Film condensation is promoted on a/an __________ surface. (A) Oily (B) Coated (C) Clean & smooth (D) Dirty

Film condensation is promoted on a/an __________ surface.

(A) Oily

(B) Coated

(C) Clean & smooth

(D) Dirty


by

1 Answer

Answer :

(C) Clean & smooth


by

Related questions

Dropwise condensation is promoted on a/an __________ surface. (A) Glazed (B) Oily (C) Coated (D) Smooth

Description : Dropwise condensation is promoted on a/an __________ surface. (A) Glazed (B) Oily (C) Coated (D) Smooth

Last Answer : (B) Oily

The most conducive surface for dropwise condensation to occur is the __________ surface. (A) Coated (B) Oily (C) Glazed & polished (D) Smooth

Description : The most conducive surface for dropwise condensation to occur is the __________ surface. (A) Coated (B) Oily (C) Glazed & polished (D) Smooth

Last Answer : (B) Oily

Dropwise condensation occurs on __________ surfaces. (A) Clean and dirt free (B) Smooth clean (C) Contaminated cooling (D) Polished

Description : Dropwise condensation occurs on __________ surfaces. (A) Clean and dirt free (B) Smooth clean (C) Contaminated cooling (D) Polished

Last Answer : (C) Contaminated cooling

The film thickness for laminar film condensation on vertical surface __________ from top to bottom. (A) Cumulatively increases (B) Cumulatively decreases (C) Remain constant (D) And the surface conductance increase

Description : The film thickness for laminar film condensation on vertical surface __________ from top to bottom. (A) Cumulatively increases (B) Cumulatively decreases (C) Remain constant (D) And the surface conductance increase

Last Answer : (A) Cumulatively increases

The local surface conductance for laminar film condensation on vertical surface is (where, t = film thickness) (A) ∝ t (B) ∝ 1/t (C) ∝ √t (D) Independent of 't

Description : The local surface conductance for laminar film condensation on vertical surface is (where, t = film thickness) (A) ∝ t (B) ∝ 1/t (C) ∝ √t (D) Independent of 't

Last Answer : (B) ∝ 1/t

Pick out the correct statement about the condensation. (A) Filmwise condensation gives a lower heat transfer rate than the dropwise condensation (B) Suitable coating or vapour additive is used to promote film wise condensation (C) If a condensing liquid does not wet the surface dropwise, even then condensation will take place on it (D) Reynolds number of condensing liquid is based on its mass flow rate

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Last Answer : (B) Suitable coating or vapour additive is used to promote film wise condensation

Fouling factor for a heat exchanger is given by (where, U1 = heat transfer co-efficient of dirty surface U2 = heat transfer co-efficient of clean surface). (A) U1 - U2 (B) 1/U1 - 1/U2 (C) 1/U2 - 1/U1 (D) U2 - U1

Description : Fouling factor for a heat exchanger is given by (where, U1 = heat transfer co-efficient of dirty surface U2 = heat transfer co-efficient of clean surface). (A) U1 - U2 (B) 1/U1 - 1/U2 (C) 1/U2 - 1/U1 (D) U2 - U1

Last Answer : (B) 1/U1 - 1/U2

If air (a non-condensing gas) is present in a condensing vapor stream, it will __________ the condensation rate of vapor. (A) Increase (B) Decrease (C) Not affect (D) Increase the condensing film co-efficient as well as

Description : If air (a non-condensing gas) is present in a condensing vapor stream, it will __________ the condensation rate of vapor. (A) Increase (B) Decrease (C) Not affect (D) Increase the condensing film co-efficient as well as

Last Answer : (B) Decrease

The heat transfer co-efficient in film type condensation is __________ that for dropwise condensation. (A) Greater than (B) Lower than (C) Is same as (D) Half

Description : The heat transfer co-efficient in film type condensation is __________ that for dropwise condensation. (A) Greater than (B) Lower than (C) Is same as (D) Half

Last Answer : (B) Lower than

A __________ surface has the maximum thermal emissivity out of the following. (A) Black & smooth (B) Black & rough (C) White & smooth (D) White & rough

Description : A __________ surface has the maximum thermal emissivity out of the following. (A) Black & smooth (B) Black & rough (C) White & smooth (D) White & rough

Last Answer : (B) Black & rough

The tear film: a. has a higher pH than the serum b. has a lower concentration of glucose than the serum c. the oily component is secreted by the meibomian glands d. all above

Description : The tear film: a. has a higher pH than the serum b. has a lower concentration of glucose than the serum c. the oily component is secreted by the meibomian glands d. all above

Last Answer : all above

Can't get rid of acne problem at all , details inside ? Bron problem for almost two years. The skin has become black due to the brown spots. I have taken various treatments at different times to solve this problem but it did not work . The skin has started to be free of acne. I will use any face wash to keep my skin acne free , oily free and clean. Experts suggest that. With the name , price and detailed information of face wash. I waited for the answer. Note: I am 16 years old, thank you in advance ,,,,,,,,,

Description : Can't get rid of acne problem at all , details inside ? Bron problem for almost two years. The skin has become black due to the brown spots. I have taken various treatments at different times to solve this problem ... I waited for the answer. Note: I am 16 years old, thank you in advance ,,,,,,,,,

Last Answer : : You can use Assure facewash for your problem . And the price of facewash is not known. However, it seems to be between 250 to 300 rupees.

Condensing film co-efficient for steam on horizontal tubes ranges from 5000 to 15000 Kcal/hr.m2 .°C. Condensation of vapor is carried out inside the tube in a shell and tube heat exchanger, when the (A) Higher condensing film co-efficient is desired (B) Condensate is corrosive in nature (C) Lower pressure drop through the exchanger is desired (D) Temperature of the incoming vapor is very high Answer: Option B

Description : Condensing film co-efficient for steam on horizontal tubes ranges from 5000 to 15000 Kcal/hr.m2 .°C. Condensation of vapor is carried out inside the tube in a shell and tube heat ... drop through the exchanger is desired (D) Temperature of the incoming vapor is very high

Last Answer : (B) Supersaturated

Presence of a non-condensing gas in a condensing vapour (A) Increases the rate of condensation (B) Decreases thermal resistance (C) Is desirable to increase the film co-efficient (D) None of these

Description : Presence of a non-condensing gas in a condensing vapour (A) Increases the rate of condensation (B) Decreases thermal resistance (C) Is desirable to increase the film co-efficient (D) None of these

Last Answer : (D) None of these

Condensation polymerisation of __________ produces Bakelite. (A) Propylene (B) Phenol & formaldehyde (C) Phenol & acetaldehyde (D) Urea & formaldehyde

Description : Condensation polymerisation of __________ produces Bakelite. (A) Propylene (B) Phenol & formaldehyde (C) Phenol & acetaldehyde (D) Urea & formaldehyde

Last Answer : (B) Phenol & formaldehyde

Removal of __________ heat is involved in the condensation of a vapor under saturated conditions. (A) Super (B) Sensible (C) Latent (D) Both (B) & (C)

Description : Removal of __________ heat is involved in the condensation of a vapor under saturated conditions. (A) Super (B) Sensible (C) Latent (D) Both (B) & (C)

Last Answer : (B) Sensible

Moist air is cooled along the line of constant __________ , when it is passed over a cold & dry cooling coil, such that no condensation occurs? (A) Enthalpy (B) Relative humidity (C) Wet bulb temperature (D) Dew point temperature

Description : Moist air is cooled along the line of constant __________ , when it is passed over a cold & dry cooling coil, such that no condensation occurs? (A) Enthalpy (B) Relative humidity (C) Wet bulb temperature (D) Dew point temperature

Last Answer : (D) Dew point temperature

Growth of __________ is promoted by the presence of manganese in water. (A) Files (B) Algae (C) Micro-organisms (D) Mosquitoes

Description : Growth of __________ is promoted by the presence of manganese in water. (A) Files (B) Algae (C) Micro-organisms (D) Mosquitoes

Last Answer : (C) Micro-organisms

Which of the following is not a characteristic observed in material failure by fatigue fracture? (A) Plastic deformation of material does not occur (B) Initiation of crack from below the surface does not occur (C) Initiation of crack occurs on the surface of the machine part (D) Presence of both rough & smooth zone with conchoidal markings in smooth zone of the surface

Description : Which of the following is not a characteristic observed in material failure by fatigue fracture? (A) Plastic deformation of material does not occur (B) Initiation of crack from below the surface does ... (D) Presence of both rough & smooth zone with conchoidal markings in smooth zone of the surface

Last Answer : Option B

In turbulent flow, a rough pipe has the same friction factor as a smooth pipe (A) In the zone of complete turbulence (B) When the roughness projections are much smaller than the thickness of the laminar film (C) Everywhere in the transition zone (D) When the friction factor is independent of the Reynold's number

Description : In turbulent flow, a rough pipe has the same friction factor as a smooth pipe (A) In the zone of complete turbulence (B) When the roughness projections are much smaller than the thickness of ... ) Everywhere in the transition zone (D) When the friction factor is independent of the Reynold's number

Last Answer : (B) When the roughness projections are much smaller than the thickness of the laminar film

In the complete turbulence zone (in rough pipes), the (A) Rough and smooth pipes have the same friction factor (B) Laminar film covers the roughness projections (C) Friction factor depends upon NRe only (D) Friction factor is independent of the relative roughness

Description : In the complete turbulence zone (in rough pipes), the (A) Rough and smooth pipes have the same friction factor (B) Laminar film covers the roughness projections (C) Friction factor depends upon NRe only (D) Friction factor is independent of the relative roughness

Last Answer : (D) Friction factor is independent of the relative roughness

Water drops cannot stick to the oily surface due to – (1) lack of adhesive force (2) surface tension (3) cannot mix each other (4) water is lighter than oil

Description : Water drops cannot stick to the oily surface due to – (1) lack of adhesive force (2) surface tension (3) cannot mix each other (4) water is lighter than oil

Last Answer : (2) surface tension Explanation: The separation of oil and water is caused due to the difference in surface tension of the two liquids. The water molecules stick together tightly and does not mix ... to each other very strongly, forming an invisible "skin" of surface tension around each drop.

Water drop cannot stick to the oily surface due to

Description : Water drop cannot stick to the oily surface due to

Last Answer : lack of adhesive force

Water drop cannot stick to the oily surface due to

Description : Water drop cannot stick to the oily surface due to

Last Answer : lack of adhesive force

Water drops cannot stick to the oily surface due to (1) lack of adhesive force (2) surface tension (3) cannot mix each other (4) water is lighter than oil

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Last Answer : surface tension

Filter aids like asbestos, kieselguhr, diatomaceous earth etc. are used to increase the porosity of the final filter cake & reducing the cake resistance during filtration. Filter aid is (A) Added to the feed slurry (B) Pre-coated on the filter medium prior to filtration (C) Separated from the cake by dissolving solids or by burning it off (D) All 'a', 'b' & 'c'

Description : Filter aids like asbestos, kieselguhr, diatomaceous earth etc. are used to increase the porosity of the final filter cake & reducing the cake resistance during filtration. Filter aid is (A) Added to the feed slurry (B) Pre ... the cake by dissolving solids or by burning it off (D) All 'a', 'b' & 'c'

Last Answer : (D) All 'a', 'b' & 'c'

Pick out the correct statement. (A) Noise from ball mills can be dealt with by fibre glass lined enclosures (B) Noise from vibrating chutes can be reduced by lining the metallic chute with rubber (C) Noise of conveyor belt system is reduced by using urethane coated cloth conveyor belts and rubber/plastic covered metallic rollers (D) All (A), (B) & (C)

Description : Pick out the correct statement. (A) Noise from ball mills can be dealt with by fibre glass lined enclosures (B) Noise from vibrating chutes can be reduced by lining the metallic chute with rubber (C) Noise ... cloth conveyor belts and rubber/plastic covered metallic rollers (D) All (A), (B) & (C)

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

In mirrors the back surface is coated with a thin layer of (1) Mercury (2) Silver (3) Red oxide (4) Silver nitrate

Description : In mirrors the back surface is coated with a thin layer of (1) Mercury (2) Silver (3) Red oxide (4) Silver nitrate

Last Answer : (2) Silver Explanation: In a spherical mirror, one of the two curved surfaces is coated with a thin layer of silver followed by a coating of red lead oxide paint. Thus, one side of the spherical minor is opaque and the other side is a highly polished reflecting surface.

In mirrors the back surface is coated with a thin layer of : (1) Mercury (2) Silver (3) Red oxide (4) Silver nitrate

Description : In mirrors the back surface is coated with a thin layer of : (1) Mercury (2) Silver (3) Red oxide (4) Silver nitrate

Last Answer : Silver

Have you ever looked at something so dirty that you were scared to clean it?

Description : Have you ever looked at something so dirty that you were scared to clean it?

Last Answer : Nothing is do dirty that it can't be cleaned (or attempted). Yes, you should wipe the ceiling fan blades off. Put a sheet or something on the floor. For that matter, you should wipe or ... unbalanced which is, itself, a problem. Curiosity: when was the last time these blades were cleaned? Ever?

Does anyone have separate laundry baskets for clean and dirty clothes?

Description : Does anyone have separate laundry baskets for clean and dirty clothes?

Last Answer : No.

Laundry for Bacheloriods: how do you clean a pair of really dirty pants?

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Last Answer : answer:I'm wondering what kind of detergent you're using and whether your machine has a soak cycle on it. I would recommend pre-treating the dirtiest areas with a something like Resolve/Spray ... cycle. If that fails to get the grime out, then you might consider having them professionally cleaned.

If you had limited time to clean a dirty and cluttered house, what would you recommend cleaning or doing to prepare for company?

Description : If you had limited time to clean a dirty and cluttered house, what would you recommend cleaning or doing to prepare for company?

Last Answer : answer:Concentrate on the rooms the visitor will be in: the living room, dining room, bathroom. Close the bedroom doors. I would say pick up the debris.

I'm looking for the "Dirty Dozen" and the "Clean Fifteen" Many websites refer to it, but I can't find the government link. Help?

Description : I'm looking for the "Dirty Dozen" and the "Clean Fifteen" Many websites refer to it, but I can't find the government link. Help?

Last Answer : answer:http://www.ewg.org/foodnews/ Looks like it a privately published listing.

Is it worse to be clean and messy or dirty and tidy?

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Last Answer : I would rather be (and often am) clean but messy.

Do you use separate baskets for clean and dirty laundry?

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Last Answer : No but that’s because it’s a big plastic bin. If it were a cloth bag then I’d keep them separated between washings. Unless your clothes have moist, seeping guck on them then I can’t see why your husband thinks the clothes get contaminated/dirty.

Do you have a link to the clean dozen (or more than a dozen) when it comes to food? I know the dirty dozen ...

Description : Do you have a link to the clean dozen (or more than a dozen) when it comes to food? I know the dirty dozen ...

Last Answer : I'm not sure if I understand what you mean by the dirty and clean dozen. I'm assuming you are asking for healthy foods. If so here's a link with 100 of the healthiest foods listed and here's a ... list of foods that are supposed to help ward off a whole host of diseases. The so called super-foods.

What's the best way to clean a dirty cast iron stove top?

Description : What's the best way to clean a dirty cast iron stove top?

Last Answer : Describe the nature of the dirt. (Not rust?)

What's the best way to clean dirty bicycle chain oil from chair upholstery?

Description : What's the best way to clean dirty bicycle chain oil from chair upholstery?

Last Answer : You are hosed. Try OxiClean.

Why put a towel in the dirty clothes basket if when you get out of the shower you are clean?

Description : Why put a towel in the dirty clothes basket if when you get out of the shower you are clean?

Last Answer : Mildew forms after a while. Towels need to be washed frequently.

Dirty coffee mug? Or clean?

Description : Dirty coffee mug? Or clean?

Last Answer : Isn’t this the coffee equivalent of someone tripping and saying, “I meant to do that”? I am guilty as charged—I wash out my tea mug only when it starts to get discolored—but that’s only because I’m a total slob.

Bar goers, why are so many people drawn to sit at dirty bar seats instead of clean ones?

Description : Bar goers, why are so many people drawn to sit at dirty bar seats instead of clean ones?

Last Answer : To keep the clean ones open for the ladies to sit next to you.

If you drop the soap on the floor, is the floor clean or the soap dirty? -Riddles

Description : If you drop the soap on the floor, is the floor clean or the soap dirty? -Riddles

Last Answer : It depends on the floor.

A farmer has never taken a shower in his life. He gets dirty every day, wears no cleansing scents, and is always clean at the end of the day. How is this possible? -Riddles

Description : A farmer has never taken a shower in his life. He gets dirty every day, wears no cleansing scents, and is always clean at the end of the day. How is this possible? -Riddles

Last Answer : The farmer takes a bath every day.

I have hundreds of legs but I can only lean;You make me feel dirty so you feel clean.What am I? -Riddles

Description : I have hundreds of legs but I can only lean;You make me feel dirty so you feel clean.What am I? -Riddles

Last Answer : A Broom.

I'm clean when I'm black, Dirty when white; Get too close, And you might sneeze. What am I? -Riddles

Description : I'm clean when I'm black, Dirty when white; Get too close, And you might sneeze. What am I? -Riddles

Last Answer : A Chalkboard.

I am white when I am dirty, and black when I am clean. What am I? -Riddles

Description : I am white when I am dirty, and black when I am clean. What am I? -Riddles

Last Answer : A blackboard.

How do you clean a dirty tuba? -Riddles

Description : How do you clean a dirty tuba? -Riddles

Last Answer : With a tuba toothpaste!

What is black when it’s clean and white when it’s dirty? -Riddles

Description : What is black when it’s clean and white when it’s dirty? -Riddles

Last Answer : A chalkboard is black when it’s clean and white when it’s dirty.

How to correct this sentence get them dirty dogs off of my clean sofa shouted nana?

Description : How to correct this sentence get them dirty dogs off of my clean sofa shouted nana?

Last Answer : ¨Get them (those) dirty dogs off my clean sofa!¨ Shouted Nana