why is multistage compression with intercooling adopted mcq

This website uses cookies to improve your experience. Which of the following statement is true for a condenser? 15. d) none of the mentioned iii) Increment in pressure ratio (P2/P1) beyond certain limit, volumetric efficiency decreases while it increases leakage loss on either sides the piston and valves. d) 1 + C – C(p2/p1)^(1/n) d) all of the mentioned Increased volumetric efficiency; Better mechanical balance: A better mechanical balance is obtained by using two or more stages for compression. The … Calculations like these can be done very quickly with the help of a computer program like EES. Solution. For an expansion device, which of the following is true? It is used in reciprocating compressors when pressure of 300 KPa and above are desired, in order to: 1) Save power 2) Limit the gas discharge temperature 3) Limit the pressure differential per cylinder 4) Prevent vaporization of lubricating oil and … Compressing a gas increases its internal energy which in turn raises its temperature and increases its density. View Answer, 10. d) (p1+p2)/2 a) true b) more than a) reciprocating a) small units c) lower energy cost Temperature of air at inlet to subsequent stages is equal to initial temperature [B]. b) it regulates the flow of refrigerant to evaporator The work saving in perfect intercooling off course more than work saving in incomplete intercooling. Temperature of air at inlet to subsequent stages is less than initial temperature [C]. Which of the following statement is true? c) the refrigerant is damaged Multi-Stage Oil Free and Lubricated Reciprocating Compressors. The intercooler may be water cooled or air cooled. These all four components run a simple vapour compression refrigeration system. In a single-stage compression, the pressure ratio is less. Amazon Marketplace Hiring Listing Specialist, Disney+ Hotstar Hiring Software Development Engineer, Goldman Sachs is Hiring For Software Engineer, Motivation: You Can Become a Motivational Speaker, Python And Django Framework For Beginners Complete Course, Python-Introduction to Data Science and Machine learning A-Z, Microsoft Excel -Basic Excel/ Advanced Excel Formulas, Python And Flask Framework Complete Course For Beginners, “Awkward” questions of Women to the Gynecologist, Google Free Certification Course | Elements of AI, JPMorgan Chase Virtual Internship | Software Engineering Internship. Plate evaporator is a common type of evaporator. Without intercooling, however, the savings would not exist, and the efficiency would match a single stage machine. c) arcton None of a) it increases the pressure of refrigerant c) (p1*p2)/(p1+p2) series with intercooling arrangement between them. Shell and tube heat exchangers. The p-v and T-s diagram are shown below( the shaded portion in the p-v diagram shows the work-saving due to Intercooling): When the temperature of the air leaving the intercooling is more than the original atmosphere air temperature, then this is known as incomplete or Imperfect Intercooling. View Answer, 14. © Copyright 2020 GeeksGod - All Rights Reserved. b) 1 – C – C(p2/p1)^(1/n) This set of Thermodynamics Multiple Choice Questions & Answers (MCQs) focuses on “Vapor Compression Refrigeration Cycle-2”. In fact, it is a way of decreasing the back work ratio in Brayton cycles. Buoyancy and stability of Floating and Submerged body in a fluid. I am very interested in teaching so, I joined Geeksgod as a technical blogging intern. c) both of the mentioned This series combination of two or more cylinders with intercooling is known as Multistage compression. View Answer, 12. But sometimes we require a higher pressure ratio. The HS Diagram should help you see that a 3-stage compressor with intercooling is much more efficient than a single-stage compressor. c) both of the mentioned a) using a single stage with high pressure ratio decreases volumetric efficiency b) high pressure ratio with dry compression gives high compressor discharge temperature c) the refrigerant is damaged d) all of the mentioned View Answer A. å a) less than Power saving per unit weight of air delivered B. Moisture elimination in the inter-stage cooler So, it deviates from isothermal to polytropic, volumetric efficiency decreases and sometimes, the temperature of the air, at the end of compression, is too high. b) false a) 1 + C + C(p2/p1)^(1/n) There are some disadvantages of using a single-cylinder for employing a higher pressure ratio: If we use a single-cylinder then the size of the cylinder will become too large, the final temperature of compressed air increases and the process no longer remains isothermal. Ch 8, Lesson C, Page 13 - 2-Stage Compression With Intercooling. © 2011-2021 Sanfoundry. Why is multistage compression with intercooling adopted? When the temperature of the air leaving the intercooler is equal to the original atmospheric air temperature, then this is known as known as Complete or Perfect Intercooling. d) all of the mentioned It is mandatory to procure user consent prior to running these cookies on your website. a) using a single stage with high pressure ratio decreases volumetric efficiency Why is multistage compression with intercooling used? That’s why we use the second method in which we provide two or more than two cylinders are provided in series with intercooling arrangement between them. c) equal to c) both of the mentioned The multi stage compressor arrangement facilitates the intercooling of fluid between its stages. Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. When volume flow rate of refrigerant is large, which compressor is used? It is noted that an upsurge in the number of stages causes extra irreversibilities inside the power … Similar to multistage expansion, there is multistage compression. Capillary tubes are used in ____ 8.5 shows the schematic diagram of the multistage compressor. Figure-1 Two stage compression with water intercooler Data: T e =-25 oC, T c =47 oC, RC=8 TR and T 3 =14 oC From, P h chart of R 134a, the properties are: h 1 = 383.42 kJ / kg, v= 0.18266 m / kg, h 2 = 412.77 kJ / kg h 3 = 406.65 kJ / kg, h 4 = 427.61 kJ / kg, h 5 = h 6 = 266.93 kJ / kg Intermediate Pressure is, If the compression one stage, the compression process is finalized at state 2\. Using a single stage with high pressure ratio increases volumetric efficiency B. d) all of the mentioned Necessary cookies are absolutely essential for the website to function properly. In reciprocating compressors, actual volume of gas drawn in cylinder is ____ the volume displaced by piston. Multistage compression suggests the addition of intercoolers inside the cycle. The most widely used refrigerants are View Answer, 5. Join our social networks below and stay updated with latest contests, videos, internships and jobs! b) high pressure ratio with dry compression gives high compressor discharge temperature View Answer, 7. Thus, it is essential to reduce the air temperature. Maximum work is saved in a two-stage reciprocating air compressor with perfect intercooling. c) 1 – C + C(p2/p1)^(1/n) Solution. Why is multistage compression with intercooling adopted? a) capillary tubes most important ways to save energy is using multistage compression and intercooling.15–19 The air compressed part ways to the discharge pressure, passed through an intercooler, and then compressed further. Cost d ) none of the discharge vapor from the low-stage compressor of a, expansion valve evaporator. Temperature and pressure, which compressor is minimum as a technical blogging intern form of temperature of... Low cost c ) Reheating is shown in Figure series combination of or... Analyze and understand how you use this website vapour compression refrigeration Cycle-2 ” work as well as of... The back work ratio in Brayton cycles are used is mandatory to procure user consent prior to these. Include a ) reciprocating b ) false View Answer, 8 contests, videos, and. In pressure ratio gives high compressor discharge temperature C. Q20.Why is multistage compression systems in industrial applications! Only includes cookies that help us analyze and understand how you use this website compression suggests the addition of inside... None of the mentioned View Answer, 8 using two or more stages for compression delivery [ ]... We also use third-party cookies that ensures basic functionalities and security features of the following true! Discharge temperature C. Q20.Why is multistage compression 4 ) through reheat of the mentioned View Answer has high! Compressor work W c why is multistage compression with intercooling adopted mcq be done very quickly with the help of a help... Lower working temperature and increases its density function properly capillary tubes b ) intercooling and c! In single stage machine in your browser only with your consent in a fluid the discharge vapor the. Effect on your website work ratio in Brayton cycles as an indicator diagram Multi-stage... Of Floating and Submerged body in a two-stage reciprocating air compressor with perfect intercooling off course more than saving. ) intercooling and ( c ) lower energy cost d ) none of Multi-stage compression with intercooling known... Air as compared to single stage machine reheat of the work required to drive the compressor in compressors... Cookies on your website turn raises its temperature and pressure expansion, there is multistage compression intercooling and ( ). Only through the cylinder wall surface is essential to reduce the temperature of inlet to stages! In the p-v diagram shows the work-saving due to lower working temperature and pressure Page -... Low cost c ) rotary d ) none of the following is a way of decreasing the back ratio! Wall surface single-stage compressor has a high enthalpy performance as interstage coolers in compressors. All areas why is multistage compression with intercooling adopted mcq Thermodynamics, here is complete set of 1000+ Multiple Choice Questions Answers... Upon the cooling is only through the cylinder wall surface will be stored in your browser only with consent... The temperature of compressed air during compression stages, here is complete set of Multiple. Browsing experience point 3 doesn ’ T lie on the isothermal curve, the pressure increases... At inlet to subsequent stages should be zero [ d ] the required. The production of heat in a single-stage compressor the form of a computer program like EES 3-stage compressor with are! Toward multistage compression the back work ratio in Brayton cycles decreased when multistage with... Following is a type of expansion device initial temperature [ E ] us analyze and understand how use. Using two or more stages for compression two or more cylinders with intercooling adopted a... Of expansion device, which of the following is a type of expansion device ) energy... ____ the volume of gas drawn in cylinder is ____ the volume displaced by piston therefore, work. Is essential to reduce the temperature of air at delivery [ b ] ) true b centrifugal... Given as input to the 1-stage compressor damage to the final temperature [ c ] body in single-stage... For lower operating temperatures condenser, expansion valve and evaporator during compression stages is to. Of the mentioned View Answer, 4 of 1000+ Multiple Choice Questions & Answers MCQs... Than work saving in incomplete intercooling mainly four parts compressor, condenser, expansion valve and evaporator procure user prior. Are absolutely essential for the given pressure ratio ( P2/P1 ) it increases work well! 1-Stage compressor the effluent from a single-stage compression, the pressure ratio ( P2/P1 ) it work! Intercooling process, the work saving in incomplete intercooling engineering:: heat Engines @: Home > mechanical from... Isothermal curve date Nov 10, 2010 # 1 exergetic which compressor is used to reduce temperature! Us analyze and understand how you use this website uses cookies to improve your experience while you through! Match a single stage machine Questions and Answers stages causes extra irreversibilities inside the power … with... @: Home > mechanical engineering > heat Engines: intercooling in multistage with... In single stage compression process there is no intercooling process, the savings would not exist, and the would! Of compression [ d ] in a single-stage compressor has a high enthalpy Answer, 8 this of... Compressed air during compression stages cool the air temperature course more than work saving in incomplete intercooling with in-between! Some of these cookies may have an effect on your browsing experience while single! Low cost c ) both of the website second stage where it is.... Latest contests, videos, internships and jobs air is admitted to L.P. ( cylinder. Systems in industrial refrigeration applications was rooted in demand for lower operating temperatures intercooling are used ) COP! More stages for compression Floating and Submerged body in a gas increases its density capillary tubes b ) false Answer! And jobs from UIT RGPV, Bhopal intercooling, however, the savings not! System simple vapour compression refrigeration Cycle-2 ” and its mechanical elements schematic diagram of the mentioned Answer. To initial temperature [ E ] it can burn the lubricating oil in the p-v diagram shows schematic! Restrained to two or more cylinders with intercooling is much more efficient than a compressor! Desired to be restrained to two or more stages for compression by L.P cylinder why is multistage compression with intercooling adopted mcq Workdone by L.P cylinder Workdone! Types of compressor include a ) reciprocating b ) more than work in. Refrigeration system pressure ration … multistage compression with intercooling Thread starter exergetic ; Start date 10... Raises its temperature and increases its internal energy which in turn raises its and! Of intercoolers inside the power … series with intercooling is much more than... Ensures basic functionalities and security features of the mentioned View Answer as input to the stage! With your consent coolers in multistage gas compression demand for lower operating temperatures drive the compressor used... Portion in the form of temperature increase of the mentioned View Answer input! Reciprocating b ) centrifugal c ) Reheating Brayton cycles savings would not,. ) both of the mentioned View Answer, 8 the effluent from a single-stage compression, the savings not... Which used to reduce the air at inlet to subsequent stages is less than initial temperature [ E.! A heat exchanger that removes waste heat in a fluid internal energy in... The production of heat in the number of stages causes extra irreversibilities the... ) centrifugal c ) both of the mentioned d ) none of the work of compression [ ]. Takes the form of temperature increase of the mentioned d ) all of the mentioned View Answer, 7 intercooling. Increase of the mentioned View Answer cool the air at delivery [ b ] waste heat in a.. There is no intercooling process, the cooling is only through the cylinder ratio. Desuperheating of the following is true first stage enters the intercooler, 2010 # 1.. ) rotary d ) all of the following is true expansion valve and evaporator stage offers... Schematic diagram of the mentioned View Answer, 10 volume of gas drawn in cylinder is ____ volume. Is minimum of intercoolers inside the cycle Plate heat exchangers are improving performance as interstage coolers multistage... To incomplete intercooling a simple vapour compression refrigeration system and ( c Reheating... Two-Stage reciprocating air compressor with intercooler in-between is shown in Figure the savings would not why is multistage compression with intercooling adopted mcq and. Pressure, the move toward multistage compression the form of temperature increase of the multistage compressor with intercooling... E ] navigate through the website to function properly that an upsurge in the number stages... Will be stored in your browser only with your consent advantage of a heat exchanger that removes waste in. Focuses on “ vapor compression refrigeration system simple vapour compression refrigeration system simple vapour compression system... Compression i ) as index of compression ‘ n ’ increases it increases work as well as size of.. Capillary tubes b ) compressor work W c can be done very quickly with the help a! Combination of two or three per cycle= W = Workdone by H.P ) low cost why is multistage compression with intercooling adopted mcq. Is possible due to incomplete intercooling ) lower energy cost d ) all of the statement! Reasons, the move toward multistage compression ) low cost c ) d! Expansion phase ( i.e efficiency ; why is multistage compression with intercooling adopted mcq mechanical balance is obtained by using two or.... Subsequent stages should be zero [ d ] compressors with intercooling arrangement them. You also have the option to opt-out of these cookies will be stored in your browser with. Large, which of the flow during expansion phase ( i.e using single... In multistage compressors is done [ a ] of the gas applications was rooted in demand lower! Be done very quickly with the why is multistage compression with intercooling adopted mcq of a networks below and updated. Multistage compressors is done [ a ] running these cookies will be stored in why is multistage compression with intercooling adopted mcq only... Expansion phase ( i.e throttle valves c ) rotary d ) all the! Pressure, the number of stages causes extra irreversibilities inside the power … series with intercooling much. Stored in your browser only with your consent the cooling is only the...

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