(a) domestic refrigerators Home >> Category >> Mechanical Engineering (MCQ) questions and answers Dear Readers, Welcome to Thermodynamics multiple choice questions and answers with explanation. Moisture in freon refrigeration system causes If the distances of the standard source S and the test source T from the photometer head are L 1 and L 2, respectively, then, according to the inverse square law, if the illumination on both the sides of the screen are equal then the candlepower of the source is proportional to the square of the distance between the source and the photometer head. (b) increases (c) Increase of pressure and volume A refrigerant should have (a) Tow specific heat of liquid (b) high boiling point (c) high latent heat of vaporisation (d) higher critical temperature (e) low specific volume of vapour. (a) atmospheric pressure 78. (d) gas liquefaction MCQ-VAPOR COMPRESSION REFRIGERATION-2 Most commonly used method of refrigeration is vapor compression refrigeration. (b) 21 kJ/min (a) of cooling medium Ans: e (e) none of the above. View Answer Answer: Danger of corrosion ... D Carry away the heat produced in bearing . www.gtu-mcq.com is an online portal for the preparation of the MCQ test of Degree and Diploma Engineering Students of the Gujarat Technological University Exam. Cooling capacity is the cooling produced per minute. (c) T12 — T22 5. (b) Decreases Ans: a (d) None (e) unperdictable. per ton of refrigeration In a filament type light bulb, most of the electric power consumed appears as: ... A. d. 3700°C. (a) will be higher (b) NH3 (c) Carnot cycle When a current is made to flow through a junction between two conductors, A and B, heat may be generated or removed at the junction. The effect of considering friction losses in steam nozzle for the same pressure ratio leads to (a) increase in exit velocity from the nozzle ... Nuclear Power Plant Multiple Choice Questions Multiple Choice Questions Nuclear Power Plant Multiple … (c) nearly same work input as for vapour compression cycle (e) expansion valve. Class 10 Social Science MCQs Chapter 4 The Making of Global World. (e) there is no such criterion. 18. (a) > 4 (a) 211 kJ/min (b) Increase of pressure 1. Ans: b (c) after passing through the expansion or throttle valve Ans: d (Ans:a), The condenser used in a small cooling capacity plant is, The condenser used in medium cooling capacity plant is, The condenser used in large cooling capacity plant is, Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window). (b) will be lower (d) compressor and condenser (b) Bell Coleman cycle 47. (c) solid and dry ice (e) refrigerant with high boiling point must be used. (e) dry vapour. (c) Reversed Rankine The COP of a domestic refrigerator (c) is immaterial The refrigeration effect in a dry evaporator compared to flooded evaporator in a similar plant is (c) miniature sealed unit (d) 1-actual COP x theoretical COP (d) may increase or decrease depending on the type of refrigerant used D. preemphasis . (a) Tow specific heat of liquid Ans: d 55. (a) condenser (d) capillary tube A standard ice point temperature corresponds to the temperature of (a) Increases 40. (d) None (b) Increases (c) Sensible heat (e) none of the above. (d) refrigerant with lower evaporation temperature should be used Students and parents can download free a collection of all study material issued by various best schools in India. Ans: a 6. 59. 92. (a) high triiscibility with oil (b) always more than unity The C.O.P. One of the purposes of sub-cooling the liquid refrigerant is to The refrigerant for a refrigerator should have 80. As is evident from the figure the effect of sub-cooling is to increase the refrigerating effect. (d) None (1 ton = 211kJ/min of cooling effect). 2.Which of the following is strongest magnet? for the production of liquid oxygen, nitrogen, and argon). (c) less Cooling tower effectiveness in percentage is the ratio of range, to the ideal range, i.e., difference between cooling water inlet temperature and ambient wet bulb temperature or in other words it is = Range / (Range + Approach). (a) more 44. www.gtu-mcq.com is an online portal for the preparation of the MCQ test of Degree and Diploma Engineering Students of the Gujarat Technological University Exam. (a) High Q17. (e) dual cycle. (b) before passing through the condenser (e) none of the above. 25. The strength of each of magnet reduces to half when it cut along its length into the equal parts magnetic field strength of a solenoid. (a) increase 66. (e) all of the above. 35. (b) <1 (a) > 4 Answer: (c) 2. Ans: c. ... the cooling effect produced by melting 1 ton of ice (c) the … (d) None (c) euqal B Specific gravity . (a) 0.1 ton Tags: Question 4 SURVEY 30 seconds Q. (c) at critica. Since refrigerant is boiled, its form is changing from fluid to vapor (evaporation process). (b) compressor and evaporator (e) 10. (a) less than 2 kg (d) more for small capacity and less for high capacity (c) toxic and non-inflammable per ton of refrigeration (c) Remains same (d) Superheat and sensible heat of a. refrigerant are same In motorcycles, the following type of cooling system … Mechanical Engineering MCQ Question Papers: DRDO, ISRO, Interview. 1700°C. (e) 5 to 10 h.p. ... the cooling effect produced by melting 1 ton of ice (c) the refrigeration effect to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours (d) the refrigeration effect to produce 1 ton of ice at NTP conditions (e) the refrigeration effect to produce 1 ton of ice in 1 hour time. Vertical lines on pressure-enthalpy chart show constant (a) a gas will never liquefy 10. Pick up the correct statement about giving up of heat from one medium to other in ammonia absorption system (d) 6 QUESTION: 9. Ans: c (c) optimum Where does the lowest temperature occur in a vapour compression cycle ? If the evaporator temperature of a plant is lowered, keeping the condenser temperature constant, the h.p. Ans: d (d) Freon-22 a) Oilcan . (e) 33.3°C. In figure the process of sub-cooling is shown by 2’-3’. (b) sulphur sticks which on detection gives white smoke (b) Rankine cycle (c) Remains the same An important characteristic of absorption system of refrigeration is 31. (a) reduce compressor overheating (Ans:c), In vapor compression refrigeration, cooling effect is produced by (c) same Refrigeration & Air-Conditioning MCQ with detailed explanation for interview, entrance and competitive exams. 1. Ans: b The vapour pressure of refrigerant should be (e) in 10 hours. 63. (a) pressure lines (c) Rankine cycle In vapour compression cycle, the condition of refrigerant is high pressure saturated liquid (Ans:b), In Cascade refrigeration, COP is (c) 211 BTU/min (c) same (b) Increases (b) takes place at constant temperature Which of the following is … Ans: b d- Creatine phosphate. (e) increase refrigeration effect. (c) in 24 hours (d) wet vapour Ans: c 39. Ans: b (b) much below critical pressure In Florey and Chain's experiment, eight mice were infected with lethal doses of Streptococcus bacteria. (a) ineffective refrigeration Ans: c Choose the wrong statement (d) None (e) S02. Refrigeration and Air Conditioning Multiple Choice Questions :-1. (d) the refrigeration effect to produce 1 ton of ice at NTP conditions (a) non-toxic (Ans: a), The use of a flash chamber in a multi-stage vapor compression refrigeration, (c) neither increases or decreases the COP, The COP is maximum for a 38. Ans: e (c) sublimation temperature c 2- The frequency needed to (d) more or less depending on ambient conditions Formation of frost on evaporator in refrigerator (c) indirect (c) evaparator ASWDC (App, Software & Website Development Center) Darshan (b) condenser B. anitnoise . The factors on which one magnetic field strength produced by current carrying solenoids depends are (a) Magnitude of current (b) Number of turns (c) Nature of core … (Ans: a), As evaporator pressure decreases in vapor compression refrigeration, the cooling effect (d) more/less depending on size of plant 4. (a) condenser and expansion valve (c) 5 (b) 1.2 68 Ammonia is Subject: Heat Transfer 2. (d) much below critical temperature The change in evaporator temperature in a refrigeration cycle, as compared to change in condenser temperature, influences the value of C.O.P. These short objective type questions with answers are very important for Board exams as well as competitive exams. 1. This contains 20 Multiple Choice Questions for Mechanical Engineering Heat Pump & Refrigeration Cycles And Systems - MCQ Test 1 (mcq) to study with solutions a complete question bank. (e) unpredictable. The CP of standard source ∝ L 1 2. Practice with these objective questions to score more in your terminal exams or unit tests. When an electric current is passed through a circuit of a thermocouple, heat is evolved at one junction and absorbed at the other junction. Ans: e (d) smelling This is known as the Peltier Effect. Polarity of 56. On the pressure-enthalpy diagram, condensation and desuperheating is represented by a horizontal line because the process MCQ in Noise Part 1 as part of the Communications Engineering (EST) Board Exam. (a) T1 + T2 (c) much above critical pressure (c) constant total heat lines (d) None (c) evaporator (d) expansion valve (a) 10% 12. (c) magnetising. (c) compressor (c) 10 tons (e) unpredictable. (Ans: d) of compressor required will be 1500°C. 3. (e) none of the above. (a) Boot strap air refrigeration cycle Ans: e (e) 3 : 1 Ans: c (a) ammonia vapour goes into solution a. Ans: b (d) None (b) Freon-22 (d) before entering the expansion valve (b) above critical temperature (d) 75% (c) refrigerant cooling tubes (b) < COP of a refrigerator (e) unpredictable. Water MCQ Questions and Answers Quiz. (b) Increases roofs of buildings; tall water towers; town level; high lands Answer: (a) low SHOW ANSWER 26. (a) always less than unity MCQs from Class 9 Science Chapter 1 - Matter in Our Surroundings are provided here to help students prepare for their upcoming Science exam. (d) collect vapours (b) a gas will immediately liquefy (e) 10. Ans: a (d) any one of the above (d) all of the above (c) a separator is used in lithium bromide plant to remove the unwanted water vapour by condensing How do you calculate evaporation loss in cooling tower? (e) constant volume lines. (b) more (b) safety relief valve (e) throttling device. (e) none of the above. (a) centrifugal « Back CONTENTS Next » 1. (a) 0.1 to 0.5 h.p. 11. (b) maximum work input (d) before [entering the expansion valve Mcq Added by: Mansoor-Ul-Haque Everyday Science Mcqs Here you will find the General Science Multiple Choice Questions Mcqs are from Biology, Chemistry, Physics and Atmospheric Studies. (e) none of the above. The chances of occurrence of corona are maximum during A. Humid weather B. One ton of the refrigeration is (A) The standard unit used in refrigeration problems (B) The cooling effect produced by melting 1 ton of ice (C) The refrigeration effect to freeze 1 ton of water at 0 C into ice at 0 C in 24 hours (D) The The coefficient of performance is the ratio of the refrigerant effect to the of a refrigeration cycle with lowering of condenser temperature, keeping the evaporator temperature constant, will Choose the correct statement 2. 69. (a) Increases (b) less (b) more Round the clock cooling of an apartment having a load of 300 MJ/day requires an air-conditioning plant of … MCQ-NON CONVENTIONAL REFRIGERATION. (e) none of the above. (e) before entering the compressor. Magnetic Effect of Electric Current Class 10 MCQ Question 1. (e) low sensible heat (e) non-inflammable. a. the initial state of the gas should lie in cooling region b. the initial state of the gas should lie in heating region c. the initial state of the gas should lie on inversion curve d. none of the above View Answer / Hide Answer b) toxin . 20. 34. (b) smaller cabinet should be used https://www.mesubjects.net/wp-admin/post.php?post=4410&action=edit       Open and Hermetically sealed compressor units, https://www.mesubjects.net/wp-admin/post.php?post=5067&action=edit      Refrigeration equipment-2, https://www.mesubjects.net/wp-admin/post.php?post=5065&action=edit      Refrigeration equipment-1, https://www.mesubjects.net/wp-admin/post.php?post=4194&action=edit       MCQ non-conventional refrigeration. (a) Ammonia (a) the standard unit used in refrigeration problems (c) it results in high volumetirc and mechanical efficiency Ans: c (b) Decreases (e) none of the above. b) Wick feed lubricator . (a) same (c) remains same (c) Remains same Multiple Choice Question (MCQ) of Electronics page-15:211. 5. (b) Decreases In an Internal Combustion engine, about _____ of the latent heat produced during combustion passes through the cylinder wall into the cooling system. 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