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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

What is a Monoblock pumps?

A Monobloc pump is a pump in which all rotating parts are mounted on a common shaft. The main components of a Monobloc pumps are Pump assembly and Motor assembly.

Since there are 7% losses in belt driven sets and 3% losses in coupling driven sets hence to avoid these transmission losses Monobloc pump sets evolved. In monobloc pump sets as motor and pump are mounted on a single shaft there is no energy loss during energy transmission from motor to shaft.­­­­­­­­

By - Tanveer Ahmed Bankapur

Block diagram for Bourdon pressure gauge?

------------>[bourdon tube]--------->[level & gear]---------->[pointer,scales]------->

pressure small amplified pressure

displacement displacement

How does a handgun work?

There are several different types of handguns.

Single-Shot Pistol - pre-1840's design. Single ShotEarly guns were single-shot pistols that were loaded from the muzzle end. Black powder was poured into the barrel and the bullet forced on top of the powder. A Flintlock pistol was fired using a hammer that held a flint rock that fell against a Frizzen that created sparks. The hammer would force the frizzen away to expose the powder to the sparks. Revolver PistolThe Revolver was designed to allow the user to load 6 shots or more. The gun operates by rotating the cylinder containing the loaded rounds in individual Chambers. By pulling back the hammer (i.e. cocking the gun), the hammer moves a ratchet that rotates the Cylinder to a unfired chamber. This mechanism was copied from the windless of a ship. The gun is fired by pulling the trigger, thus releasing the hammer, allowing it to fall on the chamber to fire the bullet. Automatic PistolVery complicated mechanism. The gun has a slide mechanism that is pulled back and picks up a new bullet from the magazine in the grip of the gun. When the slide returned, it would cock the gun so that it would fire when the trigger is pulled.

HOW to calculate shear stress in a coupling?

I suggest you refer to an engineering text-book because there are so many variables in the calculation your question as put is not answerable.

What are the differences between normal chillers and high tension chillers?

"High tension" means the same thing as "high voltage." These chillers have greater capacity and are typically used in industrial and some scientific applications. Normal chillers are more widespread, appearing in air conditioners, refrigerators, and various other appliances.

Difference between rankine and brayton cycle?

Brayton cycle: It is open cycle.

Rankine cycle: It's close cycle.

Brayton cycle: Mostly used in gas turbine engine.

Rankine cycle: Mostly used in power generation plant.

Brayton cycle: Resemble less to Carnot cycle.

Rankine cycle: Resemble is more to Carnot cycle.

Heat exchangers can be found in what systems?

furnance

Applications of finned tube heat exchangers embody Steam air heater / steam radiator, energy fluid air heater / energy fluid radiator, predicament air heater / predicament radiator, Air heater for spray dryers, Air heater for fluid bed dryer, Air heater for flash dryers and Air heater for dryers. These area unit factory-made exploitation high grade steel, stainless-steel, copper, brass and metal. Our Finned Tube Heat exchangers area unit designed to satisfy the particular temperature, heavy duty condition and pressure of the fluids.

Fin tubes,tubos aletados, acero inoxidable, Stainless Steel 304, Aluminum,Finned tube,Brass tube, Valve & Pipe Fitting Supplier at http://www.ts-aceroinoxidable.com

What do happen when petrol is filled in the diesel engine?

Running gasoline in a diesel will do serious damage to the engine. You must remove all the gasoline from the tanks, & fuel lines. Purge all gasoline. If you have not starter the engine just drain the tanks.

What is soft soldering?

Soft soldering is using a heat to fuse metals together. In home improvements this is a useful skill to have when dealing with pipes and wiring.

What is turn key project?

Everything is done by General Contractor and client have to pay only payment periodically. Client is not affected by market rise. Owner put minimum efforts for his project so he has less stress.

What happens if you look at the light while arc welding?

U can't sleep at night it feels like rock sand In ur eyes worst night of ur life call Anauri and ask him omfg........ Actually this is the best case scenario. Worst case would be permanent blindness. Basically the bright light burns the eye much like a sunburn. A mild case causes what's called a "flash". This is a slight burn to the surface of the eye. Severe cases can cause temporary or even permanent blindness. This can also happen if you do not use a dark enough lens.

Do ships use diesel or petrol?

"Petrol from the ships" Is a famous phrase by Mina Ruhini, which firmly answers your question - Ships run on petrol.

What is the Function of gland box in steam turbine?

Gland is used for the prevent leakage of oil from the gland box which is made up of copper or brass and gland box function is to support the glands which are made up of cast iron.This is called oil gland.

steam gland is used for prevent the leakage of steam which exhausts air and which helps build up the vaccum in condenser is called steam gland.

Is stainless steel grade 304 and 8.8 is different?

I assume you mean 18-8.

18-8 steel is stainless steel with about 18% chromium amnd 8% nickel. 304 is in that category and is indeed an 18-8 steel. There are other 18-8 steels, such as 301 and 302, so while all 304 steels are 18-8 not all 18-8 steels are 304

What are the types of starting a gas turbine?

Many business jets, regional commercial aircraft, helicopters, etc. generally thought of as "smaller" aircraft typically utilize a battery and electric start motor similar in concept to the way a car is started. The sequence typically is:

1) Ignitors (e.g. spark plugs) are turned on

2) The electric starter (which is mounted on a gearbox) is turned on

3) Rotational power is transmitted through the gearbox to a tower shaft

4) The tower shaft is connected to a bevel gear on the engine shaft. In a multi-shaft engine the bevel gear rotates the high speed rotating group or high spool.

5) When the high spool reaches 15 to 20% of maximum speed, fuel is scheduled to the combustor.

6) The fuel ignites and begins to add rotational power to the high spool as the hot gases expand through the turbine.

7) As speed increases, the torque supplied by the start system decreases and the torque supplies by the fuel via the turbine increases.

8) The starter generally cuts out when the high spool reaches 50% of maximum rotational speed and the turbine continues to accelerate the rotor until idle speed is reached, concluding the start sequence.

9) Compression system bleeds are open initially and generally stay open throughout the start sequence.

10) High compressor vanes are generally on their closed stop initially and can begin to open as the engine proceeds to idle speed.

The process is similar for larger engines with the battery being replaced by a small gas turbine engine (called and APU or auxiliary power unit) and the electric start motor being replaced by an air turbine starter. They perform the same function as in the above process utilizing pneumatic instead of electric power.

There are other methods of supplying starting power for military engines such as hydraulic (instead of pneumatic) powered systems, explosive cartridge starters, and the very uncommon impulse or impingement of air on turbine blades.

Air can also be cross bleed from other engines when one main engine is already running to power the pneumatic start systems.

In-flight when an engine needs to be restarted and the high spool can reach 15 to 20% rotational speed from inlet air (RAM air), there is no need to employ the starter. There is a defined envelope as to when this process can be used. Cross bleeding is another option of in-flight restarts.

What is cast iron FGS 400-15?

it is old denomination for spheroid cast iron, see below for actual denominations:

  • EN-GJS-400-15 (EN/NF)
  • 0.7040 (DIN)
  • 1083/400-12 (ISO)

FGS 400-15 is Franch ductile iron grade. It is equal to Germany grade EN-GJS-400-15. As for the detail properties and requirements to this material, please refer to the following link "EN-GJS-400 Ductile Iron". Dandong Foundry has elaberated the chemical and physical properties, advantages and problems for this material in this article.

What is inversion of mechanism?

Inversion of a kinematic linkage or mechanism is observing the motion of the members of the mechanism with fixing different links as reference frame. Each time when a different link is chose as the frame link the mechanism shows different characteristics of the motion.

What is servo motor What are its applications in modern technology?

A servo mechanism is one where there is a control system, and actuator; and where there is feedback from the actuator to provide agreement with the control signal.

The cruise control on your car is a servo system, for it senses the actuator's effect (road speed) and sends back a signal to the accelerator to adjust the car speed to the set target.

Early servo mechanisms (but not the earliest) used an electrical motor, which was also able to send back information on its position. This feedback is the essential part of a servo mechanism.

Probably the origin of the word is allied to "servant".

Can any one of you please suggest which materials are to be prepared for basic mechanical engineering?

First you have talent.

Mathematics. Physics. Materials science. Static. Strength of Materials. Technical drawing.

How do you calculate allowable leakage for HDPE pipes uring pressure hyodro pressure testing?

0.2 x(dia of pipe)x(length of pipe)

For examble if you have 100mm diameter pipe and 50 m length ..

0.2x0.1x50= 1 litre and this is your allowable value