Mechanical Engineering Exam > Mechanical Engineering Notes > Thermodynamics > GATE Past Year Questions: Vapour Refrigeration
GATE Past Year Questions: Vapour Refrigeration
Q1: Consider an ideal vapour compression refrigeration cycle working on R-134a refrigerant. The COP of the cycle is 10 and the refrigeration capacity is 150 kJ/kg. The heat rejected by the refrigerant in the condenser is _______kJ/kg (round off to the nearest integer). [GATE ME 2021 SET-2]
Ans: 165 to 165
RE = 150 kJ/kg
COP = 10
COP = QL/Win
⇒ Win = 15 kJ/kg
QH = QC = QL + Win
= 150 +15
= 165 kJ/kg
Q2: Consider an ideal vapour compression refrigeration cycle. If the throttling process is replaced by an isentropic expansion process, keeping all the other processes unchanged, which one of the following statements is true for the modified cycle? [GATE ME 2019 SET-1]
(a) Coefficient of performance is higher than that of the original cycle.
(b) Coefficient of performance is lower than that of the original cycle.
(c) Coefficient of performance is the same as that of the original cycle.
(d) Refrigerating effect is lower than that of the original cycle.
Ans: (a)
Due to isentropic expansion instead of throttling
1. R.E increases
2. Work input reduces
∴ COP = R.E/Win
500695,500698,500700,500708,500710,500793,500794,500797,500807,500808,500812,500813,500815,500817
as
sa
asas
The document GATE Past Year Questions: Vapour Refrigeration is a part of the Mechanical Engineering Course Thermodynamics.
All you need of Mechanical Engineering at this link: Mechanical Engineering
FAQs on GATE Past Year Questions: Vapour Refrigeration
| 1. What is the basic principle of the vapor-compression refrigeration cycle? |  |
Ans. The vapor-compression refrigeration cycle operates on the principle of heat absorption and rejection. It involves four main processes: evaporation, compression, condensation, and expansion. In the evaporator, the refrigerant absorbs heat from the surroundings, causing it to evaporate. The vapor is then compressed to a higher pressure and temperature in the compressor. Next, the high-pressure vapor releases its heat to the environment in the condenser, condensing back into a liquid. Finally, the refrigerant passes through an expansion valve, reducing its pressure and temperature before entering the evaporator again.
| 2. What are the key components of a vapor refrigeration system? | |
Ans. A vapor refrigeration system typically includes four key components: the evaporator, compressor, condenser, and expansion valve. The evaporator absorbs heat, the compressor increases the pressure and temperature of the refrigerant, the condenser releases heat to the surroundings, and the expansion valve controls the flow of refrigerant into the evaporator, allowing it to expand and cool down.
| 3. How does the coefficient of performance (COP) relate to the efficiency of a vapor refrigeration cycle? | |
Ans. The coefficient of performance (COP) is a measure of the efficiency of a refrigeration cycle. It is defined as the ratio of the refrigeration effect (heat removed from the refrigerated space) to the work input required by the compressor. A higher COP indicates a more efficient refrigeration cycle, meaning that the system provides more cooling for each unit of work input. It is crucial for evaluating and comparing the performance of different refrigeration systems.
| 4. What refrigerants are commonly used in vapor refrigeration systems? | |
Ans. Common refrigerants used in vapor refrigeration systems include R-134a, R-410A, R-22, and R-404A. Each refrigerant has different thermodynamic properties, environmental impacts, and applications. For example, R-134a is widely used in domestic refrigerators and automotive air conditioning, while R-410A is favored for residential and commercial air conditioning systems due to its higher efficiency and lower environmental impact compared to older refrigerants.
| 5. What are the advantages of using vapor refrigeration systems? | |
Ans. Vapor refrigeration systems offer several advantages, including high efficiency, reliability, and versatility. They can be designed to operate in various temperature ranges, making them suitable for cooling applications in both domestic and industrial contexts. Additionally, these systems can be easily scaled for different cooling capacities and are generally well-understood and widely used in the industry, resulting in lower maintenance costs and availability of spare parts.
About this Document
4.68/5 Rating
Apr 19, 2026 Last updated
Related Exams
Document Description: GATE Past Year Questions: Vapour Refrigeration for Mechanical Engineering 2026 is part of Thermodynamics preparation. The notes and questions for GATE Past Year Questions: Vapour Refrigeration have been prepared according to the Mechanical Engineering exam syllabus. Information about GATE Past Year Questions: Vapour Refrigeration covers topics like and GATE Past Year Questions: Vapour Refrigeration Example, for Mechanical Engineering 2026 Exam. Find important definitions, questions, notes, meanings, examples, exercises and tests below for GATE Past Year Questions: Vapour Refrigeration.
Introduction of GATE Past Year Questions: Vapour Refrigeration in English is available as part of our Thermodynamics for Mechanical Engineering & GATE Past Year Questions: Vapour Refrigeration in Hindi for Thermodynamics course. Download more important topics related with notes, lectures and mock test series for Mechanical Engineering Exam by signing up for free. Mechanical Engineering: GATE Past Year Questions: Vapour Refrigeration
Description
GATE Past Year Questions: Vapour Refrigeration of Thermodynamics
Information about GATE Past Year Questions: Vapour Refrigeration
In this doc you can find the meaning of GATE Past Year Questions: Vapour Refrigeration defined & explained in the simplest way possible. Besides explaining types of GATE Past Year Questions: Vapour Refrigeration theory, EduRev gives you an ample number of questions to practice GATE Past Year Questions: Vapour Refrigeration tests, examples and also practice Mechanical Engineering tests
Related Searches
GATE Past Year Questions: Vapour Refrigeration, Free, Exam, Semester Notes, pdf , practice quizzes, Sample Paper, Summary, past year papers, study material, shortcuts and tricks, mock tests for examination, Previous Year Questions with Solutions, video lectures, ppt, Viva Questions, MCQs, Objective type Questions, GATE Past Year Questions: Vapour Refrigeration, GATE Past Year Questions: Vapour Refrigeration, Important questions, Extra Questions;