2.4 Waste Heat Recovery-Process Industry
1 Out of the following which one is not unconventional source of energy?- (A) Tidal power
- (B) Geothermal energy
- (C) Nuclear energy
- (D) Wind power.
2 Pulverized coal is
- (A) Coal free from ash
- (B) Non-smoking coal
- (C) Coal which bums for long time
- (D) Coal broken into fine particles.
3 Heating value of coal is approximately in power plant
- (A) 1000-2000 kcal / kg
- (B) 2000-4000 kcal / kg
- (C) 5000-6500 kcal / kg
- (D) 9000-10,500 kcal / kg.
4 Water gas is a mixture of
- (A) CO2 and O2
- (B) O2 and H2
- (C) H2, N2 and O2
- (D) CO, N2 and H2.
5 Coal used in power plant is also known as
- (A) Steam coal
- (B) Charcoal
- (C) Coke
- (D) Soft coal.
6 Which of the following is considered as superior quality of coal?
- (A) Bituminous coal
- (B) Peat
- (C) Lignite
- (D) Coke.
7 In a power plant, coal is carried from storage place to boilers generally by means of
- (A) Bucket
- (B) V-belts
- (C) Trolleys
- (D) Manually.
8 Live storage of coal in a power plant means
- (A) Coal ready for combustion
- (B) Preheated coal
- (C) Storage of coal sufficient to meet 24 hour demand of the plant
- (D) Coal in transit.
9 Pressure of steam in condenser is
- (A) Atmospheric pressure
- (B) More than atmospheric pressure
- (C) Slightly less than atmospheric pressure
- (D) Much less than atmospheric pressure.
10 Equipment used for pulverizing the coal is known as
- (A) Ball mill
- (B) Hopper
- (C) Burner
- (D) Stoker
11 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
12 Heat recovery equipment will be most effective when the temperature of flue gas is:
- (A) 250°C
- (B) 200°C
- (C) 400°C
- (D) 280°C
13 The waste gases coming out from gas turbine exhausts are of the order of:
- (A) 370-540
- (B) 450 – 700
- (C) 700-800
- (D) 250-440
14 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
15 Recuperated will be more efficient if the flow path of hot and cold fluids is in:
- (A) Co-current mode
- (B) Counter current mode
- (C) Cross current mode
- (D) Cone of the above
16 The major limitation of metallic recuperated is ——-
- (A) Limitation of handling COx, NOx etc.
- (B) Limitation of reduced life for handling temperature more than 1000°C
- (C) Manufacturing difficulty of the required design
- (D) None of the above
17 Ceramic remunerators can withstand temperatures up to:
- (A) 600°C
- (B) 1300°C
- (C) 1700°C
- (D) 950°C
18 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
19 Typical waste gases temperature from glass melting furnace
- (A) 1000-1550°C
- (B) 800-950°C
- (C) 650–750°C
- (D) 760-815°C
20 Regenerator is widely used in:
- (A) Reheating Furnaces
- (B) heat treatment furnaces
- (C) Baking Ovens
- (D) glass melting furnaces
21 In a low to medium temperature waste heat recovery system which of the device is most suitable
- (A) Economizer
- (B) Heat wheels
- (C) air preheater
- (D) Recuperator
22 Recovery of heat from dryer exhaust air is a typical application of:
- (A) Waste heat recovery boiler
- (B) Heat pump
- (C) Heat wheel
- (D) Economizer
23 Capillary wick is a part of
- (A) heat pump
- (B) heat wheel
- (C) heat pipe
- (D) regenerator
24 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
25 Recovery of waste heat from hot fluid to fluid is called:
- (A) thermo compressor
- (B) waste heat recovery boiler
- (C) heat Pump
- (D) economizer
26 Thermo-compressor is commonly used for
- (A) compressing hot air
- (B) flash steam recovery
- (C) distillation
- (D) reverse compression of CO2
27 The exchanger typically used in the pressurizing section of a dairy plant is
- (A) Plate heat exchanger
- (B) Shell and tube exchanger
- (C) Run around coil exchanger
- (D) All of the above
28 Pick up the odd one out:
- (A) Regenerator
- (B) Recuperator
- (C) Metallic recuperator
- (D) Economizer
29 Energy recovery is typically via production of ____
- (A) Gas
- (B) Heat
- (C) Light
- (D) Steam
30 What is the maximum percent of energy recovered if the steam is condensed before reintroduced to system?
- (A) 25
- (B) 35
- (C) 45
- (D) 55
31 Which of the following industrial process uses waste as a fuel?
- (A) Cement kilns
- (B) Lead manufacturing
- (C) Acid manufacturing
- (D) Sulphur manufacturing
32 What is the combustion temperature range in cement kiln incineration?
- (A) 1300-1600
- (B) 1350-1650
- (C) 1250-1450
- (D) 1235-1600
33 Non-volatile heavy metals in kiln are fixed into ____
- (A) Clinker’s crystalline structure
- (B) Fumes
- (C) Solid lump
- (D) Slag
34 Which of the following waste types are not suitable for co-combustion in cement kilns?
- (A) Chlorine
- (B) Hydrogen
- (C) Calcium
- (D) Carbonate
35 A major advantage of waste heat recovery in industry is
- (A) Reduction in pollution
- (B) Increase efficiency
- (C) None of the above
- (D)
36 In a low to medium temperature waste heat recovery system the most suitable device is ——
- (A) Economizer
- (B) Heat wheels
- (C) Air preheater
- (D) Recuperate
37 Which of the following act regulates transportation of hazardous waste?
- (A) RCRA
- (B) CERCLA
- (C) NEPA
- (D) NPL
38 When was the first law regarding transportation of hazardous materials passed?
- (A) 1966
- (B) 1866
- (C) 1855
- (D) 1965
39 Which of the following statute made transportation of hazardous materials illegal?
- (A) 1869
- (B) 1870
- (C) 1871
- (D) 1872
40 Which of the following act improves regulatory and enforcement activities?
- (A) HMTA
- (B) DOT
- (C) ICC
- (D) NPL
41 A waste heat recovery system in industrial process has been key to reduce ……consumption.
- (A) Coal
- (B) Fuel
- (C) Biogas
- (D) Oil
42 Heat loss can be classified into …….
- (A) High temperature
- (B) Low temperature
- (C) Medium temperature
- (D) All of the above
43 Heat recovery provides valuable energy sources and ……consumption.
- (A) Reduce energy
- (B) Increase energy
- (C) Increase fuel
- (D) Reduce fuel
44 Techniques of waste heat recovery …….
- (A) Direct contact condensation
- (B) Indirect contact condensation
- (C) Transport membrane condensation
- (D) All of the above
45 One of the key areas for ……energy saving in existing systems is waste heat recovery.
- (A) Potential
- (B) Kinetic
- (C) Thermal
- (D) Electrical
46 The biggest point sources of waste heat originate from ……. production.
- (A) Steel or Brass
- (B) Copper or Glass
- (C) Steel or Glass
- (D) Steel or Copper
47 The system is suitable to recover heat from …….. temperature exhaust gases.
- (A) Medium-low
- (B) Medium-high
- (C) High-low
- (D) High
48 The waste heat energy could be used to produce …….
- (A) Cool air
- (B) Hot air
- (C) Exhaust gas
- (D) All of the above
49 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
50 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
51 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
52 Using an organic fluid that boils at a low temperature means that energy could be regenerated from waste fluids is known as ________.
- (A) Heat exchanger
- (B) Heat remover
- (C) Heat pumps
- (D) Heat absorber
53 Traditionally, waste heat of low temperature range ________ has not been used for electricity generation despite efforts by ORC companies, mainly because the Carnot efficiency is rather low.
- (A) 0-250 °C
- (B) 0-150 °C
- (C) 0-200 °C
- (D) 0-120 °C
54 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
55 A high temperature waste heat recovery unit consists of recovering waste heat at temperatures greater than _______.
- (A) 200 °C
- (B) 500 °C
- (C) 300 °C
- (D) 400 °C
56 Types of waste heat exchanger are:
- (A) Regenerative and recuperative burners
- (B) Economizers
- (C) Waste heat boilers
- (D) All of the above
57 Calculate the recoverable waste heat (Q, in kCal/hour) from flue gases using the following parameters: V (flow rate of the substance) 2000 m3/hr r (density of the flue gas): 0.9 kg/m3 Cp (specific heat of the substance): 0.20 kCal/kg °C DT (temperature difference): 120 °C h (recovery factor): 50%
- (A) 21600
- (B) 43200
- (C) 25600
- (D) 34000
58 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) 80°C
- (B) 100°C
- (C) 120°C
- (D) 200°C