Related Questions

A casting defect which results in general enlargement of a casting is known as
A Shift
B Sand wash
C Swell
D Scab
A casting defect which occurs due to improper venting of sand is known as
A Cold shuts
B Blow holes
C Shift
D Swell
Leaching of coarse solid lumps is also termed as
A Decoction
B Dissolution
C Percolation
D Agitation and settling
Misrun is a casting defect which occurs due to
A Very high pouring temperature of the metal
B Insufficient fluidity of the molten metal
C Absorption of gases by the liquid metal
D Improper alignment of the mould flasks
The endurance limit of a material with finished surface in comparison to rough surface is
A More
B Less
C Same
D More or less depending on quantum of load
Two streams of liquid metal which are not hot enough to fuse properly result into a casting defect known as
A Cold shut
B Swell
C Sand wash
D Scab
Sand wash is a casting defect which
A Results in a mismatching of the top and bottom parts of a casting
B Results in general enlargement of the casting
C Occurs near the ingates as rough lumps on the surface of a casting
D Occurs as sand patches on the upper surface of a casting
Shift is a casting defect which
A Results in a mismatching of the top and bottom parts of a casting
B Results in general enlargement of a casting
C Occurs near the ingates as rough lumps on the surface of a casting
D Occurs as sand patches on the upper surface of a casting
In a casting, cold shut defect is caused by
A Low pounhg temperature
B Melt-mould reactions
C Faulty gating system
D Very low mould permeability
Rayleigh's criteria for a rough surface is: (where letters carry their usual meanings).
A $${\text{h}} > \frac{\lambda }{\Delta }\cos \theta $$
B $${\text{h}} = \frac{\lambda }{8}\cos \theta $$
C $${\text{h}} > \frac{\lambda }{8}\cos \theta $$
D $${\text{h}}

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