The indentor used in the vicker's harness test is
A. 10mm dia steel ball
B. 120° diamond cone with a slightly rounded point
C. 3.2 mm dia steel ball
D. square base diamond pyramid (included angle 136° between opposite faces)
Answer: Option D
This Question Belongs to Metallurgical Engineering >> Metallurgical Testing And Inspection
Fatigue life is expected to increase by
A. increasing the size of the sample
B. smooth polishing of the surface of the sample
C. having compressive residual stresses at the surface
D. having tensile residual stresses at the surface
Which of the following is a function of a developer
A. Providing a contrasting background for visible dye indications
B. Making the penetrant water washable
C. Penetrating into discontinuities open to the surface
D. Dissolve organic soils on the test piece surface
With an increase in temperature, hardness of material . . . . . . . . and ductility . . . . . . . .
A. Increases, increases
B. Increases, decreases
C. Decreases, increases
D. Decreases, decreases
A brale indentor used in Rockwell hardness test has the following geometry and material.
A. Square based diamond pyramid with 136° included angle
B. Conical shape steel with 120° apex angle
C. Conical shaped diamond with 120° apex angle
D. 10 mm diameter hardened steel ball
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