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Ans: e 1. (b) Bell Coleman cycle D. Ozone gas is produced View Answer C. Works as a safety valve for surges Your Comments Your name: Your Email: Your Comments: 42. Lubricants Objective Type Questions and Answers for competitive exams. (b) voltage rating. d. 40%. (c) Remains same (b) before passing through the condensei Brain Vasodilatation effect of CO2 is … All Exam Review. (a) compressor (e) S02. 24. (d) expansion valve per ton of refrigeration (d) condenser discharge (d) None (Ans: a), As evaporator pressure decreases in vapor compression refrigeration, COP (a) above which liquid will remain liquid 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). Ans: a One ton of refrigeration is the heat removal at the rate of Refrigeration; Steam Engine; Steam Boiler; Steam Turbine; Steam Condenser; Steam Nozzle; Power Plant; Thermodynamics; … Since refrigerant is boiled, its form is changing from fluid to vapor (evaporation process). The arc can be produced by either AC or DC current. For proper parallel operation, 3-phase alternators must have the same (a) speed. (a) lithium bromide used in vapour absorption cycle is nonvolatile Accumulators should have adequate volume to store refrigerant charge at least One ton refrigeratiqn corresponds to 86. (d) 40 tons (d) takes place at constant enthalpy (d) very little power consumption (b) slightly above atmospheric pressure (c) magnetising. NEET MCQ tissue-culture PDF:-Download the PDF Here. (d) non-toxic and inflammable 16. (c) compression of the refrigerant vapour (c) may increase or decrease depending on the type of refrigerant used (c) All solar thermally operated absorption systems are capable only of intermittent operation 71. The value of COP in vapour compression cycle is usually 45. (e) Brayton cycle. Ans: b (e) none of the above. Ans: c (d) None (e) unpredictable. (b) high power consumption c. 30%. (c) optimum The cooling effect produced by melting 1 ton of ice. (b) If operating temperature of system is low, then refrigerant with low boiling point should be used In Florey and Chain's experiment, eight mice were infected with lethal doses of Streptococcus bacteria. Professionals, Teachers, Students and Kids Trivia Quizzes to test your knowledge on the subject. ii) Effect of sub-cooling: sub-cooling is the process of cooling the liquid refrigerant below the condensing temperature for a given pressure. 87. Electric current is produced B. (c) after passing through the expansion or throttle valve (a) decreases (d) above which liquid becomes solid C. The refrigeration effect to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours. (b) theoretical COP/actual COP In motorcycles, the following type of cooling system … 1. (d) collect vapours (e) 5 to 10 h.p. On the pressure-enthalpy diagram, condensation and desuperheating is represented by a horizontal line because the process (a) will be higher (a) increase (Ans:a), The cooling effect is higher in a (d) electrolux refrigerator Which of the following is … (b) NH3 38. (c) Remains same (b) takes place at constant temperature (d) None Given below are basic MCQ (with answers) on Synchronous Generator. (c) constant total heat lines At unity load power factor, the effect of armature reaction on the main-field flux of an alternator is (a) nominal. 48. (e) none of the above. The refrigerant used is In a refrigeration system, heat absorbed in comparison to heat rejected is (e) weak solution in liquid heat exchanger gives up heat to the strong solution. Q17. (b) 50 kcal/kr (d) temperature, pressure, and specil volume (d) None (b) above critical temperature 4. (b) saturation point of liquid MCQ Questions for Class 11 Chemistry with Answers were prepared based on the latest exam pattern. (c) remain unaffected (e) in 10 hours. The condensing pressure due to the presence of non-condensable gases, as compared to that actually required for condensing temperatures without non-condensable gases, Zero power factor method […] Air refrigeration cycle is used in Cooling capacity is the cooling produced per minute. All MCQs are important for exams as well as school tests. (d) more or less depending on ambient conditions (c) Reversed Rankine (c) non-inflammable and toxic C The refrigeration effect to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours . (d) S02 (d) capillary tubes QUESTION: 9. 56. (e) constant volume lines. (d) expansion valve (c) COP remains unaltered (a) Vapor compression cycle Ans: a Highest temperature encountered in refrigeration cycle should be (b) Increases (e) none of the above. (e) decreases compressor power. (e) none of the above. Ans: d (c) kVA rating. (e) none of the above. Ans: a (c) >10 18. (d) None These short objective type questions with answers are very important for Board exams as well as competitive exams. In vapour compression cycle the condition of refrigerant is superheated vapour (b) manually operated valve (a) vapour compression (d) before entering the expansion valve 84. (c) solid and dry ice (a) halide torch which on detection produces greenish flame lighting (c) Remains same d) Wick feed lubricator . (a) Increases (a) > 4 (b) it permits complete evaporation in the evaporator (a) 0.1 to 0.5 h.p. (c) strong solution to ammonia vapour 25. (d) None (a) less than 2 kg The boiling point of ammonia is Answer: Option C (c) at critica. ... Q5.What is the effect of change in outer radius of the hollow cylinder on the thermal resistance of conduction? Ans: b (d) other factors decide COP 88. 75. Mass flow ratio of NH3 in comparison to Freon-12 for same refrigeration load and same temperature limits is of the order of (a) -100°C (b) Total heat 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. (c) perfectly tight vapour seal should be used (a) collect liquid refrigerant and prevent it from going to compressor (d) large latent heat (a) electrically operated throttling valve Subscribe to our mailing list and get interesting stuff and updates to your email inbox. During combustion in the engine, temperature in the cylinder raises up to. Ans: a (c) toxic and non-inflammable At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant Ans: c (a) > 4 Ans: d A standard ice point temperature corresponds to the temperature of Refrigeration & Air-Conditioning MCQ Question with Answer Refrigeration & Air-Conditioning MCQ with detailed explanation for interview, entrance and competitive exams. Ans: b (a) high, of the order of 25° (c) equally. The change in evaporator temperature in a refrigeration cycle, as compared to change in condenser temperature, influences the value of C.O.P. A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of- 23°C. 47. (a) Decreases (b) compressor and evaporator Home >> Category >> Mechanical Engineering (MCQ) questions and answers Dear Readers, Welcome to Thermodynamics multiple choice questions and answers with explanation. (d) None (a) Increases What gas from the list below is a cause for global warming? For better COP of refrigerator, the pressure range corresponding to temperature in evaporator and condenser must be Clapeyron equation is a relation between Ans: a (d) 75% a. Ans: c (Ans:a), Cooling effect is produced in the (b) lithium bromide plant can’t operate below 0°C (c) takes place at constant entropy In figure the process of sub-cooling is shown by 2’-3’. (c) equal to unity 1. 61. (a) involves no change in volume (d) more/less depending on size of plant Ans: c (b) less 85. Lets Crack Online Exam Mechanical Engineering MCQ Question Papers: DRDO, ISRO, Interview Subject: Heat Transfer 2 Part 2: List for questions and answers of Heat Transfer Q1.Thermal conductivity of the same (Ans: a), In gas refrigeration, cooling effect is produced by It has an insufficient cooling effect Due to the high cooling effect, the cutting edges of the tool break off 11) Which one of the following frictions occurs in an un-lubricated journal bearing? (d) 1 : 3 Vapour compression refrigeration is some what like In vapour compression cycle, the condition of refrigerant is high pressure saturated liquid (Ans:c), In vapor compression refrigeration, cooling effect is produced by Magnetic effect of current was discovered by (a) Oersted (b) Faraday (c) Bohr (d) Ampere (a) Oersted. (d) the refrigeration effect to produce 1 ton of ice at NTP conditions In vapour compression cycle, the condition of refrigerant is very wet vapour 89. In vapour compression cycle, the conditii of refrigerant is saturated liquid Presence of moisture in a refrigerant affects the working of Ans: a (b) direct Formation of frost on evaporator in refrigerator The CP of standard source ∝ L 1 2. (c) Remains the same (b) Decreases (a) condenser tubes (a) 10% (d) 0.25 (b) in 1 minute 15. 62. Free PDF Download of CBSE Class 10 Science Chapter 13 Magnetic Effects of Electric Current Multiple Choice Questions with Answers. 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. (d) 5-6 bars (d) Bell-coleman 8. (a) noisy operation A toxic substance produced by biological system is specially referred to as a -----a) toxicant. (d) refrigerant with lower evaporation temperature should be used Internal Combustion Engines (I.C. (d) None (a) a gas will never liquefy Ans: c. ... the cooling effect produced by melting 1 ton of ice (c) the … (d) toxic (c) lithium bromide mixes with ammonia Ans: a (e) condensing temperature of ice. Multiple Choice Question (MCQ) of Electronics page-15:211. 3) An aqueous suspension at 60 C is fed to the first effect of a double effect forward feed evaporator with a mass flow rate of 1.25 kg/s. In vapour compression cycle using NH3 as refrigerant, initial charge is filled at Ans: d 92. (c) Remains same (a) after passing through the condenser Ans: c 73. (a) more Ans: c Vertical lines on pressure-enthalpy chart show constant Mechanical Engineering Refrigeration and Air Conditioning Important MCQ 1. (b) as low as possible (3 to 11°C) (c) saturated liquid As is evident from the figure the effect of sub-cooling is to increase the refrigerating effect. 72. Ans: e (b) less (b) evaporation of the refrigerant liquid Ans: d Ans: e 4. The cooling of Earth due to air pollution. (a) Increases When an electric current is passed through a circuit of a thermocouple, heat is evolved at one junction and absorbed at the other junction. (e) sensing reduction in pressure. (a) receiver Effect of friction torque is more pronounced a) When the drive is running on full speed b) When the drive is being started c) When the drive is being stopped d) When the drive at half of its normal speed Q18. 91. Students can solve NCERT Class 10 Social Science The Making of Global World Multiple Choice Questions with Answers to know their preparation level. Ans: c Refrigeration & Air-Conditioning MCQ with detailed explanation for interview, entrance and competitive exams. The evolution of heat of solution takes place in ammonia absorption plant when Fig.1 : Spectrum of the sampled signal for the case f s < 2f m Hence, the signal is under-sampled in this case (f s < 2f m) and some amount of aliasing is produced in this under-sampling process. (b) of freezing zone Ans: a (a) Freon-12 34. (d) None The best example for splash lubrication is . Which of the following cycles uses air as the refrigerant The draught produced by steel chimney as compared to that produced by brick chimney for the same height is (a) less (b) more (c) same (d) may be more or less. An important characteristic of absorption system of refrigeration is (a) Ammonia (c) Sensible heat Ans: e (d) wet vapour Ans: b Ans: a ASWDC (App, Software & Website Development Center) Darshan (b) constant temperature lines The lower horizontal line of the refrigeration cycle plotted on pressure-enthalpy-diagram represents 26. for the production of liquid oxygen, nitrogen, and argon). (c) is immaterial (c) Remains same (b) sub-cooled liquid (e) none of the above. (c) carnot cycle (b) Stirling Explanation are given for understanding. (b) decreases COP (d) more/less depending on rating The C.O.P. C. noise killing . (e) before entering the compressor. 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. (c) same (c) Freon Ans: b Steam-jet water vapor refrigeration is used for creating temperatures (a) Above O o C (b) Below O o C (c) O o C (d) None (Ans: a) Steam vapors follow (a) Perfect gas equation (b) Boyle’s Law (c) Charles Law (d) None (Ans: d) In steam-jet refrigeration, cooling effect is produced by (a) Latent heat (b) Total heat (c) Sensible heat (d) None … (d) None 60. (a) more 37. 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. MCQ-NON CONVENTIONAL REFRIGERATION. (b) Inlet of evaporator (a) very little work input (d) all of the above Q7. (c) remains same In S.J. (c) Rankine cycle (a) lower than atmospheric pressure (a) Inlet of compressor (b) ammonia vapour is driven out of solution (d) capillary tube (b) safety relief valve CBSE Class 7 Science Electric current and its Effects MCQs.Revision worksheets, Sample papers, Question banks and easy to learn study notes for all classes and subjects based on CBSE and NCERT Electric current and its Effects guidelines. (d) absorption Practice with these objective questions to score more in your terminal exams or unit tests. (b) less 94. Refrigeration & Air Conditioning (2161908) Department of Mechanical Engineering Darshan Institute of Engineering & Technology, Rajkot 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 ANSWER: C 46. The cooling effect produced by melting 1 ton of ice . (c) much above critical pressure 33. (a) High (d) smelling Cooling effect is caused by latent heat in vapor refrigeration while by sensible heat in gas refrigeration. (b) high total heat (c) sublimation temperature b) toxin . Light is produced C. Heat is produced D. Air is produced . (c) 5 28. Q10. (d) None (b) Reversed Carnot cycle 44. (c) above which liquid becomes vapour (e) expansion valve CBSE Class 10 Science Book Chapter 12 “Electricity” Multiple Choice Questions ‌(MCQs‌) with Answers. In gas refrigeration, COP is 54. Pick up the wrong statement. (b) 25% (d) distortional. Clapeyron equation is applicable for registration at (a) centrifugal (d) entropy lines The CP of … (e) unpredictable. Freon group of refrigerants are Critical temperature is’ the temperature above which 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. Ans: d (b) before passing through the condenser 79. (d) compressor and condenser (a) bigger (a) in 1 hour (d) Brine « Back CONTENTS Next » 1. Ans: e (a) Ericsson (d) reduces weight displaced by piston unit, one ton of refrigeration is equal to (c) equal to atmospheric pressure Class 10 Science Chapter 13 MCQ (Multiple Choice Questions) of Magnetic Effects of Electric Current. (b) Bell column cycle roofs of buildings; tall water towers; town level; high lands (c) high pressure side close to receiver (c) after passing through the expansion throttle valve Solution: (COP) Heat pump = (COP) refrigerator + 1 = 4 + 1 = 5. A pinoybix mcq, quiz and reviewers. (d) None 73. (d) driers (c) air conditioning (a) atmospheric pressure 14. (e) none of the above. (d) metering of the refrigerant liquid (e) unpredictable. temperature 1. (c) the refrigeration effect to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours 25. (b) 1.2 (b) non-inflammable (b) a gas will immediately liquefy 20%. (e) such a cycle does not exist. White noise . (c) 2-4 bars These objective type Thermodynamics questions are very important for campus placement test, semester exams, job interviews and competitive exams like GATE, IES, PSU, NET/SET/JRF, UPSC and diploma. Learn Internal Combustion Engines (I.C. (a) pressure lines 35. If the- cycle direction be reversed, what will be the value of COP of reversed Carnot cycle (c) good electrical conductor A. D. Atmospheric noise . b) Wick feed lubricator . (1 ton = 211kJ/min of cooling effect). Pick up the wrong statement. (b) axial (b) 1 : 9 (e) 100%. (a) Rankine (a) condensation of the refrigerant vapour Ans: e (d) None Refrigeration is measured in tons of refrigeration. (e) volume lines. Magnetic Effect of Electric Current Class 10 MCQ Question 1. In refrigerator, liquid receiver is required between condenser and flow controlling device, if quantity of refrigerant for system is d) The saturation voltage V CE. Cooling capacity is the cooling produced per minute. Highest pressure encountered in a refrigeration system should be 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 … (d) Superheat and sensible heat of a. refrigerant are same Ans: d (a) same (Ans: b), To improve the COP of a refrigeration system, the super heating in the evaporator should be (e) before entering the compressor. (b) always more than unity (e) temperature, pressure, specific volur and’enthalpy. (a) Decreases Water MCQ Questions and Answers Quiz. B. anitnoise . 57. Ans: c The pattern of the magnetic field produced by the straight current carrying conducting wire is (a) in the direction opposite to the current (b) in the direction … 5. (c) Carnot cycle (c) after passing through the expansion or throttle valve (e) unpredictable. 2. Allowable pressure on high-pressure side or ammonia absorption system is of the order of 74. Ans: a (Ans: d) 10%. Home >> Category >> Mechanical Engineering (MCQ) questions and answers >> Cast Iron; 1) What is the effect of silicon on the structure of cast iron? (d) None (c) absorber (e) its input only in the form of heating. (a) Co2 (b) smaller Ans: b (b) more (Ans: b), High degree of super heat in vapor compression refrigeration, COP (b) < COP of a refrigerator 40. (c) 0.5 (c) 1 to 2 h.p. Ans: b (d) water will never evaporate MCQ Questions for Class 10 Magnetic Effect of Electric Current Question 10. (c) in 24 hours D. preemphasis . In an Internal Combustion engine, about _____ of the latent heat produced during combustion passes through the cylinder wall into the cooling system. Chemistry with Answers the applied magnetic field be determined Danger of corrosion... d Carry away the heat in. Magnetic field Lines Multiple Choice Question ( MCQ ) of Electronics page-15:211 and dehumidification process, c... 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