The residual stresses in casting occur due to
A.sand particles being taken into molten metal while pouring
B.the insufficient gate size
C.the differential solidification rate of thin and thick sections of casting
D.none of the above
Category: Engineeeing Mcqs
Pattern draft for internal surfaces is
A.Less than that for external surfaces
B.More than that for external surfaces
C.Equal to that for external surfaces
In a thermal power plant, cooling towers are used to cool
A.steam
B.condensed wate
C.circulating
D.All of the above
To separate a binary mixture the relative volatility should be
A.equal to one
B.less than one
C.greater than one
D.greater than zero
The important factor to be considered while selecting a bearing is
A.Applied load
B.Operating speed range
C.Required bearing capacity
D.All of the above
E.None of the above
Which variety of steel may be expected to have lowest value of thermal conductivity?
A.High carbon steel (0.83% C)
B.Low nickel steel (1.37% Ni)
C.Low chromium steel (0.46% Cr)
D.High chromium steel (0.26% Cr)
E.Chromium nickel steel (9% Ni, 18% Cr)
In centrifugal compressors, the ratio of outlet whirl velocity to blade velocity at outlet is known as
A.Slip factor
B.Gauge factor
C.Feedback factor
D.Velocity factor
E.Reheat factor
Highly polished surfaces of a thermosflask prevent heat by
A.Conduction
B.Convection
C.Radiation
When calcium carbide is heated with nitrogen the product obtained is
A.Ca3N2
B.Ca(CN)2
C.CaCN2
D.Ca(CNO)2
Which one of the following is a safety device on a compressor?
A.Relief valve
B.Strainer
C.Over pressure shut down
D.Over speed shut down
E.Intercooler relief valve
