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Test

4.12 Heat Exchangers and Cooling Towers

TRAVIS CANNING 10 preguntas

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Preguntas del test (10)

  1. 1Which of the following are True?
    1. Kettle reboilers have a large liquid volume
    2. Kettle reboilers may use a weir to keep fluid above the tubes
    3. It is important not to flood Thermosyphon reboilers.
    4. Thermosyphons depend on a difference in fluid density to promote flow.
    1. A1,2,3
    2. B1,2,4
    3. C1,3,4
    4. D2,3,4
    5. E1,2,3,4
  2. 2In a Cooling tower the drift eliminators:
    1. ABreak the water into thin sheets to increase the surface area
    2. BDischarge the air at high velocity to minimize re-circulation
    3. CInduce the flow of air through the cooling section
    4. DSeparate entrained moisture from the air
    5. EPrevent waves in the reservoir
  3. 3Which of the following are true for plate heat exchangers?
    1. High turbulence helps prevent fouling
    2. Heat transfers well through the thin plates
    3. Not good for thick fluids
    4. They have a low-pressure drop
    5. Gasket placement is critical
    1. A1,2,3,4
    2. B2,3,4,5
    3. C1,3,4,5
    4. D1,2,4,5
    5. E1,2,3,5
  4. 4Which of the following are true for feed water heaters?
    1. High pressure feedwater heaters are used between the BFP and boiler
    2. Low pressure feedwater heaters are used between the hotwell and dearator
    3. Turbine extraction steam is commonly used for feedwater heater
    4. Feedwater heaters increase cycle efficiency, resulting in lower fuel costs
    5. Feed water heaters are not considered pressure vessels
    1. A1,2
    2. B1,3
    3. C1,4
    4. D1,2,3,4
    5. E1,2,3
  5. 5Hairpin exchangers:
    1. AAre mainly used when the exchange surface are exceeds 50 m
    2. BAre easily assembled
    3. CAre easily cleaned
    4. DAre used only for low pressures
    5. EAre rarely used for heat exchange surfaces below 18m2
  6. 6In one design of shell and tube exchanger, a floating head:
    1. AHelps to allow for expansion due to heat
    2. BHelps the operator to control water hammer
    3. CHelps the millwright to flare the tubes
    4. DCan be constructed of plastic
  7. 7Concentric pipe heat exchangers
    1. ATypically use concurrent flows
    2. BAlways use a smooth bore annulus
    3. CAre bulky
    4. DAlways use consecutive flows
    5. EAre used for low heat duties
  8. 8Which of the following are true for overhead aerial condensers?
    1. The footprint influences the design choice
    2. Air re-circulation is a way to control temperatures in a tube bank
    3. Headers or header boxes contain plugs for tube cleaning
    4. Freezing of tube bundles is not normally a concern even on cold days
    5. The vertical type is only used for steam condensing
    1. A1,2,3
    2. B2,3,4
    3. C3,4,5
    4. D1,3,5
    5. E1,2,3,4,5
  9. 9The hyperbolic cooling tower has the advantages of:
    1. Low initial cost
    2. Low power consumption
    3. Dependability
    4. Minimum maintenance
    1. A1,2,3
    2. B2,3,4
    3. C1,3,4
    4. D1,2,4
    5. E1,2,3,4
  10. 10Which of the following are true for aerial heat exchangers?
    1. A bay may have on or more tube bundles
    2. A unit may have one or more bays
    3. A bank may have on or more units
    4. Temperature control may be attained by stop start or variable speed fans.
    5. Cleaning the outside of coils is a regular maintenance chore.
    1. A1,2,3
    2. B2,3
    3. C2,3,4
    4. D2,4,5
    5. E1,2,3,4,5

Información

Descripción
power engineering 3b2 Test sobre 4.12 Heat Exchangers and Cooling Towers, creado por TRAVIS CANNING el 01/03/2016.
Idioma
English
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