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Q. How can we use of Shrinkage allowance?
Since metal shrinks on solidification and contracts further on cooling to room temperature, linear dimensions of the pattern is increased in respect of those of the finishing casting to be obtained. This is called "shrinkage allowance". It is given as mm/ m.
Typical values of shrinkage allowance for various metals re given below:
C.I. Malleable iron = 10mm/m
Brass, Cu, Al = 15mm/m
Steel = 20mm/m Zinc,
Lead = 25mm/m
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Strength tests : These tests are carried out to check the holding powers of various binders used in green moulding sand, dry moulding sand and core sand. These tests are performed
Q. Environmental factors for high temperature service materials? Many environmental factors must also be considered when choosing a material for high temperature service. High
Evaluate the speed of train: A train of mass 200KN has frictional resistance of 5N per KN. Speed of train, at the top of an inclined of 1 in 80 is 45 Km/hr. Find speed of tra
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what is the least count of following instrument? vernier caliper micrometer bevel protractor dial
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