HVA 315373 Guessing Paper & IMP Question Bank: Heating Ventilation Air Conditioning

In this article, we share all the important questions and the guessing paper of HVA 315373 Heating Ventilation Air Conditioning subject.

These questions are separated from analyzing all previous exams and the new syllabus of Heating, Ventilation Air Conditioning.

HVA 315373 Guessing Paper MSBTE Winter 2025 Exam

Q.1: Attempt any FIVE of the following :

1. Define the following terms: Apparatus Dew Point (ADP) Bypass Factor (BPF) Sensible Heat Factor (SHF)
2. Classify condensers used in refrigeration system.
3. Why is insulation necessary in air conditioning? /properties of a good insulating material and list any four examples.
4. List the major components of an Automobile Air Conditioning system and state their functions.
5. What are the different types of air distribution systems

Q.2: Attempt any THREE of the following :

1. Explain the working of a Scroll compressor with a neat sketch. State its applications
2. Draw a neat layout of a Direct Central Air Conditioning/Cassette Air Conditioning system and explain the function of each component.
3. Differentiate between Summer Air Conditioning and Winter Air Conditioning systems.

IMP Question Bank: Heating Ventilation Air Conditioning

Unit I: Applied Psychrometry (10 Marks)

1. Numerical (Psychrometric Chart):
   • Air at 35°C Dry Bulb Temperature (DBT) and 60% Relative Humidity (RH) is cooled and dehumidified to 20°C DBT and 50% RH. Represent this process on a psychrometric chart. Find the following properties per kg of dry air:
     • (i) Change in Specific Humidity (Moisture Removed)
     • (ii) Change in Enthalpy
     • (iii) Sensible Heat Factor (SHF)
   • (Based on TLO 1.1, 1.2 )
2. Theory (Thermal Comfort):
   • What is “Thermal Comfort”? Explain in detail the six primary factors that affect the thermal comfort of the human body.
3. Theory (Indoor Air Quality):
   • Define Indoor Air Quality (IAQ). List common indoor air contaminants and explain the basic strategies to improve IAQ in a commercial building.
4. Short Notes:
   • Define and explain the following terms with a small sketch on a psychrometric chart:
     • (i) Apparatus Dew Point (ADP)
     • (ii) Bypass Factor (BPF)
     • (iii) Sensible Heat Factor (SHF)

Unit II: Cooling System Components (14 Marks)

1. Comparison (Compressors):
   • Differentiate between a Hermetically sealed compressor and an Open type compressor on at least six key parameters (e.g., construction, application, leakage, maintenance).
2. Sketch & Working (Compressors):
   • With a neat sketch, explain the construction and working of a Scroll Compressor. State its typical applications.
   • (You can also be asked for Screw or Rotary compressors)
3. Sketch & Working (Expansion Valves):
   • Draw a neat, labeled sketch of a Thermostatic Expansion Valve and explain its working principle.
4. Sketch & Working (Evaporators):
5. Explain the construction and working of a Flooded Type Evaporator with a neat sketch. How does it differ from a dry expansion (DX) type?.

Conclusion

All important topics and the guessing paper of Heating Ventilation Air Conditioning as per the new teaching scheme are given under this article.

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