Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
A riser or a feeder head is a passage of sand made in the cope to permit the molten metal to rise above the highest point in the casting after the mould cavity is filled up. Risers serve a dual function. They compensate for solidification shrinkage which is a very common casting defect and are a heaf source so that they freeze last and promote directional solidification.
Types of Risers : There are two types risers :Top or open risers and side or blind risers.
Riser shape and Size : The metal in the riser should remain in the molten state for a longer time than in the mould cavity.
It means a heaf looses in riser should therefore be kept to a minimum. It means a riser most freeze more slowly than the casting. Those there shape should be such as to give volume-to-surface-area ratio a maximum value. This ratio is maximum for a sphere. Therefore this is the ideal shape of a riser.
As regards the height of the riser, it must be fall enough to ensure that any pipe formed in it does not penetrate the casting.
NOR Gate: Figure shows a further example of a 2 input digital gate, again consisting of two NPN transistors, TR1 and TR2, in a different configuration. When input A and input
Light-emitting diode: One of the most common light sources used in electronics is the "Light Emitting Diode" (LED). A LED is a two terminal semiconductor device comprising a p
Method of calculating the thrust forces: The thrust forces or gas loads can be calculated for the engine, or for any flow section of the engine, provided that the areas, pressu
Wing design for a sports glider The justification of the aerofoil selection with appropriate data, based on tunnel work or computational analysis. Sizing of the wing in
Impulse-Train Sampling
dc and ac analysis
how can i operate cisco switches without packet tracer?
A 10m diameter circular tunnel is to be excavated in a jointed ground. The joint sets spaced at 6m are dipping towards the West at 50°. A horizontal circular tunnel is to be cons
Convert the following reduced bearings to whole circle bearings: N.36°16’E; (b) S.28° 14’ E. (c) S.47°26’W and (d) N.58°24’W
what is the input to a process control system?
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd