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Mechanical Engineering

Mechanical Engineering is a branch of engineering that encompasses the generation and application of heat and mechanical power and the design, production, and use of machines and tools. Mechanical engineering involves application of the principles of dynamics, control, thermodynamics and heat transfer, fluid mechanics, strength of materials, materials science, electronics, and mathematics.

10,989 Questions

Can someone tell me what kind of automatic level I have. Cant find any information on it anywhere. Its a East Coast Instruments ECI-240 Magn 24x stadia 100 1 Light grey in color and works just fine.?

It's seems as though you have answered the question yourself. You have stated exactly what it is (manufacture and model number). It was made in China and their exclusive distributor here in the US is "Instrument Sales & Service" out of Wilmington, DE. In case you need it, their number is 1-800-874-7637.

How boiler feed valve works?

There are automatic boiler feeder and manual feeds and depending on the desired working pressure required that would determine the "SET" pressure of the feeder

What is crca material?

CRCA - Cold Rolled Close Annealed Sheet Steel.

Difference between 10.9 and 12.9 tensile bolts?

Grade 10.9 bolts or capscrews have a minimum tensile strength of 1040N/mm2 and a hardness of 320 - 380Hv10.

Grade 12.9 bolts or capscrews have a minimum tensile strength of 1220N/mm2 and a hardness of 385 - 435Hv10.

The 12.9 fastener is therefore a higher grade (hardness and tensile strength) fastener compared with 10.9 grade

What are the uses of air vessels in a reciprocating pump?

to maintain speed of the pump without sepration......call me on 8439332784

How do you calculate tool life of a single point cutting tool or any mathematical example?

n is found by using experimental data.

The whole point of Taylor's tool life equation is to predict the tool life for different spindle speeds.

Why does the existence of a cutoff frequency in the photoelectric effect favor a particle theory of light rather than a wave theory?

According to the wave theory, light of any frequency can cause electrons to be ejected as

long as the light is intense enough. A higher intensity corresponds to a greater electric

field magnitude and more energy. Therefore, there should be no frequency below which

the photoelectric effect does not occur. According to the particle theory, however, each

photon carries an amount of energy that depends upon its frequency. Increasing the

intensity of the light increases the number of photons but does not increase the energy of

the individual photons. The cutoff frequency is that frequency at which the energy of the

photon equals the work function. If the frequency of the incoming light is below the

cutoff, the electrons will not be ejected because no individual photon has enough energy

to impart to an electron.

How do you calculate heating demand using heating degree days?

H.D.D. are a measurement of the degrees below a selected temperature (65) for determining how much heat will be needed for a dwelling. It does not really give a heating demand number, but rather a fuel demand to maintain that comfort zone. To calculate heating demand, as in furnace sizing, much more info about the building is used.

What is the Rockwell hardness of s-7 tool steel?

S7 tool steel is produced and supplied to the machinist or tool maker in the annealed or soft condition. S-7 is typically heat treated and used in the Rockwell C hardness range of RC 54-59. Form more specific information about S-7 tool steel and heat treating, see the related links below.

Does low suction pressure have an effect on reciprocating compressors?

At very low suction pressure, the suction valves of reciprocating compressor will not work and there will be no gas in the cylinder during compression stroke, resulting some damage to the suction valves. If low suction pressure trip protection is not provided there can be some abnormal damage.

When centralised ac system used?

For big buildings like hospitals, hotels, airports, industrial buildings, and residential apartments the centralised air conditioning system is used.

What is a triple duty valve and what are its advantages and disadvantages?

Triple duty valves combine the features of a check valve, a throttling valve, and a shut-off valve, and are designed for installation on the discharge side of centrifugal pumps. The convertible body design allows the triple duty valve to be changed on-site from a straight configuration to an elbow configuration.

They prevent the end user from having to purchase many different types of valves separately, this saves money in materials and uses limited floor spacing.

A solar-heated steam-electric generating plant heats steam to 250 C After passing through the turbine cooling towers cool the steam to 30 C?

The steam at 250Degc does it work and gets converted to mechanical energy by the turbine and to increase the efiiciency of the turbine the pressure is mentained below atmosphearic pressure at the exhust. It is not cost benificaial to handle (pump) this steam coming out of the exhust thus needs to be cooled to take it to liquide stage by cooling towers.

What is Length of engagement in screw threads?

As I recall , 3 full threads is minimum engagement length

About Mechanical engineering drawing standard BS 3939?

state the legal time requirements for the retention of planned maintenance document

What is the difference between shear stress and bearing stress?

Sear stress are forces applied in opposition, producing a shearing or tearing force. Bearing stress is a load placed in one direction, such as the weight of a building bearing on the foundation.

How do you install AutoCAD?

1.Buy a autodesk.autoCAD2007 software.

2.Go to setup of that folder and install autoCAD.

3 Give the correct answer of asked questions.

4.Open it from desktop icon.

What is kaizen umbrella?

I've never heard of the term. But kaizen is a Japanese philosphy/person focusing on continuous improvement. So a kaizen umbrella might be an "umbrella" or group of different philosphys pertaining to improvements.

Duties and responsibilities of HVAC engineer?

ü Air Conditioning Cooling Load calculations, Heat Loss calculations following ASHRAE codes.

ü Duct system design, supervision, duct fabrication and installation of the ductwork following SMACNA 2, DW 144 codes.

ü Site supervision of all Air-conditioning works.

ü Selection of Chillers, AHU'S, FCU'S, Exhaust Fan, Blower and other Accessories.

ü Preparation of drawings for A/C equipments and accessories installation.

ü Ensure smooth commissioning of the erected HVAC projects.

ü Ensure that all HVAC site activities are conducted under controlled conditions as per shop drawings, method statements, and specification and work plan.

ü Ensure safe work environments, control the use of material and avoid damages and waste, request material, tools and equipment needed for the projects and issue the foreman daily instructions as per the work plan

ü Maintaining records and archives to company standards

ü Responsible for Preparation of Bill of Quantity of Materials for Projects

from

fayaz mohammed

HVAC Engineer