The change in evaporator temperature in a refrigeration cycle, as compared to change in condenser temperature, influences the value of C.O.P. (d) gas liquefaction Ans: a (a) more Ans: b (c) after passing through the expansion or throttle valve 1) Cooling Glasses , 2) Space Craft , 3) Atom Bomb , 4) Detecting Scanners When you pull out the plug connected to an electrical appliance, you often observe a spark. (e) Hydrocarbon refrigerant. Pick up the wrong statement. Mechanical Engineering Refrigeration and Air Conditioning Important MCQ, 1. (d) expansion valve. (d) triple point of compressor required will be (b) 50 kcal/kr (a) 211 kJ/min (c) saturated liquid of a refrigeration cycle with lowering of condenser temperature, keeping the evaporator temperature constant, will (a) a gas will never liquefy (a) Increases 3. (e) lithium bromide is driven out of solution. (d) toxic Ans: c (d) 6 (c) Freon-22 (b) higher than atmospheric pressure Ans: c (e) critical point. (e) refrigerant is circulated in a refrigeration system to transfer heat. Allowable pressure on high-pressure side or ammonia absorption system is of the order of 1. (b) Increases (b) Decreases (c) less 56. D. Atmospheric noise . 51. (e) ammonia. (d) the refrigeration effect to produce 1 ton of ice at NTP conditions (Ans:c), In vapor compression refrigeration, cooling effect is produced by 53. (a) after passing through the condenser (e) volume lines. (a) after passing through the condenser (b) voltage rating. 45. (d) condenser discharge (c) Remains the same (e) temperature, pressure, specific volur and’enthalpy. (b) reduce compressor discharge temperature (b) evaporator tubes (d) all of the above (b) Desire able Rating of a domestic refrigerator is of the order of Brain Vasodilatation effect of CO2 is … (b) Expansion valve (a) Increases (d) weak solution mixes with strong solution (b) 1 : 9 In vapour compression cycle, the condition of refrigerant is very wet vapour EVS MCQ questions are very helpful different type of competitive ex Page-2 section-1. Magnetic effect of current C. Lighting effect of current D. Heating effect of current 39. (e) condensing temperature of ice. (b) maximum work input Which of the following statement is incorrect about agar? (c) much above critical pressure ... Q5.What is the effect of change in outer radius of the hollow cylinder on the thermal resistance of conduction? The cooling effect produced by melting 1 ton of ice. (d) more/less depending on rating (d) smaller/bigger depending on capacity (e) 3 : 1 (d) zero work input (a) Ammonia (c) Inlet of expansion valve (a) Increases (c) refrigerant cooling tubes All MCQs are important for exams as well as school tests. View EE,UNIT 2,MCQ.xlsx from MECHANICAL ENGR6911 at Sultan Qaboos University. b) The saturation voltage V CE for germanium transistor is more than silicon transistor. 64. rick up the incorrect statement (d) condenser and absorber (c) Remains the same [Both a and b] 7 people answered this MCQ question is the answer among Both a and b for the mcq Double line effect is produced by (e) dual cycle. The boiling point of ammonia is ... the heating effect will be: A. (d) depends upon the make The general rule for rating refrigeration systems (excepting for C02 system) is to approximate following h.p. At unity load power factor, the effect of armature reaction on the main-field flux of an alternator is (a) nominal. (d) non-toxic and inflammable (c) Remains same (c) 50% (b) increases heat transfer rate 54. Superheating in a refrigeration cycle (d) None Superheating in … MCQ on Refrigerator & AC 51-105 51. (b) demagnetizing. Magnetic effect of current was discovered by (a) Oersted (b) Faraday (c) Bohr (d) Ampere (a) Oersted. (e) unpredictable. (a) results in loss of heat due to poor heat transfer Refrigeration & Air-Conditioning MCQ Question with Answer Refrigeration & Air-Conditioning MCQ with detailed explanation for interview, entrance and competitive exams. (b) low boiling point Ans: b (e) under some conditions small and under some conditions high. The Peltier effect is the presence of heating or cooling at an electrified junction of two different conductors and is named after French physicist Jean Charles Athanase Peltier, who discovered it in 1834. (a) 50 kcal/min Water MCQ Questions and Answers Quiz. Your name: ... More Mcq. Ans: c (a) after passing through the condenser In a vapour compression cycle, the refrigerant immediately after expansion valve is (a) 0.1 ton (Ans: b), With the increase of discharge pressure, the refrigerating effect (a) 0.2 D Emulsification . (a) condensation of the refrigerant vapour 84. 1700°C. (b) work done by compressor CBSE Class 10 Science Book Chapter 12 “Electricity” Multiple Choice Questions ‌(MCQs‌) with Answers. The synchronous generator is found at power stations where it is synchronized with the turbine. (a) actual COP/fheoretical COP (a) ineffective refrigeration (a) saturation point of vapour (a) after passing through the condenser (c) Increase of pressure and volume (d) other factors decide COP (b) above critical temperature (a) Decreases (b) 5 tons (c) takes place at constant entropy (d) None (c) C02 In mottled cast iron, slow cooling rate is used to obtain _____ a. white cast iron b. gray cast iron c. Both a. and b. d. None of the above. (b) evaporator (b) will be lower In vapour compression cycle the condition off refrigerant is dry saturated vapour 46. 10%. (e) Refrigerant is inside the lubes in case of a direct-expansion chiller. (a) -100°C Ans: d (c) magnetising. 60. (e) 10. Subject: Heat Transfer 2. (c) Carnot cycle (a) noisy operation 15. (b) 25% Ans: a (d) above which liquid becomes solid B It has insufficient cooling effect. Which of the following is not true about the disadvantages of tuned radio frequency receiver? Tags: Question 4 SURVEY 30 seconds Q. Which of the following is not correctly matched- (a) Brazil current South Atlantic Ocea (b) Humbolt current North Pacific Ocean (c) Gulf Stream North Atlantic Ocean (d) Agulhas Current Indian Ocean Answer. (d) None d) Wick feed lubricator . (e) in 10 hours. (a) > 4 (a) lithium bromide used in vapour absorption cycle is nonvolatile (a) it permits higher speeds to be used Polarity of (b) as low as possible (3 to 11°C) (e) unperdictable. (d) low latent heat 89. (c) Vapor absorption cycle A standard ice point temperature corresponds to the temperature of (e) refrigerant with high boiling point must be used. 78. (c) carnot cycle 47. (Ans:a), The Cop of a heat pump is 20. During combustion in the engine, temperature in the cylinder raises up to. (d) refrigerant with lower evaporation temperature should be used 41. (c) >10 MCQ quiz on Water multiple choice questions and answers on water MCQ questions quiz on water objectives questions with answer test pdf. Ans: d (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 (d) low pressure side near receiver for the production of liquid oxygen, nitrogen, and argon). (e) 100 tons. The refrigeration effect in a dry evaporator compared to flooded evaporator in a similar plant is Engines): MCQ question is the important chapter for a Mechanical Engineering and GATE students. (c) Remains same (a) compressor (d) absorption Ans: d (b) Increase of pressure Ans: a (c) Remains same Ans: a Explanation are given for understanding. (b) Decreases The C.O.P. (e) anywhere in the cycle. (e) 7-10 bars. (d) collect vapours (b) decreases COF 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 (c) using reagents (e) throttling device. All Exam Review. (e) none of the above. (b) before passing through the condensei (b) <1 Practice with these objective questions to score more in your terminal exams or unit tests. 48. Ans: d (b) always more than unity Ans: d (a) 10% Ans: c Chemical effect of current B. Because almost all of the heat is produced at the surface, the eddy (b) safety relief valve (b) in 1 minute (b) NH3 (d) None (a) Increases Which of the following statement is true? (b) before passing through the condenser (a) after passing through the condenser Ans: d In S.J. (c) Zero (d) entropy lines (e) none of the above. The domestic refrigerator uses following type of compressor (d) None In fact, aliasing is the phenomenon in which a high frequency component in the frequency-spectrum of the signal takes identity of a lower-frequency component in the spectrum of the sampled … (a) condenser tubes (e) before entering the compressor. (b) Rankine cycle d) The saturation voltage V CE. (c) high pressure side close to receiver (d) Brayton Freon group of refrigerants are One ton refrigeratiqn corresponds to (a) Increases ... 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. Induced voltage by the applied magnetic field C. 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