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H

Hrhrh 18 May in  GATE Coaching classes

What are two essential conditions of perfect gas ?

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Harikrishnan Chandrasekhar replied | 27 May

Cp and cv are constant

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Pranav 18 May in  GATE Coaching classes

Enthalpy and entropy are functions of one single parameter. Which is that ?

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Busigari Rajasekhar Reddy replied | 08 Jun

Temperature

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A

Akash 18 May in  GATE Coaching classes

Why rate of condensation is higher on a polished surface compared to rusty surface ?

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Siddhartha replied | 04 Jun

Polished means smooth, meaning lesser roughness - that is, condensed droplets don't remain held/collected on the surface, and rather easily get drained off. This is opposite to what happens on rusty surface which has significant corrosion and corresponding roughening which tries to hold condensed droplets. Water held on the surface cuts heat transfer from vapor to the cool metal...  more»
Polished means smooth, meaning lesser roughness - that is, condensed droplets don't remain held/collected on the surface, and rather easily get drained off. This is opposite to what happens on rusty surface which has significant corrosion and corresponding roughening which tries to hold condensed droplets. Water held on the surface cuts heat transfer from vapor to the cool metal surface thereby reducing condensation. in case of smooth surfaces/ polished ones, droplets drain immediately exposing the metal surface to vapor, thereby causing efficient heat transfer and augmented condensation rate. «less

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Y

Yuvraj 18 May in  GATE Coaching classes

 How much resistance is offered to heat flow by drop wise condensation ?

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Busigari Rajasekhar Reddy replied | 08 Jun

Obviously less than film wise condensation. It will be on the order of 10^3

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P

Prakash 17 May in  GATE Coaching classes

Describe briefly the different cold drawing processes.

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Dr. Ramana replied | 06 Jun

Cold working is the plastic deformation of metals below the recrystallization temperature. In most cases, such cold forming is done at room temperature. The major cold-working operations can be classified basically as squeezing, bending, shearing and drawing

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S

Sreeja 17 May in  GATE Coaching classes

What are the different theories of failure under static load, explain briefly?

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Dr. Ramana replied | 06 Jun

Maximum shear stress theory, Maximum principal stress theory and maximum distortion (vonMises) theory

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V

Vineeth 17 May in  GATE Coaching classes

What is the difference between scavenging and supercharging ?

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Nitish replied | 17 May

Scavenging is when d left out gases in combustion chamber is used after combustion while supercharging is providing rich mixture for combustion

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D

Divya 17 May in  GATE Coaching classes

What are the names given to constant temperature, constant pressure, constant volume, constant internal energy, constant enthalpy, and constant entropy processes.

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Debajyoti replied | 01 Jun

Constant Temperature : Isothermal
Pressure: Isobaric
Volume: Isochoric
Internal energy remains constant in Isothermal Process as it is a function of temperature. Entropy remains constant only in reversible processes. You can also call a process where entropy remains constant as Isentropic.

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P

Praneeth 17 May in  GATE Coaching classes

In a Rankine cycle if maximum steam pressure is increased keeping steam temperature and condenser pressure same, what will happen to dryness fraction of steam after expansion ?

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Prem replied | 23 May

Dryness fraction will decrease continuously..but up to some fixed value of 0.88 we fixed the condition..for better health of condenser...

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T

Tripti 16 May in  GATE Coaching classes

What are the points that should be kept in mind during forging design?

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Divyesh replied | 04 Jul

The points that should be followed while forging design are:
> A radial flow of grains or fibers must be achieved in the forged components.
> The forged items such as drop and press forgings should have a parting line that should divide the forging into two equal halves.
> The ribs in a forging should not be high or thin.
> In order to avoid increased die...  more»
The points that should be followed while forging design are:
> A radial flow of grains or fibers must be achieved in the forged components.
> The forged items such as drop and press forgings should have a parting line that should divide the forging into two equal halves.
> The ribs in a forging should not be high or thin.
> In order to avoid increased die wear the pockets and recesses in forgings should be minimum.
> In forgings the parting line of it should lie as far as possible in a single plane.
> For ease of forging and easy removal of forgings the surfaces of the metal should contain sufficient drafts. «less

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Divyesh replied | 04 Jul

Some of the points that should be followed while forging design are:
> A radial flow of grains or fibers must be achieved in the forged components.
> The forged items such as drop and press forgings should have a parting line that should divide the forging into two equal halves.
> The ribs in a forging should not be high or thin.
> In order to avoid increased...  more»
Some of the points that should be followed while forging design are:
> A radial flow of grains or fibers must be achieved in the forged components.
> The forged items such as drop and press forgings should have a parting line that should divide the forging into two equal halves.
> The ribs in a forging should not be high or thin.
> In order to avoid increased die wear the pockets and recesses in forgings should be minimum.
> In forgings the parting line of it should lie as far as possible in a single plane.
> For ease of forging and easy removal of forgings the surfaces of the metal should contain sufficient drafts. «less

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Answer

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K

Keerthiga 16 May in  GATE Coaching classes

What are the different types of fits? Explain?

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Phoenix Edu Solutions replied | 01 Jul

On the basis of Indian standards fits can mainly be categorized into three groups: > Clearance Fit: These types of fits are characterized by the occurrence of a clearance between the two mating parts. The difference between the minimum size of the hole and the maximum size of the shaft is called the minimum clearance, the difference between the maximum size of the hole and the minimum...  more»
On the basis of Indian standards fits can mainly be categorized into three groups: > Clearance Fit: These types of fits are characterized by the occurrence of a clearance between the two mating parts. The difference between the minimum size of the hole and the maximum size of the shaft is called the minimum clearance, the difference between the maximum size of the hole and the minimum size of the shaft is known as maximum clearance. > Interference Fit: In these types of fits the size of the mating parts are predefined so that interference between them always occurs. The tolerance zone of the hole is completely below the tolerance zone of the shaft. > Transition Fit: As the name suggests these type of fit has its mating parts sized limited to allow either clearance or interference. The tolerance zone of the hole and the shaft overlaps in case of such fits. For a shaft designated as 40 H8/f7, calculate the tolerances. Given: Shaft designation = 40 H8/f7 The shaft designation 40 H8/f 7 means that the basic size is 40 mm and the tolerance grade for the hole is 8 ( i. e. I T 8) and for the shaft is 7 ( i. e. I T 7). Since 40 mm lies in the diameter steps of 30 to 50 mm, therefore the geometric mean diameter, D = Square root of (30 x 50) = 38.73 mm We know that standard tolerance unit, i = 0.45 x Cube root of (D) + 0.001 D i = 0.45 � 3.38 + 0.03873 = 1.559 73 or 1.56 microns i = 1.56 � 0.001 = 0.001 56 mm ...(1 micron = 0.001 mm) The standard tolerance for the hole of grade 8 (IT8) = 25 i = 25 � 0.001 56 = 0.039 mm The standard tolerance for the shaft of grade 7 (IT7) = 16 i = 16 � 0.001 56 = 0.025 mm «less

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Nikhil 16 May in  GATE Coaching classes

What are the factors that can affect the Factor of safety selection?

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Phoenix Edu Solutions replied | 01 Jul

properties of the material used, accuracy and authenticity of test results,service life period,applied load reliability,limit of stresseslimit of initial stresses at the time period of manufacture,

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V

Vikash 16 May in  GATE Coaching classes

What is heat treatment and why is it done?

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Ashish Rajoriya replied | 09 Jun

Heat treatment is a stress
relieving process, by maintaining it composition but by changing the crystals structure of material.
It help to material retaining it's physical properties like strength and ductility

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Answer

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M

Mrs 16 May in  GATE Coaching classes

What are the rules that must be kept in mind while designing castings?

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Phoenix Edu Solutions replied | 02 Jul

1. To avoid the concentration of stresses sharp corners and frequent use of fillets should be avoided.
2. Section thicknesses should be uniform as much as possible. For variations it must be done gradually.
3. Abrupt changes in the thickness should be avoided at all costs.
4.Simplicity is the key, the casting should be designed as simple as possible.
5.It...  more»
1. To avoid the concentration of stresses sharp corners and frequent use of fillets should be avoided.
2. Section thicknesses should be uniform as much as possible. For variations it must be done gradually.
3. Abrupt changes in the thickness should be avoided at all costs.
4.Simplicity is the key, the casting should be designed as simple as possible.
5.It is difficult to create true large spaces and henceforth large flat surfaces must be avoided.
6. Webs and ribs used for stiffening in castings should as minimal as possible.
7. Curved shapes can be used in order to improve the stress handling of the cast.
8. In case of Sand Molding ensure that the sand is within dry and wet strength
9. There should be air passage in the Mold «less

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Divyesh replied | 04 Jul

Points that must be kept in mind during the process of cast designing are as follows:

> To avoid the concentration of stresses sharp corners and frequent use of fillets should be avoided.

> Section thicknesses should be uniform as much as possible. For variations it must be done gradually.

> Abrupt changes in the thickness should be avoided at all...  more»
Points that must be kept in mind during the process of cast designing are as follows:

> To avoid the concentration of stresses sharp corners and frequent use of fillets should be avoided.

> Section thicknesses should be uniform as much as possible. For variations it must be done gradually.

> Abrupt changes in the thickness should be avoided at all costs.

> Simplicity is the key, the casting should be designed as simple as possible.

> It is difficult to create true large spaces and henceforth large flat surfaces must be avoided.

> Webs and ribs used for stiffening in castings should as minimal as possible.

> Curved shapes can be used in order to improve the stress handling of the cast. «less

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P

Phaninder 16 May in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

I need Gate home tutors or coaching centres in vizag

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Answer

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T

Trupti 15 May in  GATE Coaching classes

Are online GATE classes much costlier than home classes?

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Surya replied | 17 May

Hi Trupti. According to my experience home classes are costlier than online classes/group tution/coaching. If you are really interested in taking GATE, I would rather suggect you to join one of the best coaching in India like Ace, Made Easy and Vani. I am a teacher/researcher and I charge same for private tution (GATE) as well as for GATE coaching too.

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A

Ajay 15 May in  GATE Coaching classes

In a mortar, the binding material is………………….

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Lokesh replied | 04 Jul

Cement has binding nature because of its contents. They are Silica, Aluminium, Iron and other material like ash.

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M

Manchala 15 May in  GATE Coaching classes

A pitot tube is used to measure………………….

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Sumanth replied | 15 May

fluid flow

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U

Utpal 15 May in  GATE Coaching classes

he maximum vacuum created at the summit of a syphon is……………….

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Phoenix Edu Solutions replied | 02 Jul

7.4 m of water

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S

S 15 May in  GATE Coaching classes

If the atmospheric pressure on the surface of an oil tank (sp. gr. 0.8) is 0.1 kg/cm2, the pressure at a depth of 2.5 m, is………………

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P Yashwanth replied | 19 Jun

when converted the atmospheric pressure is 100,000 Pa. Using pascals law the pressure at depth of 2.5 m will be summation of both atm pressure and the pressure by the oil.pressure exerted by the fluid will be P=0.8*9.81*2.5=19620 Pa.The total pressure will be 119,620Pa

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M

Mangesh 13 May in  GATE Coaching classes

Show previous answers

Neetu replied | 06 Jul

all IITs and NITS

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Koushik replied | 03 Aug

IIT kgp and ROORkee

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S

Satpal 14 May in  GATE Coaching classes

Is there any online coaching available for GATE subjects?

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N

Naresh replied | 26 Jun

Yes. Which subjects do u want .. I I will train you E. C E Subjects.. .

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S Ravan replied | 28 Jun

Yes, I teach EE.

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Niyajuddin 14 May in  GATE Coaching classes

Name some top GATE coaching classes in Mumbai?

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Lokesh replied | 07 Jul

GATE CS/IT Vidya CS Academy for CSE

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Arpit replied | 09 Jul

Elite Academy

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R

Rituparna 14 May in  GATE Coaching classes

Name some top GATE coaching classes in Delhi?

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Sakshi replied | 14 May

made easy

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K

Kaushal 14 May in  GATE Coaching classes

How can I get admission for Mtech in IIT?

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Santosh replied | 14 May

GATE, or more then 90% Marks in B.Tech

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