Description : Recovery of waste heat from hot fluid to fluid is called: a) thermo compressor b) waste heat recovery boiler c) heat Pump d) economizer
Last Answer : heat Pump
Description : Nellore to medium temperature waste heat recovery system the most suitable device is ------ a) Economizer b) Heat wheels c) Air preheater d) Recuperate d) Carbonate
Last Answer : Heat wheels
Description : Economizer is provided to utilize the flue gas heat for ___ a) preheating the boiler feed water b) preheating the stock c) preheating the combustion air d) preheating fuel
Last Answer : preheating the boiler feed water
Description : Air preheater is not used as a waste heat recovery system in a____. a) Boiler b) billet Reheating Furnace c) Heat treatment furnace d) compressor
Last Answer : compressor
Description : Recuperated is used mainly as a waste heat recovery system in a ____. a) Boiler b) Billet Reheating Furnace c) Compressor d) None of the above
Last Answer : Billet Reheating Furnace
Description : Through what is feed water from hot-well is passed through, before entering steam and water drum in Lamont boiler? a. Evaporator tubes b. Economizer c. Distributor header d. Circulating pump
Last Answer : b. Economizer
Description : In which of the waste heat recovery equipment, the flow of flue gas and air is alternately reversed after a fixed interval of time? (A) Recuperator (B) Regenerator (C) Waste heat boiler (D) None of these
Last Answer : (B) Regenerator
Description : The waste heat energy could be used to produce ....... a) Cool air b) Hot air c) Exhaust gas d) All of the above
Last Answer : Cool air
Description : Design of waste heat boiler for recovery of waste heat from furnace gases depends upon the (A) Quantity & temperature of waste gas (B) Dust concentration & nature of dust in waste gas (C) Corrosive nature of the waste gas (D) All (A), (B) and (C)
Last Answer : (B) Dust concentration & nature of dust in waste gas
Description : Which of the following is not a continuous waste heat recovery equipment from the flue gases going out of furnace? (A) Economiser (B) Regenerator (C) Ceramic recuperator (D) Waste heat boiler
Description : In a low to medium temperature waste heat recovery system which of the device is most suitable a) Economiser b) Heat wheels c) air preheater d) Recuperator
Description : In industrial operations fluids with temperature less than __________ are set as the limit for waste heat recovery because of the risk of condensation of corrosive liquids a. 80C b. 100C c. 120C d. 200C
Last Answer : 100C
Description : Calculate the recoverable waste heat (Q, in kCal/hour) from flue gases using the followingparameters: V (flow rate of the substance) 2000 m3/hr r (density of the flue gas): 0.9 kg/m3 Cp (specific heat ... (temperature difference): 120 oC h (recovery factor): 50% a. 21600 b. 43200 c. 25600 d. 34000
Last Answer : 21600
Description : A high temperature waste heat recovery unit consists of recovering waste heat at temperaturesgreater than _______. a) 200 °C b) 500 °C c) 300 °C d) 400 °C
Last Answer : 400 °C
Description : What are the benefits or the advantages of waste heat recovery units (WHRU)? a) Reduced Pollution b) Reduced equipment sizes c) Reduced auxiliary energy consumption. d) All of the above
Last Answer : All of the above
Description : The waste heat recovery unit (WHRU) is a tool involved in _______. a) Regeneration b) Cogeneration c) Both ‘a’ and ‘b’ d) None of the above
Last Answer : Cogeneration
Description : A waste heat recovery unit (WHRU) is an_________ that transfers heat from process outputs at high temperature to another part of the process for some purpose, usually increased efficiency. a) Energy recovery heat exchanger b) Energy recovery heat diffuser c) Both ‘a’ and ‘b’ d) None of the above
Last Answer : Energy recovery heat exchanger
Description : A waste heat recovery unit is an energy recovery heat exchanger that transfers heat from process outputs at ........ a) High temperature b) Medium temperature c) Low temperature d) Both a & b
Last Answer : High temperature
Description : One of the key areas for ....... energy saving in existing systems is waste heat recovery. a) Potential b) Kinetic c) Thermal d) Electrical
Last Answer : Potential
Description : Techniques of waste heat recovery ....... a) Direct contact condensation b) Indirect contact condensation c) Transport membrane condensation d) All of the above
Description : A waste heat recovery system in industrial process has been key to reduce ....... Consumption. a) Coal b) Fuel c) Biogas d) Oil
Last Answer : Fuel
Description : A major advantage of waste heat recovery in industry is a) Reduction in pollution c) Increase efficiency d) None of the above
Last Answer : Reduction in pollution
Description : Major advantage of waste heat recovery in industry is: a) Reduction in pollution b) increase in efficiency c) Both a & b d) none of the above
Last Answer : Both a & b
Description : Capillary wick is a part of a) heat pump b) heat wheel c) heat pipe d) regenerator
Last Answer : heat pipe
Description : The economiser is used in boilers to........ A]Increase thermal efficiency of boiler B]Economise on fuel C]Extract heat from the exhaust the gases D]Increase flue gas temperature
Last Answer : A]Increase thermal efficiency of boiler
Description : To reduce the stack loss, heat recovery from flue gas can be done by (A) Preheating of cold stock (B) Preheating of combustion air (C) Steam generation in waste heat boilers (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : Flue gases coming out from furnace is first going through a) Turbine b) Economizer c) Air pre-heater d) Chimney
Last Answer : Ans: Economizer
Description : In a Rankine cycle, with the maximum steam temperature being fixed from metallurgical considerations, as the boiler pressure increases (a) The condenser load will increase [IES-1997] (b) The ... The quality of turbine exhaust will increase (d) The quality of turbine exhaust will remain unchanged
Last Answer : (b) The quality of turbine exhaust will decrease
Description : The system is suitable to recover heat from ........ temperature exhaust gases . a) Medium-low b) Medium-high c) High-low d) High
Last Answer : Medium-high
Description : Metallic recuperators are not used for waste heat recovery, if the hot flue gas temperature is above __________ °C, because corrosion prevails at higher temperatures. (A) 350 (B) 750 (C) 1050 (D) 1250
Last Answer : (B) 750
Description : Thermal efficiency of furnaces can be improved by (A) Waste heat recovery from flue gas (B) Minimising heat losses from furnace walls (C) Maintaining proper draught (D) All (A), (B) and (C
Last Answer : (D) All (A), (B) and (C
Description : Regenerators are used for waste heat recovery in (A) By-product coke ovens (B) Beehive coke oven (C) Blast furnace stoves (D) Soaking pits
Last Answer : (A) By-product coke ovens
Description : Heat transfer rate to the stock/charge in the furnace does not depend upon the (A) Emissivity of the refractory walls (B) Size of the furnace (C) Use of waste heat recovery equipments (D) Thickness of the stock
Last Answer : (C) Use of waste heat recovery equipments
Description : Pitch creosote mixture (PCM) as compared to furnace oil is a better fuel, because its (A) Emissivity factor is higher (B) Sulphur content is lower (C) Flue gas has lower dew point thereby facilitating more waste heat recovery (D) All (A), (B) and (C)
Description : Define the term waste heat recovery?
Last Answer : Waste heat is the heat which is not at all used and exhausted out as a waste product. Waste heat is normally available from the industry in the form of process steam and water at high ... industries. This heat can be recovered for useful purpose. This process is known-as waste heat recovery.
Description : Define The Term Waste Heat Recovery?
Last Answer : Waste heat is the heat which is not at all used and exhausted out as a waste product. Waste heat is normally available from the industry in the form of process steam and water at high ... industries. This heat can be recovered for useful purpose. This process is known as waste heat recovery.
Description : Benefits of Waste Heat Recovery a. Reduction in pollution b. Reduction in equipment sizes c. Reduction in auxiliary energy consumption d. All of the above
Last Answer : Ans:- d. All of the above
Description : Waste heat Recovery system
Last Answer : Waste heat Recovery system Waste heat is energy that is rejected to the environment. It arises from equipment and operating inefficiencies, as well as from thermodynamic limitations on equipment and ... to minimize these costs, and to reduce environmental impact along with several other benefits.
Description : Exhaust gas energy recovery in Electro turbo compounding (ETC) up to a. 10% Possible b. 20% Possible c. 30% Possible d. 40% Possible
Last Answer : Ans:- b. 20% Possible
Description : It is the unbalanced force developed in a turbo jet engine that is caused by the difference in the momentum of the low-velocity air entering the engine and the high velocity exhaust gases leaving the engine. a. Fall b. Lift c. Drag d. Thrust
Last Answer : Thrust
Description : Heat recovery provides valuable energy sources and ....... consumption. a) Reduce energy b) Increase energy c) Increase fuel d) Reduce fuel
Last Answer : Reduce energy
Description : Energy recovery is typically via production of ____ a) Gas b) Heat c) Light d) Steam
Last Answer : Steam
Description : Heat recovery equipment will be most effective when the temperature of flue gas is: a) 250oC b) 200 oC c)400 oC d) 280 oC
Last Answer : 400 oC
Description : Which is an example of closed system? (A) Air compressor (B) Liquid cooling system of an automobile (C) Boiler (D) None of these
Last Answer : (B) Liquid cooling system of an automobile
Description : A simple steam engine receives steam from the boiler at 180˚C and exhausts directly into the air at 100˚C. What is the upper limit of its efficiency? a. 11.28 % b. 36.77 % c. 20.36 % d. 17.66 %
Last Answer : 17.66 %
Description : What is an Economizer?
Last Answer : An economizer is a mechanical device which is used as a heat exchanger by preheating water by recovering residual heat from the flue gases in thermal power plant.
Description : State necessity of super heater in steam boilers. State advantages of economizer.
Last Answer : Necessity of super heater in steam boilers: 1. The efficiency of the boiler is increase with the use of superheated steam. 2. It eliminates the erosion of the turbine blades. 3. It reduces ... water. 5. This unit improves the overall efficiency of the boiler by reducing the fuel consumption.
Description : State the function of superheater and economizer.
Last Answer : Function of Superheater : The steam produced in the boiler is not dry but contains some moisture. Such wet steam can damage/corrode and reduce the efficiency of the plant. Hence before supplying ... the temperature of feed water to the boiler, so that efficiency of overall system is increased.
Description : State the location and function of i) Economizer ii) Feed water heater.
Last Answer : (i) Economizer:- Location: - It is placed in the path of flue gases in between the exit from the furnace and the chimney. OR In The way of feed water before boiler. Function: - ... economizer. Function: - Its function is to increase the temperature of feed water by using blade steam.
Description : In a typical layout of a 215MW reheat power plant, the feed in the boiler is at? a) 280 degree Centigrade b) 230 degree Centigrade c) 238 degree Centigrade d) 250 degree Centigrade
Last Answer : c) 238 degree Centigrade