Quiz
Heat Transfer
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Perguntas do quiz (25)
1The zeroth law: If two systems are in [blank_start]thermalequilibrium[blank_end] with a [blank_start]third system[blank_end], they are also in
thermal equilibrium with [blank_start]each other[blank_end].- Athermal equilibrium
- Bthird system
- Ceach other
2The first law : It states that energy can be [blank_start]transformed[blank_end], i.e.
changed from one form to another, but cannot be
[blank_start]created or destroyed.[blank_end] It is usually formulated by
stating that the change in the [blank_start]internal energy[blank_end] of a
system ([blank_start]U[blank_end]) is equal to the amount of [blank_start]heatsupplied[blank_end] to the system ([blank_start]Q[blank_end]), minus the amount of
[blank_start]work performed[blank_end] by the system on its
surroundings ([blank_start]W[blank_end]).- Atransformed
- Bcreated or destroyed.
- Cinternal energy
- DU
- Eheat supplied
- FQ
- Gwork performed
- HW
3What is the Mean Free Path and what do the symboles in its equation stand for?
- AThe mean distance that a particle travels before colliding with
another particle is called the Mean Free Path of the fluid.
l – mean free path, kB – Boltzman constant, T – temperature, d - atomic
(molecular) diameter, p – pressure - BThe spacing being particles within a substance is called the Mean Free Path of the fluid.
l – mean free path, kB – Boltzman constant, T – temperature, d - atomic
(molecular) diameter, p – pressure - CThe mean distance that a particle travels before colliding with
another particle is called the Mean Free Path of the fluid.
l – mean free path, kB – Spring constant, T – temperature, d - atomic
(molecular) diameter, p – pressure
- AThe mean distance that a particle travels before colliding with
4What do each of the symbols in this equation stand for.
- Aconductivity
- Bparticles per volume
- Cmean particle speed
- Dmean free path
- Emolar heat capacity
- FAvogadro’s number
5What is the thermal equivalent of the following equation: V = IR
- AdeltaT = Cp * R
- BT = q * R
- CdeltaT = q * R
- DP = q * Cp
6What is the equation below and label it?
- ATemperature
- Bthickness
- Cconductivity
- DThermal Resistance
- Esurface area
7Label the equation below and what does it find?
- Aheat transfer coefficient
- BVolume
- CSurface Area
- Dthermal conductivity
- EBiot Number
8When the [blank_start]thermal resistance[blank_end] to heat transferred into the object is
[blank_start]larger[blank_end] than the resistance to heat being [blank_start]diffused[blank_end] completely within the
object, the Biot number is less than 1.- Athermal resistance
- Blarger
- Cdiffused
9Label the following equation for the capacitive model.
- ATemperature of fluid
- BInitial Temperature
- CTemperature after time
- Dheat capacity
- EHeat transfer co-effecient
- FTime
10Label the following equation for intensity of radiation.
- ASpectral Radiance
- BPlanks's Constant
- CSpeed of Light
- DWavelength
11Label the following equation:
- AEnergy in a black body
- BTemperature
- CStefan Boltzman constant
12Select the correct options for how radiation would react with a substance in reality.
- AReflection
- BAdsorbed
- CTransmitted
- DIncident radiation
- EReflection
- FAbsorbed
- GTransmitted
- HIncident Radiation
- IReflection
- JAbsorbed
- KTransmitted
- LIncident radiation
- MNot present
- NNot present
- ONot present
- PReflection
- QAdsorbed
- RTransmitted
- SIncident Radiation
- TNot present
13Select the correct options for how radiation would react for a perfectly reflective surface.
- AReflection
- BAbsorbed
- CTransmitted
- DIncident radiation
- ENot present
- FReflection
- GAbsorbed
- HTransmitted
- IIncident Radiation
- JNot present
- KReflection
- LAbsorbed
- MTransmitted
- NIncident radiation
- ONot present
- PReflection
- QAbsorbed
- RTransmitted
- SIncident Radiation
- TNot present
14Select the correct options for how radiation would react with a black body.
- AReflection
- BAbsorbed
- CTransmitted
- DIncident Radiation
- ENot present
- FReflection
- GAbsorbtion
- HTransmitted
- IIncident Radiation
- JNot present
- KReflection
- LAbsorbed
- MTransmitted
- NIncident Radiation
- ONot present
- PReflection
- QAbsorbed
- RTransmitted
- SIncident radiation
- TNot present
15Select the correct option for how radiation would react for a perfectly transparent substance.
- AReflection
- BAbsorbed
- CTransmitted
- DIncident Radation
- ENot present
- FReflection
- GAbsorbed
- HTransmitted
- IIncident radiation
- JNot present
- KReflection
- LAbsorbed
- MTransmitted
- NIncident Radiation
- ONot present
- PReflection
- QAbsorbed
- RTranmitted
- SIncident Radiation
- TNot Present
16Heat in a transistor is generated by the interaction between [blank_start]moving electrons[blank_end] and [blank_start]the vibrating atoms[blank_end] in the material lattice structure. This is called [blank_start]Joule heating[blank_end].
- Amoving electrons
- Bthe vibrating atoms
- CJoule heating
17Which of the following statements about the thermal runaway are true.
- ABelow the runaway area the thermal resistance increases with temperature
- BThe thermal resistance does not drop until the melt temperature is reached
- CMore current is allowed to flow through a material which is experiencing thermal runaway
- DOnce more current is flowing the rate of temperature increase slows.
18Heat Sinks suffer from thermal contact resistances
- AVerdadeiro
- BFalso
19Identify the correct statements
- ACopper heat sinks have a great conductivity than aluminium heat sinks
- BCopper heat sinks can be extruded
- CAluminium heat sinks have to be machined
- DAluminium heat sinks are cheaper
20Label the following equation for fin efficency
- AFin efficency
- Bhyperbolic tan
- Cconvection coefficient
- DFin height
- EThermal conductivity
- Ffin thickness
21Spreading resistance occurs when thermal energy is transferred from
a [blank_start]small area[blank_end] to a [blank_start]larger area[blank_end] in a substance with finite thermal conductivity.- Asmall area
- Blarger area
22Which of the questions below is the equation for the thermal resistance related to conduction in a thermal resistive network?
- Ae / e*A
- Be*A / 1 - e
- C1 - e / e*A
23Identify the two correct statements related to thermal resistive networks.
- AA black body will reflect all heat and thus has no resistance
- BA perfectly reflective surface will reflect all heat and has no resistance value
- CA surface with a large area has no associated resistance
- DA surface with a small area has no associated resistance
24In a solid there are strong bonds between atoms/molecules in the crystal latices. In order to [blank_start]melt[blank_end] these bonds must be overcome, requiring [blank_start]energy to be input[blank_end]. When liquid [blank_start]recrystallizes[blank_end] into a solid, these bonds are reformed and the stored energy is is [blank_start]released[blank_end]. The sentences above describe [blank_start]latent heat[blank_end].
- Amelt
- Benergy to be input
- Crecrystallizes
- Dreleased
- Elatent heat
25Describe the process for a heat pipe.
- AWorking fluid evaporates turning vapour
- Babsorbing thermal energy
- CVapour migrates along cavity to low temp
- DVapour condenses back to fluid and is
- Eabsorbed by the wick, releasing energy
- FWorking fluid flows back to high temp
Informações
- Descrição
- Masters Product Design Engineering Quiz sobre Heat Transfer, criado por Grant Crichton em 07-05-2016.
- Autor
- Grant Crichton
- Idioma
- English
- Visualizações
- 2
- Etiquetas
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