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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
Is it ok to run gas flex hose in a wall instead of black iron pipe?
NOOOOOOOOOOOOOOOOOOOOOOOOOO
Answer No is the short answer (and safest) but it can actually be done. There is a book available to answer this and other questions about propane/natural gas. The National Fire Proctection Association produces books on a variety of fuel related topics and the one that refers directly to propane and natural gas is #58. This also is the MINIMUM codes that any propane appliance must adhere to....states, counties and cities can have stricter codes, but these ones MUST be followed at the very least. Most areas just use the NFPA as their standard.
What do you mean by quenching of steel?
quenching is rapid cooling of steel to be heat treated, there are basically four types of quenching:
1- by water.
2- by oil.
3- by air.
4- by furnace.
water oil air furnace
tensile stress 175*104 112*104 88*104 52*104
(N/mm2)
Whether HAZ is higher in gas welding or arc welding?
Larger in Gas Welding. In all arc processes the HAZ is concentrated in a couple inches around your bead. In gas welding it can be double or triple that size.
Simple experiment to compare steel and cast iron?
A steel specimen would give a longer or continuous sound when beaten by a hammer. This is due to the malleable nature of the material. In other words, sound takes longer to travel in a coarse-grained material.
Whereas cast iron specimen gives sound of shorter duration. This is due to the brittle nature of the material. In other words, sound takes shorter to travel in a fine-grained material.
What is the relationship between fluid head and pressure in a closed loop system?
Head = (Pressure * specific gravity)/2.31
Head in ft
Pressure in pound per in^2
Why adolescence is called a period of stress and strain?
There are jerking hormones in this age. On one hand you are treated like you are young. On the other hand you are expected to behave like grown up man.
How do you relight the pilot light?
If you have an automatic lighter connected to the thermostat follow these directions:
- Turn the on/off/pilot valve to 'pilot'
- Hold the button on top of the controls down completely. This is the thermocoupler button.
- While keeping the thermocoupler button pressed down push the automatic lighter button until the pilot light lites. You can see it lit through the viewing glass.
- Keep holding the thermocoupler button down for a minute after the pilot light is lit.
- If it does not stay lit then your thermocoupler is probably bad and needs to be replaced
What is the temperature of dry saturated steam at 510psig?
It will vary slightly with changes in atmospheric pressure, but is approximately 472ºF.
Where does a 2 stroke engine cylinder lubrication go once used?
Oil used in a 2 stroke motor is specially engineered to provide lubrication and to burn. The oil is burned in the combustion chamber.
Why don't they make the entire plane out of black box material?
The material that the black box is made of is too heavy. A whole plane made of the same material (All stainless steel), it would have a hard time getting off the ground and would be ridiculously expensive.
What is the difference between foam glass and fiber glass?
Foam glass is made when air bubbles are put into the glass when it is melted .
Fiber glass is glass that has been pulled into long strands.
they are long neck gradual reduction type reducer used for smal diameter piping.
When pressure testing water gate valves do you test with the gate in the closed position?
If the gate valve or any valve for that matter is closed the test to the valve will tell if the piping has integrity but the piping AFTER the closed valve will not be subject to the test
a hex bolt is bolt having six face head operated by spanner.
an allen bolt is bolt having a six face groove in the head and operated by a special type of L shape key called allen key.
What is the 3 basic types of surface development?
There are three major kinds of surface development
1. parallel line development
2. radial line development
3. triangulation development
By: Ossan abad
Which is a better car - the one with the engine in front or rear?
A car with the engine in the rear should have rear/all wheel drive.
A car with the engine in the front should have front/all wheel drive.
Which are the necessary books for gate mechanical engineering?
There is no such book for GATE exam. All you have to do is to read the standard author books for each subject mentioned in the syllabus. Refer at least two books per subject, let one of them explains the concept in detail (possibly foreign author books), the other should contain, maximum no of problems. Solve the previous year Gate question papers. Work out as many problems as you can. This year general aptitude questions are also going to be asked in the exam. So you ve to prepare for that too. I prefer RS Aggarwal book for General Apti. I have also mentioned few of the books that i know.
Strength of materials- Beer johnston and Rk bansal.
Engineering Mechanics- Beer&johnston, RK rajput
Fluid mechanics- RK Bansal
Thermodyanmics- Cengel.
Applied Thermodynamics- PK Nag or Domkundwar.
Power plant Engineering- PK Nag.
Design of M/c- Shigley, VB Bhandari.
Theory of machines- Norton, Rattan SS
Materials Science- Callister, OP Khanna.
Manufacturing -Refer HMT book and Hajra Choudary.
Heat Transfer- Cengel. Sachdheva.
For any further queries contact me at mech.bharathi@gmail.com
The measure of angle abc equals 30 degrees what is the measure of arc ac?
pi x 6 x radius (ab or bc). Circumference is 2pir, 30 degree arc is 1/12 of circumference. In radian measure 30/57.3 ie 0.52 radians.
How do you control hot shortness?
The main reason of hot sortness is sulphur in steel. Therefore, answer of control of hot sortness is to control the sulphur in liquid steel before casting
What is the most expensive element?
Plutonium:
Cost: About $5000 per 100 grams bulk
and about $13000 per 100 grams pure.
Synthesis: Man-made in nuclear reactors
Charactersitics: Highly Radioactive
Half-Life: 87.74 year platinum
When a pipe has an outside of diameter 42mm and a bore of 26mm find its cross-sectional area?
The cross-sectional area of a tube is equal to the area of the outer circle minus the area of the bore, so using the formula for area of a circle, we can do the following.
A = pi*(42/2)2-pi*(26/2)2 = 272 pi, A = 854.513 mm2
