This set of Refrigeration Multiple Choice Questions & Answers (MCQs) focuses on “Mechanism of Simple VCR System”. 1. A vapor compression refrigeration system is an improved type of air refrigeration system in which a suitable working substance, termed as refrigerant is used. a) True b) False View Answer Answer: a 2. The vapor compression refrigeration system is similar to a ________ a) latent heat pump b) latent heat engine c) generator d) evaporator View Answer Answer: a 3. The first vapor compression refrigeration system was developed by ________ a) L. G. Hamilton b) Jacob Perkins c) Stephen Rossi d) Lenard Sandwik View Answer Answer: b 4. The COP of vapor compression refrigeration compared to simple air refrigeration system is ________ a) high b) low c) same d) can’t say View Answer Answer: a 5. Which of the following is not an advantage of vapor compression refrigeration system over air refrigeration system? a) Smaller size for a given capacity of refrigeration b) It has less running cost c) It can be employed over wide range of temperature d) There is no problem of leakage in vapor compression refrigeration system View Answer Answer: d 6. The low pressure and temperature vapor refrigerant enters the ______ of the vapor compression system. a) compressor b) condenser c) receiver d) evaporator View Answer Answer: a 7. The high pressure and temperature vapor refrigerant enters the ______ of the vapor compression system. a) compressor b) condenser c) receiver d) evaporator View Answer Answer: b 8. In any compression refrigeration system there are how many pressure conditions? a) 1 b) 2 c) 3 d) 4 View Answer Answer: b 9. Which of the following is not an advantage of vapor compression cycle over reversed Carnot cycle? a) It’ COP and refrigeration effect can’t be increased b) Use of expansion valve reduces the size and cost of plant c) It is a practical cycle on which plant can be built d) Wet compression of Carnot cycle is avoided View Answer Answer: a 10. The pipe line emanating from compressor up to the condenser is called ________ a) suction line b) pipe line c) liquid line d) delivery line View Answer Answer: d 11. The coefficient of performance of a vapour compression refrigeration system is quite high as compared to the air refrigeration system. a) True b) False View Answer Answer: a 12. In a refrigeration cycle, in which of the following heat absorption takes place? a) Evaporator b) Condenser c) Expansion valve d) Compressor View Answer Answer: a 13. After which process during the VCR cycle, the highest temperature is achieved? a) Evaporation b) Expansion c) Condensation d) Compression View Answer Answer: d Explanation: The compression process is used to increase the pressure. So, according to Gay-Lussac’s law, P ∝ T As the highest pressure obtained after compression, the temperature obtained is also the highest. 14. The expansion valve in a refrigerator does not control the flow of refrigerant. a) False b) True View Answer Answer: a 15. In a domestic vapour compression refrigerator, which of the following refrigerants commonly used? View Answer Answer: c Sanfoundry Global Education & Learning Series – Refrigeration & Air Conditioning. To practice all areas of Refrigeration & Air Conditioning, here is complete set of 1000+ Multiple Choice Questions and Answers.
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn. Subscribe to his free Masterclasses at Youtube & technical discussions at Telegram SanfoundryClasses.
Merits and Demerits of Vapour Compression System Over Air Refrigeration System Points : Merits and Demerits of Vapour Compression System Over Air Refrigeration System Merits 1. C.O.P. is quite high as the working of cycle is very near to that of reversed Carnot cycle; 2. When used on ground level the running cost of vapour-compression refrigeration system is only 1/5th of air refrigeration system. 3. For the same refrigeration effect the size of the evaporator is smaller. 4. The required temperature of evaporator can be achieved simply by adjusting the throttle valve of the same unit. Demerits 1. Initial cost is high. 2. The major disadvantages are inflammability, leakage of vapours and toxity. These have been overcome to great extent by improvement in design. |