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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

How do you do a motor and gear box alignment using two dial gauge?

Crankshaft flywheel flange runout.

The crankshaft flywheel flange must be perpendicular to the axis of rotation of the crank with no permissible runout. Place a dial gauge on the bell housing and position the tip against the flywheel flange, parallel to the crank axis. (Perpendicular to the flange surface). Zero the gauge. Rotate the crank slowly by hand and watch for any movement. Any runout must be eliminated (because it will be compounded by the radius of the flywheel.)

Flywheel friction face and rim face runout.

With the flywheel now mounted to the crank, Place a dial gauge (magnetic clamp or mechanical clamp) to the bell housing and point the dial gauge perpendicular to the clutch friction face on the flywheel. Slowly rotate the crank and check for variation (runout). Maximum permissible runout is 0.01mm per 10mm of flywheel radius. Thus for a typical 300mm dia flywheel, max runout is 0.15mm (0.006"). (Runout here could cause rapid wear of the clutch splines or the driven plate breaking away from the splined hub due to continual flexing.)

Reposition the dial gauge to point at a smooth piece of the flywheel near the starter gear teeth (rim), once again parallel to the direction of the crank. Slowly rotate the crank and note any runout or warp in the flywheel. The same maximum permissible runout applies here.

Bellhousing (gearbox) runout

Repeat the exercise with the dial gauge clamped to the flywheel/clutch assembly pointing out (radially) to the bell housing locating the dial gauge point on the machined face of the bell housing that locates the gearbox. (At right angles to crank direction). Check for radial run out. Maximum permissible runout is 0.20mm or 0.008".

How can pulleys be used to increase the speed of a motor?

I dont think you can increase the speed of the motor but if the motor is driving some piece of rotating equipment (pump etc) the speed of the driven shaft can be increased up to the point where the motor reaches full load current.

What is the feed rate for cutting double lead threads?

Your feed rate depends on the pitch of the thread i.e. 16 TPI =a feed rate of .0625

To cut a double lead thread you need to either rotate the part 180 deg. for the

second thread or change the start point by pitch /2

1/16=.0625 .0625/2= .0312 so your second thread will start .0312 from the first thread.

What is the main advantage of a flitch beam?

the main advantage of flitch beam is to strengthen the beam and decrease the deflection (∆) in the beam by decreasing elasticity (E) because the elasticity of steel is much bigger than a wood beam. their ratio is about 15 to 20 (n=15 to 20).

What is the tinsel strength of steel?

You mean tensile strength. Different steels have different tensile strengths. The way they are made (drawn, cast, forged, etc.) is critically important to the tensile strength. By the way--steel is more important for its stiffness than its tensile strength.

What are the reasons for crankcase explosion?

high temperature due to the reciprocating movement of the piston,

increase in bearing temperatures,

sparks entering the crankcase due to leaky piston rings or piston blow past,

fires in the adjacent scavenge trunks.

Now, when these hot spots come in contact with the oil in the crankcase, the oil gets vaporised. When these vaporised particles travel to the cooler part of the crankcase they get condensed into a white mist which has oil particles properly dispensed in it. The process that takes place is some what similar to atomization. This white mist when again travels to the hot spot area, can easily catch fire, which might also lead to an explosion. The fire or the explosion create immense pressure inside the crankcase and if this pressure crosses the permissible limit, crankcase explosion takes place. The explosion will rupture the crankcase doors and even cause heavy damage to the inside of the engine.

What is valve actuating mechanism?

Mechanism with side camshaft

and

Mechanism with overhead camshaft

both valve actuating mechanisms are used to operate inlet or exhaust valves.

How do you sweat brass pipe fitting?

First, clean the inside of the fitting to be soldered, and the outside of the tube it is to be soldered to, with abrasive cloth, steel brushes, steel wool or equivilent. Second, apply a thin coating of soldering flux to these surfaces. Install the fitting on the piece of tubing and turn to be assured of a coating of flux is spread evenly between these surfaces. Using a torch apply heat to the base of the cup of the fitting. Using a circular motion apply heat evenly all around the fitting (at its base). When flux begins to show signs of bubbling apply appropriate wire solder at top of fitting cup. If joint is sufficiently heated solder will become liquidious and run into the joint. Apply only enough heat to melt soldering compound being used. When solder becomes liquidious remove heat from joint. Allow joint to cool and solder to return to solidus state. Overheating will cause flux to burn inside joint. The carbon formed will prevent solder from filling that area. If several of these "areas" join together, not only will the joint be weak but it will also leak!

What is design standardisation?

It is the process of creating products which are the same but can be used in different ways. This is closely linked to 'modular design' which is more focused on designing singular component parts which can be used in a multitude of different products. basically.. being able to use the same components or products for different projects.

Find the heating surface of a water tube boiler tube with a 3 diameter and 20 feet long?

3.14*3*20*12= 2260.8 sq inthe heating surface of a fire tube boiler is determined by adding all of the surface of the tubes that have hot water on one side and/or fire or gases of combustion on the other, including the super heater and economizer.

How do you calculate gpm from TR?

The GPM is gallons per minute and TR is the ton of refrigeration. The GMP can be calculated from the TR by using the formula BTUH divided by 500 multiplied by Delta T.

Anna university sample question paper for first semester 2008-2009 pdf file?

Anna University sample Question Papers for first Semester 2008-2009 PDF file download visit the website: campusexpress.

What is spark ignition or Diesel?

spark ignition engine is also known as petrol engine. but in diesel engines the fuel is burnt due to the high compression of air.so there is no need of spark plug

What is the cylinder size for 500mm bag size in flexografic printing machine?

If your bag length is 500mm long, the circumference of your drum including your printing plate shall be 500mm. Hence find the diameter of the drum and the plate, then deduct twice the plate thickness (say if the plat is 4 mm, it comes on both sides, so deduct 8mm from the diameter) and derive the circumference of the drum from this number.

What are the cut off lengths or dimensions on 15mm and 22mm low carbon steel pipe?

In the USA, 15mm is half-inch, and 22mm is three-quarters inch. Lengths of pipe nipples in these sizes range from one and a quarter/one and a half, to six inches, in half-inch increments.

What is modulus rigidity of nylon?

It will depend on the Nylon type; average is about 200,000 psi (1380 MPa)

Why are lasers used for welding?

They're a nice way of delivering an intensely focused heat.