Machine Design

A. brittle when cold
B. brittle when hot
C. brittle under all conditions
D. ductile at high temperature
E. hard when hot

A. brittle
B. ductile
C. elastic
D. plastic
E. tough

A. Brinell
B. Rockwell
C. Vicker
D. Shore’s sceleroscope
E. none of the above

A. decreasing the cross-section area of’ bar
B. increasing the cross-section area of bar
C. remain unaffected with cross-section area
D. would depend upon other factors
E. none of the above

A. be independent of ratio of mass of load W to mass of bar (y)
B. increase with increase in y
C. decrease with decrease in y
D. depend on other considerations
E. none of the above

A. variation in properties of material from point to point in a member
B. pitting at’points or areas at which loads on a member are applied
C. abrupt change of section
D. all of the above
E. none of the above

A. increases the seriousness of static load-ing stress concentration
B. lessens the seriousness of static load¬ing stress concentration
C. has no effect on it
D. depends on other considerations
E. none of the above

A. electroplating
B. polishing
C. coating
D. shot peening
E. heat treating

A. ductile materials
B. brittle materials
C. equally serious in both cases
D. depends on other factors
E. unpredictable

A. cold working
B. shot peening
C. grinding and lapping surface
D. hot working
E. using gradual changes of section