Match the examination/inspection technique(s) in the following cases:

P. Internal crack developed in a component due to faulty metal flow conditions during its forging.	1. X-ray diffraction
Q. Segregation in steel casting.	2. Dye penetrant test
R. Hydride formation in a Tia Boy component due to its exposure to H2 at high temperature.	3. Sulphur printing
S. Surface cracks formed on a car body during its manufacture.	4. Radiography

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