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REFRIGERATION CONDENSERS & EVAPORATORS MULTIPLE CHOICE QUESTIONS (MCQ) WITH ANSWERS

REFRIGERATION CONDENSERS & EVAPORATORS MULTIPLE CHOICE  QUESTIONS (MCQ) WITH ANSWERS   Condensers and evaporators are phase change equipment’s. Condensers change vapors into liquid on cooling. Evaporators convert liquid into vapors by consuming heat. Dry evaporators are used in domestic units. These ensure that only super heated vapor goes to the compressor for its safety. Flooded evaporators…

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REFRIGERATION COMPRESSORS MULTIPLE CHOICE QUESTIONS (MCQ) WITH ANSWERS

REFRIGERATION COMPRESSORS MULTIPLE CHOICE QUESTIONS (MCQ) WITH ANSWERS  Compressors in refrigeration is the heart of the system. This increases the temperature and pressure of the refrigerant. It enables to loose heat to the surroundings. Basis of compressor selection are pressure rise and volume handled. 1. In refrigeration, compressor in a refrigeration system increases (a) Temperature…

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REFRIGERATION & AIR CONDITIONING -QUESTION BANK

REFRIGERATION & AIR CONDITIONING -QUESTION BANK Short questions increase the understanding and clarity to a greater depth. It enables to apply the fundamentals in real life. Searching answers makes oneself confident. REFRIGERATION Thermodynamic properties of a refrigerant?  Transport properties of a refrigerant?  Chemical properties of a refrigerant? Physical properties of a refrigerant? Toxic properties of…

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COOLING LOADS QUESTION ANSWERS CLASS NOTES

COOLING LOADS QUESTION  ANSWERS CLASS NOTES Heat loads determine the capacity of a refrigeration plant for a certain application. These heat loads consist of sensible and latent heat loads. Sensible heat is due to difference of temperature. Latent heat is due to change of state. Fig. Cooling Load Calculations  Q1. What are Sensible heat loads? Give…

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REFRIGERANTS SHORT QUESTION ANSWERS CLASS NOTES

REFRIGERANTS SHORT QUESTION  ANSWERS CLASS NOTES Refrigerant is a working substance in refrigeration. There are many types of refrigerants. Each is for a certain specific purpose. Refrigerants ammonia, R-134a and air are in common use. Their selection depends upon many factors. It should have least ozone depletion and Global warming potential. An azeotrope forms from…

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SHORT QUESTION ANSWERS-PSYCHROMETRY CLASS NOTES FOR MECHANICAL ENGINEERING

PSYCHROMETRY SHORT QUESTION ANSWERS CLASS NOTES FOR MECHANICAL ENGINEERING Question answers are helpful in understanding the psychrometry. This also increases clarity. It is useful in design of air conditioning equipment. This also help in overcoming practical difficulties. Q1. Define dry bulb temperature, wet bulb temperature and dew point temperature. Dry bulb temperature, tdb It is temperature…

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CASCADE REFRIGERATION CLASS NOTES FOR MECHANICAL ENGINEERING

CASCADE REFRIGERATION CLASS NOTES FOR MECHANICAL ENGINEERING Cascade refrigeration creates low temperatures in the range of -700C to -1000C. For the same purpose, multi- stage vapor compression refrigeration systems are in use. Cascade refrigeration system has numerous advantages over multi-stage vapor compression systems. Cascade Refrigeration Systems Need of Cascade Refrigeration Many industrial and medical applications…

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SHORT QUESTION ANSWERS- AIR CONDITIONING CLASS NOTES

     QUESTION ANSWERS ON AIR  CONDITIONING CLASS NOTES Question answers on air conditioning make it easier to understand. Knowledge increases to handle difficult situations. Air conditioning is of two types. These are comfort and industrial air conditioning.   Comfort is for living beings. Industrial air conditioning increases production with improved quality. Fans are used…

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THROTTLING AND FREE EXPANSION PROCESSES CLASS NOTES

  THROTTLING AND FREE EXPANSION PROCESSES CLASS NOTES  Expansion process at constant enthalpy is throttling. It is irreversible. No work on decrease of pressure. This is a necessity in liquefaction and vapor refrigeration. Free expansion is at constant internal energy. This is irreversible non flow process. No work available.   Throttling Process This is an…

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STEAM JET REFRIGERATION CLASS NOTES FOR MECHANICAL ENGINEERING

STEAM JET REFRIGERATION CLASS NOTES FOR MECHANICAL ENGINEERING   This refrigeration means refrigeration from heat. It uses a steam nozzle to create vacuum in the flash chamber. High vacuum causes water to evaporate and evacuate. Water vapors mix with high velocity steam jet. These are compressed in the diffuser. Mixture condenses in the condenser for recycling….