what mode of heat transfer explains why heating vents are best placed near the floor?

what mode of heat transfer explains why heating vents are best placed near the floor?
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radiation
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Which of the following options correctly explains the term heat budget? (1) It is a mode of transfer of heat through matter by molecular activity. (2) It is the balance between incoming and outgoing radiation. (3) It is the radiation from the earth in the form of long waves. (4) It is the amount of heat which the surface of earth receives from the sun.

Description : Which of the following options correctly explains the term heat budget? (1) It is a mode of transfer of heat through matter by molecular activity. (2) It is the balance between incoming and outgoing radiation. ... waves. (4) It is the amount of heat which the surface of earth receives from the sun.

Last Answer : (2) It is the balance between in-coming and outgoing radiation. Explanation: Incoming heat being absorbed by the Earth, and outgoing heat escaping the Earth in the form of radiation are both ... each passing year. This balance between incoming and outgoing heat is known as Earth's heat budget.

Which of the following options correctly explains the term heat budget? (1) It is a mode of transfer of heat through matter by molecular activity. (2) It is the balance between incoming and outgoing radiation (3) It is the radiation from the earth in the form of long waves. (4) It is the amount of heat which the surface of earth receives from the sun.

Description : Which of the following options correctly explains the term heat budget? (1) It is a mode of transfer of heat through matter by molecular activity. (2) It is the balance between incoming and outgoing radiation ... waves. (4) It is the amount of heat which the surface of earth receives from the sun.

Last Answer :  It is the balance between incoming and outgoing radiation

How can I fix the vent on a 2001 Saab stationwagon ( 9- 5 model _ so that it does not blow outside cold air on driver foot while rest of heating vents seem to work properly?

Description : How can I fix the vent on a 2001 Saab stationwagon ( 9- 5 model _ so that it does not blow outside cold air on driver foot while rest of heating vents seem to work properly?

Last Answer : Easy fix: just put duct tape over it.

Which property of light best explains the way a straw appears to “break” when placed in a glass of water and viewed from the side? a) Reflection b) Refraction c) Absorption d) Water waves

Description : Which property of light best explains the way a straw appears to “break” when placed in a glass of water and viewed from the side? a) Reflection b) Refraction c) Absorption d) Water waves

Last Answer : b) Refraction

The atmosphere near the earth’s surface is “heated from below.” Which of the following does not significantly contribute to this heating -----------? A. Conduction of heat upward from a hot surface B. Convection from a hot surface C. Absorption of infrared energy that has been radiated from the surface D. Heat energy from the earth’s interior (Answer)

Description : The atmosphere near the earth's surface is heated from below. Which of the following does not significantly contribute to this heating -----------? A. Conduction of heat upward from a ... infrared energy that has been radiated from the surface D. Heat energy from the earth's interior (Answer)

Last Answer : D. Heat energy from the earth’s interior (Answer)

Double pipe heat exchangers are used (A) When heat transfer area required is very high (B) When heat transfer area required is very low, i.e. (100-200 ft 2 ). (C) Because it occupies less floor area (D) Because it is less costly

Description : Double pipe heat exchangers are used (A) When heat transfer area required is very high (B) When heat transfer area required is very low, i.e. (100-200 ft 2 ). (C) Because it occupies less floor area (D) Because it is less costly

Last Answer : (B) When heat transfer area required is very low, i.e. (100-200 ft 2 )

In which mode of heat transfer, the Biot number is important? (A) Transient heat conduction (B) Natural convection (C) Forced convection (D) Radiation

Description : In which mode of heat transfer, the Biot number is important? (A) Transient heat conduction (B) Natural convection (C) Forced convection (D) Radiation

Last Answer : (A) Transient heat conduction

Mode of heat transfer in which the fluid moves under the influence of changes in fluid pressure produced by external work is called (A) Radiation (B) Natural convection (C) Forced convection (D) Conduction

Description : Mode of heat transfer in which the fluid moves under the influence of changes in fluid pressure produced by external work is called (A) Radiation (B) Natural convection (C) Forced convection (D) Conduction

Last Answer : (C) Forced convection

Mode of heat transfer involved in the cooling of air cooled internal combustion engine is (A) Conduction(B) Natural convection(C) Forced convection(D) None of these

Description : Mode of heat transfer involved in the cooling of air cooled internal combustion engine is (A) Conduction (B) Natural convection (C) Forced convection (D) None of these

Last Answer : (B) Natural convection

Explain application of conduction and convection mode of heat transfer in automobile.

Description : Explain application of conduction and convection mode of heat transfer in automobile.

Last Answer : Applications of conduction1. Fins provided on motor cycle engine 2. Electric fuse cut off 3. Electric heater 4. Carbonisation of coal 5. Melting of iron in blast furnace 6. Fission reactions in ... 5. Radiator - Puts warm air out at the top and draws in cooler air at the bottom.

Rate of heat transfer by vaporisation from pools of water is affected by the (A) Nature of heating surface and distribution of bubbles (B) Surface tension of water (C) Viscosity of water (D) All (A), (B) and (C)

Description : Rate of heat transfer by vaporisation from pools of water is affected by the (A) Nature of heating surface and distribution of bubbles (B) Surface tension of water (C) Viscosity of water (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

Pick out the wrong statement. (A) Superheated steam is preferably not used for process heating because of its low heat transfer film co-efficient (B) In a shell and tube heat exchanger, the shell pressure drop is maximum for orifice baffles (C) S.I. unit of fouling factor is Watt/m2 .°K (D) Longitudinal fins are used in extended surface heat exchangers, when the direction of fluid flow is parallel to the axis of the tube

Description : Pick out the wrong statement. (A) Superheated steam is preferably not used for process heating because of its low heat transfer film co-efficient (B) In a shell and tube heat exchanger ... surface heat exchangers, when the direction of fluid flow is parallel to the axis of the tube

Last Answer : (C) S.I. unit of fouling factor is Watt/m2 .°K

Pick out the wrong statement. (A) In case of heat transfer by purely forced convection, GR /Re 2 ≤ 1 (B) The equivalent diameter of heat transfer for a duct of square cross￾section (having each side as 'x') is equal to 4x (C) Distillation process is not the same as evaporation (D) The effectiveness of nucleate boiling depends basically on the ease with which the bubbles are formed and detached from the heating surface

Description : Pick out the wrong statement. (A) In case of heat transfer by purely forced convection, GR /Re 2 ≤ 1 (B) The equivalent diameter of heat transfer for a duct of ... nucleate boiling depends basically on the ease with which the bubbles are formed and detached from the heating surface

Last Answer : (B) The equivalent diameter of heat transfer for a duct of square cross￾section (having each side as 'x') is equal to 4x

Analogy between mass and heat transfer is not applicable in case of (A) Same velocity profile or equal eddy diffusivities (B) Thermal or pressure mass diffusion (C) Viscous heating or chemical reaction (D) Both (B) and (C)

Description : Analogy between mass and heat transfer is not applicable in case of (A) Same velocity profile or equal eddy diffusivities (B) Thermal or pressure mass diffusion (C) Viscous heating or chemical reaction (D) Both (B) and (C)

Last Answer : (D) Both (B) and (C)

Heat exchangers operating, when the asymptotic range is reached, (A) Provide very large heat transfer co-efficient (B) Results in making part of the heating surface inactive (C) Results in abruptly increased velocity (D) None of these

Description : Heat exchangers operating, when the asymptotic range is reached, (A) Provide very large heat transfer co-efficient (B) Results in making part of the heating surface inactive (C) Results in abruptly increased velocity (D) None of these

Last Answer : (B) Results in making part of the heating surface inactive

The rate of heat transfer is a product of overall heat transfer co￾efficient, the difference in temperature and the (A) Heating volume (B) Heat transfer area (C) Nusselt number (D) None of these

Description : The rate of heat transfer is a product of overall heat transfer co￾efficient, the difference in temperature and the (A) Heating volume (B) Heat transfer area (C) Nusselt number (D) None of these

Last Answer : (B) Heat transfer area

The maximum heat transfer co-efficient from steam heating will beattained when the steam is: (A) Supersaturated (B) Saturated (C) Wet (D) None of these

Description : The maximum heat transfer co-efficient from steam heating will beattained when the steam is: (A) Supersaturated (B) Saturated (C) Wet (D) None of these

Last Answer : (B) Saturated

Heat transfer co-efficient equation for forced convection, Nu = 0.023 Re 0.8 . Pr n , is not valid, if the value of (A) n = 0.4 is used for heating (B) n = 0.3 is used for cooling (C) Reynolds number for the flow involved is > 10000 (D) Reynolds number for the flow involved is < 2100

Description : Heat transfer co-efficient equation for forced convection, Nu = 0.023 Re 0.8 . Pr n , is not valid, if the value of (A) n = 0.4 is used for heating (B) n = 0.3 is used for cooling (C) Reynolds number for the flow involved is > 10000 (D) Reynolds number for the flow involved is < 2100

Last Answer : (D) Reynolds number for the flow involved is < 2100

Pick out the wrong statement. (A) 'Solvates' are chemical compounds formed by solute with their solvents. When water is the solvent, then it is called a 'hydrate' (B) In heat exchanger calculations (Δt) weighted is used in place of Δt, when it involves more than one sequence of heating or cooling i.e., desuperheating & condensation or condensation & sub-cooling (C) Heat transfer co-efficient during nucleate boiling is not influenced by the agitation imparted (D) In case of short tube vertical evaporators, area of central downtake is about 50 to 100% of the total tube cross-sectional area

Description : Pick out the wrong statement. (A) 'Solvates' are chemical compounds formed by solute with their solvents. When water is the solvent, then it is called a 'hydrate' (B) In heat exchanger ... vertical evaporators, area of central downtake is about 50 to 100% of the total tube cross-sectional area

Last Answer : (C) Heat transfer co-efficient during nucleate boiling is not influenced by the agitation imparted

Heat transfer takes place through a liquid medium surrounding the submerged material under heating, in case of a/an (A) Blast furnace (B) Steam boiler (C) Salt bath furnace (D) Annealing furnace

Description : Heat transfer takes place through a liquid medium surrounding the submerged material under heating, in case of a/an (A) Blast furnace (B) Steam boiler (C) Salt bath furnace (D) Annealing furnace

Last Answer : (C) Salt bath furnace

In a furnace with heating element temperature at 1700°C, the dominant mechanism of heat transfer will be (A) Conduction (B) Radiation (C) Natural convection (D) Forced convection

Description : In a furnace with heating element temperature at 1700°C, the dominant mechanism of heat transfer will be (A) Conduction (B) Radiation (C) Natural convection (D) Forced convection

Last Answer : (B) Radiation

reduction in thermal resistance during heat transfer does not occur in the (A) Convection heat transfer by stirring the fluid and cleaning the heating surface (B) Conduction heat transfer by reduction in the material thickness and increase in the thermal conductivity (C) Radiation heat transfer by increasing the temperature and reducing the emissivity (D) None of these

Description : reduction in thermal resistance during heat transfer does not occur in the (A) Convection heat transfer by stirring the fluid and cleaning the heating surface (B) Conduction heat transfer by ... Radiation heat transfer by increasing the temperature and reducing the emissivity (D) None of these

Last Answer : Option C

Is it better to live in buildings without vents?

Description : Is it better to live in buildings without vents?

Last Answer : answer:Vents send all sorts of odors out. I want air passage. I want vents.

If I put my laptop on my lap and block the air vents, wouldn't this be bad for the computer?

Description : If I put my laptop on my lap and block the air vents, wouldn't this be bad for the computer?

Last Answer : Yes.

What are the advantages/disadvantages of ridge versus roof vents?

Description : What are the advantages/disadvantages of ridge versus roof vents?

Last Answer : Not much difference in functionality – it just looks better because it is less visible.

how to prevent roof septic vents from icing over

Description : how to prevent roof septic vents from icing over

Last Answer : Need Answer

How is the water in hydrothermal vents heated?

Description : How is the water in hydrothermal vents heated?

Last Answer : Feel Free to Answer

What type of cells can live in hot springs and deep sea vents?

Description : What type of cells can live in hot springs and deep sea vents?

Last Answer : What is the answer ?

how often do you have to clean your air vents?

Description : how often do you have to clean your air vents?

Last Answer : There isn't a definite answer to the question. It depends on the situation. If there is moisture (which can promote mold growth) in your ducts, you should do it once or twice a year, but the general recommendation is that your vents and ducts should be cleaned every two years.

What should the temperature be coming out of the vents of my central A/C?

Description : What should the temperature be coming out of the vents of my central A/C?

Last Answer : Ultimately, it should be whatever temperature makes you comfortable, but I'd say a normal temperature would be around 65 degrees or so.

Do roof vents make a house colder?

Description : Do roof vents make a house colder?

Last Answer : Roof vents are used to ventilate humid air out of the attic area of the house to increase the air conditioners ability to cool air down or the heaters ability to heat the air. Roof vents can also ... air into the attic and eventually rot the roof over time if the air flow is off balance though.

What is the proper way to clean vents in your home?

Description : What is the proper way to clean vents in your home?

Last Answer : To clean vents in your home properly hire a reputable company and be sure that at least one person on the job has the proper certification. For more information visit http://www.ehow.com/way_5992729_forced-air-vent-cleaning.html.

How often should you have your vents cleaned in your home?

Description : How often should you have your vents cleaned in your home?

Last Answer : A HOME OWNER SHOULD CLEAN THEIR VENTS A MINIMUM OF THREE TIMES A YEAR. IT IS IMPORTANT FOR AIR QUALITY AND PERSONAL HEALTH.

Which of the following procedures represents the best method to prevent the freezing of batteries continuously exposed to low temperatures? A. The battery caps should be removed. B. The battery cap vents should be sealed. C. The battery should be kept in a fully charged condition. D. The battery should be disconnected from its charging source.

Description : Which of the following procedures represents the best method to prevent the freezing of batteries continuously exposed to low temperatures? A. The battery caps should be removed. B. The battery cap ... in a fully charged condition. D. The battery should be disconnected from its charging source.

Last Answer : Answer: C

How does the flow of air occur in natural draught cooling towers? a) Natural pressure head density between cold outside air and humid inside air b) Variation in pressure of both cold outside air and humid inside air c) Due to the given air vents and vacuum ports d) Because of difference in the volume of both the of airs

Description : How does the flow of air occur in natural draught cooling towers? a) Natural pressure head density between cold outside air and humid inside air b) Variation in pressure of both cold outside air and ... given air vents and vacuum ports d) Because of difference in the volume of both the of airs

Last Answer : Natural pressure head density between cold outside air and humid inside air

How does the flow of air occur in natural draught cooling towers? a) Natural pressure head density between cold outside air and humid inside air b) Variation in pressure of both cold outside air and humid inside air c) Due to the given air vents and vacuum ports d) Because of difference in the volume of both the of airs

Description : How does the flow of air occur in natural draught cooling towers? a) Natural pressure head density between cold outside air and humid inside air b) Variation in pressure of both cold outside air and ... given air vents and vacuum ports d) Because of difference in the volume of both the of airs

Last Answer : Natural pressure head density between cold outside air and humid inside air

How does outside air enter into the wet cooling system? A Air vents B Louvers. C Tuyeres D Vacuum

Description : How does outside air enter into the wet cooling system? A Air vents B Louvers. C Tuyeres D Vacuum

Last Answer : B Louvers

How does outside air enter into the wet cooling system? A] Air vents B] Louvers. C] Tuyeres D] Vacuum

Description : How does outside air enter into the wet cooling system? A] Air vents B] Louvers. C] Tuyeres D] Vacuum

Last Answer : B] Louvers.

The term _________ is traditionally used to describe steam issuing from condensate receiver vents and openended condensate discharge lines from steam traps.  a. dry steam  b. wet steam  c. phase steam  d. flash steam

Description : The term _________ is traditionally used to describe steam issuing from condensate receiver vents and openended condensate discharge lines from steam traps.  a. dry steam  b. wet steam  c. phase steam  d. flash steam

Last Answer : flash steam

Bulk of the convective heat transfer resistance from a hot tube surfaceto the fluid flowing in it, is(A) In the central core of the fluid(B) Uniformly distributed throughout the fluid(C) Mainly confined to a thin film of fluid near the surface(D) None of these

Description : Bulk of the convective heat transfer resistance from a hot tube surfaceto the fluid flowing in it, is (A) In the central core of the fluid (B) Uniformly distributed throughout the fluid (C) Mainly confined to a thin film of fluid near the surface (D) None of these

Last Answer : (C) Mainly confined to a thin film of fluid near the surface

In order to figure out what is in a sealed box, you perform some tests. The box seems heavy for its size and is harder to remove from a steel table than when placed on a concrete floor. What kind of object could be inside the box?' -Riddles

Description : In order to figure out what is in a sealed box, you perform some tests. The box seems heavy for its size and is harder to remove from a steel table than when placed on a concrete floor. What kind of object could be inside the box?' -Riddles

Last Answer : The answer is magnet because it would be really hard to move a magnet across a steel table since it would attract to the steel-not making it able to move.

Why are carpets placed on the floor of rooms?

Description : Why are carpets placed on the floor of rooms?

Last Answer : I would imagine it would be to keep your feet warm before people had worked out heating but they kept it because it's nicer to walk on then wood although I am not sure.

If used, in which direction should pinholes be placed? a. parallel to the long axis of the tooth b.parallel to the nearest external surface c. at a 15 degree angle to the long axis of the tooth d. perpendicular to the gingival floor e. directly below and parallel to restored cusp tip

Description : If used, in which direction should pinholes be placed? a. parallel to the long axis of the tooth b.parallel to the nearest external surface c. at a 15 degree angle to the long axis of the tooth d. perpendicular to the gingival floor e. directly below and parallel to restored cusp tip

Last Answer : b.parallel to the nearest external surface

Consider a hash table of size m=100 and the hash function h(k) = floor(m(kA mod 1)) for A = (√5 − 1)/2 = 0.618033. Compute the location to which the key k = 123456 is placed in hash table. (A) 77 (B) 82 (C) 88 (D) 89

Description : Consider a hash table of size m=100 and the hash function h(k) = floor(m(kA mod 1)) for A = (√5 − 1)/2 = 0.618033. Compute the location to which the key k = 123456 is placed in hash table. (A) 77 (B) 82 (C) 88 (D) 89

Last Answer : (C) 88

Compare floor inspection and centralized inspection on the basis of (i) Definition. (ii) Measuring instruments used (iii) Suitability. (iv) Mode of inspection.

Description : Compare floor inspection and centralized inspection on the basis of (i) Definition. (ii) Measuring instruments used (iii) Suitability. (iv) Mode of inspection.

Last Answer : Parameters Floor Inspection Centralized Inspection Definition. Inspection is done at the place where the part is made or assembled is called floor inspection. The inspection is done ... Mode of inspection. Online inspection is possible Offline inspection needs to be done.

Shiva has placed two radio button on a payment form designed in NetBeans to accept mode of payment one out of cash or card. -Technology

Description : Shiva has placed two radio button on a payment form designed in NetBeans to accept mode of payment one out of cash or card. -Technology

Last Answer : Shiva has forgot to attach both the radio buttons to one button group to make them mutually exclusive.

Shiva has placed two radio button on a payment form designed in NetBeans to accept mode of payment one out of cash or card. To his surprise, -Technology

Description : Shiva has placed two radio button on a payment form designed in NetBeans to accept mode of payment one out of cash or card. To his surprise, -Technology

Last Answer : Shiva has forgot to attach both the radio buttons to one button group to make them mutually exclusive.

The term single mode and multimode are best described as ∙ A. a number of fibers placed into fiber-optic cable ∙ B. the number of voice channels each fiber can support ∙ C. the number of wavelengths each fiber can support ∙ D. the index number

Description : The term single mode and multimode are best described as ∙ A. a number of fibers placed into fiber-optic cable ∙ B. the number of voice channels each fiber can support ∙ C. the number of wavelengths each fiber can support ∙ D. the index number

Last Answer : C. the number of wavelengths each fiber can support

Can underfloor heating be installed under the wooden floor ?

Description : Can underfloor heating be installed under the wooden floor ?

Last Answer : Under-floor hydronic or steam heat can certainly be installed underneath wooden floors. I have personally installed one instance of hydronic (hot water) heat system under wooden flooring, and have demolished ... heat, but I have visited such places on many occasions and found them very comfortable.

Information About Radiant Floor Heating?

Description : Information About Radiant Floor Heating?

Last Answer : Radiant floor heating has become a popular trend because of itsmany advantages. Radiant heat is beneficial to allergy sufferersdue to decrease of air borne pollutants such as dust, pollen andother ... aspect of choosing your radiant floor system is toconsider your home's original heating system,