TYPES OF COOLING TOWERS CLASS NOTES FOR ENGINEERING Cooling towers cool the hot water from the condenser for reuse. A cooling tower reduces the cost of water used in condenser. Use of water in the condenser is for condensing refrigerant for medium cooling plants. Cooling tower is a special type of heat exchanger. In this, hot…
LIQUEFACTION OF GASES MULTIPLE CHOICE QUESTIONS (MCQ) WITH ANSWERS When a gas is at a lower than its inversion temperature, cooling occurs on expansion. Thus, must bring gases below inversion temperatures before liquefaction. 1. When air expands at room temperature (a) Produce heating (b) Cooling produces (c) Neither heating nor cooling produces (d) None (Ans:…
VAPOR COMPRESSION REFRIGERATION MULTIPLE CHOICE QUESTIONS (MCQ) WITH ANSWERS MCQ increases clarity and understanding. Most commonly used method of refrigeration is vapor compression refrigeration. Cooling capacity is the cooling produced per minute. Refrigeration is measured in tons of refrigeration (1 ton = 211kJ/min of cooling effect).Cooling effect is caused by latent heat in vapor refrigeration…
NON CONVENTIONAL REFRIGERATION MULTIPLE CHOICE QUESTIONS (MCQ) WITH ANSWERS MCQ makes the concept very clear. More MCQ may be practiced to improve knowledge further. Then, it is very useful in the design, construction and working of the system. 1. The materials of thermoelectric refrigeration systems should have: (a) High electrical and thermal…
CASCADE REFRIGERATION MULTIPLE CHOICE QUESTIONS (MCQ) WITH ANSWERS Cascade refrigeration is an extension of vapor compression refrigeration in order to achieve lower temperatures. There are independent refrigeration circuits using different refrigerants. These are interconnected. Two-three-four stage systems are in use. Fig. Two stage Cascade refrigeration Line diagram & its representation on p-h Chart 1. Cascade…
VAPOR ABSORPTION REFRIGERATION MULTIPLE CHOICE QUESTIONS WITH ANSWERS (MCQ) Vapor absorption refrigeration is like a vapor compression system. The means of compression are different. It causes refrigeration from heat. 1. Vapor absorption refrigeration uses (a) Mechanical energy (b) Electric energy (c) Kinetic energy (d) None (Ans: d) 2. Vapor absorption refrigeration uses (a) Mechanical energy…
VAPOR COMPRESSION REFRIGERATION QUESTION ANSWERS Question answers on basics of refrigeration increases the level of understanding very deeply. Compressor, condenser, receiver, evaporator are essential components of refrigeration. Condensing unit is motor, compressor, condenser and receiver. Different prime movers run refrigeration units. What is the meaning of condensing unit? Condensing unit is the assembly of motor,…
MCQ: SUPER HEATING AND SUB COOLING Super heating as well as sub-cooling takes place at constant pressure. Super heat is applicable to the vapor phase. The sub cooling is applicable to liquid phase. Super heat Use of degree of super heat is with (a) Solids (b) Liquids (c) Vapors (d) None (Ans: c) Standard degree…
REFRIGERANTS MULTIPLE CHOICE QUESTIONS (MCQ) WITH ANSWERS Refrigerant in a refrigeration system is like blood circulation in the human body. It causes cooling by latent heat of vaporization. Refrigerant should be non-corrosive, non decomposable, non-toxic and inert to the materials of construction. In the event of leakage, it must not chemically react with food…
REFRIGERATION EXPANSION VALVES MULTIPLE CHOICE QUESTION (MCQ) WITH ANSWERS MCQ increases the understanding and clarity. More and more MCQ on expansion valves used in refrigeration will be of further usefulness. Capillary tube is used in plants having cooling capacity of (a) < 3 tons (b) > 3 tons (c) <10 tons (d) None (Ans: a)…