Question:

high temperature corrosion of a carbon stee; can be a problem at a temperature above

A.

500 oc

B.

1000 oc

C.

1500 oc

D.

none of the above

Answer» a. 500 oc

Question:

one of the following is a preventive measure to control corrosion fatigue failure

A.

eliminate cyclic stresses

B.

reduces stress concentratio n

C.

obtain a smooth and shiny surface on the metal

D.

all of the above

Answer» d. all of the above

Question:

for materials having high ductility,                      type of bend test is used

A.

close

B.

angle

C.

1800

D.

cold

Answer» c. 1800

Question:

which of the following is a type of surface defect ?

A.

dislocation

B.

low angle grain boundary

C.

schottky

D.

both b and c

Answer» b. low angle grain boundary

Question:

The displacement distance for atoms around the dislocation is the

A.

edge dislocation

B.

screw dislocations

C.

burger vector

D.

none of the above

Answer» c. burger vector

Question:

which of the following defect is not surface defect ?

A.

dislocation

B.

low angle grain boundary

C.

schottky

D.

both b and c

Answer» d. both b and c

Question:

                       dislocations can glide & climb

A.

screw

B.

edge

C.

twinning

D.

cross

Answer» b. edge

Question:

in beam cross-sections,the axis along which the bending stresses are zero, is called as                      axis

A.

bending

B.

parallel

C.

perpendicular

D.

neutral

Answer» d. neutral