The refrigerant is in a liquid-vapor mixture state at the end of the compressor. compressor. All Rights Reserved. Ozone Depletion Potential (ODP): According to the Montreal protocol, the ODP of refrigerants should be zero, i.e., they should be non-ozone depleting substances. The motor rotates the crankshaft, which then pushes the pistons. Refrigeration and air conditioning mcq questions converted 1. Stored chilled water or stored ice in tanks is used to provide cooling in buildings during peak hours when high electric demand charges and electric energy rates are in effect. students definitely take this Vapour Compression Systems, Refrigerants - MCQ Test 1 exercise for a better result in the exam. The effect of under cooling the refrigerant is to a) Reducing the COP of the cycle b) Increase the COP of the cycle ADVERTISEMENTS: (ii) … Engines - Two-Stroke & Non-Conventional Engines, Thermodynamics - Entropy, Exergy or Availability, Theory of Machines - Vibrations, Cam and Follower, Governor, Gyroscope. This contains 20 Multiple Choice Questions for Mechanical Engineering Vapour Compression Systems, Refrigerants - MCQ Test 1 (mcq) to study with solutions a complete question bank. Q13. Ammonia does not mix freely with lubricating oil. As a result, gas displacement is discontinuous an… c) The brine or water is the refrigerant. Practically all common refrigerants have approximately the same COP and power requirement. Sub-cooling with regenerative heat exchanger is used in a refrigeration cycle. Q5. Consider the following statements regarding refrigerants: 1. Following mechanical engineering multiple choice objective questions and and will help you in ssc je 2020, ESE 2020, Gate 2020, IES 2020, psu 2020 examinations. Compressor-powered refrigerators sometimes referred to as two-way refrigerators use a small compressor unit to cool the refrigerator. What is the COP for this refrigeration cycle? Dielectric strength of refrigerants is an important property in hermetically sealed compressor units. Refrigeration and Air Conditioning MCQ Questions 1-One ton of refrigeration is equal to (A) 21 KJ/min (B) 105 KJ/min (C) 210 KJ/min (D) 420 KJ/min 2-A low side float valve maintains the level of refrigerant in (A) Flooded evaporator (B) Evaporator (C) Condenser (D) Compressor 3-When wet bulb and … The enthalpy at outlet of isentropic compressor is 230 kJ/kg and enthalpy of subcooled liquid is 68 kJ/kg. Since ODP depends mainly on the presence of chlorine or bromine in the molecules, refrigerants having either chlorine (i.e., CFCs and HCFCs) or bromine cannot be used under the new regulations. In a vapour compression cycle, the refrigerant, immediately after expansion value is: In P-h diagram it is point 4' or 4 both are very wet vapour. Make sure to familiarize each and every questions to increase the chance of passing the Mechanical Board Examination. Learn Refrigeration And Air Conditioning MCQ questions & answers are available for a Mechanical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. The correct sequence of the given components of a vapour compression refrigerator is: Evaporator, compressor, condenser and throttle valve, Condenser, throttle valve, evaporator and compressor, Compressor, condenser, throttle valve and evaporator, Throttle valve, evaporator, compressor and condenser. inside a refrigerator) divided by the work W done to remove the heat (i.e. This contains 20 Multiple Choice Questions for Mechanical Engineering Vapour Compression Systems, Refrigerants - MCQ Test 1 (mcq) to study with solutions a complete question bank. ANSWER: c. either throttling valve or capillary tube, ANSWER: a. more dangerous than the dry compression in vapour compression refrigeration system, ANSWER: b. the mass fraction of vapour in liquid-vapour mixture of refrigerant at inlet to the evaporator, ANSWER: b. heat is rejected from surroundings to refrigerant, ANSWER: b. becomes higher for a given condensation temperature. The enthalpies at condenser outlet and evaporator outlet are 78 and 182 kJ/kg respectively. Ideal for students preparing for semester exams, GATE, IES, PSUs, NET/SET/JRF, UPSC and other entrance exams. 81. For 1 kg/s of refrigerant, what is the refrigeration effect? For simple vapour compression cycle, enthalpy at suction = 1600 kJ/kg, enthalpy at discharge from the compressor = 1800 kJ/kg, enthalpy at exit from condenser = 600 kJ/kg. Thermodynamics - Refrigeration, Psychrometry, Steam Generators, Gas Cycle Refrigeration - MCQs with Answers, Vapour Absorption Refrigeration System - MCQs with Answers, Vapour Compression Refrigeration Cycle - MCQs with Answers, Automobile Engineering - Chassis, Auto-Electrical, Heating & AC Systems, I.C. To be produced, GATE, IES, PSUs, NET/SET/JRF, UPSC and other entrance exams vapor the... In direct contact with the material being refrigerated as two-way refrigerators use a small compressor to! 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