MECHANICALFUNDA for Mechanical Engineers

Difference Between Active and Passive Solar Heating

Solar energy is nonpolluting and renewable. There are different kinds of technologies that can harness solar radiation and convert it into solar energy. the building can employ either active or passive solar heating. So here this article gives the difference between active and passive solar heating to better understand this topic.

What is Active solar heating?

Using active solar heating air, water or creating electricity with photovoltaic panels. The panels should sit on your roof or on a sunny wall where they can collect heat and generate electricity to run a heat pump or power the blower fan of a gas furnace.

What is Passive Solar Heating?

Passive heating is to use materials with a high thermal mass. While the sunshine can warm the air in your home, the air itself has a low thermal mass. Some materials that can better capture heat include masonry products like ceramic tiles, stone brick, and concrete.

Difference between Active and passive solar heating:

Passive solar heating is a system that operates without pumps, blowers, or other mechanical devices, while active heating pumps, blowers, or other mechanical devices require circulating the working fluid for the transportation of heat.
Passive solar heating is a special building design that is necessary, while active solar heating is a special building design that is not necessary.
Passive solar heating is less expensive than an active system to construct and operate, while active solar heating is more expensive than the passive system to construct and operate.
Active solar heating can be employed at almost any location and type of building, while Passive solar heating is suitable where there is ample winter sunshine and an unobstructed southern exposure is possible.
Passive solar heating is a system of solar radiation is collected by an element of the structure itself. The various elements of the building like walls, roof, windows, partitions etc are selected and so architecturally integrated that they participate in the collection, storage, and transportation, and distribution of thermal energy, while Active solar heating is the solar radiation is collected using some kind of separate collectors. Solar energy may be stored in sensible heat storage materials or in latent heat storage materials and the energy is redistributed in the building space using pumps, fans, blowers, etc

Difference Between Straight Bevel Gear and Spiral Bevel Gear

Gear drive is one of the parts and parcels of a mechanical power transmission system that transmits power and motion by successive engagement and disengagement of teeth driver and driven gear. so here this article gives the difference between straight bevel gear and spiral bevel gear to better understand this topic.

Difference between straight bevel gear and spiral bevel gear:

A straight bevel gear is a teeth of this type of gear are straight and are cut along the axis on a cone, while the spiral bevel gear is the teeth are spiral and are cut in the form of the spiral curve on the pitch cone.
Straight bevel gear sudden contact also causes noise, while the spiral bevel gear operation is quiet.
The straight bevel gear has two teeth of the mating gears come in sudden contact. The contact is always a line of length equal to the face width of teeth, while the spiral bevel gear has teeth of two mating gears gradually come in contact. Engagement starts with a point and gradually becomes a line.
In straight bevel gear, shock loading induces a vibration and thus its operation is not smooth, but the spiral bevel gear gradually building up of load, It produces fewer vibrations and thus the operation is smooth.
In the straight bevel gear, due to sudden contact, teeth are also subjected to impact or shock loading, while in the spiral bevel gear the teeth are subjected to gradual loading.
A straight bevel gear is exerted less thrust force on the bearing that holds the shafts, while the spiral bevel gear is exerted more thrust force on bearings.
A straight bevel gear is designing and manufacturing of straight teeth bevel gear easier and thus these are cheaper, while the spiral bevel gear, are complicated design and manufacturing leads to higher cost for this type of gear.
The life of the straight bevel gear is shorter as it subjected to impact loading and vibrations, while the spiral bevel gear has a longer life.

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Difference between diathermic and adiabatic process

The diathermic ad adiabatic process is generally used in thermodynamics for explaining the surrounding. Therefore here this article gives the main key difference between the diathermic ad adiabatic processes to better understand this topic.

The adiathermic process is one In which heat can go in or out of the system. The adiabatic system is one in which heat cannot go in or out of the system

Difference between diathermic and adiabatic process:

Diathermic substances are those substances that allow heat to pass through them and the process is called a diathermic process. Adiabatic substances are those substances that do not allow heat to pass through them ad the process is called an adiabatic process.
Any, good conductor of heat is an example of a diathermic substance. For example, copper, silver ad steel, etc. While in the adiabatic process any insulator, glass, wool, asbestos, cork, etc.

Difference Between Cutting Speed and Cutting Velocity

Both cutting and speed velocity are interrelated and one is proportional to another. One can easily be converted to another, provided that the diameter of either cutter or workpiece is known. The following difference between cutting speed and cutting velocity to better understand this topic.

What is Cutting Speed?

Cutting speed is the rotational speed of either workpiece or there is some cutting tool. It is measured by the unit revolution per minute and designed by N. For example, cutting speed turning is 295rpm.

What is cutting Velocity?

Cutting Velocity is the tangential velocity of either the rotating workpiece or the rotating cutting tool. It is measured by the unit meter per minute and designed by velocity. Any rotating object or some part has a tangential velocity at any point on its body except the axis of rotation.

Difference between cutting speed and cutting velocity:

Cutting speed indicates the rotational speed of either workpiece or cutting tool, while the cutting velocity indicates the tangential velocity of either the rotating workpiece or rotating cutting tool.
Cutting speed is commonly expressed in revolution per minute, while the cutting velocity is commonly expressed in meters per minute.
Cutting speed is a scalar quantity, while the cutting velocity is one vector quantity.
Cutting speed is usually not considered as a machining process parameter, while the cutting velocity is considered as one crucial machining process parameter.
Cutting speed is only associated with that machining operation where either workpiece or cutting tool rotates, while the cutting velocity is associated with all conventional machining operations irrespective of presence or absence of rotation of workpiece or cutting tool.
Cutting speed is mainly useful when operating machines, while cutting velocity is useful in a number of analyses, including the measurement of cutting power, temperature, vibrations, and machining economy, among others.

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Difference Between Dry Machining and Wet Machining

Machining is one secondary manufacturing process that is performed to impart the desired shape, size, and surface finish by removing material from a solid 3D blank. Here this article gives the difference between machining and wet machining to better understand this topic.

Difference between dry machining and wet machining:

Dry machining is performed in absence of appropriate cutting fluid, while wet machining is performed in presence of appropriate cutting fluid.
Dry machining fluid delivery system is required, while the wet machining proper fluid delivery system must be installed with the machine tool for controlled delivery of cutting fluid.
In Dry machining due to excessive cutting heat, chip color changes undesirably, while the wet machining chip color usually remains the same as that of work materials.
While using dry machining workpieces and cutting tools are subjected to other thermal damages also, while the wet machining reduces the tendency of thermal damages of workpiece and cutter.
Dry machining can be carried out while cutting soft materials like wood, polymer, soft metals, Wet machining is preferred which cutting hard metals like steel, titanium, etc.
Dry machining cutting temperature remains very high during machining, whole the wet machining cutting the temperature remains significantly low because of reduced rate of heat generation ad continuous removal of heat by cutting fluid.
Dry machining is less hazardous to the worker. No such environmental pollution is associated with dry cutting, while the prolonged exposure to cutting fluid sometimes turns to the operator. It is disposal contaminates the environment.
Dry machining is a rate of heat generation machining is considerably more, while the wet machining for same parameters and materials, rate of heat generation is low due to lubricating effect of cutting fluid.
Dry machining is high cutting temperature accelerates the tool wear rate and this reduces tool of life. It also tends to deform the cutting edges plastically, while the wet machining for the same work tool material combination and process, a tool under wet machining exhibits prolonged life due to degraded wear rate.
Dry machining problem associated with corrosion of machine tools is not prevalent here owing to the absence of cutting fluid, while the wet machining of some cutting fluids corrodes various machine parts rapidly. Thus longevity of machine tools degrades.

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Advantages and disadvantages of self driving cars

Self-driving cars are going to make everything worse. Their perfect driving, as well as relentless, will decrease traffic fatalities by 90%. Self-driving cars will make our way to work stress is free. So here this article gives the advantages and disadvantages of a self-driving car to better understand this topic.

Advantages of self-driving cars:

Potential for more powerful vehicles.
The self-driving car is usually focused on electric vehicles rather than hybrid or gasoline cars. Using electric cars will decrease the emissions that are released into the atmosphere.
This will eliminate all accidents caused by humans, making roads a safer place.
Self-driving cars could be safe and it is a totally reliable mode of transportation. Those with a disability or the elderly would be able to get into the self-driving car without putting others at risk.
The self-driving car is their ability to communicate with each other. With this ability to communicate in real-time devices, cars would be able to safely travel efficiently at optimized distances from each other.

Disadvantages of self-driving cars:

If the car without a driver crash, who will be guilty? who should compensate for the damage?
Many trucks, as well as some taxi drivers and some other drivers, will become jobless, as autonomous vehicles take over.
Driverless cars would function using your place as user information by creating major privacy issues problems.
A self-driving car would probably cost more than $100,000. Many ordinary people cannot afford to buy such kinds of cars.
Self-driving vehicles are leading by computer devices. Even a minor computer malfunction, may crash than occurring because of human error.
The road system should be changed in order to be adjusted to new driverless vehicle systems.
Terrorists will use self-driving cars to load them with explosives and as moving bombs.
Since drivers become used not to driving their experience and their proficiency will maybe reduce. And if they will need to drive under certain conditions, there are certainly many problems that may arise.
The other disadvantage of the driverless car is the factor of hackers. Hackers may get into the car software and affect or control its operation and create some problems.
Heavy rain interferes with rood-mounted laser sensors. Its turn snow interferes with its cameras. There is really challenging for a robot to read for human road signs.

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ONGC full form

What is the full form of ONGC?

Answer:

Oil And Natural Gas Corporation

What does ONGC mean?

The ONGC is an Indian crude oil and gas multinational corporation and its head office located in New Delhi, India. The ONGC is a public sector project which is under the administrative control of the government of India's ministry of petroleum and natural gas. In the year of 1994, ONGC was reconfigured as a limited enterprise under the company act, 1956.

SFI full frorm

What is the full form of SFI?

Answer:

Sequential Fuel Injection

What does SFI mean?

SFI is a type of multipoint fuel injection system in which each injection valve will open just before the cylinder intake valve opens. The individual injections work by themselves because they are fired individually. Other multi-port systems will fire all the injectors in a group no matter if the cylinder is ready or not. But the SFI has many advantages, direct injection is quickly becoming the system of choice and it is replacing the SEFI systems.

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BCP full form

What is the full form of BCP?

Answer:

Boiler Circulating Pumps

What does BCP mean?

A boiler circulating pump (BCP) circulates water inside the boiler to boost boiler efficiency. The suction from a header connected to multiple downcomers at the bottom of the boiler drum, then discharges through additional tube circuits. This implies that the water being pumped is at the same temperature and pressure as a boiler.

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Full form of PFI

PRV valve full form

What is the full form of PRV?

Answer:

Pressure Reducing Valve

What does PRV mean?

Under such situations, a PRV valve may be used to defend against water hammer. Water hammer events are so quick that relieving pressure with this approach necessitates the use of very specific rapid response valves equipped for the specific systems. Where another form, such as an air vessel, is in use as the primary safety system, PRV may be used as an added precaution.

GDI full form

What is the full form of GDI?

Answer:

Gasoline Direct Injection

What does GDI mean?

GDI is a type of fuel injection that many modern vehicles use. Traditional multipoint fuel injection injects, at low pressure, fuel into the intake. With GDI engines, a typical fuel line injects gasoline directly into each cylinder's combustion chamber at high pressure.

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PFI full form

What is the full form of PFI?

Answer:

Port Fuel Injection

What does PFI mean?

PFI system is a long-ago replaced carburetors is a car because of their efficiency and lower maintenance requirement. Automakers are moving towards the even more efficient direct injection. With port fuel injection gasoline is sprayed into the intake manifold, where it mixed with air and then is sucked down into the cylinders.

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SOHC full form

What is the full form of SOHC?

Answer:

Single Overhead Camshaft

What does SOHC mean?

SOHC is a valvetrain configuration in which there is only one camshaft per cylinder header that operates both the intake and exhaust valves. DOHC means you have two separate camshafts one for intake valves and one for exhaust valves. SOHC engines only have 2 valves per cylinder one intake and exhaust.

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Full form of DOHC

DOHC full form

What is the full form of DOHC?

Answer:

Double Overhead Camshaft

What does DOHC mean?

The DOHC is an engine that has two camshafts situated in the cylinder head above the combustion chambers, one to operate the intake valves and the other to operate the exhaust valves. A dual overhead camshaft is also called a DOHC. Higher horsepower and improved performance are correlated with DOHC engines. These engines are made louder, smoother, and more powerful by this unique design.

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Difference Between Parallel Helical Gear and Crossed Helical Gear

Compared with the spur gear, helical gear works more smoothly and softly due to the way the teeth connect. The most widely used gear in transmissions is the Helical. They also produce a significant amount of thrust and help sustain the thrust load by using the bearing. There are two types of helical gear called helical gear parallel and helical gear crossed. So here this article gives the information about the difference between parallel helical gear and crossed helical gear to better understand this topic.

Difference between parallel helical gear and crossed helical gear:

Parallel helical gear can transmit motion and power between parallel shafts only, while crossed helical gear can transmit motion and power between perpendicular but not intersecting shafts.
In Parallel helical gear, two mating gears must be mounted on two parallel shafts, while the crossed helical gear two mating gears are mounted on two perpendicular but non-intersecting shafts.
The power transmission capacity of parallel helical gear is higher due to broader contact, while the crossed helical gear has lower power transmission capacity due to point contact.
Parallel helical gear has a wide area of application ranging from small equipment to large industrial fields including gear trains, while the crossed helical gear is rarely used in small size instruments.
parallel helical gear has two mating gear that should have the same helix angle contact but gradually becomes a line contact, while the crossed helical gear two mating gears may have different helix angles. They may have either the same or opposite hand of the helix.
parallel helical gear the engagement between two teeth starts with a point contact but gradually becomes a line contact, while the crossed helical gear two meshing teeth always have point contact.

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Difference between petrol and diesel oil

Petrol ad diesel is the most popular fuel. Petrol is more volatile, more flammable, light dense and lighter than diesel. So here this article gives the main key difference between petrol ad diesel oil to better understand this topic.

What is petrol oil?

Petrol is the most popular fuel, powering the majority of transportation needs throughout the world. Also known as gasoline, petrol is a hydro carbo derived from crude oil. When in its natural state, petrol is a liquid with a distinctly strong order.

What is diesel oil?

Diesel oil is any liquid fuel used in diesel engines, which use fuel ignition without a spark, Diesel oil is a widely used source of petroleum fuels throughout the world. It is common in boats, trains, uses fuel construction, military vehicles, cars, heating systems, and more.

Difference between petrol and diesel:

Petrol is more volatile, more flammable, light dense and lighter than diesel.
Diesel-powered cars run at lower speeds where petrol runs at a higher RPM and provide more torque.
Knocking-in a petrol engine is due to the sudden spontaneous combustion of petrol before sparking of the spark plug. While knocking in a diesel engine is due to delay in the combustion of diesel oil by compression.
At lower temperatures, diesel viscosity rises where petrol doesn't change at all.
Petrol has higher CO2 and carbon monoxide levels than diesel, but, like diesel, it does not contain suspended particulate matter.
Diesel provides more energy per gallon, resulting in diesel-powered cars having more miles per gallon than gasoline.
Belding agent used in petrol are cracked and reformed gasoline, benzol and alcohol to increase octane no of petrol, Belding agent is not used in diesel oil.
Doping agent in petrol is tetraethyl leed to reduce its knocking In petrol engine. doping agents used in diesel oil are ethyl nitrate, acetone peroxide to reduce its knocking in a diesel engine.

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Difference between LPG and CNG

Advantages and disadvantages of fossil fuels

Fossil fuels are energy resources formed over millions of years from the remains of dead plants and animals buried underneath sediment and rock.These dead plants and animal matter were transformed into fossil fuels by subsequent decomposition without the presence of oxygen, combined with naturally occurring heat underneath the earth and pressure from rock and soil. They are used throughout the world to power everything from cars to light in the home. So here this article gives the advantages and disadvantages of fossil fuels to better understand this topic

Advantages of fossil fuels:

Fossil fuels can generate a large amount of electricity at a single location.
They have become safer over time.
Despite being a finite resource, it is available in plenty.
They are cost-effective.
They can be found very easily.
Transportation of oil and gas can be done easily with the help of pipelines.

Disadvantages of fossil fuels:

Fossil fuels emit carbon when burnt which is a major greenhouse gas and the primary source of pollution.
They are non-renewable resources, once used they cannot be replaced.
The combustion of fossil fuels makes the environment more acidic. This has led to unpredictable and negative changes in the environment effect.
Fossil fuels are highly susceptible to price fluctuation and market manipulation.
Harvesting of fossil fuels also causes fatal diseases among people. The coal miners often suffer from black lung disease. The natural gas driller is constantly exposed to chemicals and silica which is dangerous for their health.

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Full form of EFI

What is the full form of EFI?

Answer:

Electronic Fuel Injection

What does EFI mean?

EFI is a system that is used both in gasoline and diesel engines. There are many problems with the carburetor used for preparing the charge in the gasoline engines. MPFI, GDI, EFI all these fuels refer to the newer generation petrol injection systems. So nowadays older engines used simple fuel injection which replaced to overcome some of its shortcomings. The carburetor being a mechanical instrument device was just not fully capable of controlling an accurate air-fuel ratio to meet the growing demands for better emission control.

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Full form of CFI

What is the full form of CFI?

Answer:

Continuous Fuel Injection System

What does CFI mean?

CFI provides a continuous spray of fuel to each injector at a point before the intake valve. Because the entrance of the fuel into the cylinder is controlled by the intake valve, the continuous system will fulfill the requirement of a gasoline engine. Its timed injection system thous a necessity for diesel engines, costs more than continuous systems. They are used on gasoline engines only when more precise fuel metering desired.

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Full form of MPFI

What is the full form of MPFI?

Answer:

Multi-Point Fuel Injection

What does MPFI mean?

The MPFI is a system of injecting fuel into the internal combustion of the engine through multi ports situated on the intake valve of each cylinder. It delivers an exact quantity of fuel in each cylinder at the exact right time. There are three types of MPFI device, batched, simultaneous and sequential.

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Full form of EFI

Pages

Difference between Active and passive solar heating:

Difference between straight bevel gear and spiral bevel gear:

Difference between diathermic and adiabatic process:

Difference between cutting speed and cutting velocity:

Difference between dry machining and wet machining:

Advantages of self-driving cars:

Disadvantages of self-driving cars:

What is the full form of ONGC?

What does ONGC mean?

What is the full form of SFI?

What does SFI mean?

What is the full form of BCP?

What does BCP mean?

What is the full form of PRV?

What does PRV mean?

What is the full form of GDI?

What does GDI mean?

What is the full form of PFI?

What does PFI mean?

What is the full form of SOHC?

What does SOHC mean?

Difference between parallel helical gear and crossed helical gear:

Advantages of fossil fuels:

Disadvantages of fossil fuels:

What is the full form of EFI?

What does EFI mean?

What is the full form of CFI?

What does CFI mean?

What is the full form of MPFI?

What does MPFI mean?

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