What type of heat transfer is affected by the colour of surfaces?

What type of heat transfer is affected by the colour of surfaces?
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Pick out the wrong statement. (A) Heat transfer from a hot body to cold body by the emission of heat waves is called radiation (B) Filmwise condensation takes place on non-wettable surfaces (C) The boiling point of a solution is affected by liquid head as well as boiling point elevation (D) None of these

Description : Pick out the wrong statement. (A) Heat transfer from a hot body to cold body by the emission of heat waves is called radiation (B) Filmwise condensation takes place on non-wettable surfaces (C) The ... of a solution is affected by liquid head as well as boiling point elevation (D) None of these

Last Answer : (B) Filmwise condensation takes place on non-wettable surfaces

The overall heat transfer co-efficient for a shell and tube heat exchangerfor clean surfaces is U0 = 400 W/m2.K. The fouling factor after one year ofoperation is found to be hd0 = 2000 W/m2.K. The overall heat transfer co￾efficient at this time is(A) 1200 W/m2.K(B) 894 W/m2.K(C) 333 W/m2.K(D) 287 W/m2.K

Description : The overall heat transfer co-efficient for a shell and tube heat exchangerfor clean surfaces is U0 = 400 W/m2 .K. The fouling factor after one year of operation is found to be hd0 = 2000 W/m2 .K. The overall heat transfer co￾efficient ... 1200 W/m2 .K (B) 894 W/m2 .K (C) 333 W/m2 .K (D) 287 W/m2 .K

Last Answer : (C) 333 W/m2 .K

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)

Convective heat transfer co-efficient in case of fluid flowing in tubes is not affected by the tube length/diameter ratio, if the flow is in the __________ zone. (A) Laminar (B) Transition (C) Both 'a' & 'b' (D) Highly turbulent

Description : Convective heat transfer co-efficient in case of fluid flowing in tubes is not affected by the tube length/diameter ratio, if the flow is in the __________ zone. (A) Laminar (B) Transition (C) Both 'a' & 'b' (D) Highly turbulent

Last Answer : (D) Highly turbulent

In case of vertical tube evaporator, with increase in liquor level, the overall heat transfer co-efficient (A) Increases (B) Decreases (C) Is not affected (D) May increase or decrease; depends on the feed

Description : In case of vertical tube evaporator, with increase in liquor level, the overall heat transfer co-efficient (A) Increases (B) Decreases (C) Is not affected (D) May increase or decrease; depends on the feed

Last Answer : (B) Decreases

What type of surfaces absorbs heat?

Description : What type of surfaces absorbs heat?

Last Answer : Dark, rough, and/or porous surfaces absorb the most heat (ex.Asphalt)

Do land surfaces of earth heat more rapidly than water surfaces?

Description : Do land surfaces of earth heat more rapidly than water surfaces?

Last Answer : Yes, they do. Water has a higher "specific heat" than soil.

Choose the most important factor on which the heat conducted through a wall in a unit time will depend on? (A) Thickness of the wall (B) Area of the wall perpendicular to heat flow (C) Material of the wall (D) Temperature difference between the two surfaces of the wall

Description : Choose the most important factor on which the heat conducted through a wall in a unit time will depend on? (A) Thickness of the wall (B) Area of the wall perpendicular to heat flow (C) Material of the wall (D) Temperature difference between the two surfaces of the wall

Last Answer : (D) Temperature difference between the two surfaces of the wall

Fourier's law of heat conduction applies to __________ surfaces. (A) Isothermal (B) Non-isothermal (C) Both (A) and (B) (D) Neither (A) and (B)

Description : Fourier's law of heat conduction applies to __________ surfaces. (A) Isothermal (B) Non-isothermal (C) Both (A) and (B) (D) Neither (A) and (B)

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

Steady state one dimensional heat flow by conduction as given by Fourier's low does not assume that (A) There is no internal heat generation (B) Boundary surfaces are isothermal (C) Material is anisotropic (D) Constant temperature gradient exists

Description : Steady state one dimensional heat flow by conduction as given by Fourier's low does not assume that (A) There is no internal heat generation (B) Boundary surfaces are isothermal (C) Material is anisotropic (D) Constant temperature gradient exists

Last Answer : (C) Material is anisotropic

The visual acuity is affected by: a. pupil size b. illumination of the target c. red-green colour blindness d. contrast

Description : The visual acuity is affected by: a. pupil size b. illumination of the target c. red-green colour blindness d. contrast

Last Answer : contrast

Colour of carrot roots is affected by: a. Soil temperature b. Soil moisture c. Soil texture d. All of above

Description : Colour of carrot roots is affected by: a. Soil temperature b. Soil moisture c. Soil texture d. All of above

Last Answer : Soil moisture

Mass transfer co-efficient of liquid is (A) Affected more by temperature than that for gases (B) Affected much less by temperature than that for gases

Description : Mass transfer co-efficient of liquid is (A) Affected more by temperature than that for gases (B) Affected much less by temperature than that for gases

Last Answer : (A) Affected more by temperature than that for gases

Routine maintenance of dry-type transformers should include ______________. A. preventing the entrance of water from broken pipe lines steam lines B. keeping protective surfaces and insulating bushings free of dirt and conductive debris C. periodic testing of insulation resistance with a megger D. all of the above

Description : Routine maintenance of dry-type transformers should include ______________. A. preventing the entrance of water from broken pipe lines steam lines B. keeping protective surfaces and insulating bushings free of ... debris C. periodic testing of insulation resistance with a megger D. all of the above

Last Answer : Answer: D

What type of wear occurs due to an interaction of surfaces due to adhesion of the metals? a) Adhesive wear b) Abrasive wear c) Fretting wear d) Erosive wear

Description : What type of wear occurs due to an interaction of surfaces due to adhesion of the metals? a) Adhesive wear b) Abrasive wear c) Fretting wear d) Erosive wear

Last Answer : a) Adhesive wear

18 years old female weighting 52Kg and 163cm tall. On dental examination erosion of teeth on the most of her lingual surfaces is clearly showing. Dietary history revealed a daily rate of 5000 to 7000 Kcal/day. What is the most probable diagnosis? A. Alcoholism B. Drug abuse C. Bulimia D. Excessive smoking E. Diabetic mellitus type I

Description : 18 years old female weighting 52Kg and 163cm tall. On dental examination erosion of teeth on the most of her lingual surfaces is clearly showing. Dietary history revealed a daily rate of 5000 to 7000 ... . Alcoholism B. Drug abuse C. Bulimia D. Excessive smoking E. Diabetic mellitus type I

Last Answer : C. Bulimia

Suggest the type of cement used for the following : (i) For modular construction where form work needs to be removed early for re-use. . (ii) Mass concreting such as construction of dam. (iii) Decorative works in external surfaces of building. (iv) Cementing the oil well.

Description : Suggest the type of cement used for the following : (i) For modular construction where form work needs to be removed early for re-use. . (ii) Mass concreting such as construction of dam. (iii) Decorative works in external surfaces of building. (iv) Cementing the oil well.

Last Answer : i) For modular construction where form work needs to be removed early for reuse. – Rapid Hardening Cement ii) Mass concreting such as construction of dam. – Low heat cement. iii) Decorative works in external surfaces of building – Coloured cement. iv) Cementing the oil well. – Oil Well Cement. 

Who is most affected by heat stroke ?

Description : Who is most affected by heat stroke ?

Last Answer : Young children , older people , gymnasts or day laborers are more likely to get heat stroke. This is very frightening for children as children are more likely to have a heat stroke because ... baby with you. Older people also have weaker body heat regulation systems , which makes them vulnerable.

How the efficiency of the SI engine is affected by the specific heat ratio (γ) of the working fluid? a. the efficiency of the engine increases with increase in specific heat ratio (γ) of the working fluid b. the efficiency of the engine decreases with increase in specific heat ratio (γ) of the working fluid c. the efficiency of the engine does not affected by change in specific heat ratio (γ) of the working fluid d. none of the above

Description : How the efficiency of the SI engine is affected by the specific heat ratio (γ) of the working fluid? a. the efficiency of the engine increases with increase in specific heat ratio (γ) of the working ... not affected by change in specific heat ratio (γ) of the working fluid d. none of the above

Last Answer : ANSWER a. the efficiency of the engine increases with increase in specific heat ratio (γ) of the working fluid

Steels with high carbon equivalent have poor Weldability, because in these steels during welding (A) Carbon and other alloying elements get oxidised from the weld pool (B) Excessive ferrite forms in the heat affected zone leading to poor toughness of the weld (C) Martensite forms in the heat affected zone leading to poor toughness/ductility of the weld (D) Segregation of carbon and other element occurs in the weld pool leading to poor properties of the weld

Description : Steels with high carbon equivalent have poor Weldability, because in these steels during welding (A) Carbon and other alloying elements get oxidised from the weld pool (B) Excessive ferrite forms in the ... of carbon and other element occurs in the weld pool leading to poor properties of the weld

Last Answer : (C) Martensite forms in the heat affected zone leading to poor toughness/ductility of the weld

Cold cracking in the heat affected zone of a high strength steel weld can take place because of the (A) Retained austenite (B) Martensite formation (C) Relatively high sulphur content in the base metal (D) Sufficient hydrogen present in the welding arc

Description : Cold cracking in the heat affected zone of a high strength steel weld can take place because of the (A) Retained austenite (B) Martensite formation (C) Relatively high sulphur content in the base metal (D) Sufficient hydrogen present in the welding arc

Last Answer : (B) Martensite formation

What is the meaning of HAZ ? (i) Heat around Zone. (ii) Heat alongwith Zone (iii) Heat affected Zone* (iv) Heat added zero.

Description : What is the meaning of HAZ ? (i) Heat around Zone. (ii) Heat alongwith Zone (iii) Heat affected Zone* (iv) Heat added zero.

Last Answer : (iii) Heat affected Zone*

Why not paint/finish top surfaces that are above the sightline?

Description : Why not paint/finish top surfaces that are above the sightline?

Last Answer : Sounds like shoddy workmanship to me.

How do you remove the smell of cat urine from carpets and/or other surfaces?

Description : How do you remove the smell of cat urine from carpets and/or other surfaces?

Last Answer : Nature’s Miracle

Does doing knuckle pushups on harder surfaces really help to get harder punches ?

Description : Does doing knuckle pushups on harder surfaces really help to get harder punches ?

Last Answer : answer:Not that i know of, all it will do is build muscle and that will allow you to hit harder. If you want to make your fists more solid, you need a makiwara. you can build one with a plank of wood and some rope, like this. Just punch the makiwara for about 15 minutes each day.

Mirror, mirror, on the wall - What is your relationship with reflective surfaces?

Description : Mirror, mirror, on the wall - What is your relationship with reflective surfaces?

Last Answer : I actively avoid them except to avoid cutting my throat when shaving. I do not need constant reminders of my own ugliness.

Is there a way of fixing or touching up damage to varnished wooden surfaces?

Description : Is there a way of fixing or touching up damage to varnished wooden surfaces?

Last Answer : Depends on the mark. While I am not well versed on different finishes my Father restores antiques and passed the following on to me: If it is white and cloudy then you can take regular fireplace ... refloat the finish I would advise some restoring finish like Howards which is the easiest way to go.

What would happen if a child was raised without mirrors or reflective surfaces?

Description : What would happen if a child was raised without mirrors or reflective surfaces?

Last Answer : Hey, that’s shiny. Who’s that? Is that… OH MY GOD, HE’S COPYING ME. WHAT THE HELL. DUDE, LEAVE ME ALONE. Is this… why is he wearing my clothe… PORTAL. I HAVE FOUND A PORTAL TO ANOTHER WORLD.

Why do cats choose to curl up on what I would consider uncomfortable surfaces, instead of a more comfortable surface?

Description : Why do cats choose to curl up on what I would consider uncomfortable surfaces, instead of a more comfortable surface?

Last Answer : haha, I think you’re cats must be dumb…mine always sleep in soft areas that are usually warm…like an area of carpet near my glass sliding door that has sun shining on it….or a window seal. Or under my desk.

STL file converts curved surfaces into_______ a.Polygons b.Lines c.Surfaces d.None of the above

Description : STL file converts curved surfaces into_______ a.Polygons b.Lines c.Surfaces d.None of the above

Last Answer : a.Polygons

The nature of loading at various locations and other surfaces conditions called a.friction b.traction c.boundary condition d.surfacing

Description : The nature of loading at various locations and other surfaces conditions called a.friction b.traction c.boundary condition d.surfacing

Last Answer : c.boundary condition

The tensor product technique constraints surfaces by two curves. a.2 b.1 c.3 d.4

Description : The tensor product technique constraints surfaces by two curves. a.2 b.1 c.3 d.4

Last Answer : b.1

Which one of the following is not the law of dry friction? a.If friction is neglected, the reactions are always normal to the surfaces on contact b.Friction always acts to oppose the relative motion of the free body c.If static friction is acting, the value of the friction force may vary from zero to its maximum value d.The force of friction is always normal to the surface e.All of the above

Description : Which one of the following is not the law of dry friction? a.If friction is neglected, the reactions are always normal to the surfaces on contact b.Friction always acts to oppose the relative motion of ... its maximum value d.The force of friction is always normal to the surface e.All of the above

Last Answer : d. The force of friction is always normal to the surface

Coulomb friction is a.Friction between solids and liquids b.Friction between electrically charged bodies c.Friction between lubricated surface d.Friction between dry surfaces e.Friction between bodies having relative motion

Description : Coulomb friction is a.Friction between solids and liquids b.Friction between electrically charged bodies c.Friction between lubricated surface d.Friction between dry surfaces e.Friction between bodies having relative motion

Last Answer : d. Friction between dry surfaces

There is an island with exactly 201 residents, 100 with blue eyes, 100 with brown eyes, and the island leader (who has green eyes). To leave the island, one must know their own eye color. There are no reflective surfaces on the island and no on can communicate with each other other than the leader to the residents. No one on the island knows how many of each eye color there is. Everyone on the island is a perfect logician, meaning that if there is a solution they'll find it. Every morning the leader gives anyone a chance to leave the island by guessing their eye color. One morning, the leader gathers all 200 residents to make an announcement, he says 'at least 1 person on this island has blue eyes' How many people leave the island and in how many days after the announcement? Notes: this is

Description : There is an island with exactly 201 residents, 100 with blue eyes, 100 with brown eyes, and the island leader (who has green eyes). To leave the island, one must know their own eye color. There ... How many people leave the island and in how many days after the announcement? Notes: this is -Riddles

Last Answer : All 100 blue eyed people in 100 days. EXPLANATION: imagine there is only 1 person on the island, he will look around and see that there are no blue eyed people, he will then know his eye color in ... is needed to know their own eye color. if you would like more info, search '100 blue eyes riddle

the four terrestrial planets that have solid, rocky surfaces are -General Knowledge

Description : the four terrestrial planets that have solid, rocky surfaces are -General Knowledge

Last Answer : The four terrestrial planets that have solid, rocky surfaces are: Mercury, Venus, Earth, and Mars.

What is the number of surfaces of a right circular cylinder ? -Maths 9th

Description : What is the number of surfaces of a right circular cylinder ? -Maths 9th

Last Answer : Number of surfaces of right circular cylinder are three.

If three cylinders of radius r and height h are placed vertically such that the curved surface of each cylinder touches the curved surfaces -Maths 9th

Description : If three cylinders of radius r and height h are placed vertically such that the curved surface of each cylinder touches the curved surfaces -Maths 9th

Last Answer : hr2 (3-√−π2)(3−π2) The bases of the three cylinders when placed as given are as shown in the figure : Let the radius of the base of each cylinder = r cm. We are required to find the volume of air. ... ∠C = 60º) = 3 x 60o360o πr2=πr2260o360o πr2=πr22 ∴ Required volume = (3-√r2−π2r2)h=(3-√−π2)r2h.

A sphere, a cylinder and a cone respectively are of the same radius and same height. Find the ratio of their curved surfaces. -Maths 9th

Description : A sphere, a cylinder and a cone respectively are of the same radius and same height. Find the ratio of their curved surfaces. -Maths 9th

Last Answer : answer:

If two rectangular sheets each of dimensions 2x and 2y form the curved surfaces of two different cylinders, then the ratio -Maths 9th

Description : If two rectangular sheets each of dimensions 2x and 2y form the curved surfaces of two different cylinders, then the ratio -Maths 9th

Last Answer : answer:

When describing image formation for flat shiny surfaces what is an important rule to remember about light rays?

Description : When describing image formation for flat shiny surfaces what is an important rule to remember about light rays?

Last Answer : The angle when it leaves is the same as the angle when it hits

How much surfaces does the earth have?

Description : How much surfaces does the earth have?

Last Answer : the surface of the moon is 0.074 of earth's surface area

Which of the following surfaces reflects the most light?

Description : Which of the following surfaces reflects the most light?

Last Answer : Aluminum Foil

Which surfaces should be cleaned with a pressure washer?

Description : Which surfaces should be cleaned with a pressure washer?

Last Answer : Powerwashers should only be used on hard surfaces. You should use power washers on materials like concrete, tar, stone, and other materials that are strong.

Silver (atomic weight `108 g mol^(-1))` has a density of `10.5 g cm^(-3)`. The number of silver atoms on a surfaces of area `10^(-12) m^(2)` can be ex

Description : Silver (atomic weight `108 g mol^(-1))` has a density of `10.5 g cm^(-3)`. The number of silver atoms on a surfaces of area `10^(-12) m^(2)` can be ex

Last Answer : Silver (atomic weight `108 g mol^(-1))` has a density of `10.5 g cm^(-3)`. The number of silver atoms on a ... `Y xx 10^(-x)`, The value of `x` is .

_____joints are characterised by the presence of a fluid filled synovial cavity between the articulating surfaces of the two bones.

Description : _____joints are characterised by the presence of a fluid filled synovial cavity between the articulating surfaces of the two bones.

Last Answer : _____joints are characterised by the presence of a fluid filled synovial cavity between the articulating surfaces of the two bones.

The two surfaces of a double concave lens are of curvature 10 cm and 40 cm. Find the focal length of the lens in water. The refractive index of water

Description : The two surfaces of a double concave lens are of curvature 10 cm and 40 cm. Find the focal length of the lens in water. The refractive index of water

Last Answer : The two surfaces of a double concave lens are of curvature 10 cm and 40 cm. Find the focal length of ... and that of the lens of the material is 3/2.

Can HBV survive on environmental surfaces dried at room temperature foe eight hours?

Description : Can HBV survive on environmental surfaces dried at room temperature foe eight hours?

Last Answer : Need answer

What is called The total area of all surfaces or an object?

Description : What is called The total area of all surfaces or an object?

Last Answer : Need answer

Are the surfaces of the cerebral hemispheres covered with gray matter and are known as the cerebral cortex?

Description : Are the surfaces of the cerebral hemispheres covered with gray matter and are known as the cerebral cortex?

Last Answer : Need answer