The refrigeration compressor in a water cooled refrigeration system is short cycling on the high pressure cutout switch. The C.O.P. ... B Wet bulb temperature increases . High superheat of the vapor in the system would cause _____. Refrigeration and air conditioning mcq questions converted 1. 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. Basic Refrigeration System Fundamentals - The Compression Cycle. The compressor serves two functions. All these actions are in sequence. The COP of the cycle is: Assertion ( A): I n a practical vapour compression refrigerator, the vapour should leave the evaporator with a definite amount of superheat. Another name for the reciprocating compressor is the piston compressor. 3.The coefficient of performance is within the range of 3 to 6 except at very  low temperature when it may be less than 1. B. a more efficient unit. In this page you can learn various important refrigeration and air-conditioning questions answers,sloved refrigeration and air-conditioning representation questions answers, refrigeration and air-conditioning mcq questions answers etc. c) The brine or water is the refrigerant. One reason for this could be the a] system is low on refrigerant b] high pressure cut out is improperly adjusted c] discharge valves are leaking slightly d] discharge valves are leaking excessively Evaporator: This is the part of the refrigeration system that is doing the actual cooling. Ans: b 2. 81. What is the COP for this refrigeration cycle? Ans: a. Moisture should be removed from refrigerants to avoid. Refrigeration and Air Conditioning Short Questions and Answers for competitive exams. Compressor-powered refrigerators sometimes referred to as two-way refrigerators use a small compressor unit to cool the refrigerator. Introduction to Vapour Compression System: For a closed cycle of refrigeration employing the condensable refrigerant vapour, the following processes are required: (i) Compression of the vapour, thereby increasing pressure. Leakage of ammonia can be detected by' halide torch method. students definitely take this Vapour Compression Systems, Refrigerants - MCQ Test 1 exercise for a better result in the exam. Dielectric strength of refrigerants is an important property in hermetically sealed compressor units. Page-1 section-2 C Specific humidity increases . Ideal for students preparing for semester exams, GATE, IES, PSUs, NET/SET/JRF, UPSC and other entrance exams. a. to increase volumetric efficiency of of compressor b. to allow the system to operate between higher pressures c. to reduce risk of damage to refrigerant d. all of the above View Answer / … In this mechanical engineering coures we study of power plant mcq or objective. These short objective type questions with answers are very important for competitive exams. Therefore statement (b) is wrong. 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. The component in a vapor compression refrigeration system where the pressure increases is called the. Q13. Ammonia does not mix freely with lubricating oil. A. an increase in capacity. the work done by the compressor).. As can be seen, the better (more efficient) the refrigerator is when more heat Q … Sub-cooling with regenerative heat exchanger is used in a refrigeration cycle. Saturation pressure – temperature relationship. This compressor comprises a motor, a crankshaft, and some pistons. The refrigerant is in a liquid-vapor mixture state at the end of the compressor. Often they have two ways of powering the compressor either through 12-volt battery power or 110-volt power, … long questions & short questions for Mechanical Engineering on EduRev as well by searching above. Highest quality compressor in the world. 1.The work of compressor in vapour compression refrigeration system  increases with superheat of the suction vapour. Consider the following statements:  In the case of a vapour compression machine, if the condensing temperature of the refrigerant is closer to the critical temperature, then there will be: Assertion (A): In vapour compression refrigeration system throttle valve is used and not expansion cylinder. Mechanical Engineering which will improve your skill. a) The system is a direct refrigeration system. 2. A standard ice point temperature corresponds to the temperature of (a) water at 0°C (b) ice … The COP of the cycle would be a) 1 b) 2.38 c) 4.76 d) 5. Selection of a refrigerant for a vapour – compression system depends on which among the following? The enthalpy at outlet of isentropic compressor is 230 kJ/kg and enthalpy of subcooled liquid is 68 kJ/kg. A standard vapour compression refrigeration cycle consists of the following 4 thermodynamic processes in sequence: Isothermal expansion, isentropic compression, isothermal compression and isentropic expansion, Constant pressure heat addition, isentropic compression, constant pressure heat rejection and isentropic expansion, Isothermal expansion, constant pressure heat addition, isothermal compression and constant pressure heat rejection, The enthalpies at the beginning of compression, at the end of compression and at the end of condensation are respectively 185 kJ/kg, 210 kJ/kg and 85 kJ/kg. Dielectric strength of refrigerants is an important property in hermetically sealed compressor units. This test comprises of 50 questions on Thermodynamics. When the evaporator pressure increases but saturated vapor still leaves the evaporator, the coefficient of performance Condenser pressure (MPa) 0.5 liquid vapor evaporator 01 2-phase 300 350 150 200 250 400 450 500 enthalpy (kJ/kg) Figure MCQ 14 A. increases B. decreases C. does not … You can find other Vapour Compression Systems, Refrigerants - MCQ Test 1 extra questions, Choose the letter of the best answer in each questions. 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. The enthalpies at condenser outlet and evaporator outlet are 78 and 182 kJ/kg respectively. A and R are true. Environmental protection agencies advise against the use of chlorofluorocarbon refrigerants because these react with. The compressor is the mechanical heart of a refrigeration system. © Copyright 2016. Reason (R): It reduces the work done by the compressor. The type of compressor used in refrigeration system is a) Reciprocating b) Centrifugal c) Rotary screw compressor d) All of the above. Thus statements 1 and 4 are correct and choice (d) is the right choice. 8. 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. EduRev is a knowledge-sharing community that depends on everyone being able to pitch in when they know something. Each crankshaft rotation achieves actions: suction, compression, and discharge. But R is not right reasoning for A. Refrigerant CO2 is used in reciprocating compressors. ... 1.The work of compressor in vapour compression refrigeration system increases with superheat of the suction vapour. ASWDC (App, Software & Website Development Center) Darshan Institute of Engineering & Technology (DIET) b. 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