Emerging Trends in Mechanical Engineering

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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.
[showhide type=”button7c1″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
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.
[showhide type=”button7c2″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
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.
[showhide type=”button7c3″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
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.
[showhide type=”button7c4″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
5   Coal used in power plant is also known as
    (A)   Steam coal
    (B)   Charcoal
    (C)   Coke
    (D)   Soft coal.
[showhide type=”button7c5″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
6   Which of the following is considered as superior quality of coal?
    (A)   Bituminous coal
    (B)   Peat
    (C)   Lignite
    (D)   Coke.
[showhide type=”button7c6″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
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.
[showhide type=”button7c7″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
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.
[showhide type=”button7c8″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
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.
[showhide type=”button7c9″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
10   Equipment used for pulverizing the coal is known as
    (A)   Ball mill
    (B)   Hopper
    (C)   Burner
    (D)   Stoker
[showhide type=”button7c10″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
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
[showhide type=”button7c11″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
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
[showhide type=”button7c12″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
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
[showhide type=”button7c13″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
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
[showhide type=”button7c14″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
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
[showhide type=”button7c15″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
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
[showhide type=”button7c16″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
17   Ceramic remunerators can withstand temperatures up to:
    (A)   600°C
    (B)   1300°C
    (C)   1700°C
    (D)   950°C
[showhide type=”button7c17″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
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
[showhide type=”button7c18″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
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
[showhide type=”button7c19″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
20   Regenerator is widely used in:
    (A)   Reheating Furnaces
    (B)   heat treatment furnaces
    (C)   Baking Ovens
    (D)   glass melting furnaces
[showhide type=”button7c20″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
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
[showhide type=”button7c21″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
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
[showhide type=”button7c22″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
23   Capillary wick is a part of
    (A)   heat pump
    (B)   heat wheel
    (C)   heat pipe
    (D)   regenerator
[showhide type=”button7c23″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
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
[showhide type=”button7c24″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
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
[showhide type=”button7c25″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
26   Thermo-compressor is commonly used for
    (A)   compressing hot air
    (B)   flash steam recovery
    (C)   distillation
    (D)   reverse compression of CO2
[showhide type=”button7c26″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
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
[showhide type=”button7c27″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
28   Pick up the odd one out:
    (A)   Regenerator
    (B)   Recuperator
    (C)   Metallic recuperator
    (D)   Economizer
[showhide type=”button7c28″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
29   Energy recovery is typically via production of ____
    (A)   Gas
    (B)   Heat
    (C)   Light
    (D)   Steam
[showhide type=”button7c29″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
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
[showhide type=”button7c30″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
31   Which of the following industrial process uses waste as a fuel?
    (A)   Cement kilns
    (B)   Lead manufacturing
    (C)   Acid manufacturing
    (D)   Sulphur manufacturing
[showhide type=”button8c1″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
32   What is the combustion temperature range in cement kiln incineration?
    (A)   1300-1600
    (B)   1350-1650
    (C)   1250-1450
    (D)   1235-1600
[showhide type=”button8c2″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
33   Non-volatile heavy metals in kiln are fixed into ____
    (A)   Clinker’s crystalline structure
    (B)   Fumes
    (C)   Solid lump
    (D)   Slag
[showhide type=”button8c3″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
34   Which of the following waste types are not suitable for co-combustion in cement kilns?
    (A)   Chlorine
    (B)   Hydrogen
    (C)   Calcium
    (D)   Carbonate
[showhide type=”button8c4″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
35   A major advantage of waste heat recovery in industry is
    (A)   Reduction in pollution
    (B)   Increase efficiency
    (C)   None of the above
    (D)  
[showhide type=”button8c5″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
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
[showhide type=”button8c6″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
37   Which of the following act regulates transportation of hazardous waste?
    (A)   RCRA
    (B)   CERCLA
    (C)   NEPA
    (D)   NPL
[showhide type=”button8c7″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
38   When was the first law regarding transportation of hazardous materials passed?
    (A)   1966
    (B)   1866
    (C)   1855
    (D)   1965
[showhide type=”button8c8″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
39   Which of the following statute made transportation of hazardous materials illegal?
    (A)   1869
    (B)   1870
    (C)   1871
    (D)   1872
[showhide type=”button8c9″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
40   Which of the following act improves regulatory and enforcement activities?
    (A)   HMTA
    (B)   DOT
    (C)   ICC
    (D)   NPL
[showhide type=”button8c10″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
41   A waste heat recovery system in industrial process has been key to reduce ……consumption.
    (A)   Coal
    (B)   Fuel
    (C)   Biogas
    (D)   Oil
[showhide type=”button8c11″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
42   Heat loss can be classified into …….
    (A)   High temperature
    (B)   Low temperature
    (C)   Medium temperature
    (D)   All of the above
[showhide type=”button8c12″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
43   Heat recovery provides valuable energy sources and ……consumption.
    (A)   Reduce energy
    (B)   Increase energy
    (C)   Increase fuel
    (D)   Reduce fuel
[showhide type=”button8c13″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
44   Techniques of waste heat recovery …….
    (A)   Direct contact condensation
    (B)   Indirect contact condensation
    (C)   Transport membrane condensation
    (D)   All of the above
[showhide type=”button8c14″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
45   One of the key areas for ……energy saving in existing systems is waste heat recovery.
    (A)   Potential
    (B)   Kinetic
    (C)   Thermal
    (D)   Electrical
[showhide type=”button8c15″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
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
[showhide type=”button8c16″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
47   The system is suitable to recover heat from …….. temperature exhaust gases.
    (A)   Medium-low
    (B)   Medium-high
    (C)   High-low
    (D)   High
[showhide type=”button8c17″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
48   The waste heat energy could be used to produce …….
    (A)   Cool air
    (B)   Hot air
    (C)   Exhaust gas
    (D)   All of the above
[showhide type=”button8c18″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
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
[showhide type=”button8c19″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
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
[showhide type=”button8c20″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
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
[showhide type=”button8c21″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
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
[showhide type=”button8c22″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
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
[showhide type=”button8c23″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
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
[showhide type=”button8c24″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
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
[showhide type=”button8c25″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
56   Types of waste heat exchanger are:
    (A)   Regenerative and recuperative burners
    (B)   Economizers
    (C)   Waste heat boilers
    (D)   All of the above
[showhide type=”button8c26″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
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
[showhide type=”button8c27″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
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
[showhide type=”button8c28″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]

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