheat
Ans. 
Superheat is the temperature increase of a vapor above its boiling point at a given pressure.
• Superheat is important in HVAC systems to ensure proper refrigerant flow and system efficiency.

• It is calculated by subtracting the boiling point temperature of the refrigerant at a given pressure from the actual temperature of the refrigerant.

• The ideal superheat value varies depending on the type of refrigerant and the specific...read more
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Q2. What is sup cooling What is function of expension value
Ans. 
Subcooling is the process of cooling a liquid refrigerant below its saturation temperature.
• Subcooling is achieved by removing heat from the refrigerant after it has been condensed.

• It ensures that the refrigerant is in a liquid state before it enters the expansion valve.

• The expansion valve reduces the pressure of the refrigerant and controls the flow rate into the evaporator.

• This causes the refrigerant to evaporate and ...read more
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Q3. Why are increased head pressure
Ans. 
Increased head pressure in HVAC systems can be caused by various factors.
• Dirty condenser coils

• Blocked or restricted airflow

• Refrigerant overcharge

• Malfunctioning expansion valve

• Faulty compressor

• Ambient temperature increase

• Clogged filter drier

• Low refrigerant charge

• Kinked or blocked refrigerant lines
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