HVAC Interview, viva, and Part 2 of the Refrigeration and Air Conditioning Questions and Answers
The ratio of heat absorbed by the refrigerant to the work required to compress the refrigerant in the compressor is used to measure the efficiency of a refrigeration system.
a. Vapour compression refrigeration cycle b. Vapour absorption refrigeration cycle c. Air refrigeration cycle d. Steam jet refrigeration system e. Thermo electric refrigeration system.
Superheating is preferred in practice because it ensures that the liquid in the evaporator has completely vaporized before entering the compressor. Condensate should be sub-cooled because it lowers the vapour percentage after throttling, increasing the refrigeration effect per unit mass.
The vapour is drawn from the evaporator in an absorption refrigeration system by being absorbed into a liquid with a high affinity for the refrigerant. By applying heat to the solution, the refrigerant is expelled, and the temperature of the solution rises as a result. The condenser, where heat is rejected and the refrigerant is transformed into liquid form, received this refrigerant in the form of vapour. The cycle is finished when the liquid enters the evaporator once more under reduced pressure.
The total heat removed from the evaporator by the refrigerant is known as the refrigeration effect. It is called as Tonne of Refrigeration of kW.
Subcooling is the process of lowering the liquid refrigerant’s saturation temperature in the condenser, and superheating is the process of raising the vapour’s saturation temperature in the evaporator.
The net cooling effect to the work needed to produce the effect is measured by a refrigeration system’s coefficient of performance, or COP.
Throttling valves allow liquid refrigerants that are under high pressure and temperature to pass at a controlled rate after their pressure and temperature have been reduced.
Tonnes of refrigeration (TOR) are used to measure refrigeration capacity. 1 tonnes of refrigeration = 210 kJ/min (or) = 3. 5 kJ/sec (kW).
The amount of heat that must be removed in order to produce one ton of ice at zero degrees Celsius in a 24-hour period is known as a tonne of refrigeration.
As there are no moving parts in the system, it operates quietly and wear is minimal. The maintenance cost is low. The system does not depend upon electric power. It can be constructed with capacities well in excess of 1000 tons each. The COP of the compressor system decreases as the load is reduced, and the absorption system is nearly as efficient at reduced loads as it is at full load. By increasing the steam supplied to the generator, the absorption refrigeration system can run at a lower evaporator temperature with only a slight reduction in capacity. With lower evaporator temperature, its compression system’s capacity decreases quickly.
Human beings want to feel comfortable. They desire a climate that is neither extremely hot nor extremely cold, nor particularly humid nor extremely dry. High or low humidity could not accommodate human body’s desires. Only when they can freely release their waste heat into the environment do they feel comfortable.
The additional heat load caused by air entering the air conditioning system through tiny gaps in doors and windows, cracks in the walls, etc. , are termed as infiltration.
The ratio of the room’s sensible heat load to its overall heat load is known as the room sensible heat factor.
a. Sensible heating and sensible cooling b. Cooling and dehumidification c. Heating and humidification d. Mixing of air streams e. Chemical dehumidification f. Adiabatic evaporative cooling.
Top 20 HVAC Interview Questions and Answers for 2022
Questions about experience and background
These HVAC interview questions can help the hiring manager assess your suitability for the job:
Interview questions with sample answers
Here are six examples of scenario-based and technical skill HVAC interview questions you might encounter, along with explanations for how to respond to them:
A customer job is taking longer than it should and you have another appointment coming up. What do you do?
Being an HVAC technician can be a very interesting career, but there are days when you may have a lot of work to get done before your shift is over. Because some jobs may take longer than you anticipated, the interviewer wants to see how you handle pressure. You can respond to this situational interview question by outlining a hypothetical scenario and explaining to the interviewer what you would do if it ever occurred while you were at work.
Example: “Normally, we have a window of time to arrive at and complete each job. If this were to occur, I would call the client as soon as I became aware that we might be late for the scheduled appointment. I’d inform them that we were making every effort to arrive at the specified time and offer an apology if we were likely to be late. I think being open with customers is crucial to developing a rapport with them, and I would go above and beyond to make sure they were satisfied by the time the appointment was over. “.
If you’re looking for a job to improve your technical abilities, check out wisdom jobs, which offer a variety of opportunities in a wide Being a technician will make you very important to the needs of the public. It will develop your talent and maintain its prominence for contemporary basic needs in the home. HVAC technicians install and repair refrigeration, heating, and air quality systems in residential buildings. They must have experience installing or repairing specific systems or pieces of machinery. If you want to learn more, visit our page with interview questions and solutions for HVAC jobs. Grab the opportunity with the skills you possess and confidence.
a. Vapour compression refrigeration cycle b. Vapour absorption refrigeration cycle c. Air refrigeration cycle d. Steam jet refrigeration system e. Thermo electric refrigeration system.
The amount of heat that must be removed in order to produce one ton of ice at zero degrees Celsius in a 24-hour period is known as a tonne of refrigeration.
The ratio of heat absorbed by the refrigerant to the work required to compress the refrigerant in the compressor is used to measure the efficiency of a refrigeration system.
Superheating is preferred in practice because it ensures that the liquid in the evaporator has completely vaporized before entering the compressor. Condensate should be sub-cooled because it lowers the vapour percentage after throttling, increasing the refrigeration effect per unit mass.
Throttling valves allow liquid refrigerants that are under high pressure and temperature to pass at a controlled rate after their pressure and temperature have been reduced.
HVAC Interview Questions and Answers PDF
Frequently Asked Questions and Answers for HVAC Officer, HVAC Engineer, and HVAC Technician Interviews
FAQ
What questions are asked in an HVAC interview?
- What do you know about our company?
- Why are you looking for new opportunities?
- Why do you want to work with us?
- What are your wage expectations?
- Are you actively interviewing?
- Why did you leave your previous employers?
- How would former clients and employers describe you ?
- What shifts are you available?
What are the 15 most common interview questions and answers?
- Can you tell me a little about yourself?
- How did you hear about the position?
- What do you know about the company?
- What are your greatest professional strengths?
- What do you consider to be your weaknesses?
- What is your greatest professional achievement?
What are the 10 interview questions and answers?
- Could you briefly introduce yourself and outline your background for me?
- How did you hear about this position? …
- What type of work environment do you prefer? …
- How do you deal with pressure or stressful situations? …
- Do you prefer working independently or on a team?
What should I expect from my HVAC apprenticeship interview?
Common HVAC interview questions Tell me about a time when you solved a challenging problem. What skills have you learned in your previous jobs that have prepared you well for a career in HVAC service? Tell me about your mechanical aptitude and experience with tools.
